/* roulang page: index */
:root {
            --deep-wood: #3E2723;
            --warm-gold: #C9A96E;
            --ivory: #FAF7F2;
            --dark-wine: #722F37;
            --dark-brown: #2C1E16;
            --card-bg: #F5F0E8;
            --border-soft: #E0D3C0;
            --text-muted: #7A6A5C;
            --shadow-warm: 0 4px 20px rgba(62,39,35,0.08);
            --shadow-hover: 0 12px 32px rgba(62,39,35,0.14);
            --sidebar-width: 240px;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            --font-en: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
            --radius-card: 8px;
            --radius-btn: 8px;
            --radius-img: 8px;
            --transition-smooth: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--ivory);
            color: var(--dark-brown);
            line-height: 1.75;
            font-size: 16px;
            font-weight: 400;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }

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

        button, .btn {
            font-family: var(--font-sans);
        }

        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            margin-top: 0;
            color: var(--deep-wood);
            letter-spacing: -0.3px;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        h2 {
            font-size: 1.85rem;
        }

        h3 {
            font-size: 1.35rem;
        }

        .en-font {
            font-family: var(--font-en);
        }

        /* ---------- 左侧竖向导航 ---------- */
        .sidebar-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background-color: var(--deep-wood);
            z-index: 1040;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            padding: 28px 0 24px 0;
            box-shadow: 2px 0 18px rgba(0,0,0,0.08);
            transition: var(--transition-smooth);
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0 24px 28px 24px;
            border-bottom: 1px solid rgba(201,169,110,0.25);
            margin-bottom: 24px;
            width: 100%;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--warm-gold) 0%, #B8935A 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #2C1E16;
            font-size: 20px;
            font-weight: 700;
            font-family: var(--font-en);
            letter-spacing: 1px;
            box-shadow: 0 4px 12px rgba(201,169,110,0.4);
        }

        .brand-text {
            color: var(--warm-gold);
            font-size: 1.25rem;
            font-weight: 600;
            letter-spacing: 1.5px;
        }

        .nav-link-list {
            list-style: none;
            padding: 0 16px;
            margin: 0;
            width: 100%;
            flex: 1;
        }

        .nav-link-list li {
            margin-bottom: 4px;
        }

        .nav-link-list .nav-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #D7CCC0;
            padding: 12px 18px;
            border-radius: 8px;
            font-size: 0.95rem;
            font-weight: 500;
            position: relative;
            transition: var(--transition-smooth);
            white-space: nowrap;
        }

        .nav-link-list .nav-item:hover,
        .nav-link-list .nav-item.active {
            color: var(--warm-gold);
            background-color: rgba(201,169,110,0.08);
        }

        .nav-link-list .nav-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 12%;
            height: 76%;
            width: 3px;
            background-color: var(--warm-gold);
            border-radius: 0 4px 4px 0;
        }

        .nav-link-list .nav-item i {
            font-size: 1.1rem;
            width: 20px;
            text-align: center;
        }

        .sidebar-footer {
            padding: 20px 24px 8px;
            color: #9E8C7C;
            font-size: 0.8rem;
            width: 100%;
            border-top: 1px solid rgba(201,169,110,0.2);
            margin-top: 20px;
        }

        /* 主内容区偏移 */
        .main-content {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            background-color: var(--ivory);
        }

        /* 移动端导航 */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 64px;
            background-color: var(--deep-wood);
            z-index: 1050;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            box-shadow: 0 4px 14px rgba(0,0,0,0.1);
        }

        .mobile-brand {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hamburger-btn {
            background: transparent;
            border: none;
            color: var(--warm-gold);
            font-size: 1.8rem;
            cursor: pointer;
            padding: 8px;
        }

        .mobile-menu {
            position: fixed;
            top: 64px;
            left: 0;
            width: 100%;
            background-color: #2C1E16;
            z-index: 1049;
            display: none;
            flex-direction: column;
            padding: 16px 0;
            box-shadow: 0 10px 25px rgba(0,0,0,0.2);
        }

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

        .mobile-menu .nav-item {
            color: #D7CCC0;
            padding: 14px 28px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            font-size: 1rem;
            transition: var(--transition-smooth);
        }

