/* roulang page: index */
:root {
            --color-brand: #2E6BE6;
            --color-brand-hover: #1D54C4;
            --color-brand-soft: #EDF3FD;
            --color-accent: #FF7A45;
            --color-accent-hover: #F26626;
            --color-deep: #14284D;
            --color-ink: #1B2A41;
            --color-text: #44566C;
            --color-muted: #8FA1B8;
            --color-bg: #F4F7FC;
            --color-surface: #FFFFFF;
            --color-border: #DCE5F0;
            --radius-lg: 16px;
            --radius-md: 12px;
            --shadow-sm: 0 1px 3px rgba(20,40,77,.06), 0 4px 14px rgba(20,40,77,.04);
            --shadow-hover: 0 8px 30px rgba(20,40,77,.12);
            --gap-section: 100px;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        :focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
        }

        .site-container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: var(--gap-section) 0;
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
        }

        .section-title {
            font-size: clamp(24px, 3vw, 30px);
            font-weight: 800;
            color: var(--color-ink);
            line-height: 1.3;
            margin: 0 0 6px;
        }

        .section-sub {
            font-size: 13px;
            letter-spacing: .12em;
            text-transform: uppercase;
            color: var(--color-muted);
            margin-bottom: 32px;
            font-weight: 600;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            position: relative;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-brand), #1B3B7B);
            position: relative;
            flex-shrink: 0;
        }

        .logo-icon::after {
            content: '';
            position: absolute;
            right: 2px;
            top: 2px;
            width: 11px;
            height: 11px;
            background: var(--color-accent);
            border-radius: 50%;
            border: 2px solid #fff;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--color-ink);
            letter-spacing: .01em;
        }

        .logo-text span {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            margin-left: 3px;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 26px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            padding: 10px 0;
            position: relative;
            display: inline-block;
            transition: color .2s ease;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            transform: translateX(-50%) scaleX(0);
            width: 16px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 999px;
            transition: transform .2s ease;
        }

        .nav-link:hover {
            color: var(--color-brand);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            transform: translateX(-50%) scaleX(1);
        }

        .nav-link.active {
            color: var(--color-deep);
            font-weight: 700;
        }

        .nav-cta {
            margin-left: 8px;
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 5px;
            transition: background .2s;
        }

        .nav-toggle:hover {
            background: var(--color-brand-soft);
        }

        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform .3s, opacity .3s;
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        @media (max-width: 900px) {
            .nav-list {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                align-items: flex-start;
                gap: 0;
                padding: 8px 24px 16px;
                border-bottom: 1px solid var(--color-border);
                box-shadow: 0 12px 32px rgba(20, 40, 77, .08);
                display: none;
                animation: navFade .25s ease;
            }

            .nav-list.open {
                display: flex;
            }

            .nav-link {
                width: 100%;
                padding: 16px 12px;
                font-size: 16px;
                border-radius: 10px;
            }

            .nav-link:hover {
                background: var(--color-brand-soft);
            }

            .nav-link::after {
                display: none;
            }

            .nav-cta {
                margin-left: 0;
                margin-top: 12px;
                width: 100%;
            }

            .nav-cta .btn {
                width: 100%;
            }

            .nav-toggle {
                display: flex;
            }
        }

        @keyframes navFade {
            from {
                opacity: 0;
                transform: translateY(-8px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 26px;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 700;
            line-height: 1.2;
            border: 1.5px solid transparent;
            transition: all .25s ease;
            text-align: center;
            white-space: nowrap;
        }

        .btn-sm {
            padding: 10px 18px;
            font-size: 14px;
        }

        .btn-primary {
            background: var(--color-brand);
            color: #fff;
            box-shadow: 0 4px 12px rgba(46, 107, 230, .22);
        }

        .btn-primary:hover {
            background: var(--color-brand-hover);
            box-shadow: 0 6px 20px rgba(46, 107, 230, .32);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: #fff;
            color: var(--color-brand);
            border-color: var(--color-brand);
        }

        .btn-outline:hover {
            background: var(--color-brand-soft);
            transform: translateY(-2px);
        }

        .btn-accent {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(255, 122, 69, .28);
        }

        .btn-accent:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 6px 22px rgba(255, 122, 69, .36);
            transform: translateY(-2px);
        }

        .btn-white {
            background: #fff;
            color: var(--color-accent);
        }

        .btn-white:hover {
            background: #FFF4EE;
            transform: translateY(-2px);
        }

        .btn-ghost-white {
            background: rgba(255, 255, 255, .16);
            color: #fff;
            border-color: rgba(255, 255, 255, .65);
        }

        .btn-ghost-white:hover {
            background: rgba(255, 255, 255, .3);
            transform: translateY(-2px);
        }

        .btn:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            overflow: hidden;
            background:
                linear-gradient(120deg, #EAF1FE 0%, #FFFFFF 42%, rgba(255, 255, 255, 0) 92%),
                url('/assets/images/backpic/back-1.png') no-repeat center/cover;
            min-height: 520px;
            display: flex;
            align-items: center;
        }

        .hero-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
            width: 100%;
        }

        .hero-content {
            max-width: 620px;
            padding: 88px 0;
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: clamp(30px, 4.2vw, 44px);
            font-weight: 900;
            color: var(--color-ink);
            line-height: 1.22;
            margin: 0 0 20px;
        }

        .hero-sub {
            font-size: 17px;
            color: var(--color-text);
            line-height: 1.8;
            margin: 0 0 36px;
            max-width: 480px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .hero-visual {
            position: relative;
            width: 340px;
            height: 420px;
            flex-shrink: 0;
        }

        .hero-card {
            position: absolute;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 18px 44px rgba(20, 40, 77, .16);
        }

        .hero-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .hero-card-1 {
            width: 245px;
            height: 340px;
            right: 90px;
            top: 12px;
            transform: rotate(4deg);
            z-index: 2;
        }

        .hero-card-2 {
            width: 190px;
            height: 260px;
            right: 10px;
            bottom: 6px;
            transform: rotate(-6deg);
            z-index: 3;
            box-shadow: 0 22px 48px rgba(20, 40, 77, .2);
        }

        @media (max-width: 1024px) {
            .hero-visual {
                width: 280px;
                height: 360px;
            }

            .hero-card-1 {
                width: 210px;
                height: 290px;
                right: 60px;
            }

            .hero-card-2 {
                width: 150px;
                height: 210px;
                right: 0;
            }
        }

        @media (max-width: 768px) {
            .hero {
                min-height: auto;
            }

            .hero-inner {
                flex-direction: column;
                gap: 0;
            }

            .hero-content {
                max-width: 100%;
                padding: 64px 0 40px;
                text-align: center;
            }

            .hero-sub {
                margin-left: auto;
                margin-right: auto;
            }

            .hero-actions {
                justify-content: center;
            }

            .hero-visual {
                display: none;
            }
        }

        /* ===== 合集卡片 ===== */
        .collection-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .collection-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: box-shadow .25s ease, transform .25s ease;
            display: flex;
            flex-direction: column;
        }

        .collection-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .collection-cover {
            height: 210px;
            overflow: hidden;
        }

        .collection-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .collection-card:hover .collection-cover img {
            transform: scale(1.04);
        }

        .collection-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .collection-title {
            font-size: 19px;
            font-weight: 800;
            color: var(--color-ink);
            margin: 0 0 10px;
        }

        .collection-desc {
            font-size: 14px;
            color: var(--color-text);
            line-height: 1.7;
            margin: 0 0 18px;
            flex: 1;
        }

        .collection-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .collection-count {
            font-size: 12px;
            font-weight: 600;
            background: var(--color-brand-soft);
            color: var(--color-brand);
            padding: 4px 12px;
            border-radius: 999px;
        }

        .collection-link {
            font-size: 14px;
            font-weight: 700;
            color: var(--color-brand);
            transition: color .2s;
        }

