/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #C9A84C;
            --color-primary-dark: #A8882E;
            --color-primary-light: #E8D08A;
            --color-secondary: #1E3A5F;
            --color-secondary-dark: #14273E;
            --color-secondary-light: #2A5080;
            --color-accent: #D4A843;
            --color-bg: #FFFFFF;
            --color-bg-alt: #F8F6F1;
            --color-bg-dark: #1E3A5F;
            --color-bg-darker: #14273E;
            --color-text: #1A1A2E;
            --color-text-light: #4A4A5A;
            --color-text-lighter: #7A7A8A;
            --color-text-inverse: #FFFFFF;
            --color-border: #E5E0D8;
            --color-border-light: #F0EDE8;
            --color-success: #2E7D32;
            --color-warning: #F0A030;
            --color-error: #C62828;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 30px rgba(201,168,76,0.25);
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 32px;
            --spacing-xl: 64px;
            --spacing-2xl: 96px;
            --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--color-text);
            background: var(--color-bg);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; transition: var(--transition); }
        button:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius-sm); }
        input, textarea { font-family: inherit; font-size: 1rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: 12px 16px; transition: var(--transition); }
        input:focus, textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(201,168,76,0.15); }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--color-text); }
        h1 { font-size: 3rem; }
        h2 { font-size: 2.25rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.125rem; }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container--narrow { max-width: 880px; }
        .container--wide { max-width: 1400px; }

        /* ===== 辅助 ===== */
        .text-center { text-align: center; }
        .text-primary { color: var(--color-primary); }
        .text-secondary { color: var(--color-secondary); }
        .text-light { color: var(--color-text-light); }
        .text-lighter { color: var(--color-text-lighter); }
        .text-inverse { color: var(--color-text-inverse); }
        .bg-alt { background: var(--color-bg-alt); }
        .bg-dark { background: var(--color-bg-dark); color: var(--color-text-inverse); }
        .bg-darker { background: var(--color-bg-darker); color: var(--color-text-inverse); }
        .section-padding { padding: var(--spacing-xl) 0; }
        .section-padding--lg { padding: var(--spacing-2xl) 0; }
        .mt-lg { margin-top: var(--spacing-lg); }
        .mb-lg { margin-bottom: var(--spacing-lg); }
        .gap-md { gap: var(--spacing-md); }
        .gap-lg { gap: var(--spacing-lg); }

        /* ===== 分隔线 ===== */
        .divider {
            width: 60px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 2px;
            margin: var(--spacing-md) auto var(--spacing-lg);
        }
        .divider--left { margin-left: 0; }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            line-height: 1.2;
            transition: var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn--primary {
            background: var(--color-primary);
            color: var(--color-text);
            border-color: var(--color-primary);
        }
        .btn--primary:hover {
            background: var(--color-primary-dark);
            border-color: var(--color-primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
        }
        .btn--secondary {
            background: transparent;
            color: var(--color-text-inverse);
            border-color: rgba(255,255,255,0.5);
        }
        .btn--secondary:hover {
            background: rgba(255,255,255,0.1);
            border-color: var(--color-text-inverse);
            transform: translateY(-2px);
        }
        .btn--outline {
            background: transparent;
            color: var(--color-secondary);
            border-color: var(--color-secondary);
        }
        .btn--outline:hover {
            background: var(--color-secondary);
            color: var(--color-text-inverse);
            transform: translateY(-2px);
        }
        .btn--sm { padding: 10px 22px; font-size: 0.875rem; }
        .btn--lg { padding: 18px 44px; font-size: 1.125rem; }
        .btn--block { width: 100%; justify-content: center; }
        .btn:active { transform: translateY(0) scale(0.97); }

        /* ===== 标签/徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            background: var(--color-primary-light);
            color: var(--color-secondary-dark);
        }
        .badge--hot { background: #FFE0E0; color: #C62828; }
        .badge--new { background: #E0F0E8; color: #1B5E20; }
        .badge--dark { background: var(--color-secondary); color: var(--color-text-inverse); }
        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--color-bg-alt);
            color: var(--color-text-light);
            border: 1px solid var(--color-border);
        }

        /* ===== 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border-light);
            transition: var(--transition);
        }
        .header.scrolled { box-shadow: var(--shadow-md); }
        .header__inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .header__logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--color-secondary);
            letter-spacing: -0.02em;
        }
        .header__logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-text);
            font-size: 1.2rem;
            font-weight: 900;
        }
        .header__logo span { color: var(--color-primary); }
        .header__nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header__nav a {
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--color-text-light);
            transition: var(--transition);
        }
        .header__nav a:hover { color: var(--color-secondary); background: var(--color-bg-alt); }
        .header__nav a.active {
            color: var(--color-secondary);
            background: var(--color-bg-alt);
            font-weight: 600;
            position: relative;
        }
        .header__nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 1px;
        }
        .header__cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header__cta .btn { padding: 10px 24px; font-size: 0.875rem; }
        .header__menu-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--color-secondary);
            border-radius: var(--radius-sm);
        }
        .header__menu-toggle:hover { background: var(--color-bg-alt); }

