/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f2b4a;
            --primary-light: #1a3f66;
            --primary-dark: #0a1f36;
            --accent: #d4953a;
            --accent-light: #e8b05c;
            --accent-dark: #b87a2a;
            --bg-body: #f5f7fa;
            --bg-white: #ffffff;
            --bg-light: #eef1f5;
            --bg-dark: #0a1f36;
            --text-primary: #1a1a2e;
            --text-secondary: #4a5568;
            --text-muted: #8896a6;
            --text-white: #f8f9fa;
            --border: #e2e6ec;
            --border-light: #f0f2f5;
            --shadow-sm: 0 2px 8px rgba(15, 43, 74, 0.06);
            --shadow-md: 0 8px 24px rgba(15, 43, 74, 0.10);
            --shadow-lg: 0 16px 48px rgba(15, 43, 74, 0.14);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: all 0.25s ease;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text-primary);
            background-color: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2.2rem;
        }
        h3 {
            font-size: 1.5rem;
        }
        h4 {
            font-size: 1.15rem;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container--narrow {
            max-width: 860px;
        }
        .container--wide {
            max-width: 1360px;
        }

        /* ===== 辅助 ===== */
        .section {
            padding: 80px 0;
        }
        .section--dark {
            background-color: var(--bg-dark);
            color: var(--text-white);
        }
        .section--dark h2,
        .section--dark h3,
        .section--dark .section__sub {
            color: var(--text-white);
        }
        .section--light {
            background-color: var(--bg-light);
        }
        .section--white {
            background-color: var(--bg-white);
        }
        .section__header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section__label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--accent);
            background: rgba(212, 149, 58, 0.12);
            padding: 4px 16px;
            border-radius: 50px;
            margin-bottom: 14px;
        }
        .section__title {
            font-size: 2.2rem;
            margin-bottom: 12px;
        }
        .section__sub {
            font-size: 1.08rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .section--dark .section__sub {
            color: rgba(255, 255, 255, 0.75);
        }

        /* ===== Button ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 32px;
            font-size: 0.98rem;
            font-weight: 600;
            line-height: 1.4;
            border-radius: 50px;
            transition: var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn--primary {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn--primary:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(212, 149, 58, 0.35);
        }
        .btn--outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn--outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn--outline-light {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.6);
        }
        .btn--outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn--lg {
            padding: 16px 44px;
            font-size: 1.08rem;
        }
        .btn--sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            transition: var(--transition);
        }
        .header--scrolled {
            box-shadow: var(--shadow-sm);
            background: rgba(255, 255, 255, 0.97);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header__logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .header__logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .header__logo:hover {
            color: var(--primary);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav__list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav__item {
            position: relative;
        }
        .nav__link {
            display: block;
            padding: 8px 16px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav__link:hover {
            color: var(--primary);
            background: rgba(15, 43, 74, 0.06);
        }
        .nav__link--active {
            color: var(--primary);
            background: rgba(15, 43, 74, 0.08);
            font-weight: 600;
        }
        .nav__link--active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }
        .nav__cta {
            padding: 8px 22px;
            background: var(--accent);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.88rem;
        }
        .nav__cta:hover {
            background: var(--accent-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(212, 149, 58, 0.3);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            cursor: pointer;
            background: none;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--primary);
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 92vh;
            display: flex;
            align-items: center;
            position: relative;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding-top: var(--nav-height);
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 31, 54, 0.88) 0%, rgba(15, 43, 74, 0.72) 60%, rgba(10, 31, 54, 0.50) 100%);
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding-top: 40px;
            padding-bottom: 60px;
        }
        .hero__badge {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--accent);
            background: rgba(212, 149, 58, 0.15);
            border: 1px solid rgba(212, 149, 58, 0.25);
            padding: 6px 22px;
            border-radius: 50px;
            margin-bottom: 24px;
            backdrop-filter: blur(4px);
        }
        .hero__title {
            font-size: 3.4rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.18;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero__title span {
            color: var(--accent);
        }
        .hero__desc {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero__actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .hero__stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            margin-top: 56px;
            flex-wrap: wrap;
        }
        .hero__stat {
            text-align: center;
        }
        .hero__stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
        }
        .hero__stat-num span {
            color: var(--accent);
        }
        .hero__stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.65);
            margin-top: 4px;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card__img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .card__body {
            padding: 24px 26px 28px;
        }
        .card__tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--accent);
            background: rgba(212, 149, 58, 0.10);
            padding: 2px 12px;
            border-radius: 50px;
            margin-bottom: 10px;
            letter-spacing: 0.3px;
        }
        .card__title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card__title a {
            color: var(--text-primary);
        }
        .card__title a:hover {
            color: var(--accent);
        }
        .card__text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card__meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 16px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .card__meta i {
            margin-right: 4px;
        }