        .collection-link:hover {
            color: var(--color-brand-hover);
        }

        @media (max-width: 768px) {
            .collection-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 精选条目 ===== */
        .featured-wrap {
            background: var(--color-brand-soft);
            border-radius: 24px;
            padding: 32px;
        }

        .featured-list {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .featured-item {
            position: relative;
            display: flex;
            align-items: center;
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: 16px;
            padding: 16px;
            box-shadow: var(--shadow-sm);
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .featured-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .featured-img {
            width: 120px;
            height: 84px;
            border-radius: 12px;
            object-fit: cover;
            flex-shrink: 0;
        }

        .featured-content {
            flex: 1;
            min-width: 0;
            padding: 0 20px;
        }

        .featured-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-ink);
            margin: 0 0 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .featured-summary {
            font-size: 13px;
            color: var(--color-muted);
            margin: 0 0 8px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .featured-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 12px;
            color: var(--color-muted);
        }

        .featured-arrow {
            font-size: 20px;
            color: var(--color-brand);
            font-weight: 700;
            flex-shrink: 0;
            padding: 0 8px;
        }

        .featured-badge {
            position: absolute;
            top: -8px;
            left: -8px;
            background: var(--color-accent);
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            padding: 3px 12px;
            border-radius: 999px;
            box-shadow: 0 4px 10px rgba(255, 122, 69, .3);
        }

        @media (max-width: 640px) {
            .featured-wrap {
                padding: 20px;
            }

            .featured-item {
                flex-wrap: wrap;
            }

            .featured-content {
                width: 100%;
                padding: 12px 0 0;
            }

            .featured-img {
                width: 100%;
                height: 160px;
            }

            .featured-title,
            .featured-summary {
                white-space: normal;
            }

            .featured-arrow {
                display: none;
            }
        }

        /* ===== 标签 ===== */
        .pill {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 700;
            line-height: 1.4;
            white-space: nowrap;
        }

        .pill-brand {
            background: var(--color-brand-soft);
            color: var(--color-brand);
        }

        .pill-muted {
            background: #EDF1F6;
            color: var(--color-muted);
        }

        /* ===== 最新资讯列表 ===== */
        .news-panel {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .news-item {
            display: flex;
            align-items: center;
            gap: 18px;
            padding: 18px 24px;
            border-bottom: 1px solid var(--color-border);
            transition: background .2s ease;
        }

        .news-item:last-child {
            border-bottom: none;
        }

        .news-item:hover {
            background: var(--color-brand-soft);
        }

        .news-title {
            flex: 1;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-ink);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-summary {
            flex: 1.4;
            font-size: 13px;
            color: var(--color-muted);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-meta {
            font-size: 13px;
            color: var(--color-muted);
            white-space: nowrap;
        }

        .news-arrow {
            color: var(--color-brand);
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .empty-state {
            padding: 56px 24px;
            text-align: center;
            color: var(--color-muted);
            font-size: 15px;
            background: #fff;
            border-radius: 20px;
            border: 1px solid var(--color-border);
        }

        @media (max-width: 640px) {
            .news-item {
                flex-wrap: wrap;
                padding: 16px;
                gap: 10px;
            }

            .news-summary {
                flex-basis: 100%;
                order: 3;
                white-space: normal;
            }

            .news-title {
                flex-basis: calc(100% - 40px);
                white-space: normal;
            }

            .news-meta {
                order: 4;
            }
        }

        /* ===== 相关推荐 ===== */
        .recommend-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .recommend-card {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .recommend-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .recommend-cover {
            position: relative;
            height: 140px;
            overflow: hidden;
        }

        .recommend-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .recommend-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(255, 255, 255, .92);
            color: var(--color-muted);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 999px;
        }

        .recommend-body {
            padding: 16px;
        }

        .recommend-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--color-ink);
            margin: 0;
        }

        @media (max-width: 1024px) {
            .recommend-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .recommend-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(120deg, #FF7A45, #FF9B70);
            position: relative;
            overflow: hidden;
        }

        .cta-inner {
            padding: 72px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 36px;
            flex-wrap: wrap;
        }

        .cta-text h2 {
            color: #fff;
            font-size: clamp(22px, 3vw, 30px);
            font-weight: 800;
            margin: 0 0 10px;
            line-height: 1.3;
        }

        .cta-text p {
            color: rgba(255, 255, 255, .94);
            font-size: 15px;
            margin: 0;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        @media (max-width: 768px) {
            .cta-inner {
                padding: 56px 0;
                text-align: center;
                justify-content: center;
            }

            .cta-actions {
                justify-content: center;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--color-border);
            border-radius: 14px;
            margin-bottom: 16px;
            overflow: hidden;
            transition: border-color .25s, box-shadow .25s;
        }

        .faq-item.open {
            border-color: var(--color-brand);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 20px;
            background: none;
            text-align: left;
        }

        .faq-q-mark {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: var(--color-brand-soft);
            color: var(--color-brand);
            font-weight: 800;
            font-size: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .faq-question-text {
            flex: 1;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
        }

        .faq-icon {
            position: relative;
            width: 16px;
            height: 16px;
            flex-shrink: 0;
        }

        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            background: var(--color-brand);
            border-radius: 2px;
            transition: transform .25s ease, opacity .25s ease;
        }

        .faq-icon::before {
            top: 50%;
            left: 0;
            width: 100%;
            height: 2px;
            transform: translateY(-50%);
        }

        .faq-icon::after {
            left: 50%;
            top: 0;
            height: 100%;
            width: 2px;
            transform: translateX(-50%);
        }

        .faq-item.open .faq-icon::after {
            transform: translateX(-50%) rotate(90deg);
            opacity: 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 20px;
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text);
            transition: max-height .35s ease, padding .35s ease;
        }

        .faq-item.open .faq-answer {
            max-height: 600px;
            padding-bottom: 20px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--color-deep);
            color: #A9BBD0;
            padding: 72px 0 32px;
            margin-top: 80px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 48px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-logo .logo-text {
            color: #fff;
        }

        .footer-logo .logo-text span {
            color: #A9BBD0;
        }

        .footer-desc {
            font-size: 13px;
            line-height: 1.8;
            color: #A9BBD0;
            margin-top: 16px;
            max-width: 300px;
        }

        .footer-title {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 18px;
            letter-spacing: .04em;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links a {
            color: #A9BBD0;
            font-size: 14px;
            transition: color .2s;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .subscribe-form {
            display: flex;
            margin-top: 16px;
            max-width: 360px;
        }

        .subscribe-form input {
            flex: 1;
            min-width: 0;
            padding: 12px 16px;
            border-radius: 12px 0 0 12px;
            border: 1px solid rgba(255, 255, 255, .16);
            border-right: none;
            background: rgba(255, 255, 255, .1);
            color: #fff;
            font-size: 14px;
            outline: none;
            transition: background .2s, border-color .2s;
        }

        .subscribe-form input::placeholder {
            color: rgba(255, 255, 255, .55);
        }

        .subscribe-form input:focus {
            background: rgba(255, 255, 255, .16);
            border-color: rgba(255, 255, 255, .35);
        }

        .subscribe-form button {
            border-radius: 0 12px 12px 0;
            background: var(--color-accent);
            color: #fff;
            padding: 0 22px;
            font-weight: 700;
            font-size: 14px;
            transition: background .2s;
        }

        .subscribe-form button:hover {
            background: var(--color-accent-hover);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            margin-top: 56px;
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: #7F92A8;
        }

        .footer-bottom a {
            color: #A9BBD0;
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }
        }

        @media (max-width: 640px) {
            .site-footer {
                padding: 56px 0 24px;
                margin-top: 56px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .footer-bottom {
                margin-top: 40px;
            }
        }