        /* ===== 移动导航 ===== */
        @media (max-width: 768px) {
            .header__nav, .header__cta { display: none; }
            .header__menu-toggle { display: flex; }
            .header__nav--open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                padding: 16px 24px 24px;
                border-bottom: 1px solid var(--color-border-light);
                box-shadow: var(--shadow-md);
                gap: 4px;
            }
            .header__nav--open a { padding: 12px 18px; width: 100%; }
            .header__nav--open a.active::after { display: none; }
            .header__nav--open + .header__cta {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 240px;
                left: 0;
                width: 100%;
                padding: 0 24px 24px;
                background: rgba(255,255,255,0.98);
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: 72px;
            overflow: hidden;
            background: var(--color-bg-darker);
        }
        .hero__bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            mix-blend-mode: luminosity;
        }
        .hero__overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(20,39,62,0.88) 0%, rgba(30,58,95,0.72) 50%, rgba(20,39,62,0.88) 100%);
        }
        .hero__content {
            position: relative;
            z-index: 2;
            max-width: 780px;
            padding: var(--spacing-xl) 0;
        }
        .hero__badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 50px;
            background: rgba(201,168,76,0.18);
            border: 1px solid rgba(201,168,76,0.3);
            color: var(--color-primary-light);
            font-size: 0.8125rem;
            font-weight: 500;
            margin-bottom: var(--spacing-lg);
        }
        .hero__badge i { font-size: 0.75rem; }
        .hero__title {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--color-text-inverse);
            line-height: 1.1;
            letter-spacing: -0.02em;
            margin-bottom: var(--spacing-md);
        }
        .hero__title span { color: var(--color-primary); }
        .hero__desc {
            font-size: 1.125rem;
            color: rgba(255,255,255,0.75);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: var(--spacing-lg);
        }
        .hero__actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-md);
        }
        .hero__stats {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-lg);
            margin-top: var(--spacing-xl);
            padding-top: var(--spacing-lg);
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .hero__stat-item { text-align: left; }
        .hero__stat-number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.1;
        }
        .hero__stat-label {
            font-size: 0.8125rem;
            color: rgba(255,255,255,0.55);
            margin-top: 2px;
        }

        /* ===== 板块标题 ===== */
        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            margin-bottom: var(--spacing-sm);
        }
        .section-subtitle {
            font-size: 1.0625rem;
            color: var(--color-text-lighter);
            max-width: 560px;
        }
        .section-header {
            margin-bottom: var(--spacing-lg);
        }
        .section-header--center { text-align: center; }
        .section-header--center .section-subtitle { margin: 0 auto; }

        /* ===== 卡片 ===== */
        .card {
            background: var(--color-bg);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--color-border-light);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card__image {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: var(--color-bg-alt);
        }
        .card__image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .card:hover .card__image img { transform: scale(1.05); }
        .card__body { padding: 20px 24px 24px; }
        .card__tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.6875rem;
            font-weight: 600;
            background: var(--color-primary-light);
            color: var(--color-secondary-dark);
            margin-bottom: var(--spacing-sm);
        }
        .card__title {
            font-size: 1.125rem;
            font-weight: 700;
            margin-bottom: var(--spacing-sm);
            line-height: 1.3;
        }
        .card__title a:hover { color: var(--color-primary); }
        .card__desc {
            font-size: 0.875rem;
            color: var(--color-text-lighter);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card__meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: var(--spacing-md);
            font-size: 0.8125rem;
            color: var(--color-text-lighter);
        }
        .card__meta i { font-size: 0.75rem; margin-right: 4px; }

        /* ===== 特性卡片 ===== */
        .feature-card {
            text-align: center;
            padding: 36px 28px;
            border-radius: var(--radius-md);
            background: var(--color-bg);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--color-primary-light);
        }
        .feature-card__icon {
            width: 64px;
            height: 64px;
            margin: 0 auto var(--spacing-md);
            background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--color-text);
        }
        .feature-card__title {
            font-size: 1.125rem;
            font-weight: 700;
            margin-bottom: var(--spacing-sm);
        }
        .feature-card__desc {
            font-size: 0.875rem;
            color: var(--color-text-lighter);
            line-height: 1.7;
        }

