/* roulang page: index */
:root {
            --primary: #0b1f33;
            --primary-light: #132d47;
            --accent: #2e9bd6;
            --accent-light: #7dd3fc;
            --bg: #f7fafc;
            --bg-dark: #0a1420;
            --text: #0f172a;
            --text-muted: #5b6b7a;
            --border: #e2eaf1;
            --radius: 1rem;
            --radius-lg: 1.5rem;
            --shadow-sm: 0 1px 3px rgba(15, 35, 55, .06);
            --shadow: 0 6px 24px rgba(15, 35, 55, .08);
            --shadow-lg: 0 16px 48px rgba(15, 35, 55, .14);
        }

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

        html {
            scroll-behavior: smooth;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color .25s;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        .section-pad {
            padding: 5rem 0;
        }

        .section-header {
            max-width: 720px;
            margin-bottom: 3rem;
        }

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            font-size: .8rem;
            font-weight: 600;
            letter-spacing: .08em;
            color: var(--accent);
            background: rgba(46, 155, 214, .1);
            padding: .35rem 1rem;
            border-radius: 999px;
            margin-bottom: 1rem;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -.02em;
            color: var(--primary);
            margin: 0 0 .75rem;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.8;
        }

        /* ---------- header ---------- */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .86);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            height: 68px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: .65rem;
            flex-shrink: 0;
        }

        .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: 12px;
            background: linear-gradient(135deg, #0b1f33 0%, #1d4e6e 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.15rem;
            box-shadow: 0 4px 14px rgba(11, 31, 51, .25);
        }

        .brand-name {
            font-size: 1.12rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -.01em;
            white-space: nowrap;
        }

        .brand-name .full {
            display: inline;
        }

        .brand-name .short {
            display: none;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: .25rem;
        }

        .nav-link {
            font-size: .9rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: .5rem .9rem;
            border-radius: 999px;
            transition: all .25s;
        }

        .nav-link:hover {
            color: var(--primary);
            background: rgba(15, 40, 60, .06);
        }

        .nav-link.active {
            color: var(--primary);
            background: rgba(46, 155, 214, .12);
            font-weight: 600;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: .75rem;
        }

        .search-box {
            display: flex;
            align-items: center;
            gap: .5rem;
            background: #f1f5f9;
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: .4rem .9rem;
            transition: all .25s;
            width: 190px;
        }

        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(46, 155, 214, .15);
            background: #fff;
        }

        .search-box i {
            color: #8a9baa;
            font-size: .85rem;
        }

        .search-box input {
            border: none;
            background: transparent;
            font-size: .85rem;
            color: var(--text);
            width: 100%;
            outline: none;
        }

        .search-box input::placeholder {
            color: #9aa9b8;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: .45rem;
            background: var(--primary);
            color: #fff;
            font-size: .88rem;
            font-weight: 600;
            padding: .55rem 1.25rem;
            border-radius: 999px;
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 14px rgba(11, 31, 51, .2);
            transition: all .25s;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(11, 31, 51, .28);
            background: var(--primary-light);
        }

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

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: .45rem;
            background: transparent;
            color: var(--primary);
            border: 1.5px solid rgba(46, 155, 214, .45);
            font-size: .88rem;
            font-weight: 600;
            padding: .55rem 1.25rem;
            border-radius: 999px;
            cursor: pointer;
            transition: all .25s;
        }

        .btn-outline:hover {
            background: rgba(46, 155, 214, .08);
            border-color: var(--accent);
            transform: translateY(-2px);
        }

        .menu-toggle {
            display: none;
            background: transparent;
            border: none;
            font-size: 1.4rem;
            color: var(--primary);
            cursor: pointer;
            padding: .3rem;
            border-radius: .5rem;
        }

        .mobile-menu {
            display: none;
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 1rem 1.25rem 1.25rem;
        }

        .mobile-menu a {
            display: block;
            padding: .7rem .8rem;
            border-radius: .75rem;
            font-weight: 500;
            color: var(--text-muted);
        }

        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: rgba(46, 155, 214, .1);
            color: var(--primary);
        }

        /* ---------- hero ---------- */
        .hero {
            position: relative;
            background: url('/assets/images/backpic/back-1.png') center / cover no-repeat;
            padding: 6rem 0 4.5rem;
        }

        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(115deg, rgba(8, 20, 35, .92) 0%, rgba(8, 20, 35, .72) 45%, rgba(13, 35, 55, .35) 100%);
        }

        .hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.1fr .9fr;
            gap: 3rem;
            align-items: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: rgba(255, 255, 255, .12);
            border: 1px solid rgba(255, 255, 255, .22);
            color: #cfeaf7;
            font-size: .82rem;
            font-weight: 500;
            padding: .35rem 1rem;
            border-radius: 999px;
            margin-bottom: 1.25rem;
        }

        .hero-badge i {
            color: #7dd3fc;
            font-size: .7rem;
        }

        .hero h1 {
            font-size: 2.75rem;
            font-weight: 900;
            line-height: 1.2;
            color: #fff;
            letter-spacing: -.02em;
            margin: 0 0 1.1rem;
        }