        /* ===== Toast ===== */
        .toast {
            position: fixed;
            bottom: 32px;
            left: 50%;
            transform: translate(-50%, 20px);
            background: var(--color-deep);
            color: #fff;
            padding: 13px 26px;
            border-radius: 12px;
            box-shadow: 0 12px 32px rgba(20, 40, 77, .22);
            font-size: 14px;
            font-weight: 600;
            opacity: 0;
            visibility: hidden;
            transition: opacity .3s, transform .3s, visibility .3s;
            z-index: 999;
            white-space: nowrap;
        }

        .toast.show {
            opacity: 1;
            visibility: visible;
            transform: translate(-50%, 0);
        }

/* roulang page: category1 */
:root {
            --color-brand: #2E6BE6;
            --color-brand-hover: #1D54C4;
            --color-brand-soft: #EDF3FD;
            --color-accent: #FF7A45;
            --color-accent-hover: #F26626;
            --color-deep: #14284D;
            --color-ink: #1B2A41;
            --color-text: #44566C;
            --color-muted: #8FA1B8;
            --color-bg: #F4F7FC;
            --color-surface: #FFFFFF;
            --color-border: #DCE5F0;
            --radius-lg: 16px;
            --radius-sm: 10px;
            --shadow-card: 0 1px 3px rgba(20,40,77,.06), 0 4px 14px rgba(20,40,77,.04);
            --shadow-hover: 0 8px 30px rgba(20,40,77,.12);
            --font-main: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
            outline: none;
        }

        ul,
        ol {
            list-style: none;
        }

        .site-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== 导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 24px;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-brand) 0%, #4A8DF0 80%);
            position: relative;
            flex-shrink: 0;
        }

        .logo-icon::after {
            content: '';
            position: absolute;
            right: -2px;
            bottom: -2px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--color-accent);
            border: 2px solid #fff;
        }

        .logo-text {
            font-size: 22px;
            font-weight: 800;
            color: var(--color-ink);
            letter-spacing: .5px;
            white-space: nowrap;
        }

        .logo-text span {
            color: var(--color-muted);
            font-weight: 600;
            font-size: 15px;
            margin-left: 2px;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-link {
            display: inline-block;
            padding: 10px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            border-radius: var(--radius-sm);
            position: relative;
            transition: color .2s ease;
        }

        .nav-link:hover {
            color: var(--color-brand);
        }

        .nav-link.active {
            color: var(--color-ink);
            font-weight: 700;
        }

        .nav-link.active::before {
            content: '';
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 6px;
            vertical-align: middle;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            padding: 10px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            background: transparent;
            transition: background .2s;
        }

        .nav-toggle:hover {
            background: var(--color-brand-soft);
        }

        .nav-toggle span {
            display: block;
            height: 2px;
            border-radius: 2px;
            background: var(--color-ink);
            transition: transform .25s ease, opacity .25s ease;
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== 按钮 ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.4;
            cursor: pointer;
            transition: background-color .25s ease, box-shadow .25s ease, transform .2s ease, border-color .2s ease;
            border: 1.5px solid transparent;
            text-decoration: none;
        }

        .btn:focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--color-brand);
            color: #fff;
            box-shadow: 0 2px 8px rgba(46, 107, 230, .28);
        }

        .btn-primary:hover {
            background: var(--color-brand-hover);
            box-shadow: 0 4px 16px rgba(46, 107, 230, .35);
        }

        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 1px 4px rgba(46, 107, 230, .3);
        }

        .btn-sm {
            padding: 9px 18px;
            font-size: 14px;
        }

        .btn-accent {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 2px 8px rgba(255, 122, 69, .28);
        }

        .btn-accent:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 4px 16px rgba(255, 122, 69, .35);
        }

        .btn-outline-accent {
            background: transparent;
            border: 1.5px solid var(--color-accent);
            color: var(--color-accent);
        }

        .btn-outline-accent:hover {
            background: rgba(255, 122, 69, .08);
        }

        /* ========== 标签 ========== */
        .tag {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: var(--color-brand-soft);
            color: var(--color-brand);
        }

        .tag-hot {
            background: var(--color-accent);
            color: #fff;
        }

        .tag-muted {
            background: #EAF0F7;
            color: var(--color-muted);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 3px 10px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            background: rgba(255, 122, 69, .12);
            color: var(--color-accent-hover);
        }

        /* ========== 分类页头 ========== */
        .category-hero {
            background: linear-gradient(135deg, #EAF1FE 0%, #F7FAFF 60%, #FFFFFF 100%);
            border-bottom: 1px solid var(--color-border);
            padding: 56px 0 48px;
            position: relative;
        }

        .category-hero-inner {
            max-width: 900px;
        }

        .category-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            border-radius: 999px;
            background: rgba(255, 122, 69, .1);
            color: var(--color-accent-hover);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .category-hero-badge::before {
            content: '';
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-accent);
        }

        .category-hero h1 {
            font-size: 38px;
            font-weight: 800;
            color: var(--color-ink);
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: .5px;
        }

        .category-hero p {
            font-size: 18px;
            color: var(--color-text);
            max-width: 740px;
            line-height: 1.7;
        }

        .category-hero-meta {
            display: flex;
            gap: 12px;
            margin-top: 24px;
            flex-wrap: wrap;
        }

        /* ========== 章节标题 ========== */
        .section-head {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-subtitle {
            font-size: 12px;
            letter-spacing: 3px;
            text-transform: uppercase;
            color: var(--color-muted);
            font-weight: 600;
            display: block;
            margin-bottom: 8px;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--color-ink);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .section-head p {
            color: var(--color-muted);
            font-size: 15px;
        }

        /* ========== 合集目录 ========== */
        .collections-section {
            padding: 80px 0 64px;
        }

        .magazine-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .magazine-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            border: 1px solid var(--color-border);
            transition: box-shadow .25s ease, transform .25s ease;
            display: flex;
            flex-direction: column;
            cursor: pointer;
        }

        .magazine-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .magazine-card.featured {
            grid-column: 1 / -1;
            flex-direction: row;
        }

        .magazine-card.featured .magazine-cover {
            width: 56%;
            min-height: 280px;
            flex-shrink: 0;
        }

        .magazine-cover {
            position: relative;
            overflow: hidden;
            background: var(--color-brand-soft);
        }

        .magazine-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s ease;
        }

        .magazine-card:hover .magazine-cover img {
            transform: scale(1.03);
        }

        .magazine-cover .tag {
            position: absolute;
            top: 14px;
            left: 14px;
            z-index: 2;
            box-shadow: 0 2px 8px rgba(0, 0, 0, .1);
        }

        .magazine-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .magazine-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .magazine-body p {
            color: var(--color-muted);
            font-size: 14px;
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }

        .magazine-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
            flex-wrap: wrap;
        }

        .link-arrow {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            color: var(--color-brand);
            font-weight: 600;
            font-size: 14px;
            transition: gap .2s ease;
        }

        .link-arrow:hover {
            gap: 8px;
        }

        /* ========== 精选条目 ========== */
        .featured-section {
            padding: 64px 0;
            background: var(--color-brand-soft);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        .featured-list {
            max-width: 960px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .featured-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 16px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--color-border);
            cursor: pointer;
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .featured-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .featured-thumb {
            width: 120px;
            height: 84px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--color-brand-soft);
        }

        .featured-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .featured-content {
            flex: 1;
            min-width: 0;
        }

        .featured-content h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            line-height: 1.4;
        }

        .featured-content p {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.5;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .featured-right {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .featured-arrow {
            color: var(--color-brand);
            font-size: 18px;
            font-weight: 700;
            transition: transform .2s ease;
        }

        .featured-item:hover .featured-arrow {
            transform: translateX(4px);
        }

        .featured-tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 999px;
            background: var(--color-brand-soft);
            color: var(--color-brand);
            font-size: 12px;
            font-weight: 600;
            white-space: nowrap;
        }