        /* ===== 分类卡片 ===== */
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            aspect-ratio: 4 / 3;
            display: flex;
            align-items: flex-end;
            transition: var(--transition);
            border: 1px solid var(--color-border-light);
        }
        .category-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .category-card__bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            transition: var(--transition);
        }
        .category-card:hover .category-card__bg { transform: scale(1.06); }
        .category-card__overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(transparent 50%, rgba(26,26,46,0.85));
        }
        .category-card__body {
            position: relative;
            z-index: 2;
            padding: 24px;
            width: 100%;
        }
        .category-card__title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text-inverse);
            margin-bottom: 4px;
        }
        .category-card__desc {
            font-size: 0.8125rem;
            color: rgba(255,255,255,0.7);
        }
        .category-card__count {
            position: absolute;
            top: 16px;
            right: 16px;
            background: rgba(201,168,76,0.9);
            color: var(--color-text);
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.6875rem;
            font-weight: 700;
            z-index: 3;
        }

        /* ===== 流程步骤 ===== */
        .step-card {
            display: flex;
            gap: 20px;
            padding: 24px;
            border-radius: var(--radius-md);
            background: var(--color-bg);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
        }
        .step-card:hover { box-shadow: var(--shadow-md); }
        .step-card__number {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--color-primary);
            color: var(--color-text);
            font-weight: 800;
            font-size: 1.125rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .step-card__content { flex: 1; }
        .step-card__title {
            font-size: 1.0625rem;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .step-card__desc {
            font-size: 0.875rem;
            color: var(--color-text-lighter);
            line-height: 1.6;
        }

        /* ===== 数据统计 ===== */
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-lg);
        }
        .stat-item {
            text-align: center;
            padding: 32px 16px;
            border-radius: var(--radius-md);
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.08);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255,255,255,0.08);
            transform: translateY(-2px);
        }
        .stat-item__number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.1;
        }
        .stat-item__label {
            font-size: 0.875rem;
            color: rgba(255,255,255,0.6);
            margin-top: 6px;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border-bottom: 1px solid var(--color-border-light);
            padding: 20px 0;
        }
        .faq-item:first-child { padding-top: 0; }
        .faq-item__question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 1.0625rem;
            font-weight: 600;
            color: var(--color-text);
            cursor: pointer;
            padding: 4px 0;
            transition: var(--transition);
        }
        .faq-item__question:hover { color: var(--color-primary); }
        .faq-item__question i {
            font-size: 0.875rem;
            color: var(--color-text-lighter);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item__question.open i { transform: rotate(180deg); color: var(--color-primary); }
        .faq-item__answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--color-text-lighter);
            font-size: 0.9375rem;
            line-height: 1.7;
        }
        .faq-item__answer.open {
            max-height: 400px;
            padding-top: 12px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-secondary-dark), var(--color-secondary));
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section__inner {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: var(--spacing-2xl) 0;
        }
        .cta-section__title {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--color-text-inverse);
            margin-bottom: var(--spacing-md);
        }
        .cta-section__desc {
            font-size: 1.0625rem;
            color: rgba(255,255,255,0.7);
            max-width: 560px;
            margin: 0 auto var(--spacing-lg);
        }

        /* ===== 列表 ===== */
        .list-card {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid var(--color-border-light);
            transition: var(--transition);
        }
        .list-card:last-child { border-bottom: none; }
        .list-card:hover { padding-left: 8px; }
        .list-card__index {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--color-bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.8125rem;
            color: var(--color-text-lighter);
        }
        .list-card__index.top { background: var(--color-primary); color: var(--color-text); }
        .list-card__content { flex: 1; }
        .list-card__title {
            font-weight: 600;
            font-size: 0.9375rem;
            margin-bottom: 2px;
        }
        .list-card__title a:hover { color: var(--color-primary); }
        .list-card__meta {
            font-size: 0.75rem;
            color: var(--color-text-lighter);
        }