        /* ===== 特性卡片 ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 30px 40px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            text-align: center;
            border: 1px solid var(--border-light);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
            border-color: rgba(212, 149, 58, 0.20);
        }
        .feature-card__icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: rgba(212, 149, 58, 0.10);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent);
            transition: var(--transition);
        }
        .feature-card:hover .feature-card__icon {
            background: var(--accent);
            color: #fff;
        }
        .feature-card__title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .feature-card__text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== 分类入口 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .category-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            border: 1px solid var(--border-light);
        }
        .category-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .category-card__img {
            width: 100%;
            height: 190px;
            object-fit: cover;
        }
        .category-card__body {
            padding: 24px 26px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card__title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .category-card__title a {
            color: var(--text-primary);
        }
        .category-card__title a:hover {
            color: var(--accent);
        }
        .category-card__text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
        }
        .category-card__link {
            margin-top: 16px;
            font-weight: 600;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .category-card__link i {
            font-size: 0.8rem;
            transition: var(--transition);
        }
        .category-card__link:hover i {
            transform: translateX(4px);
        }

        /* ===== 资讯列表 ===== */
        .post-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .post-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .post-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .post-card__img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .post-card__body {
            padding: 20px 22px 24px;
        }
        .post-card__cat {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--accent);
            background: rgba(212, 149, 58, 0.10);
            padding: 2px 12px;
            border-radius: 50px;
            margin-bottom: 8px;
        }
        .post-card__title {
            font-size: 1.02rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .post-card__title a {
            color: var(--text-primary);
        }
        .post-card__title a:hover {
            color: var(--accent);
        }
        .post-card__text {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card__meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 14px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== 流程 ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .process-step {
            text-align: center;
            position: relative;
            padding: 32px 20px 36px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .process-step:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .process-step::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 2.6rem;
            font-weight: 800;
            color: rgba(212, 149, 58, 0.10);
            line-height: 1;
        }
        .process-step__icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 18px;
            background: rgba(15, 43, 74, 0.06);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .process-step:hover .process-step__icon {
            background: var(--accent);
            color: #fff;
        }
        .process-step__title {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .process-step__text {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-item {
            text-align: center;
            padding: 32px 20px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(212, 149, 58, 0.25);
            transform: translateY(-3px);
        }
        .stat-item__num {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .stat-item__num span {
            color: var(--accent);
        }
        .stat-item__label {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(212, 149, 58, 0.25);
        }
        .faq-item__question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 16px;
        }
        .faq-item__question i {
            color: var(--accent);
            font-size: 0.85rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item__question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-item__question:hover {
            background: rgba(15, 43, 74, 0.02);
        }
        .faq-item__answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.75;
        }
        .faq-item__answer.open {
            max-height: 300px;
            padding: 0 24px 22px;
        }