        .featured-tag.hot {
            background: var(--color-accent);
            color: #fff;
        }

        /* ========== 亮点区 ========== */
        .highlights-section {
            padding: 80px 0;
        }

        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .highlight-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .highlight-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .highlight-icon {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--color-brand-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            position: relative;
        }

        .highlight-icon::after {
            content: '';
            width: 22px;
            height: 22px;
            border-radius: 6px;
            background: var(--color-brand);
            opacity: .8;
            transform: rotate(45deg) scale(.6);
        }

        .highlight-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 10px;
        }

        .highlight-card p {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
        }

        /* ========== 流程区 ========== */
        .steps-section {
            padding: 80px 0;
            background: var(--color-deep);
            color: #fff;
        }

        .steps-section .section-head h2 {
            color: #fff;
        }

        .steps-section .section-head p {
            color: rgba(255, 255, 255, .7);
        }

        .steps-section .section-subtitle {
            color: rgba(255, 255, 255, .6);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 16px;
        }

        .step-item {
            position: relative;
            padding: 32px 20px;
            background: rgba(255, 255, 255, .06);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255, 255, 255, .1);
            text-align: center;
            transition: background .25s ease;
        }

        .step-item:hover {
            background: rgba(255, 255, 255, .1);
        }

        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--color-accent);
            color: #fff;
            font-weight: 800;
            font-size: 18px;
            margin-bottom: 14px;
        }

        .step-item h3 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 6px;
        }

        .step-item p {
            font-size: 13px;
            color: rgba(255, 255, 255, .65);
            line-height: 1.5;
        }

        /* ========== CTA区 ========== */
        .cta-return {
            padding: 80px 0;
        }

        .cta-return-card {
            max-width: 860px;
            margin: 0 auto;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 48px;
            text-align: center;
        }

        .cta-return-card h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--color-ink);
            margin-bottom: 16px;
        }

        .cta-return-card p {
            color: var(--color-muted);
            font-size: 15px;
            margin-bottom: 28px;
        }

        .cta-return-card .btn {
            font-size: 16px;
            padding: 14px 36px;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--color-deep);
            color: rgba(255, 255, 255, .7);
            padding: 80px 0 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            margin-bottom: 56px;
        }

        .footer-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .footer-logo .logo-icon {
            background: linear-gradient(135deg, #3A78E8 0%, #5B9DF8 80%);
        }

        .footer-logo .logo-text {
            color: #fff;
        }

        .footer-logo .logo-text span {
            color: rgba(255, 255, 255, .55);
        }

        .footer-desc {
            font-size: 14px;
            color: rgba(255, 255, 255, .6);
            line-height: 1.7;
            margin-bottom: 16px;
            max-width: 320px;
        }

        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            font-size: 14px;
            color: rgba(255, 255, 255, .65);
            transition: color .2s ease;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .subscribe-form {
            display: flex;
            gap: 8px;
            margin-top: 8px;
        }

        .subscribe-form input {
            flex: 1;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .15);
            color: #fff;
            font-size: 14px;
            transition: border-color .2s ease;
        }

        .subscribe-form input::placeholder {
            color: rgba(255, 255, 255, .4);
        }

        .subscribe-form input:focus {
            border-color: var(--color-accent);
        }

        .subscribe-form button {
            padding: 10px 18px;
            background: var(--color-accent);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: background .2s ease;
            white-space: nowrap;
        }

        .subscribe-form button:hover {
            background: var(--color-accent-hover);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .12);
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255, 255, 255, .45);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .highlights-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                height: 64px;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-list {
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: stretch;
                padding: 8px 24px 20px;
                gap: 4px;
                border-bottom: 1px solid var(--color-border);
                box-shadow: 0 12px 24px rgba(20, 40, 77, .08);
                display: none;
                max-height: calc(100vh - 64px);
                overflow-y: auto;
            }

            .nav-list.open {
                display: flex;
                animation: navSlideIn .25s ease;
            }

            @keyframes navSlideIn {
                from {
                    opacity: 0;
                    transform: translateY(-8px);
                }
                to {
                    opacity: 1;
                    transform: translateY(0);
                }
            }

            .nav-link {
                padding: 14px 12px;
                font-size: 16px;
                border-radius: var(--radius-sm);
            }

            .nav-link:hover {
                background: var(--color-brand-soft);
            }

            .nav-link.active {
                background: var(--color-brand-soft);
            }

            .nav-cta {
                margin-top: 8px;
            }

            .logo-text {
                font-size: 19px;
            }

            .category-hero {
                padding: 40px 0 36px;
            }

            .category-hero h1 {
                font-size: 28px;
            }

            .category-hero p {
                font-size: 15px;
            }

            .magazine-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .magazine-card.featured {
                flex-direction: column;
            }

            .magazine-card.featured .magazine-cover {
                width: 100%;
                min-height: 180px;
            }

            .featured-item {
                flex-direction: row;
                gap: 14px;
                padding: 12px;
            }

            .featured-thumb {
                width: 84px;
                height: 64px;
            }

            .featured-content h3 {
                font-size: 14px;
                white-space: normal;
                display: -webkit-box;
                -webkit-line-clamp: 2;
                -webkit-box-orient: vertical;
                overflow: hidden;
            }

            .featured-content p {
                white-space: normal;
                display: -webkit-box;
                -webkit-line-clamp: 1;
                -webkit-box-orient: vertical;
                overflow: hidden;
            }

            .featured-right .featured-tag {
                display: none;
            }

            .highlights-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .collections-section {
                padding: 48px 0 40px;
            }

            .cta-return-card {
                padding: 32px 20px;
            }

            .cta-return-card h2 {
                font-size: 20px;
            }

            .site-header .site-container {
                padding: 0 16px;
            }

            .site-container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 24px;
            }

            .category-hero-badge {
                font-size: 12px;
                padding: 5px 10px;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .magazine-body {
                padding: 18px;
            }

            .magazine-body h3 {
                font-size: 17px;
            }

            .highlights-grid {
                grid-template-columns: 1fr;
            }

            .steps-grid {
                grid-template-columns: 1fr;
            }

            .btn {
                padding: 10px 18px;
                font-size: 14px;
            }

            .subscribe-form {
                flex-direction: column;
            }

            .subscribe-form button {
                width: 100%;
            }

            .footer-bottom {
                font-size: 12px;
            }
        }

        /* 焦点可见性 */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
        }

        .btn:disabled,
        .btn[aria-disabled="true"] {
            opacity: .5;
            pointer-events: none;
        }

/* roulang page: article */
:root {
            --color-brand: #2E6BE6;
            --color-brand-hover: #1D54C4;
            --color-brand-soft: #EDF3FD;
            --color-accent: #FF7A45;
            --color-accent-hover: #F26626;
            --color-deep: #14284D;
            --color-ink: #1B2A41;
            --color-text: #44566C;
            --color-muted: #8FA1B8;
            --color-bg: #F4F7FC;
            --color-surface: #FFFFFF;
            --color-border: #DCE5F0;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-full: 999px;
            --shadow-card: 0 1px 3px rgba(20,40,77,.06), 0 4px 14px rgba(20,40,77,.04);
            --shadow-hover: 0 8px 30px rgba(20,40,77,.12);
            --font-stack: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-stack);
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 15px;
            min-height: 100vh;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button {
            font-family: inherit;
            cursor: pointer;
        }

        input, textarea, select {
            font-family: inherit;
        }

        ul, ol {
            padding: 0;
            margin: 0;
            list-style: none;
        }

        .site-container {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        @media (max-width: 640px) {
            .site-container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            position: relative;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--color-brand), #5B93FF);
            position: relative;
            box-shadow: 0 4px 14px rgba(46, 107, 230, .35);
            flex-shrink: 0;
        }