        /* ===== 图文区块 ===== */
        .media-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .media-block__image {
            border-radius: var(--radius-md);
            overflow: hidden;
            aspect-ratio: 4 / 3;
            background: var(--color-bg-alt);
        }
        .media-block__image img { width: 100%; height: 100%; object-fit: cover; }
        .media-block__content { }
        .media-block__label {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--color-primary-light);
            color: var(--color-secondary-dark);
            margin-bottom: var(--spacing-sm);
        }
        .media-block__title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: var(--spacing-sm);
        }
        .media-block__desc {
            font-size: 0.9375rem;
            color: var(--color-text-lighter);
            line-height: 1.7;
            margin-bottom: var(--spacing-md);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--color-bg-darker);
            color: rgba(255,255,255,0.65);
            padding: var(--spacing-xl) 0 var(--spacing-lg);
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            padding-bottom: var(--spacing-lg);
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer__brand .header__logo { color: var(--color-text-inverse); }
        .footer__brand .header__logo-icon { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); }
        .footer__brand-desc {
            font-size: 0.875rem;
            line-height: 1.7;
            margin-top: var(--spacing-md);
            max-width: 320px;
            color: rgba(255,255,255,0.5);
        }
        .footer__heading {
            font-size: 0.875rem;
            font-weight: 700;
            color: var(--color-text-inverse);
            margin-bottom: var(--spacing-md);
            letter-spacing: 0.02em;
        }
        .footer__links { display: flex; flex-direction: column; gap: 10px; }
        .footer__links a {
            font-size: 0.8125rem;
            color: rgba(255,255,255,0.5);
            transition: var(--transition);
        }
        .footer__links a:hover { color: var(--color-primary); padding-left: 4px; }
        .footer__social {
            display: flex;
            gap: 12px;
            margin-top: var(--spacing-md);
        }
        .footer__social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.5);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer__social a:hover { background: var(--color-primary); color: var(--color-text); }
        .footer__bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            padding-top: var(--spacing-lg);
            font-size: 0.8125rem;
            color: rgba(255,255,255,0.35);
        }

        /* ===== 网格系统 ===== */
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-lg); }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-lg); }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-lg); }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 48px 24px;
            color: var(--color-text-lighter);
        }
        .empty-state i { font-size: 2rem; margin-bottom: var(--spacing-md); opacity: 0.5; }
        .empty-state p { font-size: 0.9375rem; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .stat-grid { grid-template-columns: repeat(2, 1fr); }
            .media-block { gap: 32px; }
        }

        @media (max-width: 768px) {
            h1 { font-size: 2.25rem; }
            h2 { font-size: 1.75rem; }
            .section-title { font-size: 1.75rem; }
            .hero__title { font-size: 2.25rem; }
            .hero__desc { font-size: 1rem; }
            .hero__stats { gap: var(--spacing-md); }
            .hero__stat-number { font-size: 1.5rem; }
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
            .media-block { grid-template-columns: 1fr; gap: 24px; }
            .media-block__image { aspect-ratio: 16 / 10; }
            .stat-grid { grid-template-columns: repeat(2, 1fr); gap: var(--spacing-md); }
            .stat-item { padding: 24px 12px; }
            .stat-item__number { font-size: 2rem; }
            .cta-section__title { font-size: 1.75rem; }
            .section-padding { padding: 48px 0; }
            .section-padding--lg { padding: 64px 0; }
            .header__inner { height: 64px; }
            .hero { min-height: 80vh; padding-top: 64px; }
            .step-card { flex-direction: column; align-items: flex-start; gap: 12px; }
            .footer__grid { grid-template-columns: 1fr; gap: 24px; }
            .footer__bottom { flex-direction: column; text-align: center; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero__title { font-size: 1.75rem; }
            .hero__actions { flex-direction: column; width: 100%; }
            .hero__actions .btn { width: 100%; justify-content: center; }
            .hero__stats { flex-direction: column; gap: var(--spacing-sm); }
            .stat-grid { grid-template-columns: 1fr 1fr; }
            .card__body { padding: 16px; }
            .feature-card { padding: 24px 16px; }
            .category-card { aspect-ratio: 3 / 2; }
            .cta-section__title { font-size: 1.5rem; }
            .stat-item__number { font-size: 1.5rem; }
        }

        /* ===== 动画 ===== */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-in {
            animation: fadeInUp 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; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #c0392b;
            --primary-dark: #a93226;
            --primary-light: #e74c3c;
            --secondary: #f39c12;
            --secondary-light: #f1c40f;
            --accent: #2c3e50;
            --bg-body: #f8f4f0;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --bg-section-alt: #f0ebe6;
            --text-primary: #1e1e2a;
            --text-body: #3a3a4a;
            --text-muted: #7a7a8a;
            --text-light: #fafafa;
            --border-color: #e0d8d0;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.10);
            --shadow-hover: 0 12px 36px rgba(192, 57, 43, 0.18);
            --transition: all 0.30s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
            --spacer-section: 80px;
            --spacer-block: 48px;
        }