        /* ===== CTA ===== */
        .cta {
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
            padding: 80px 0;
        }
        .cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10, 31, 54, 0.82);
            z-index: 1;
        }
        .cta .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta__title {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }
        .cta__text {
            font-size: 1.08rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .cta__actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 52px 0 32px;
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer__brand {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }
        .footer__brand i {
            color: var(--accent);
        }
        .footer__desc {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer__heading {
            font-size: 0.92rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer__links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer__links a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }
        .footer__links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer__bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer__bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer__bottom a:hover {
            color: var(--accent);
        }
        .footer__social {
            display: flex;
            gap: 14px;
        }
        .footer__social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .footer__social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.98rem;
        }
        .empty-state i {
            font-size: 2.4rem;
            margin-bottom: 12px;
            opacity: 0.4;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .hero__title {
                font-size: 2.6rem;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .post-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer__grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                background: var(--bg-white);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 16px;
                box-shadow: var(--shadow-md);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 2px solid var(--border-light);
                z-index: 999;
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav__list {
                flex-direction: column;
                width: 100%;
                gap: 4px;
            }
            .nav__link {
                padding: 12px 16px;
                width: 100%;
            }
            .nav__link--active::after {
                display: none;
            }
            .nav__cta {
                width: 100%;
                text-align: center;
                padding: 12px;
            }
            .nav-toggle {
                display: flex;
            }
            .hero__title {
                font-size: 2rem;
            }
            .hero__desc {
                font-size: 1rem;
            }
            .hero__stats {
                gap: 24px;
            }
            .hero__stat-num {
                font-size: 1.6rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .post-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .section {
                padding: 56px 0;
            }
            .section__header {
                margin-bottom: 36px;
            }
            .section__title {
                font-size: 1.6rem;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .cta__title {
                font-size: 1.5rem;
            }
            .footer__bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .hero__title {
                font-size: 1.6rem;
            }
            .hero__stats {
                flex-direction: column;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item__num {
                font-size: 1.6rem;
            }
            .btn--lg {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
            .feature-card {
                padding: 24px 18px 28px;
            }
            .card__body {
                padding: 18px 18px 22px;
            }
        }

        /* ===== 动画 ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-up {
            animation: fadeUp 0.6s ease forwards;
        }
        .delay-1 {
            animation-delay: 0.1s;
        }
        .delay-2 {
            animation-delay: 0.2s;
        }
        .delay-3 {
            animation-delay: 0.3s;
        }

        /* ===== 辅助工具 ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e40af;
            --primary-bg: #eff6ff;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --accent-dark: #d97706;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-light: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-btn: 0 4px 14px rgba(26,86,219,0.30);
            --transition: 0.25s ease;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset / Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: var(--font);
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary-light); outline-offset: 2px; border-radius: 4px; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: 1rem; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.25rem; }
        h2 { font-size: 1.75rem; }
        h3 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        .header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.06); }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100%;
            position: relative;
        }
        .header__logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: -0.3px;
            position: absolute;
            left: 20px;
            top: 50%;
            transform: translateY(-50%);
        }
        .header__logo i { font-size: 1.5rem; color: var(--primary); }
        .header__logo:hover { color: var(--primary-dark); }

        .nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav__list {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav__link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            padding: 6px 0;
            position: relative;
            transition: color var(--transition);
        }
        .nav__link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: width var(--transition);
        }
        .nav__link:hover { color: var(--primary); }
        .nav__link:hover::after { width: 100%; }
        .nav__link--active { color: var(--primary); font-weight: 600; }
        .nav__link--active::after { width: 100%; }
        .nav__cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 22px;
            background: var(--primary);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: var(--shadow-btn);
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
        }
        .nav__cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(26,86,219,0.35); }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== 文章 Banner ===== */
        .article-banner {
            padding: 120px 0 60px;
            background: var(--bg-alt);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.70) 0%, rgba(15,23,42,0.30) 100%);
        }
        .article-banner .container { position: relative; z-index: 1; }
        .article-banner__meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 20px;
            margin-bottom: 16px;
        }
        .article-banner__category {
            display: inline-block;
            padding: 4px 16px;
            background: var(--primary);
            color: #fff;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 50px;
            letter-spacing: 0.3px;
        }
        .article-banner__date {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.80);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-banner__date i { font-size: 0.85rem; }
        .article-banner__title {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            max-width: 860px;
            line-height: 1.25;
            text-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .article-banner__desc {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.90);
            max-width: 680px;
            margin-top: 12px;
            line-height: 1.6;
        }