        .logo-icon::after {
            content: '';
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 0;
            height: 0;
            border-left: 8px solid #fff;
            border-top: 5px solid transparent;
            border-bottom: 5px solid transparent;
            border-radius: 2px;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-ink);
            letter-spacing: .01em;
            white-space: nowrap;
        }

        .logo-text span {
            font-weight: 400;
            color: var(--color-muted);
            font-size: 14px;
            margin-left: 2px;
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border: none;
            background: transparent;
            padding: 10px;
            cursor: pointer;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            border-radius: 10px;
            transition: background .2s ease;
        }

        .nav-toggle:hover {
            background: var(--color-brand-soft);
        }

        .nav-toggle span {
            height: 2px;
            width: 22px;
            background: var(--color-ink);
            border-radius: 4px;
            transition: all .3s ease;
            display: block;
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
            margin: 0;
            padding: 0;
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            text-decoration: none;
            padding: 8px 2px;
            transition: color .2s ease;
            white-space: nowrap;
            outline: none;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            left: 50%;
            bottom: 0;
            width: 0;
            height: 3px;
            border-radius: 3px;
            background: var(--color-accent);
            transform: translateX(-50%);
            transition: width .3s ease;
        }

        .nav-link:hover,
        .nav-link:focus-visible {
            color: var(--color-brand);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            width: 18px;
        }

        .nav-link.active {
            color: var(--color-brand);
            font-weight: 700;
        }

        .nav-link:focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .nav-cta {
            display: flex;
            align-items: center;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            line-height: 1.2;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            border: none;
            cursor: pointer;
            text-decoration: none;
            transition: all .25s ease;
            box-shadow: 0 2px 8px rgba(20, 40, 77, .06);
            outline: none;
        }

        .btn:focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--color-brand);
            color: #fff;
            box-shadow: 0 4px 14px rgba(46, 107, 230, .3);
        }

        .btn-primary:hover {
            background: var(--color-brand-hover);
            box-shadow: 0 6px 20px rgba(46, 107, 230, .4);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(46, 107, 230, .3);
        }

        .btn-ghost {
            background: var(--color-surface);
            color: var(--color-brand);
            border: 1.5px solid var(--color-brand);
        }

        .btn-ghost:hover {
            background: var(--color-brand-soft);
            color: var(--color-brand);
        }

        .btn-accent {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(255, 122, 69, .3);
        }

        .btn-accent:hover {
            background: var(--color-accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 122, 69, .35);
        }

        .btn-sm {
            padding: 9px 18px;
            font-size: 13px;
            border-radius: 8px;
        }

        .btn-ghost-white {
            background: transparent;
            border: 1.5px solid rgba(255, 255, 255, .55);
            color: #fff;
        }

        .btn-ghost-white:hover {
            background: rgba(255, 255, 255, .12);
            color: #fff;
            box-shadow: none;
        }

        /* -------- 文章页头部 -------- */
        .article-header {
            background:
                linear-gradient(115deg, rgba(234, 241, 254, .96) 0%, rgba(255, 255, 255, .9) 48%, rgba(255, 255, 255, .1) 100%),
                url('/assets/images/backpic/back-1.png') no-repeat right center;
            background-size: cover;
            padding: 56px 0 40px;
            border-bottom: 1px solid var(--color-border);
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            margin-bottom: 20px;
            color: var(--color-muted);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-text);
            text-decoration: none;
            transition: color .2s ease;
            outline: none;
        }

        .breadcrumb a:hover,
        .breadcrumb a:focus-visible {
            color: var(--color-brand);
        }

        .breadcrumb .sep {
            color: var(--color-border);
            font-size: 12px;
        }

        .breadcrumb .current {
            color: var(--color-muted);
            max-width: 300px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .article-title {
            font-size: 34px;
            line-height: 1.35;
            font-weight: 800;
            color: var(--color-ink);
            margin: 0 0 16px;
            letter-spacing: -0.01em;
            max-width: 800px;
            word-break: break-word;
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--color-muted);
        }

        .category-pill {
            display: inline-flex;
            align-items: center;
            background: var(--color-brand);
            color: #fff;
            border-radius: var(--radius-full);
            padding: 5px 14px;
            font-size: 12px;
            font-weight: 600;
        }

        .meta-date,
        .meta-read,
        .meta-author {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .meta-author {
            color: var(--color-brand);
            font-weight: 500;
        }

        /* -------- 文章主体卡片 -------- */
        .article-main {
            padding: 48px 0 24px;
        }

        .article-card {
            max-width: 860px;
            margin: 0 auto;
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--color-border);
        }

        .article-content {
            font-size: 16px;
            line-height: 1.8;
            color: var(--color-text);
            word-wrap: break-word;
        }

        .article-content p {
            margin-bottom: 1.2em;
        }

        .article-content h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-ink);
            margin: 40px 0 16px;
            padding-left: 14px;
            border-left: 4px solid var(--color-brand);
            line-height: 1.4;
        }

        .article-content h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--color-ink);
            margin: 28px 0 12px;
        }

        .article-content h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-ink);
            margin: 22px 0 10px;
        }

        .article-content ul {
            margin: 12px 0 16px;
            padding-left: 24px;
            list-style: disc;
        }

        .article-content ul li {
            margin: 6px 0;
        }

        .article-content ol {
            margin: 12px 0 16px;
            padding-left: 24px;
            list-style: decimal;
        }

        .article-content ol li {
            margin: 6px 0;
        }

        .article-content img {
            width: 100%;
            height: auto;
            margin: 24px auto;
            border-radius: 12px;
            box-shadow: var(--shadow-card);
            display: block;
        }

        .article-content blockquote {
            margin: 24px 0;
            padding: 16px 20px;
            background: var(--color-brand-soft);
            border-left: 4px solid var(--color-brand);
            border-radius: 8px;
            color: var(--color-ink);
            font-style: normal;
        }

        .article-content blockquote p {
            margin-bottom: 0;
        }

        .article-content a {
            color: var(--color-brand);
            text-decoration: underline;
            text-underline-offset: 4px;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 14px;
            overflow-x: auto;
            display: table;
        }

        .article-content th {
            background: var(--color-bg);
            color: var(--color-ink);
            font-weight: 600;
            padding: 12px 14px;
            border: 1px solid var(--color-border);
            text-align: left;
        }

        .article-content td {
            padding: 10px 14px;
            border: 1px solid var(--color-border);
            color: var(--color-text);
        }

        .article-content hr {
            border: none;
            border-top: 1px solid var(--color-border);
            margin: 28px 0;
        }

        /* -------- 文末标签与分享 -------- */
        .article-extras {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }

        .share-tags {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-muted);
        }

        .tag-label {
            font-weight: 500;
        }

        .tag-pill {
            display: inline-block;
            background: var(--color-brand-soft);
            color: var(--color-brand);
            border-radius: var(--radius-full);
            padding: 5px 14px;
            font-size: 12px;
            font-weight: 500;
        }

        .share-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .share-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 16px;
            border-radius: var(--radius-full);
            border: 1px solid var(--color-border);
            background: var(--color-surface);
            color: var(--color-text);
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            transition: all .25s ease;
            outline: none;
        }

        .share-btn svg {
            width: 16px;
            height: 16px;
        }

        .share-btn:hover {
            border-color: var(--color-brand);
            color: var(--color-brand);
            background: var(--color-brand-soft);
            transform: translateY(-1px);
        }

        .share-btn:focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
        }

        .share-btn:active {
            transform: translateY(0);
        }

        /* -------- 缺失内容状态 -------- */
        .content-missing {
            text-align: center;
            padding: 70px 20px;
            background: var(--color-bg);
            border-radius: 16px;
            border: 1px dashed var(--color-border);
        }

        .missing-icon {
            width: 68px;
            height: 68px;
            border-radius: 50%;
            background: var(--color-brand-soft);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }

        .missing-icon svg {
            width: 32px;
            height: 32px;
            stroke: var(--color-brand);
            fill: none;
            stroke-width: 1.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .content-missing h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 8px;
        }

        .content-missing p {
            color: var(--color-muted);
            font-size: 14px;
            margin-bottom: 24px;
        }

        /* -------- 相关推荐 -------- */
        .related-section {
            padding: 56px 0 16px;
        }

        .related-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 28px;
        }

        .related-head h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-ink);
        }

        .related-more {
            font-size: 14px;
            color: var(--color-brand);
            font-weight: 500;
            transition: color .2s;
        }

        .related-more:hover {
            color: var(--color-brand-hover);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            text-decoration: none;
            transition: transform .25s ease, box-shadow .25s ease;
            border: 1px solid var(--color-border);
            display: block;
            position: relative;
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .related-card:focus-visible {
            outline: 2px solid var(--color-brand);
            outline-offset: 2px;
            border-radius: var(--radius-lg);
        }

        .related-img {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--color-bg);
        }

        .related-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform .4s ease;
        }

        .related-card:hover .related-img img {
            transform: scale(1.03);
        }

        .related-body {
            padding: 20px 22px 24px;
        }

        .related-badge {
            display: inline-block;
            background: var(--color-brand-soft);
            color: var(--color-brand);
            font-size: 11px;
            font-weight: 600;
            border-radius: var(--radius-full);
            padding: 4px 10px;
            margin-bottom: 10px;
        }

        .related-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .related-body p {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
            margin: 0;
        }

        /* --------- CTA --------- */
        .article-cta {
            padding: 48px 0 72px;
        }

        .cta-inner {
            background: var(--color-deep);
            border-radius: 20px;
            padding: 52px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .cta-inner::before {
            content: '';
            position: absolute;
            right: -60px;
            top: -60px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(255, 122, 69, .25);
            filter: blur(10px);
        }

        .cta-inner::after {
            content: '';
            position: absolute;
            left: -40px;
            bottom: -90px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(46, 107, 230, .35);
            filter: blur(10px);
        }

        .cta-inner>* {
            position: relative;
            z-index: 2;
        }

        .cta-inner h2 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, .7);
            font-size: 15px;
            margin-bottom: 28px;
        }

        .cta-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 14px;
        }

        /* --------- 页脚 --------- */
        .site-footer {
            background: var(--color-deep);
            color: rgba(255, 255, 255, .75);
            padding: 72px 0 36px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.4fr;
            gap: 48px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, .1);
            margin-bottom: 28px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            text-decoration: none;
        }

        .footer-logo .logo-text {
            color: #fff;
        }

        .footer-logo .logo-text span {
            color: rgba(255, 255, 255, .6);
        }

        .footer-title {
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-desc {
            font-size: 13px;
            line-height: 1.7;
            color: rgba(255, 255, 255, .6);
            margin-bottom: 16px;
            max-width: 320px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, .65);
            font-size: 14px;
            transition: color .2s;
            outline: none;
        }

        .footer-links a:hover,
        .footer-links a:focus-visible {
            color: #fff;
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .subscribe-form {
            display: flex;
            gap: 8px;
            max-width: 320px;
        }

        .subscribe-form input {
            flex: 1;
            min-width: 0;
            padding: 11px 16px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, .15);
            background: rgba(255, 255, 255, .08);
            color: #fff;
            font-size: 14px;
            outline: none;
            transition: all .25s ease;
        }

        .subscribe-form input::placeholder {
            color: rgba(255, 255, 255, .4);
        }

        .subscribe-form input:focus {
            border-color: var(--color-accent);
            background: rgba(255, 255, 255, .14);
        }

        .subscribe-form button {
            padding: 11px 20px;
            background: var(--color-accent);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: background .25s ease;
            white-space: nowrap;
            outline: none;
        }

        .subscribe-form button:hover {
            background: var(--color-accent-hover);
        }

        .subscribe-form button:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 2px;
        }

        .footer-bottom {
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, .4);
            padding-top: 8px;
        }

        /* --------- toast --------- */
        .toast {
            position: fixed;
            bottom: 32px;
            left: 50%;
            transform: translateX(-50%) translateY(20px);
            background: var(--color-ink);
            color: #fff;
            padding: 14px 28px;
            border-radius: 10px;
            font-size: 14px;
            z-index: 9999;
            opacity: 0;
            transition: opacity .3s ease, transform .3s ease;
            pointer-events: none;
            box-shadow: 0 8px 30px rgba(0, 0, 0, .2);
            max-width: 90vw;
            text-align: center;
        }

        .toast.show {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        /* --------- 响应式 --------- */
        @media (max-width: 1024px) {
            .nav-list {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--color-surface);
                border-bottom: 1px solid var(--color-border);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 14px 20px 20px;
                display: none;
                box-shadow: 0 20px 40px rgba(20, 40, 77, .08);
                max-height: calc(100vh - 76px);
                overflow-y: auto;
            }

            .nav-list.open {
                display: flex;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-link {
                padding: 13px 8px;
                border-bottom: 1px solid var(--color-border);
                font-size: 15px;
                display: block;
            }

            .nav-link::after {
                display: none;
            }

            .nav-link.active {
                color: var(--color-brand);
            }

            .nav-cta {
                padding-top: 14px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }

            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .article-header {
                padding: 40px 0 28px;
                background:
                    linear-gradient(125deg, rgba(234, 241, 254, .96) 0%, rgba(255, 255, 255, .92) 60%, rgba(255, 255, 255, .4) 100%),
                    url('/assets/images/backpic/back-2.webp') no-repeat left center;
                background-size: cover;
            }

            .article-title {
                font-size: 25px;
            }

            .article-meta {
                gap: 10px;
            }

            .article-main {
                padding: 32px 0 16px;
            }

            .article-card {
                padding: 32px 22px;
            }

            .article-content {
                font-size: 15px;
                line-height: 1.75;
            }

            .article-content h2 {
                font-size: 21px;
                margin-top: 32px;
            }

            .article-content h3 {
                font-size: 18px;
            }

            .article-extras {
                flex-direction: column;
                align-items: flex-start;
                gap: 14px;
            }

            .share-actions {
                width: 100%;
            }

            .related-section {
                padding-top: 40px;
            }

            .related-head h2 {
                font-size: 21px;
            }

            .article-cta {
                padding: 32px 0 56px;
            }

            .cta-inner {
                padding: 40px 24px;
            }

            .cta-inner h2 {
                font-size: 20px;
            }

            .site-footer {
                padding: 56px 0 32px;
            }
        }

        @media (max-width: 640px) {
            .related-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                padding-bottom: 32px;
            }

            .breadcrumb .current {
                max-width: 180px;
            }

            .share-btn {
                flex: 1;
                justify-content: center;
            }

            .cta-actions .btn {
                width: 100%;
            }

            .subscribe-form {
                flex-direction: column;
                width: 100%;
            }

            .subscribe-form button {
                width: 100%;
            }
        }

/* roulang page: category2 */
:root {
            --color-brand: #2E6BE6;
            --color-brand-hover: #1D54C4;
            --color-brand-soft: #EDF3FD;
            --color-accent: #FF7A45;
            --color-accent-hover: #F26626;
            --color-deep: #14284D;
            --color-ink: #1B2A41;
            --color-text: #44566C;
            --color-muted: #8FA1B8;
            --color-bg: #F4F7FC;
            --color-surface: #FFFFFF;
            --color-border: #DCE5F0;
            --radius-lg: 16px;
            --radius-sm: 10px;
            --shadow-card: 0 1px 3px rgba(20, 40, 77, .06), 0 4px 14px rgba(20, 40, 77, .04);
            --shadow-hover: 0 8px 30px rgba(20, 40, 77, .12);
            --font-sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: var(--color-brand);
            text-decoration: none;
            transition: color .2s ease;
        }

        a:hover {
            color: var(--color-brand-hover);
        }

        button,
        input {
            font-family: inherit;
        }

        :focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .site-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========= Header & Nav ========= */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 80;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
        }