        .hero h1 span.highlight {
            color: #7dd3fc;
        }

        .hero-desc {
            font-size: 1.05rem;
            color: rgba(230, 242, 250, .88);
            line-height: 1.9;
            max-width: 520px;
            margin-bottom: 1.8rem;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: .8rem;
            margin-bottom: 2.2rem;
        }

        .hero-actions .btn-primary {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 6px 18px rgba(0, 0, 0, .25);
        }

        .hero-actions .btn-primary:hover {
            background: #eef6fb;
            box-shadow: 0 10px 26px rgba(0, 0, 0, .3);
        }

        .hero-actions .btn-outline {
            border-color: rgba(255, 255, 255, .5);
            color: #fff;
        }

        .hero-actions .btn-outline:hover {
            background: rgba(255, 255, 255, .1);
            border-color: #fff;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
            max-width: 520px;
        }

        .hero-stat {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .15);
            border-radius: var(--radius);
            padding: .9rem 1rem;
            text-align: center;
            backdrop-filter: blur(6px);
        }

        .hero-stat .num {
            font-size: 1.45rem;
            font-weight: 800;
            color: #7dd3fc;
            line-height: 1.2;
        }

        .hero-stat .label {
            font-size: .78rem;
            color: rgba(230, 242, 250, .75);
            margin-top: .25rem;
        }

        .hero-card {
            background: rgba(255, 255, 255, .07);
            border: 1px solid rgba(255, 255, 255, .18);
            border-radius: var(--radius-lg);
            padding: 2rem 1.8rem;
            backdrop-filter: blur(10px);
        }

        .hero-card-title {
            color: #fff;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: .6rem;
        }

        .hero-card-item {
            display: flex;
            align-items: center;
            gap: .8rem;
            padding: .7rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, .1);
            color: rgba(230, 242, 250, .85);
            font-size: .9rem;
        }

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

        .hero-card-item i {
            color: #7dd3fc;
            width: 20px;
            text-align: center;
        }

        /* ---------- about ---------- */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .about-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }

        .about-image img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            transition: transform .6s;
        }

        .about-image:hover img {
            transform: scale(1.04);
        }

        .about-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 60%, rgba(11, 31, 51, .25));
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: .9rem;
            margin-top: 1.6rem;
        }

        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: .7rem;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: .9rem 1rem;
            transition: all .3s;
        }

        .feature-item:hover {
            box-shadow: var(--shadow);
            transform: translateY(-2px);
            border-color: rgba(46, 155, 214, .3);
        }

        .feature-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: rgba(46, 155, 214, .12);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: .9rem;
            flex-shrink: 0;
        }

        .feature-item strong {
            font-size: .9rem;
            color: var(--primary);
            display: block;
            line-height: 1.3;
        }

        .feature-item span {
            font-size: .78rem;
            color: var(--text-muted);
        }

        /* ---------- entry cards ---------- */
        .entry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }

        .entry-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all .35s;
        }

        .entry-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-6px);
            border-color: rgba(46, 155, 214, .25);
        }

        .entry-card-img {
            height: 180px;
            overflow: hidden;
            position: relative;
        }

        .entry-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s;
        }

        .entry-card:hover .entry-card-img img {
            transform: scale(1.06);
        }

        .entry-card-body {
            padding: 1.4rem 1.5rem 1.6rem;
        }

        .entry-card-tag {
            display: inline-block;
            font-size: .75rem;
            font-weight: 600;
            color: var(--accent);
            background: rgba(46, 155, 214, .1);
            padding: .25rem .8rem;
            border-radius: 999px;
            margin-bottom: .7rem;
        }

        .entry-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 .5rem;
            line-height: 1.4;
        }

        .entry-card p {
            font-size: .88rem;
            color: var(--text-muted);
            margin: 0 0 1rem;
            line-height: 1.7;
        }

        .card-link {
            font-size: .85rem;
            font-weight: 600;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: .35rem;
            transition: gap .3s;
        }

        .card-link:hover {
            gap: .7rem;
            color: var(--primary);
        }

        /* ---------- news ---------- */
        .news-section {
            background: var(--bg-dark);
            position: relative;
        }

        .news-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center / cover no-repeat;
            opacity: .08;
        }

        .news-section .container {
            position: relative;
            z-index: 2;
        }

        .news-section .section-title {
            color: #fff;
        }

        .news-section .section-subtitle {
            color: rgba(230, 242, 250, .7);
        }

        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }

        .news-card {
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(255, 255, 255, .12);
            border-radius: var(--radius-lg);
            padding: 1.6rem 1.5rem;
            transition: all .3s;
        }

        .news-card:hover {
            background: rgba(255, 255, 255, .1);
            border-color: rgba(125, 211, 252, .35);
            transform: translateY(-4px);
            box-shadow: 0 12px 34px rgba(0, 0, 0, .35);
        }