        /* ===== 文章正文 ===== */
        .article-main {
            padding: 50px 0 70px;
            background: var(--bg);
        }
        .article-main .container {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-content {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .article-content h2 {
            font-size: 1.6rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: var(--text);
            border-left: 4px solid var(--primary);
            padding-left: 16px;
        }
        .article-content h3 {
            font-size: 1.2rem;
            margin-top: 1.6rem;
            margin-bottom: 0.6rem;
            color: var(--text);
        }
        .article-content p {
            margin-bottom: 1.2rem;
            color: var(--text-light);
            line-height: 1.8;
        }
        .article-content ul, .article-content ol {
            margin-bottom: 1.2rem;
            padding-left: 1.6rem;
            color: var(--text-light);
        }
        .article-content ul li { list-style: disc; margin-bottom: 0.4rem; }
        .article-content ol li { list-style: decimal; margin-bottom: 0.4rem; }
        .article-content a { color: var(--primary); font-weight: 500; border-bottom: 1px dashed var(--primary-light); }
        .article-content a:hover { border-bottom-style: solid; }
        .article-content img { border-radius: var(--radius); margin: 1.5rem 0; box-shadow: var(--shadow); }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 24px;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-content .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border);
        }
        .article-content .article-tags span {
            display: inline-block;
            padding: 4px 14px;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: 50px;
            font-size: 0.8rem;
            color: var(--text-light);
            transition: var(--transition);
        }
        .article-content .article-tags span:hover { background: var(--primary-bg); border-color: var(--primary-light); color: var(--primary); }

        /* ===== 侧边栏 ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 26px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-bg);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i { color: var(--primary); }
        .sidebar-list { display: flex; flex-direction: column; gap: 12px; }
        .sidebar-list a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 14px;
            background: var(--bg-alt);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            color: var(--text-light);
            transition: var(--transition);
        }
        .sidebar-list a:hover { background: var(--primary-bg); color: var(--primary); transform: translateX(4px); }
        .sidebar-list a i { color: var(--primary-light); font-size: 0.8rem; }
        .sidebar-cta {
            display: block;
            text-align: center;
            padding: 14px 20px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: var(--transition);
            box-shadow: var(--shadow-btn);
        }
        .sidebar-cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,86,219,0.35); }

        /* ===== 相关文章 ===== */
        .related-section {
            padding: 60px 0 80px;
            background: var(--bg-alt);
        }
        .related-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 32px;
            text-align: center;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; }
        .related-card__body { padding: 18px 20px 20px; }
        .related-card__body h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
        .related-card__body h3 a { color: var(--text); }
        .related-card__body h3 a:hover { color: var(--primary); }
        .related-card__body p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card__meta { font-size: 0.78rem; color: var(--text-muted); margin-top: 10px; display: flex; align-items: center; gap: 12px; }

        /* ===== 页脚 ===== */
        .footer {
            background: #0f172a;
            color: rgba(255,255,255,0.80);
            padding: 56px 0 28px;
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr 1.2fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer__brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
        }
        .footer__brand i { color: var(--primary-light); }
        .footer__desc { font-size: 0.9rem; color: rgba(255,255,255,0.60); line-height: 1.7; max-width: 280px; }
        .footer__heading {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer__links { display: flex; flex-direction: column; gap: 10px; }
        .footer__links a {
            color: rgba(255,255,255,0.60);
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer__links a:hover { color: #fff; }
        .footer__bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.45);
        }
        .footer__bottom a { color: rgba(255,255,255,0.55); }
        .footer__bottom a:hover { color: #fff; }
        .footer__social { display: flex; gap: 16px; }
        .footer__social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: rgba(255,255,255,0.06);
            border-radius: 50%;
            color: rgba(255,255,255,0.55);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer__social a:hover { background: var(--primary); color: #fff; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .article-main .container { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
            .related-grid { grid-template-columns: 1fr 1fr; }
            .footer__grid { grid-template-columns: 1fr 1fr; gap: 28px; }
        }

        @media (max-width: 768px) {
            .header .container { justify-content: space-between; }
            .header__logo { position: static; transform: none; }
            .nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                width: 100%;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 20px;
                box-shadow: 0 20px 40px rgba(0,0,0,0.08);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 2px solid var(--border);
            }
            .nav.open { transform: translateY(0); opacity: 1; }
            .nav__list { flex-direction: column; gap: 16px; width: 100%; }
            .nav__cta { width: 100%; justify-content: center; }
            .nav-toggle { display: flex; }