        /* ===== 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(--text-body);
            background: 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(--primary-dark);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-primary);
            line-height: 1.25;
            font-weight: 700;
            letter-spacing: -0.02em;
        }
        h1 {
            font-size: clamp(2.2rem, 5.5vw, 3.6rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.6vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.4vw, 1.6rem);
        }
        p {
            margin-bottom: 1rem;
        }
        p:last-child {
            margin-bottom: 0;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(224, 216, 208, 0.40);
            height: var(--header-height);
            transition: var(--transition);
        }
        .header__inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-height);
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .header__logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.03em;
            text-decoration: none;
        }
        .header__logo:hover {
            color: var(--primary);
        }
        .header__logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .header__nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header__nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            transition: var(--transition);
            position: relative;
            text-decoration: none;
        }
        .header__nav a:hover {
            background: rgba(192, 57, 43, 0.06);
            color: var(--primary);
        }
        .header__nav a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(192, 57, 43, 0.30);
        }
        .header__nav a.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }
        .header__cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--secondary);
            color: #1e1e2a;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
            margin-left: 12px;
        }
        .header__cta:hover {
            background: var(--secondary-light);
            color: #1e1e2a;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(243, 156, 18, 0.35);
        }
        .header__toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .header__toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: var(--transition);
        }

        /* ===== Hero / 分类横幅 ===== */
        .category-hero {
            padding: calc(var(--header-height) + 60px) 0 60px;
            background: linear-gradient(135deg, #1a1a2e 0%, #2c3e50 50%, #1a1a2e 100%);
            position: relative;
            overflow: hidden;
            min-height: 380px;
            display: flex;
            align-items: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(192, 57, 43, 0.25) 0%, transparent 70%);
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-hero__badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            background: rgba(243, 156, 18, 0.20);
            border: 1px solid rgba(243, 156, 18, 0.30);
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .category-hero h1 {
            color: #fff;
            font-weight: 800;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.30);
        }
        .category-hero p {
            color: rgba(255, 255, 255, 0.80);
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .category-hero__actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 1rem;
            transition: var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 24px rgba(192, 57, 43, 0.30);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(192, 57, 43, 0.40);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.35);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.10);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.60);
            transform: translateY(-3px);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: var(--spacer-section) 0;
        }
        .section--alt {
            background: var(--bg-section-alt);
        }
        .section--dark {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.85);
        }
        .section--dark h2,
        .section--dark h3 {
            color: #fff;
        }
        .section__header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto var(--spacer-block);
        }
        .section__header h2 {
            margin-bottom: 12px;
        }
        .section__header p {
            color: var(--text-muted);
            font-size: 1.05rem;
        }
        .section--dark .section__header p {
            color: rgba(255, 255, 255, 0.65);
        }
        .section__tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            background: rgba(192, 57, 43, 0.10);
            border-radius: 50px;
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .section--dark .section__tag {
            background: rgba(243, 156, 18, 0.15);
            color: var(--secondary);
        }

        /* ===== 方法卡片 ===== */
        .method-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 28px;
        }
        .method-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 26px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .method-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary);
            opacity: 0;
            transition: var(--transition);
        }
        .method-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
            border-color: rgba(192, 57, 43, 0.20);
        }
        .method-card:hover::before {
            opacity: 1;
        }
        .method-card__icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(192, 57, 43, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 18px;
            transition: var(--transition);
        }
        .method-card:hover .method-card__icon {
            background: var(--primary);
            color: #fff;
        }
        .method-card h3 {
            margin-bottom: 10px;
            font-size: 1.2rem;
        }
        .method-card p {
            font-size: 0.94rem;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .method-card .badge {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(243, 156, 18, 0.12);
            color: var(--secondary);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-top: 14px;
        }

        /* ===== 数据指标 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .stat-card__number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 4px;
        }
        .stat-card__label {
            font-size: 0.92rem;
            color: var(--text-muted);
            font-weight: 500;
        }
        .stat-card__desc {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-top: 8px;
            border-top: 1px solid var(--border-color);
            padding-top: 8px;
        }

        /* ===== 案例分析 ===== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 28px;
        }
        .case-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .case-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }
        .case-card__img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: #e8e0d8;
        }
        .case-card__body {
            padding: 24px 22px;
        }
        .case-card__tag {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(192, 57, 43, 0.08);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .case-card h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .case-card p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .case-card__meta {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-top: 14px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .case-card__meta i {
            width: 16px;
            color: var(--primary);
        }