        .news-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: .8rem;
        }

        .news-badge {
            font-size: .72rem;
            font-weight: 600;
            color: #7dd3fc;
            background: rgba(125, 211, 252, .14);
            padding: .25rem .8rem;
            border-radius: 999px;
        }

        .news-date {
            font-size: .78rem;
            color: rgba(230, 242, 250, .55);
        }

        .news-card h3 {
            font-size: 1.02rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.5;
            margin: 0 0 .5rem;
        }

        .news-card h3 a {
            color: inherit;
        }

        .news-card h3 a:hover {
            color: #7dd3fc;
        }

        .news-card p {
            font-size: .85rem;
            color: rgba(230, 242, 250, .65);
            line-height: 1.7;
            margin: 0 0 1rem;
        }

        .news-link {
            font-size: .82rem;
            font-weight: 600;
            color: #7dd3fc;
            display: inline-flex;
            align-items: center;
            gap: .3rem;
        }

        .news-link:hover {
            gap: .6rem;
        }

        /* ---------- process ---------- */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        .process-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 2rem 1.5rem;
            position: relative;
            transition: all .3s;
        }

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

        .process-num {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--primary), #1d4e6e);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.2rem;
            box-shadow: 0 4px 12px rgba(11, 31, 51, .18);
        }

        .process-item h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 .5rem;
        }

        .process-item p {
            font-size: .84rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.7;
        }

        /* ---------- stats ---------- */
        .stats-bg {
            background: linear-gradient(135deg, #0b1f33, #102d46);
            border-radius: var(--radius-lg);
            padding: 3rem 2.5rem;
            position: relative;
            overflow: hidden;
        }

        .stats-bg::after {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(46, 155, 214, .12);
            top: -120px;
            right: -100px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            position: relative;
            z-index: 2;
        }

        .stat-item {
            text-align: center;
        }

        .stat-item .num {
            font-size: 2.2rem;
            font-weight: 900;
            color: #7dd3fc;
            line-height: 1.2;
        }

        .stat-item .label {
            font-size: .85rem;
            color: rgba(230, 242, 250, .75);
            margin-top: .3rem;
        }

        .stat-item::after {
            content: '';
            display: block;
            width: 40px;
            height: 3px;
            background: rgba(125, 211, 252, .5);
            border-radius: 2px;
            margin: .8rem auto 0;
        }

        /* ---------- faq ---------- */
        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: .8rem;
            overflow: hidden;
            transition: all .3s;
        }

        .faq-item:hover {
            border-color: rgba(46, 155, 214, .3);
            box-shadow: var(--shadow-sm);
        }

        .faq-item.open {
            border-color: rgba(46, 155, 214, .4);
            box-shadow: var(--shadow);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 1.4rem;
            cursor: pointer;
            font-size: .98rem;
            font-weight: 600;
            color: var(--primary);
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 8px;
            background: rgba(46, 155, 214, .12);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: transform .3s;
            font-size: .75rem;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .4s ease, padding .3s;
            padding: 0 1.4rem;
            font-size: .9rem;
            color: var(--text-muted);
            line-height: 1.8;
        }

        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 1.4rem 1.2rem;
        }

        /* ---------- cta ---------- */
        .cta-box {
            background: url('/assets/images/backpic/back-3.png') center / cover no-repeat;
            border-radius: var(--radius-lg);
            padding: 4rem 2.5rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 31, 51, .92), rgba(11, 31, 51, .75));
        }

        .cta-content {
            position: relative;
            z-index: 2;
        }

        .cta-content h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.35;
            margin: 0 0 .8rem;
        }

        .cta-content p {
            color: rgba(230, 242, 250, .85);
            font-size: 1rem;
            max-width: 560px;
            margin: 0 auto 1.8rem;
            line-height: 1.8;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: .8rem;
        }

        .cta-buttons .btn-primary {
            background: #fff;
            color: var(--primary);
            font-size: 1rem;
            padding: .75rem 2rem;
        }

        .cta-buttons .btn-primary:hover {
            background: #eef6fb;
        }

        .cta-buttons .btn-outline {
            border-color: rgba(255, 255, 255, .55);
            color: #fff;
            font-size: 1rem;
            padding: .75rem 2rem;
        }

        .cta-buttons .btn-outline:hover {
            background: rgba(255, 255, 255, .12);
        }

        /* ---------- footer ---------- */
        .site-footer {
            background: #0a1420;
            color: rgba(230, 242, 250, .7);
            padding: 3.5rem 0 2rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }

        .footer-brand {
            font-size: 1.15rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: .6rem;
            margin-bottom: .8rem;
        }

        .footer-brand .brand-icon {
            width: 34px;
            height: 34px;
            border-radius: 10px;
            font-size: 1rem;
        }

        .footer-desc {
            font-size: .86rem;
            line-height: 1.8;
            max-width: 360px;
        }

        .footer-title {
            font-size: .9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
            letter-spacing: .04em;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: .55rem;
        }

        .footer-links a {
            font-size: .86rem;
            color: rgba(230, 242, 250, .65);
            transition: all .25s;
        }