            .article-banner { padding: 100px 0 40px; }
            .article-banner__title { font-size: 1.6rem; }
            .article-banner__desc { font-size: 0.95rem; }
            .article-content { padding: 24px 20px; }
            .article-content h2 { font-size: 1.3rem; }

            .article-sidebar { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr; }
            .related-card img { height: 160px; }

            .footer__grid { grid-template-columns: 1fr; gap: 24px; }
            .footer__bottom { flex-direction: column; text-align: center; }
        }

        @media (max-width: 520px) {
            .article-banner__title { font-size: 1.35rem; }
            .article-content { padding: 18px 14px; }
            .article-content h2 { font-size: 1.15rem; padding-left: 12px; }
            .sidebar-card { padding: 18px 16px; }
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 60px 20px;
        }
        .not-found-box i { font-size: 3rem; color: var(--text-muted); margin-bottom: 16px; }
        .not-found-box h2 { font-size: 1.5rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 20px; }
        .not-found-box a { display: inline-block; padding: 10px 28px; background: var(--primary); color: #fff; border-radius: 50px; font-weight: 600; }
        .not-found-box a:hover { background: var(--primary-dark); color: #fff; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #0f2b4a;
            --color-primary-light: #1a3f6a;
            --color-primary-dark: #091e33;
            --color-accent: #3b82f6;
            --color-accent-hover: #2563eb;
            --color-gold: #f59e0b;
            --color-gold-light: #fbbf24;
            --color-bg: #ffffff;
            --color-bg-alt: #f8fafc;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-muted: #64748b;
            --color-text-light: #94a3b8;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-white: #ffffff;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-error: #ef4444;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(15, 43, 74, 0.08);
            --shadow-md: 0 4px 16px rgba(15, 43, 74, 0.10);
            --shadow-lg: 0 12px 40px rgba(15, 43, 74, 0.14);
            --shadow-xl: 0 24px 60px rgba(15, 43, 74, 0.18);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--color-accent-hover);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-primary);
        }
        h1 {
            font-size: clamp(2rem, 5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.5rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        h4 {
            font-size: 1.15rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--color-text);
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--color-primary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            box-shadow: 0 2px 20px rgba(15, 43, 74, 0.25);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header__logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-white);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .header__logo i {
            color: var(--color-gold);
            font-size: 1.4rem;
        }
        .header__logo:hover {
            color: var(--color-gold-light);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav__list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav__item {
            position: relative;
        }
        .nav__link {
            display: block;
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.8);
            border-radius: var(--radius-sm);
            transition: color var(--transition), background var(--transition);
        }
        .nav__link:hover {
            color: var(--color-white);
            background: rgba(255, 255, 255, 0.08);
        }
        .nav__link--active {
            color: var(--color-white);
            background: rgba(255, 255, 255, 0.12);
        }
        .nav__link--active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            background: var(--color-gold);
            border-radius: 4px;
        }
        .nav__cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--color-primary);
            background: var(--color-gold);
            border-radius: var(--radius-md);
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            white-space: nowrap;
        }
        .nav__cta:hover {
            background: var(--color-gold-light);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
            color: var(--color-primary);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: transparent;
            border: none;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 3px;
            background: var(--color-white);
            border-radius: 4px;
            transition: transform var(--transition), opacity var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* 移动端导航 */
        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                gap: 12px;
                padding: 20px 24px 28px;
                background: var(--color-primary-dark);
                border-bottom: 2px solid rgba(255, 255, 255, 0.06);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                visibility: hidden;
                transition: transform 0.35s ease, opacity 0.35s ease, visibility 0.35s;
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .nav__list {
                flex-direction: column;
                width: 100%;
                gap: 4px;
            }
            .nav__link {
                width: 100%;
                text-align: center;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav__link--active::after {
                display: none;
            }
            .nav__link--active {
                background: rgba(255, 255, 255, 0.12);
                border-left: 4px solid var(--color-gold);
            }
            .nav__cta {
                width: 100%;
                justify-content: center;
                padding: 14px 24px;
                font-size: 1rem;
            }
        }
        @media (max-width: 480px) {
            .header__logo {
                font-size: 1.05rem;
                gap: 8px;
            }
            .header__logo i {
                font-size: 1.15rem;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 100px 0 16px;
            background: var(--color-bg-alt);
            border-bottom: 1px solid var(--color-border);
        }
        .breadcrumb__inner {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--color-text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb__inner a {
            color: var(--color-text-muted);
            transition: color var(--transition);
        }
        .breadcrumb__inner a:hover {
            color: var(--color-accent);
        }
        .breadcrumb__inner span {
            color: var(--color-text);
            font-weight: 500;
        }
        .breadcrumb__inner .sep {
            color: var(--color-text-light);
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 80px 0 100px;
            background: var(--color-primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 43, 74, 0.88) 0%, rgba(15, 43, 74, 0.72) 100%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-hero__badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            background: rgba(245, 158, 11, 0.18);
            border: 1px solid rgba(245, 158, 11, 0.3);
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-gold-light);
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .page-hero__badge i {
            font-size: 0.9rem;
        }
        .page-hero h1 {
            color: var(--color-white);
            margin-bottom: 16px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .page-hero p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.8;
        }
        @media (max-width: 768px) {
            .page-hero {
                padding: 60px 0 70px;
                min-height: 240px;
            }
            .page-hero p {
                font-size: 1rem;
            }
        }

        /* ===== Section共用 ===== */
        .section {
            padding: 80px 0;
        }
        .section--alt {
            background: var(--color-bg-alt);
        }
        .section--dark {
            background: var(--color-bg-dark);
        }
        .section__header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section__header h2 {
            margin-bottom: 12px;
        }
        .section__header p {
            color: var(--color-text-muted);
            max-width: 620px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section__header .badge {
            display: inline-block;
            padding: 4px 16px;
            background: rgba(59, 130, 246, 0.10);
            border: 1px solid rgba(59, 130, 246, 0.18);
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--color-accent);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section__header {
                margin-bottom: 40px;
            }
        }

        /* ===== 登录方式卡片网格 ===== */
        .methods-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .method-card {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 36px 28px 32px;
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            position: relative;
            overflow: hidden;
        }
        .method-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--color-accent);
            opacity: 0;
            transition: opacity var(--transition);
        }
        .method-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .method-card:hover::before {
            opacity: 1;
        }
        .method-card__icon {
            width: 68px;
            height: 68px;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-size: 1.8rem;
            color: var(--color-white);
            background: var(--color-accent);
            transition: transform var(--transition);
        }
        .method-card:hover .method-card__icon {
            transform: scale(1.05);
        }
        .method-card:nth-child(1) .method-card__icon {
            background: var(--color-accent);
        }
        .method-card:nth-child(2) .method-card__icon {
            background: var(--color-gold);
        }
        .method-card:nth-child(3) .method-card__icon {
            background: var(--color-success);
        }
        .method-card h3 {
            margin-bottom: 8px;
            font-size: 1.2rem;
        }
        .method-card p {
            color: var(--color-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .method-card .tag {
            display: inline-block;
            margin-top: 14px;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(59, 130, 246, 0.08);
            color: var(--color-accent);
            border: 1px solid rgba(59, 130, 246, 0.15);
        }
        .method-card:nth-child(2) .tag {
            background: rgba(245, 158, 11, 0.08);
            color: var(--color-gold);
            border-color: rgba(245, 158, 11, 0.2);
        }
        .method-card:nth-child(3) .tag {
            background: rgba(16, 185, 129, 0.08);
            color: var(--color-success);
            border-color: rgba(16, 185, 129, 0.2);
        }
        @media (max-width: 900px) {
            .methods-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 560px) {
            .methods-grid {
                grid-template-columns: 1fr;
            }
            .method-card {
                padding: 28px 20px 24px;
            }
        }

        /* ===== 步骤流程 ===== */
        .steps-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .steps-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            background: var(--color-bg-alt);
        }
        .steps-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 280px;
        }
        .steps-list {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .step-item {
            display: flex;
            gap: 18px;
            align-items: flex-start;
        }
        .step-item__num {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--color-white);
            background: var(--color-accent);
            transition: transform var(--transition);
        }
        .step-item:hover .step-item__num {
            transform: scale(1.08);
        }
        .step-item:nth-child(2) .step-item__num {
            background: var(--color-gold);
        }
        .step-item:nth-child(3) .step-item__num {
            background: var(--color-success);
        }
        .step-item:nth-child(4) .step-item__num {
            background: var(--color-primary-light);
        }
        .step-item__content h4 {
            font-size: 1.1rem;
            margin-bottom: 4px;
        }
        .step-item__content p {
            color: var(--color-text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .steps-wrap {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .steps-image {
                order: -1;
            }
            .steps-image img {
                min-height: 200px;
            }
        }