        .header-inner {
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 12px;
            background: linear-gradient(135deg, #2E6BE6 0%, #1D54C4 100%);
            position: relative;
            display: inline-block;
            box-shadow: 0 4px 10px rgba(46, 107, 230, .25);
        }

        .logo-icon::before {
            content: "";
            position: absolute;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: #fff;
            top: 7px;
            left: 8px;
            box-shadow: 10px 7px 0 -4px rgba(255, 255, 255, .9);
        }

        .logo-icon::after {
            content: "";
            position: absolute;
            width: 8px;
            height: 8px;
            background: var(--color-accent);
            border-radius: 50%;
            right: 6px;
            bottom: 6px;
            border: 2px solid #fff;
        }

        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--color-ink);
            letter-spacing: .5px;
            white-space: nowrap;
        }

        .logo-text span {
            color: var(--color-muted);
            font-weight: 500;
            font-size: 15px;
            margin-left: 4px;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
        }

        .nav-link {
            position: relative;
            padding: 6px 2px;
            color: var(--color-text);
            font-size: 15px;
            display: inline-block;
            transition: color .2s ease;
        }

        .nav-link::after {
            content: "";
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: 0;
            width: 16px;
            height: 3px;
            border-radius: 99px;
            background: var(--color-accent);
            opacity: 0;
            transition: opacity .25s ease;
        }

        .nav-link:hover {
            color: var(--color-brand);
        }

        .nav-link:hover::after {
            opacity: 1;
        }

        .nav-link.active {
            color: var(--color-ink);
            font-weight: 700;
        }

        .nav-link.active::after {
            opacity: 1;
        }

        .nav-cta {
            margin-left: 6px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            background: transparent;
            border: 1px solid transparent;
            border-radius: 10px;
            cursor: pointer;
            padding: 0;
        }

        .nav-toggle span {
            width: 22px;
            height: 2px;
            border-radius: 2px;
            background: var(--color-ink);
            transition: transform .3s ease, opacity .3s ease;
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========= Buttons ========= */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border: 0;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            padding: 13px 26px;
            cursor: pointer;
            transition: all .25s ease;
            text-align: center;
            white-space: nowrap;
            background: var(--color-brand);
            color: #fff;
            box-shadow: 0 4px 12px rgba(46, 107, 230, .22);
        }

        .btn:hover {
            background: var(--color-brand-hover);
            color: #fff;
            box-shadow: 0 8px 24px rgba(29, 84, 196, .28);
            transform: translateY(-2px);
        }

        .btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(29, 84, 196, .2);
        }

        .btn-sm {
            padding: 9px 18px;
            font-size: 14px;
        }

        .btn-secondary {
            background: #fff;
            color: var(--color-brand);
            border: 1.5px solid var(--color-brand);
            box-shadow: none;
        }

        .btn-secondary:hover {
            background: var(--color-brand-soft);
            color: var(--color-brand);
            box-shadow: none;
            transform: translateY(-2px);
        }

        .btn-accent {
            background: var(--color-accent);
            box-shadow: 0 4px 14px rgba(255, 122, 69, .28);
        }

        .btn-accent:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 8px 24px rgba(242, 102, 38, .3);
            transform: translateY(-2px);
        }

        .btn[disabled],
        .btn[aria-disabled="true"] {
            opacity: .5;
            pointer-events: none;
            cursor: not-allowed;
            transform: none;
        }

        /* ========= Page Head ========= */
        .page-head {
            background: var(--color-brand-soft);
            border-bottom: 1px solid var(--color-border);
            padding: 48px 0 42px;
        }

        .page-head-inner {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            flex-wrap: wrap;
        }

        .page-head-marker {
            width: 5px;
            height: 40px;
            border-radius: 6px;
            background: var(--color-accent);
            flex-shrink: 0;
            margin-top: 4px;
        }

        .page-head h1 {
            font-size: 36px;
            line-height: 1.25;
            font-weight: 800;
            color: var(--color-ink);
            letter-spacing: .5px;
        }

        .page-head p {
            width: 100%;
            max-width: 760px;
            font-size: 17px;
            color: var(--color-text);
            line-height: 1.8;
            margin-top: 6px;
        }

        /* ========= Section Title ========= */
        .section-head {
            margin-bottom: 44px;
        }

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-brand);
            background: var(--color-brand-soft);
            padding: 6px 14px;
            border-radius: 99px;
            font-weight: 600;
            margin-bottom: 14px;
        }

        .section-head h2 {
            font-size: 28px;
            line-height: 1.3;
            font-weight: 800;
            color: var(--color-ink);
        }

        .section-head p {
            margin-top: 10px;
            max-width: 680px;
            color: var(--color-text);
            font-size: 15px;
            line-height: 1.8;
        }

        /* ========= Timeline ========= */
        .timeline-section {
            padding: 96px 0 80px;
            background: var(--color-bg);
        }

        .timeline {
            position: relative;
            margin-top: 48px;
            padding-left: 36px;
        }

        .timeline::before {
            content: "";
            position: absolute;
            left: 11px;
            top: 10px;
            bottom: 20px;
            width: 2px;
            background: linear-gradient(180deg, var(--color-brand) 0%, var(--color-brand-soft) 100%);
            border-radius: 99px;
        }

        .timeline-item {
            position: relative;
            padding-bottom: 36px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-dot {
            position: absolute;
            left: -34px;
            top: 22px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: #fff;
            border: 3px solid var(--color-brand);
            box-shadow: 0 0 0 4px var(--color-brand-soft);
        }

        .timeline-card {
            display: flex;
            align-items: stretch;
            gap: 24px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .timeline-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .timeline-num {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--color-brand);
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            box-shadow: 0 4px 12px rgba(46, 107, 230, .22);
        }

        .timeline-body {
            flex: 1;
            min-width: 0;
        }

        .timeline-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 8px;
        }

        .timeline-body p {
            font-size: 14px;
            color: var(--color-text);
            line-height: 1.75;
        }

        .timeline-tag {
            display: inline-block;
            margin-top: 12px;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-brand);
            background: var(--color-brand-soft);
            padding: 4px 12px;
            border-radius: 999px;
        }

        .timeline-thumb {
            flex-shrink: 0;
            width: 180px;
            height: 130px;
            object-fit: cover;
            border-radius: 12px;
            box-shadow: 0 4px 14px rgba(20, 40, 77, .1);
            background: var(--color-brand-soft);
        }

        /* ========= Featured ========= */
        .featured-section {
            padding: 96px 0;
            background: var(--color-brand-soft);
        }

        .featured-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .featured-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: box-shadow .25s ease, transform .25s ease;
            display: flex;
            flex-direction: column;
        }

        .featured-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .featured-card .thumb {
            width: 100%;
            height: 190px;
            object-fit: cover;
            background: var(--color-brand-soft);
        }

        .featured-card .body {
            padding: 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .featured-card .tag {
            display: inline-flex;
            align-self: flex-start;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-brand);
            background: var(--color-brand-soft);
            padding: 4px 12px;
            border-radius: 999px;
            margin-bottom: 12px;
        }

        .featured-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-ink);
            line-height: 1.5;
            margin-bottom: 8px;
        }

        .featured-card p {
            font-size: 14px;
            color: var(--color-text);
            line-height: 1.75;
            flex: 1;
        }

        .featured-more {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            margin-top: 18px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-brand);
            transition: gap .2s ease;
        }

        .featured-more:hover {
            gap: 10px;
            color: var(--color-brand-hover);
        }