        .footer-links a:hover {
            color: #7dd3fc;
            padding-left: .3rem;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            font-size: .82rem;
            color: rgba(230, 242, 250, .5);
        }

        .footer-bottom a {
            color: rgba(230, 242, 250, .7);
        }

        .footer-bottom a:hover {
            color: #7dd3fc;
        }

        /* ---------- responsive ---------- */
        @media (max-width: 1024px) {
            .header-inner {
                height: 62px;
            }

            .search-box {
                width: 150px;
            }

            .about-grid {
                gap: 2rem;
            }

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

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.6rem;
            }

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

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

        @media (max-width: 768px) {
            .section-pad {
                padding: 3.5rem 0;
            }

            .main-nav,
            .header-actions {
                display: none;
            }

            .menu-toggle {
                display: block;
            }

            .mobile-menu.show {
                display: block;
            }

            .hero {
                padding: 4rem 0 3rem;
            }

            .hero-inner {
                grid-template-columns: 1fr;
                gap: 2rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .hero-stats {
                grid-template-columns: repeat(3, 1fr);
            }

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

            .about-image img {
                height: 260px;
            }

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

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

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

            .stats-bg {
                padding: 2.5rem 1.5rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.8rem;
            }

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

        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }

            .brand-name .full {
                display: none;
            }

            .brand-name .short {
                display: inline;
            }

            .hero h1 {
                font-size: 1.65rem;
            }

            .hero-stats {
                grid-template-columns: 1fr 1fr;
            }

            .section-title {
                font-size: 1.5rem;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.2rem;
            }

            .stat-item .num {
                font-size: 1.6rem;
            }

            .cta-box {
                padding: 2.5rem 1.2rem;
            }

            .cta-content h2 {
                font-size: 1.5rem;
            }

            .hero-actions .btn-primary,
            .hero-actions .btn-outline {
                width: 100%;
                justify-content: center;
            }

            .about-features {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #0f172a;
            --accent: #4f46e5;
            --cyan: #06b6d4;
            --bg: #f8fafc;
            --surface: #ffffff;
            --text: #0f172a;
            --muted: #64748b;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
            --container: 1200px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            border: none;
            background: none;
            cursor: pointer;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }

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

        /* 顶部导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
        }
        .header-inner {
            display: flex;
            align-items: center;
            gap: 32px;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 18px;
            color: var(--primary);
            white-space: nowrap;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, #4f46e5, #06b6d4);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 15px;
            flex-shrink: 0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 24px;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--muted);
            padding: 6px 2px;
            position: relative;
            transition: color 0.2s;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .header-tools {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-left: auto;
        }
        .search-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            background: #f1f5f9;
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 8px 16px;
            width: 200px;
            transition: all 0.25s;
        }
        .search-bar:focus-within {
            background: #fff;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }
        .search-bar i {
            color: var(--muted);
            font-size: 14px;
            flex-shrink: 0;
        }
        .search-bar input {
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
            width: 100%;
            color: var(--text);
        }
        .search-bar input::placeholder {
            color: #94a3b8;
        }
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 9px 20px;
            border-radius: 999px;
            transition: all 0.2s;
            box-shadow: 0 4px 14px rgba(79, 70, 229, 0.28);
            white-space: nowrap;
        }
        .header-cta:hover {
            background: #4338ca;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(79, 70, 229, 0.36);
        }
        .header-cta:active {
            transform: translateY(0);
        }
        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: #f1f5f9;
            color: var(--text);
            font-size: 17px;
            align-items: center;
            justify-content: center;
            transition: background 0.2s;
        }
        .menu-toggle:hover {
            background: #e2e8f0;
        }

        /* 移动端菜单 */
        .mobile-menu {
            display: none;
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 16px 24px 24px;
        }
        .mobile-menu.active {
            display: block;
        }
        .mobile-link {
            display: block;
            padding: 12px 0;
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            border-bottom: 1px solid #f1f5f9;
            transition: color 0.2s;
        }
        .mobile-link:hover {
            color: var(--accent);
        }
        .mobile-link.active {
            color: var(--accent);
            font-weight: 600;
        }
        .mobile-search {
            display: flex;
            align-items: center;
            gap: 8px;
            background: #f1f5f9;
            border-radius: 10px;
            padding: 10px 14px;
            margin-top: 14px;
            border: 1px solid transparent;
        }
        .mobile-search:focus-within {
            border-color: var(--accent);
            background: #fff;
        }
        .mobile-search input {
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
            width: 100%;
        }
        .mobile-btn {
            display: flex;
            margin-top: 14px;
            justify-content: center;
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            padding: 11px 24px;
            border-radius: 999px;
            transition: all 0.25s;
            box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: #4338ca;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.3);
            font-size: 15px;
            font-weight: 600;
            padding: 11px 24px;
            border-radius: 999px;
            transition: all 0.25s;
            backdrop-filter: blur(4px);
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-2px);
        }
        .btn-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--text);
            font-size: 15px;
            font-weight: 600;
            padding: 11px 24px;
            border-radius: 999px;
            transition: all 0.25s;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
        }
        .btn-light:hover {
            background: #f1f5f9;
            transform: translateY(-2px);
        }

        /* Hero */
        .category-hero {
            position: relative;
            padding: 120px 0 108px;
            background-size: cover;
            background-position: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.7) 50%, rgba(6, 182, 212, 0.35) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 720px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.14);
            border: 1px solid rgba(255, 255, 255, 0.22);
            color: #fff;
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 13px;
            margin-bottom: 22px;
            backdrop-filter: blur(6px);
            letter-spacing: 0.04em;
        }
        .category-hero h1 {
            font-size: 46px;
            color: #fff;
            font-weight: 800;
            line-height: 1.18;
            margin-bottom: 18px;
            letter-spacing: -0.02em;
        }
        .category-hero p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.88);
            max-width: 600px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        /* 通用板块 */
        .section {
            padding: 92px 0;
        }
        .section-alt {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .section-head {
            max-width: 720px;
            margin: 0 auto 56px;
            text-align: center;
        }
        .eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--accent);
            background: rgba(79, 70, 229, 0.08);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 14px;
        }
        .section-head h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 14px;
            line-height: 1.3;
            letter-spacing: -0.01em;
        }
        .section-head p {
            font-size: 16px;
            color: var(--muted);
            line-height: 1.75;
        }

        /* 卡片 */
        .entry-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 26px;
            transition: all 0.28s;
            position: relative;
            height: 100%;
        }
        .entry-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-5px);
            border-color: rgba(79, 70, 229, 0.28);
        }
        .entry-card:active {
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .entry-icon {
            width: 54px;
            height: 54px;
            border-radius: 14px;
            background: linear-gradient(135deg, #eef2ff, #ecfeff);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
            transition: transform 0.25s;
        }
        .entry-card:hover .entry-icon {
            transform: scale(1.06);
        }
        .entry-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .entry-card p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.75;
            margin-bottom: 16px;
        }
        .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            background: #f1f5f9;
            color: var(--muted);
            padding: 4px 12px;
            border-radius: 999px;
        }
        .tag-brand {
            background: rgba(79, 70, 229, 0.08);
            color: var(--accent);
        }
        .tag-cyan {
            background: rgba(6, 182, 212, 0.1);
            color: #0891b2;
        }

        /* 步骤 */
        .steps-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
            position: relative;
            overflow: hidden;
        }
        .steps-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 300px;
            height: 300px;
            background: rgba(6, 182, 212, 0.12);
            border-radius: 50%;
            filter: blur(80px);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 1;
        }
        .step-item {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            padding: 32px 24px;
            transition: all 0.25s;
            backdrop-filter: blur(6px);
        }
        .step-item:hover {
            background: rgba(255, 255, 255, 0.09);
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-3px);
        }
        .step-num {
            font-size: 38px;
            font-weight: 800;
            color: rgba(255, 255, 255, 0.14);
            line-height: 1;
            margin-bottom: 18px;
            display: block;
        }
        .step-item h3 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .step-item p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
        }
        .steps-extra {
            margin-top: 28px;
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
        }
        .steps-extra i {
            color: #06b6d4;
            margin-right: 6px;
        }

        /* 内容卡片 */
        .content-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all 0.28s;
            display: block;
            height: 100%;
        }
        .content-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-5px);
            border-color: rgba(79, 70, 229, 0.22);
        }
        .content-card:active {
            transform: translateY(-2px);
        }
        .card-media {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #e2e8f0;
            position: relative;
        }
        .card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.45s ease;
        }
        .content-card:hover .card-media img {
            transform: scale(1.05);
        }
        .card-media::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 23, 42, 0.18), transparent 60%);
        }
        .card-body {
            padding: 26px;
        }
        .card-body .tag {
            margin-bottom: 12px;
        }
        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }
        .card-body p {
            font-size: 14px;
            color: var(--muted);
            line-height: 1.75;
            margin-bottom: 18px;
        }
        .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap 0.2s;
        }
        .card-link:hover {
            gap: 10px;
        }

        /* 数据统计 */
        .stats-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
            padding: 76px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-item {
            text-align: center;
            padding: 36px 20px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius);
            transition: all 0.25s;
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-3px);
        }
        .stat-number {
            font-size: 40px;
            font-weight: 800;
            color: #fff;
            display: block;
            line-height: 1.2;
            margin-bottom: 8px;
            letter-spacing: -0.02em;
        }
        .stat-number .unit {
            font-size: 22px;
            color: #06b6d4;
        }
        .stat-label {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            margin-top: 6px;
            display: block;
        }

        /* FAQ */
        .faq-container {
            max-width: 840px;
            margin: 0 auto;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            overflow: hidden;
            transition: all 0.25s;
        }
        .faq-item.open {
            border-color: rgba(79, 70, 229, 0.35);
            box-shadow: var(--shadow);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            text-align: left;
            color: var(--text);
            gap: 16px;
            transition: color 0.2s;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            transition: transform 0.3s;
            color: var(--muted);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 24px 22px;
            font-size: 15px;
            color: var(--muted);
            line-height: 1.85;
        }