        /* ===== 安全提示 ===== */
        .safety-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .safety-card {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            text-align: center;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .safety-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .safety-card__icon {
            font-size: 2rem;
            color: var(--color-accent);
            margin-bottom: 16px;
        }
        .safety-card:nth-child(2) .safety-card__icon {
            color: var(--color-gold);
        }
        .safety-card:nth-child(3) .safety-card__icon {
            color: var(--color-success);
        }
        .safety-card:nth-child(4) .safety-card__icon {
            color: var(--color-error);
        }
        .safety-card h4 {
            font-size: 1rem;
            margin-bottom: 8px;
        }
        .safety-card p {
            color: var(--color-text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .safety-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .safety-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item:hover {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-sm);
        }
        .faq-item__question {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--color-text);
            background: transparent;
            text-align: left;
            gap: 16px;
            transition: color var(--transition), background var(--transition);
        }
        .faq-item__question:hover {
            color: var(--color-accent);
            background: rgba(59, 130, 246, 0.02);
        }
        .faq-item__question i {
            font-size: 1rem;
            color: var(--color-text-muted);
            transition: transform var(--transition), color var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-item__question i {
            transform: rotate(180deg);
            color: var(--color-accent);
        }
        .faq-item__answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--color-text-muted);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-item__answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        @media (max-width: 768px) {
            .faq-item__question {
                padding: 16px 18px;
                font-size: 0.98rem;
            }
            .faq-item__answer {
                padding: 0 18px;
                font-size: 0.9rem;
            }
            .faq-item.active .faq-item__answer {
                padding: 0 18px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--color-primary);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 43, 74, 0.9) 0%, rgba(15, 43, 74, 0.78) 100%);
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            color: var(--color-white);
            margin-bottom: 14px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta-btns {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            border: 2px solid transparent;
        }
        .btn--primary {
            background: var(--color-gold);
            color: var(--color-primary);
            border-color: var(--color-gold);
        }
        .btn--primary:hover {
            background: var(--color-gold-light);
            border-color: var(--color-gold-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
            color: var(--color-primary);
        }
        .btn--outline {
            background: transparent;
            color: var(--color-white);
            border-color: rgba(255, 255, 255, 0.5);
        }
        .btn--outline:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: var(--color-white);
            transform: translateY(-2px);
            color: var(--color-white);
        }
        @media (max-width: 480px) {
            .btn {
                width: 100%;
                justify-content: center;
                padding: 14px 24px;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--color-primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 0;
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer__brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-white);
            margin-bottom: 14px;
        }
        .footer__brand i {
            color: var(--color-gold);
        }
        .footer__desc {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            line-height: 1.7;
            max-width: 340px;
        }
        .footer__heading {
            color: var(--color-white);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer__links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer__links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer__links a:hover {
            color: var(--color-gold-light);
            padding-left: 4px;
        }
        .footer__bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer__bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer__bottom a:hover {
            color: var(--color-gold-light);
        }
        .footer__social {
            display: flex;
            gap: 14px;
        }
        .footer__social a {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .footer__social a:hover {
            background: var(--color-gold);
            color: var(--color-primary);
            transform: translateY(-2px);
        }
        @media (max-width: 900px) {
            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 560px) {
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer__bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }

        /* ===== 访问焦点 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--color-accent);
            outline-offset: 2px;
        }

        /* ===== 动画 ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-up {
            animation: fadeUp 0.6s ease forwards;
        }
        .animate-delay-1 {
            animation-delay: 0.1s;
        }
        .animate-delay-2 {
            animation-delay: 0.2s;
        }
        .animate-delay-3 {
            animation-delay: 0.3s;
        }
        .animate-delay-4 {
            animation-delay: 0.4s;
        }