        /* ===== 流程步骤 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step {
            text-align: center;
            position: relative;
            padding-top: 20px;
        }
        .step::before {
            counter-increment: step;
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.4rem;
            font-weight: 800;
            margin: 0 auto 18px;
            box-shadow: 0 4px 16px rgba(192, 57, 43, 0.25);
        }
        .step h4 {
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .step p {
            font-size: 0.90rem;
            color: var(--text-muted);
            max-width: 240px;
            margin: 0 auto;
        }
        .section--dark .step p {
            color: rgba(255, 255, 255, 0.65);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(192, 57, 43, 0.20);
        }
        .faq-item__question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            transition: var(--transition);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-item__question:hover {
            color: var(--primary);
        }
        .faq-item__question i {
            transition: var(--transition);
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .faq-item.active .faq-item__question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item__answer {
            padding: 0 22px 18px;
            font-size: 0.94rem;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-item__answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 70px 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: #fff;
            font-weight: 800;
            margin-bottom: 14px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.08rem;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-primary {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.20);
        }
        .cta-section .btn-primary:hover {
            background: var(--secondary);
            color: #1e1e2a;
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.30);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 28px;
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer__brand .header__logo {
            color: #fff;
            margin-bottom: 14px;
        }
        .footer__brand .header__logo:hover {
            color: var(--secondary);
        }
        .footer__brand-desc {
            font-size: 0.90rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.60);
            max-width: 320px;
            margin-bottom: 18px;
        }
        .footer__social {
            display: flex;
            gap: 14px;
        }
        .footer__social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            color: rgba(255, 255, 255, 0.65);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .footer__social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer__heading {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.2px;
        }
        .footer__links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer__links a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.90rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer__links a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }
        .footer__bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.84rem;
            color: rgba(255, 255, 255, 0.40);
            gap: 12px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacer-section: 52px;
                --spacer-block: 32px;
            }
            .header__nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 18px 24px 24px;
                gap: 6px;
                box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 1px solid var(--border-color);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .header__nav.open {
                transform: translateY(0);
                opacity: 1;
            }
            .header__nav a {
                width: 100%;
                justify-content: center;
                padding: 12px 18px;
            }
            .header__cta {
                width: 100%;
                justify-content: center;
                margin-left: 0;
                margin-top: 6px;
            }
            .header__toggle {
                display: flex;
            }
            .category-hero {
                min-height: 300px;
                padding: calc(var(--header-height) + 40px) 0 40px;
            }
            .category-hero h1 {
                font-size: 1.8rem;
            }
            .category-hero p {
                font-size: 1rem;
            }
            .method-grid,
            .case-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps {
                grid-template-columns: 1fr 1fr;
            }
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer__bottom {
                flex-direction: column;
                text-align: center;
                gap: 6px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card__number {
                font-size: 1.8rem;
            }
            .steps {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .category-hero__actions .btn {
                padding: 12px 24px;
                font-size: 0.90rem;
            }
            .section__header p {
                font-size: 0.95rem;
            }
            .faq-item__question {
                font-size: 0.92rem;
                padding: 14px 16px;
            }
            .faq-item__answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }
        }

        /* ===== 辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 8px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .gap-1 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a4a;
            --primary-light: #2c4068;
            --primary-dark: #0f1a30;
            --accent: #d4a843;
            --accent-light: #e8c36a;
            --accent-dark: #b88e30;
            --bg-light: #f5f7fa;
            --bg-white: #ffffff;
            --bg-dark: #1a2a4a;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8a8aaa;
            --text-white: #ffffff;
            --border-color: #e2e6f0;
            --border-radius: 12px;
            --border-radius-sm: 8px;
            --border-radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 74, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 42, 74, 0.10);
            --shadow-lg: 0 20px 50px rgba(26, 42, 74, 0.14);
            --shadow-accent: 0 4px 20px rgba(212, 168, 67, 0.30);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, 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-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-light);
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--border-radius-sm); }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(26, 42, 74, 0.95);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            height: var(--header-height);
            transition: var(--transition);
        }
        .header.scrolled {
            background: rgba(26, 42, 74, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.20);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header__logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: 1px;
        }
        .header__logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            border-radius: 10px;
            font-size: 20px;
            color: var(--primary-dark);
            font-weight: 900;
            box-shadow: 0 2px 12px rgba(212, 168, 67, 0.35);
        }
        .header__nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .header__nav a {
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            transition: var(--transition);
            position: relative;
        }
        .header__nav a:hover {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.08);
        }
        .header__nav a.active {
            color: var(--text-white);
            background: rgba(212, 168, 67, 0.20);
            box-shadow: inset 0 0 0 1px rgba(212, 168, 67, 0.25);
        }
        .header__cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--primary-dark);
            font-weight: 700;
            border-radius: 50px;
            font-size: 14px;
            transition: var(--transition);
            box-shadow: var(--shadow-accent);
            border: none;
            cursor: pointer;
        }
        .header__cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(212, 168, 67, 0.40);
        }
        .header__cta i { font-size: 16px; }

        /* Mobile Menu Toggle */
        .header__toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 28px;
            cursor: pointer;
            padding: 4px;
        }