        /* CTA */
        .cta-box {
            position: relative;
            border-radius: 24px;
            padding: 72px 56px;
            text-align: center;
            overflow: hidden;
            background-size: cover;
            background-position: center;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(120deg, rgba(79, 70, 229, 0.92), rgba(6, 182, 212, 0.86));
        }
        .cta-content {
            position: relative;
            z-index: 1;
        }
        .cta-box h2 {
            color: #fff;
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }
        .cta-box p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 16px;
            margin-bottom: 30px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-actions {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* 页脚 */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 44px;
        }
        .footer-brand {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }
        .footer-brand .brand-icon {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: linear-gradient(135deg, #4f46e5, #06b6d4);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
        }
        .footer-desc {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.55);
            max-width: 380px;
        }
        .footer-title {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: color 0.2s;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 22px 0;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .main-nav {
                gap: 18px;
            }
            .search-bar {
                width: 160px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 820px) {
            .main-nav,
            .search-bar,
            .header-cta {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .header-inner {
                gap: 16px;
            }
            .header-tools {
                margin-left: auto;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 64px 0;
            }
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .category-hero {
                padding: 84px 0 72px;
            }
            .category-hero h1 {
                font-size: 32px;
            }
            .category-hero p {
                font-size: 15px;
            }
            .cta-box {
                padding: 48px 24px;
            }
            .cta-box h2 {
                font-size: 26px;
            }
            .header-inner {
                height: 64px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 24px 12px;
            }
            .stat-number {
                font-size: 30px;
            }
            .section-head h2 {
                font-size: 26px;
            }
            .section-head p {
                font-size: 15px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: flex-start;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-ghost {
                width: 100%;
                justify-content: center;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-actions {
                flex-direction: column;
            }
            .cta-actions .btn-primary,
            .cta-actions .btn-light {
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: article */
:root {
            --brand: #2563eb;
            --brand-dark: #1d4ed8;
            --accent: #0ea5e9;
            --ink: #0f172a;
            --ink-soft: #334155;
            --ink-muted: #64748b;
            --line: #e2e8f0;
            --bg: #f8fafc;
            --surface: #ffffff;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow-card: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 12px 32px rgba(15, 23, 42, 0.1);
            --transition: all 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

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

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

        button,
        input {
            font: inherit;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        summary:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            width: 100%;
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            width: 100%;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--line);
        }

        .brand-icon {
            width: 2.35rem;
            height: 2.35rem;
            border-radius: 0.7rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #1d4ed8, #0ea5e9);
            color: #fff;
            font-size: 0.95rem;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.875rem;
            font-size: 0.94rem;
            font-weight: 500;
            color: var(--ink-soft);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--brand);
            background: #eff6ff;
        }

        .nav-link.active {
            color: var(--brand);
            font-weight: 600;
            background: #eff6ff;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0.875rem;
            right: 0.875rem;
            bottom: 0;
            height: 2px;
            background: var(--brand);
            border-radius: 999px;
        }

        .command-search {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 999px;
            padding: 0.375rem 0.75rem;
            width: 200px;
            transition: var(--transition);
        }

        .command-search:focus-within {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            background: #fff;
        }

        .command-search input {
            border: none;
            background: transparent;
            outline: none;
            font-size: 0.85rem;
            color: var(--ink);
            width: 100%;
        }

        .command-search kbd {
            flex-shrink: 0;
            font-size: 0.7rem;
            color: var(--ink-muted);
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 4px;
            padding: 0.1rem 0.375rem;
            font-family: inherit;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
        }

        .mobile-menu {
            display: none;
        }

        .mobile-menu.open {
            display: block;
            border-top: 1px solid var(--line);
            background: #fff;
            padding: 0.75rem 1rem 1rem;
        }

        .mobile-nav-link {
            display: block;
            padding: 0.625rem 0.875rem;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--ink-soft);
            transition: var(--transition);
        }

        .mobile-nav-link:hover,
        .mobile-nav-link.active {
            color: var(--brand);
            background: #eff6ff;
        }

        @media (min-width: 768px) {
            .mobile-menu {
                display: none !important;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border-radius: var(--radius-sm);
            padding: 0.625rem 1.25rem;
            font-size: 0.9rem;
            font-weight: 500;
            transition: var(--transition);
            cursor: pointer;
            border: 1px solid transparent;
            line-height: 1.4;
        }

        .btn:active {
            transform: scale(0.98);
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
        }

        .btn-light {
            background: #fff;
            color: var(--ink);
        }

        .btn-light:hover {
            background: #f1f5f9;
            transform: translateY(-1px);
        }

        .btn-outline-light {
            background: transparent;
            border-color: rgba(255, 255, 255, 0.6);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-1px);
        }

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

        .btn-outline-primary:hover {
            background: #eff6ff;
            border-color: var(--brand);
        }

        .btn-sm {
            padding: 0.475rem 1rem;
            font-size: 0.85rem;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            border-radius: 999px;
            padding: 0.25rem 0.875rem;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .badge-light {
            background: rgba(255, 255, 255, 0.14);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            backdrop-filter: blur(4px);
        }