        /* ========= How To ========= */
        .howto-section {
            padding: 96px 0;
            background: linear-gradient(135deg, rgba(237, 243, 253, .95) 0%, rgba(255, 255, 255, .96) 60%, rgba(244, 247, 252, .96) 100%), url('/assets/images/backpic/back-2.webp') center / cover no-repeat;
            border-top: 1px solid var(--color-border);
        }

        .howto-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 44px;
        }

        .howto-step {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 28px 26px;
            box-shadow: var(--shadow-card);
            transition: transform .25s ease, box-shadow .25s ease;
            position: relative;
            overflow: hidden;
        }

        .howto-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .howto-step .step-num {
            font-size: 30px;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1;
            margin-bottom: 14px;
        }

        .howto-step h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-ink);
            margin-bottom: 8px;
        }

        .howto-step p {
            font-size: 14px;
            color: var(--color-text);
            line-height: 1.75;
        }

        /* ========= FAQ ========= */
        .faq-section {
            padding: 96px 0;
            background: var(--color-bg);
        }

        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 12px;
            margin-bottom: 14px;
            box-shadow: var(--shadow-card);
            transition: box-shadow .25s ease;
        }

        .faq-item.open {
            box-shadow: var(--shadow-hover);
        }

        .faq-q {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 22px;
            cursor: pointer;
            background: transparent;
            border: 0;
            width: 100%;
            text-align: left;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            border-radius: 12px;
        }

        .faq-q .q-mark {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: var(--color-brand-soft);
            color: var(--color-brand);
            font-size: 14px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .faq-toggle {
            margin-left: auto;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--color-brand-soft);
            position: relative;
            flex-shrink: 0;
            transition: background .25s ease;
        }

        .faq-toggle::before,
        .faq-toggle::after {
            content: "";
            position: absolute;
            background: var(--color-brand);
            border-radius: 2px;
            transition: transform .3s ease;
        }

        .faq-toggle::before {
            width: 12px;
            height: 2px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .faq-toggle::after {
            width: 2px;
            height: 12px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .faq-item.open .faq-toggle::after {
            transform: translate(-50%, -50%) rotate(90deg);
            opacity: 0;
        }

        .faq-a {
            display: none;
            padding: 0 22px 20px 66px;
            font-size: 14px;
            line-height: 1.8;
            color: var(--color-text);
        }

        .faq-item.open .faq-a {
            display: block;
        }

        /* ========= CTA ========= */
        .cta-section {
            padding: 80px 0;
            background: var(--color-bg);
        }

        .cta-card {
            max-width: 920px;
            margin: 0 auto;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 20px;
            padding: 52px 40px;
            text-align: center;
            box-shadow: var(--shadow-hover);
            position: relative;
            overflow: hidden;
        }

        .cta-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--color-brand), var(--color-accent));
            border-radius: 20px 20px 0 0;
        }

        .cta-card h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--color-ink);
            margin-bottom: 10px;
        }

        .cta-card p {
            font-size: 15px;
            color: var(--color-text);
            margin-bottom: 28px;
            line-height: 1.8;
        }

        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ========= Footer ========= */
        .site-footer {
            background: var(--color-deep);
            color: rgba(255, 255, 255, .72);
            padding: 80px 0 28px;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
            gap: 40px;
            align-items: start;
            padding-bottom: 48px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }

        .footer-logo .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: 10px;
        }

        .footer-logo .logo-text {
            color: #fff;
            font-size: 18px;
        }

        .footer-logo .logo-text span {
            color: rgba(255, 255, 255, .5);
        }

        .footer-desc {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, .62);
            max-width: 300px;
        }

        .footer-title {
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 18px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, .64);
            font-size: 14px;
            transition: color .2s ease;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .subscribe-form {
            display: flex;
            gap: 8px;
            margin-top: 12px;
        }

        .subscribe-form input {
            flex: 1;
            padding: 10px 14px;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, .16);
            background: rgba(255, 255, 255, .1);
            color: #fff;
            font-size: 14px;
            outline: none;
            min-width: 0;
            transition: border-color .2s ease, background .2s ease;
        }

        .subscribe-form input::placeholder {
            color: rgba(255, 255, 255, .36);
        }

        .subscribe-form input:focus {
            border-color: var(--color-accent);
            background: rgba(255, 255, 255, .16);
        }

        .subscribe-form button {
            padding: 10px 18px;
            border-radius: 10px;
            border: 0;
            background: var(--color-accent);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: background .2s ease, transform .2s ease;
            white-space: nowrap;
        }

        .subscribe-form button:hover {
            background: var(--color-accent-hover);
            transform: translateY(-2px);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 22px;
            color: rgba(255, 255, 255, .42);
            font-size: 13px;
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ========= Toast ========= */
        .toast {
            position: fixed;
            bottom: 36px;
            left: 50%;
            transform: translate(-50%, 30px);
            background: var(--color-ink);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 13px 22px;
            border-radius: 12px;
            box-shadow: 0 12px 30px rgba(20, 40, 77, .24);
            opacity: 0;
            visibility: hidden;
            transition: all .35s ease;
            z-index: 999;
            pointer-events: none;
        }

        .toast.show {
            opacity: 1;
            visibility: visible;
            transform: translate(-50%, 0);
        }

        /* ========= Responsive ========= */
        @media (max-width: 1024px) {
            .nav-list {
                gap: 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }

            .howto-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .site-header {
                backdrop-filter: none;
                background: rgba(255, 255, 255, .98);
            }

            .nav-toggle {
                display: flex;
            }

            .nav-list {
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                flex-direction: column;
                align-items: flex-start;
                gap: 2px;
                background: var(--color-surface);
                border-bottom: 1px solid var(--color-border);
                box-shadow: 0 20px 40px rgba(20, 40, 77, .08);
                padding: 12px 24px 20px;
                display: none;
            }

            .nav-list.open {
                display: flex;
                animation: nav-fade .25s ease;
            }

            @keyframes nav-fade {
                from {
                    opacity: 0;
                    transform: translateY(-8px);
                }
                to {
                    opacity: 1;
                    transform: translateY(0);
                }
            }

            .nav-list li {
                width: 100%;
            }

            .nav-list .nav-link {
                width: 100%;
                padding: 12px 0;
                font-size: 16px;
                border-bottom: 1px solid rgba(220, 229, 240, .5);
            }

            .nav-link::after {
                display: none;
            }

            .nav-cta {
                margin-left: 0;
                padding-top: 14px;
            }

            .timeline-section,
            .featured-section,
            .howto-section,
            .faq-section,
            .cta-section {
                padding: 72px 0 60px;
            }

            .page-head h1 {
                font-size: 30px;
            }

            .page-head p {
                font-size: 15px;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .timeline-card {
                flex-direction: column;
            }

            .timeline-thumb {
                width: 100%;
                height: 180px;
            }

            .featured-grid {
                grid-template-columns: 1fr;
            }

            .howto-grid {
                grid-template-columns: 1fr;
            }

            .cta-card {
                padding: 40px 24px;
            }

            .cta-card h2 {
                font-size: 22px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                padding-bottom: 32px;
            }

            .site-footer {
                padding-top: 56px;
            }
        }

        @media (max-width: 520px) {
            .site-container {
                padding: 0 18px;
            }

            .header-inner {
                height: 64px;
            }

            .nav-list {
                top: 64px;
            }

            .logo-text {
                font-size: 18px;
            }

            .logo-text span {
                font-size: 13px;
            }

            .timeline {
                padding-left: 30px;
            }

            .timeline-dot {
                left: -27px;
            }

            .timeline-card {
                padding: 18px;
            }

            .timeline-num {
                width: 38px;
                height: 38px;
                font-size: 14px;
            }

            .cta-actions {
                flex-direction: column;
                width: 100%;
            }

            .cta-actions .btn {
                width: 100%;
            }

            .subscribe-form {
                flex-direction: column;
            }
        }