        .mobile-menu .nav-item:hover {
            color: var(--warm-gold);
            background-color: rgba(201,169,110,0.05);
        }

        /* 容器与板块间距 */
        .container-custom {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 24px;
        }

        section {
            padding: 90px 0;
        }

        /* Hero */
        .hero-section {
            background: linear-gradient(135deg, #3E2723 0%, #4B3329 50%, #5D4037 100%);
            min-height: 85vh;
            display: flex;
            align-items: center;
            color: #FAF7F2;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            right: -10%;
            top: 15%;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(201,169,110,0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-bg-pattern {
            position: absolute;
            right: 5%;
            top: 20%;
            opacity: 0.07;
            font-size: 18rem;
            color: #C9A96E;
            font-family: var(--font-en);
            font-weight: 800;
            user-select: none;
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 700;
            color: #FFFFFF;
            letter-spacing: -0.5px;
            line-height: 1.3;
        }

        .hero-sub {
            color: #E5CFA2;
            font-size: 1.15rem;
            margin-top: 16px;
            max-width: 560px;
        }

        .btn-primary-gold {
            background-color: var(--warm-gold);
            color: #2C1E16;
            border: none;
            padding: 12px 32px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            letter-spacing: 0.8px;
            transition: var(--transition-smooth);
            box-shadow: 0 8px 18px rgba(201,169,110,0.25);
        }

        .btn-primary-gold:hover {
            background-color: var(--dark-wine);
            color: #FAF7F2;
            box-shadow: 0 12px 24px rgba(114,47,55,0.35);
            transform: translateY(-2px);
        }

        .btn-outline-gold {
            background: transparent;
            border: 1.5px solid var(--warm-gold);
            color: var(--warm-gold);
            padding: 11px 30px;
            border-radius: var(--radius-btn);
            font-weight: 500;
            transition: var(--transition-smooth);
        }

        .btn-outline-gold:hover {
            background-color: rgba(201,169,110,0.15);
            color: #FFFFFF;
            border-color: #E5CFA2;
        }

        /* 卡片通用 */
        .card-custom {
            background: var(--card-bg);
            border: 1px solid var(--border-soft);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-warm);
            transition: var(--transition-smooth);
            height: 100%;
        }

        .card-custom:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--warm-gold);
        }

        .card-img-top {
            border-radius: var(--radius-img) var(--radius-img) 0 0;
            height: 190px;
            object-fit: cover;
            width: 100%;
        }

        /* 价格卡片推荐 */
        .pricing-recommend {
            border: 2px solid var(--warm-gold);
            position: relative;
        }

        .badge-recommend {
            background-color: var(--dark-wine);
            color: #FAF7F2;
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            position: absolute;
            top: -14px;
            right: 20px;
        }

        /* FAQ */
        .accordion-button:not(.collapsed) {
            background-color: #F5F0E8;
            color: var(--warm-gold);
            box-shadow: none;
            font-weight: 600;
        }

        .accordion-button {
            background-color: var(--ivory);
            border-bottom: 1px dashed #D0C4B0;
            font-weight: 500;
            color: var(--dark-brown);
        }

        .accordion-button:focus {
            border-color: var(--warm-gold);
            box-shadow: 0 0 0 3px rgba(201,169,110,0.2);
        }

        /* CTA 横幅 */
        .cta-banner {
            background-color: var(--deep-wood);
            color: #FAF7F2;
            padding: 70px 0;
            text-align: center;
        }

        /* 页脚 */
        .footer-dark {
            background-color: #2C1E16;
            color: #BCAAA4;
            padding: 50px 0 20px;
        }

        .footer-dark a:hover {
            color: var(--warm-gold);
        }

        @media (max-width: 1024px) {
            .sidebar-nav {
                display: none;
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-nav {
                display: flex;
            }
            .hero-section {
                min-height: 70vh;
            }
            h1 {
                font-size: 2.2rem;
            }
            section {
                padding: 64px 0;
            }
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 2rem;
            }
            .card-custom {
                margin-bottom: 18px;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding: 0 16px;
            }
        }