        .tag {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            background: #f1f5f9;
            border: 1px solid var(--line);
            color: var(--ink-muted);
            border-radius: 999px;
            padding: 0.3rem 0.875rem;
            font-size: 0.8rem;
            transition: var(--transition);
        }

        .tag:hover {
            background: #eff6ff;
            border-color: #bfdbfe;
            color: var(--brand);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            isolation: isolate;
            background: #0f172a;
        }

        .article-hero-backdrop {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.55;
            z-index: -2;
        }

        .article-hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 58, 138, 0.82) 100%);
            z-index: -1;
        }

        .article-hero-content {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
            transition: color 0.25s ease;
            display: inline-flex;
            align-items: center;
        }

        .breadcrumb a:hover {
            color: #fff;
        }

        .breadcrumb-current {
            max-width: 260px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            color: rgba(255, 255, 255, 0.85);
        }

        @media (min-width: 640px) {
            .breadcrumb-current {
                max-width: 480px;
            }
        }

        /* ===== Article Main ===== */
        .article-main-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 1.5rem;
        }

        @media (min-width: 640px) {
            .article-main-card {
                padding: 2.5rem;
            }
        }

        .article-content-body {
            font-size: 1.04rem;
            line-height: 1.9;
            color: var(--ink-soft);
        }

        .article-content-body> :first-child {
            margin-top: 0;
        }

        .article-content-body> :last-child {
            margin-bottom: 0;
        }

        .article-content-body p {
            margin-bottom: 1.25rem;
        }

        .article-content-body h2 {
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--ink);
            margin: 2.25rem 0 0.875rem;
            line-height: 1.4;
        }

        .article-content-body h3 {
            font-size: 1.28rem;
            font-weight: 600;
            color: var(--ink);
            margin: 1.75rem 0 0.625rem;
            line-height: 1.45;
        }

        .article-content-body h4 {
            font-size: 1.08rem;
            font-weight: 600;
            color: var(--ink);
            margin: 1.25rem 0 0.5rem;
        }

        .article-content-body ul {
            padding-left: 1.5rem;
            margin-bottom: 1.25rem;
            list-style: disc;
        }

        .article-content-body ol {
            padding-left: 1.5rem;
            margin-bottom: 1.25rem;
            list-style: decimal;
        }

        .article-content-body li {
            margin-bottom: 0.4rem;
        }

        .article-content-body a {
            color: var(--brand);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content-body a:hover {
            color: var(--brand-dark);
        }

        .article-content-body img {
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            margin: 1.5rem 0;
            max-width: 100%;
        }

        .article-content-body blockquote {
            border-left: 4px solid var(--brand);
            background: #eff6ff;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            padding: 1rem 1.25rem;
            margin: 1.5rem 0;
            color: var(--ink-soft);
        }

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

        .article-content-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.92rem;
        }

        .article-content-body th,
        .article-content-body td {
            border: 1px solid var(--line);
            padding: 0.625rem 0.875rem;
            text-align: left;
        }

        .article-content-body th {
            background: #f8fafc;
            font-weight: 600;
            color: var(--ink);
        }

        .article-content-body code {
            background: #f1f5f9;
            border: 1px solid var(--line);
            border-radius: 4px;
            padding: 0.15rem 0.4rem;
            font-size: 0.85em;
            font-family: 'SFMono-Regular', Consolas, monospace;
            color: #be185d;
        }

        .article-content-body pre {
            background: #0f172a;
            color: #e2e8f0;
            border-radius: var(--radius-md);
            padding: 1.25rem;
            overflow-x: auto;
            margin: 1.5rem 0;
            line-height: 1.65;
            font-size: 0.9rem;
        }

        .article-content-body pre code {
            background: transparent;
            border: none;
            padding: 0;
            color: inherit;
            font-size: inherit;
        }

        /* ===== Sidebar ===== */
        .sidebar-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 1.5rem;
        }

        .sidebar-card-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--line);
        }

        .sidebar-news-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.75rem;
            padding: 0.625rem 0;
            border-bottom: 1px dashed var(--line);
            transition: var(--transition);
        }

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

        .sidebar-news-main {
            display: flex;
            flex-direction: column;
            gap: 0.125rem;
            min-width: 0;
        }

        .sidebar-news-title {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--ink-soft);
            line-height: 1.4;
            transition: color 0.25s ease;
        }

        .sidebar-news-date {
            font-size: 0.75rem;
            color: var(--ink-muted);
        }

        .sidebar-news-icon {
            flex-shrink: 0;
            font-size: 0.72rem;
            color: #cbd5e1;
            transition: all 0.25s ease;
        }

        .sidebar-news-item:hover {
            padding-left: 0.25rem;
        }

        .sidebar-news-item:hover .sidebar-news-title,
        .sidebar-news-item.active .sidebar-news-title {
            color: var(--brand);
        }