        /* ===== Hero / Article Header ===== */
        .article-hero {
            padding-top: calc(var(--header-height) + 40px);
            padding-bottom: 60px;
            position: relative;
            background: var(--primary-dark);
            min-height: 340px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .article-hero__bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.30;
            transform: scale(1.05);
            transition: transform 8s ease;
        }
        .article-hero:hover .article-hero__bg {
            transform: scale(1.0);
        }
        .article-hero__overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 42, 74, 0.92) 0%, rgba(15, 26, 48, 0.80) 100%);
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .article-hero__category {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(212, 168, 67, 0.20);
            border: 1px solid rgba(212, 168, 67, 0.30);
            border-radius: 50px;
            color: var(--accent-light);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
            text-transform: uppercase;
        }
        .article-hero__title {
            font-size: 38px;
            font-weight: 800;
            color: var(--text-white);
            max-width: 840px;
            margin: 0 auto 16px;
            line-height: 1.25;
            letter-spacing: -0.3px;
        }
        .article-hero__meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            flex-wrap: wrap;
        }
        .article-hero__meta i {
            margin-right: 6px;
            color: var(--accent);
        }
        .article-hero__desc {
            max-width: 680px;
            margin: 20px auto 0;
            color: rgba(255, 255, 255, 0.70);
            font-size: 16px;
            line-height: 1.7;
        }

        /* ===== Article Body ===== */
        .article-body {
            padding: 60px 0;
            background: var(--bg-white);
        }
        .article-body .container {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        .article-body__content {
            font-size: 17px;
            line-height: 1.9;
            color: var(--text-primary);
        }
        .article-body__content p {
            margin-bottom: 20px;
        }
        .article-body__content h2,
        .article-body__content h3 {
            margin-top: 36px;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .article-body__content h2 { font-size: 26px; }
        .article-body__content h3 { font-size: 21px; }
        .article-body__content ul,
        .article-body__content ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-body__content ul li {
            list-style: disc;
            margin-bottom: 6px;
        }
        .article-body__content ol li {
            list-style: decimal;
            margin-bottom: 6px;
        }
        .article-body__content img {
            margin: 28px 0;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-md);
            width: 100%;
            height: auto;
        }
        .article-body__content blockquote {
            margin: 24px 0;
            padding: 20px 28px;
            background: var(--bg-light);
            border-left: 4px solid var(--accent);
            border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body__content a {
            color: var(--accent-dark);
            border-bottom: 1px solid transparent;
        }
        .article-body__content a:hover {
            border-bottom-color: var(--accent-dark);
        }

        /* Sidebar */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-light);
            border-radius: var(--border-radius);
            padding: 28px 24px;
            border: 1px solid var(--border-color);
        }
        .sidebar-card__title {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-card__title i {
            color: var(--accent);
            font-size: 20px;
        }
        .sidebar-card__list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .sidebar-card__list a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            background: var(--bg-white);
            border-radius: var(--border-radius-sm);
            font-size: 14px;
            color: var(--text-secondary);
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .sidebar-card__list a:hover {
            background: var(--bg-white);
            border-color: var(--accent);
            color: var(--primary);
            transform: translateX(4px);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card__list a i {
            color: var(--accent);
            font-size: 14px;
            width: 20px;
            text-align: center;
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--border-radius);
            padding: 32px 24px;
            text-align: center;
            color: var(--text-white);
        }
        .sidebar-cta h4 {
            color: var(--text-white);
            font-size: 20px;
            margin-bottom: 12px;
        }
        .sidebar-cta p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 20px;
        }
        .sidebar-cta .header__cta {
            background: var(--accent);
            color: var(--primary-dark);
        }

        /* ===== Article Meta Bar ===== */
        .article-meta-bar {
            padding: 30px 0 0;
            border-top: 1px solid var(--border-color);
            margin-top: 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags a {
            display: inline-block;
            padding: 4px 14px;
            background: var(--bg-light);
            border-radius: 50px;
            font-size: 13px;
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .article-tags a:hover {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-muted);
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-light);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .article-share a:hover {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
            transform: translateY(-2px);
        }