        .sidebar-news-item:hover .sidebar-news-icon,
        .sidebar-news-item.active .sidebar-news-icon {
            color: var(--brand);
            transform: translateX(3px);
        }

        /* ===== Recommended ===== */
        .recommend-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

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

        .recommend-card-image {
            height: 200px;
            overflow: hidden;
            position: relative;
            background: #e2e8f0;
        }

        .recommend-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.45s ease;
        }

        .recommend-card:hover .recommend-card-image img {
            transform: scale(1.05);
        }

        .recommend-card-content {
            padding: 1.25rem;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .recommend-card-content h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.5;
            margin-bottom: 0.5rem;
            transition: color 0.25s ease;
        }

        .recommend-card:hover .recommend-card-content h3 {
            color: var(--brand);
        }

        .recommend-card-content p {
            font-size: 0.875rem;
            color: var(--ink-muted);
            line-height: 1.65;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 1rem;
        }

        .recommend-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.5rem;
            margin-bottom: 0.875rem;
        }

        .recommend-cat {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--brand);
            background: #eff6ff;
            border-radius: 999px;
            padding: 0.2rem 0.625rem;
            white-space: nowrap;
        }

        .recommend-time {
            font-size: 0.72rem;
            color: #94a3b8;
        }

        .recommend-footer {
            margin-top: auto;
            padding-top: 0.875rem;
            border-top: 1px solid #f1f5f9;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.85rem;
            color: #94a3b8;
        }

        .recommend-footer .read-more {
            color: var(--brand);
            font-weight: 500;
            transition: gap 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
        }

        .recommend-card:hover .recommend-footer .read-more {
            gap: 0.625rem;
        }

        /* ===== Section eyebrow ===== */
        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--brand);
        }

        .section-eyebrow::before {
            content: '';
            width: 24px;
            height: 2px;
            border-radius: 999px;
            background: linear-gradient(90deg, var(--brand), var(--accent));
        }

        /* ===== CTA ===== */
        .cta-box {
            position: relative;
            overflow: hidden;
            border-radius: 1.5rem;
            background: linear-gradient(135deg, #0f172a 0%, #1d4ed8 100%);
            padding: 3rem 2rem;
            box-shadow: 0 20px 40px rgba(29, 78, 216, 0.15);
        }

        @media (min-width: 640px) {
            .cta-box {
                padding: 3.5rem 3rem;
            }
        }

        .cta-box::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.07);
        }

        .cta-box::after {
            content: '';
            position: absolute;
            bottom: -60px;
            right: 80px;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: rgba(14, 165, 233, 0.15);
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .faq-item[open] {
            border-color: #bfdbfe;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.06);
        }

        .faq-item summary {
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.15rem 1.25rem;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--ink);
            transition: color 0.25s ease;
            user-select: none;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::-moz-list-bullet {
            list-style: none;
        }

        .faq-item[open] summary {
            color: var(--brand);
        }

        .faq-item summary .fa-chevron-down {
            flex-shrink: 0;
            transition: transform 0.3s ease;
            color: var(--ink-muted);
            font-size: 0.8rem;
        }

        .faq-item[open] summary .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--brand);
        }

        .faq-answer {
            padding: 0 1.25rem 1.25rem;
            font-size: 0.9rem;
            line-height: 1.75;
            color: var(--ink-muted);
            border-top: 1px solid #f1f5f9;
            margin-top: 0;
        }

        .faq-answer::before {
            content: '';
            display: block;
            height: 1px;
            margin-bottom: 0.75rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding-top: 4rem;
            margin-top: 2rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
            padding-bottom: 3rem;
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr;
                gap: 3rem;
            }
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 0.625rem;
            font-size: 1.125rem;
            font-weight: 700;
            color: #fff;
        }

        .footer-brand .brand-icon {
            width: 2rem;
            height: 2rem;
            font-size: 0.8rem;
        }

        .footer-desc {
            font-size: 0.875rem;
            line-height: 1.75;
            color: #64748b;
            margin-top: 1rem;
            max-width: 22rem;
        }

        .footer-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: #e2e8f0;
            margin-bottom: 1rem;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.625rem;
        }

        .footer-links a {
            font-size: 0.875rem;
            color: #94a3b8;
            transition: color 0.25s ease;
        }

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

        .footer-bottom {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 1.5rem 0;
            font-size: 0.8rem;
            color: #64748b;
        }

        @media (min-width: 640px) {
            .footer-bottom {
                flex-direction: row;
                justify-content: space-between;
            }
        }

        /* ===== Empty state ===== */
        .empty-state {
            text-align: center;
            padding: 3.5rem 1rem;
        }

        .empty-state h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--ink);
        }

        .empty-state p {
            color: var(--ink-muted);
            margin-top: 0.5rem;
        }

        /* ===== Responsive adjustments ===== */
        @media (max-width: 1023px) {
            .sidebar-news-date {
                display: none;
            }
        }

        @media (max-width: 767px) {
            .article-hero-content {
                padding-top: 5rem;
                padding-bottom: 5rem;
            }

            .footer-bottom {
                text-align: center;
            }
        }