        /* ===== Article Navigation ===== */
        .article-nav {
            padding: 40px 0;
            background: var(--bg-light);
        }
        .article-nav__grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .article-nav__item {
            padding: 24px;
            background: var(--bg-white);
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .article-nav__item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .article-nav__label {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-nav__label i { color: var(--accent); }
        .article-nav__title {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
        }
        .article-nav__item--next {
            text-align: right;
        }
        .article-nav__item--next .article-nav__label {
            justify-content: flex-end;
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg-white);
        }
        .section-title {
            font-size: 30px;
            font-weight: 800;
            color: var(--primary);
            text-align: center;
            margin-bottom: 12px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            font-size: 16px;
            margin-bottom: 40px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-light);
            border-radius: var(--border-radius);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent);
        }
        .related-card__img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card__body {
            padding: 20px;
        }
        .related-card__tag {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(212, 168, 67, 0.15);
            color: var(--accent-dark);
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .related-card__title {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card__desc {
            font-size: 14px;
            color: var(--text-secondary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            padding: 60px 0;
            background: var(--bg-light);
        }
        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            overflow: hidden;
        }
        .faq-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }
        .faq-item__question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-primary);
            gap: 16px;
            user-select: none;
        }
        .faq-item__question i {
            color: var(--accent);
            transition: var(--transition);
            font-size: 18px;
        }
        .faq-item.active .faq-item__question i {
            transform: rotate(180deg);
        }
        .faq-item__answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }
        .faq-item.active .faq-item__answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.70);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-section .header__cta {
            font-size: 16px;
            padding: 14px 36px;
        }
        .cta-section .header__cta:hover {
            transform: translateY(-3px) scale(1.02);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer__brand .header__logo {
            margin-bottom: 16px;
        }
        .footer__brand-desc {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.8;
            max-width: 320px;
        }
        .footer__social {
            display: flex;
            gap: 12px;
            margin-top: 20px;
        }
        .footer__social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.60);
            font-size: 18px;
            transition: var(--transition);
        }
        .footer__social a:hover {
            background: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-3px);
        }
        .footer__heading {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .footer__links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer__links a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
        }
        .footer__links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer__bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.40);
        }
        .footer__bottom a {
            color: rgba(255, 255, 255, 0.50);
        }
        .footer__bottom a:hover {
            color: var(--accent);
        }

        /* ===== Not Found ===== */
        .not-found {
            padding: 100px 0;
            text-align: center;
            background: var(--bg-white);
        }
        .not-found__icon {
            font-size: 64px;
            color: var(--accent);
            margin-bottom: 24px;
        }
        .not-found h2 {
            font-size: 28px;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .not-found p {
            color: var(--text-muted);
            font-size: 16px;
            margin-bottom: 24px;
        }
        .not-found .header__cta {
            display: inline-flex;
        }

        /* ===== Error State ===== */
        .article-body__error {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-body .container {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .sidebar-cta {
                grid-column: 1 / -1;
            }
            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root { --header-height: 64px; }
            .container { padding: 0 16px; }

            .header__toggle {
                display: block;
            }
            .header__nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(26, 42, 74, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                box-shadow: var(--shadow-lg);
                pointer-events: none;
            }
            .header__nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .header__nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
                border-radius: var(--border-radius-sm);
            }
            .header__cta {
                display: none;
            }
            .header__nav .header__cta-mobile {
                display: flex;
                margin-top: 8px;
                width: 100%;
                justify-content: center;
            }

            .article-hero {
                min-height: 280px;
                padding-top: calc(var(--header-height) + 24px);
                padding-bottom: 40px;
            }
            .article-hero__title {
                font-size: 26px;
            }
            .article-hero__meta {
                gap: 12px;
                font-size: 13px;
                flex-direction: column;
                align-items: center;
            }

            .article-body {
                padding: 40px 0;
            }
            .article-body__content {
                font-size: 16px;
            }
            .article-body__content h2 { font-size: 22px; }
            .article-body__content h3 { font-size: 18px; }

            .article-sidebar {
                grid-template-columns: 1fr;
            }

            .article-nav__grid {
                grid-template-columns: 1fr;
            }
            .article-nav__item--next {
                text-align: left;
            }
            .article-nav__item--next .article-nav__label {
                justify-content: flex-start;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 24px;
            }

            .faq-item__question {
                font-size: 15px;
                padding: 16px 18px;
            }

            .cta-section {
                padding: 60px 0;
            }
            .cta-section h2 {
                font-size: 26px;
            }

            .footer__grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer__bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .article-hero__title {
                font-size: 22px;
            }
            .article-hero__desc {
                font-size: 14px;
            }
            .article-body__content {
                font-size: 15px;
            }
            .article-body__content h2 { font-size: 20px; }
            .article-body__content h3 { font-size: 17px; }
            .not-found h2 {
                font-size: 22px;
            }
            .header__logo {
                font-size: 20px;
            }
            .header__logo-icon {
                width: 34px;
                height: 34px;
                font-size: 16px;
            }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-20 { margin-top: 20px; }
        .mb-20 { margin-bottom: 20px; }
        .gap-12 { gap: 12px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }