/* roulang page: index */
:root {
            --color-primary: #3A3C42;
            --color-accent: #C49A6C;
            --color-accent-hover: #B0865A;
            --color-bg: #FAF8F5;
            --color-surface: #FFFFFF;
            --color-dark: #2A2C30;
            --color-text: #2D2F33;
            --color-text-secondary: #6B6D73;
            --color-text-muted: #9A9C9F;
            --color-border: #E8E5E0;
            --radius-card: 12px;
            --radius-button: 8px;
            --radius-dock: 40px;
            --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-card-hover: 0 6px 20px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
            --font-heading: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', Georgia, serif;
            --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --transition: all 0.25s ease;
        }

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

        body {
            font-family: var(--font-body);
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.75;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            padding-top: 100px;
        }

        h1, h2, h3, h4 {
            font-family: var(--font-heading);
            font-weight: 700;
            letter-spacing: -0.02em;
        }

        h1 {
            font-size: clamp(2.2rem, 4vw, 3.4rem);
            color: var(--color-primary);
            margin-bottom: 1.25rem;
            line-height: 1.25;
        }

        h2 {
            font-size: 2rem;
            color: var(--color-primary);
            margin-bottom: 2.5rem;
            text-align: center;
        }

        h3 {
            font-size: 1.35rem;
            color: var(--color-primary);
            margin-bottom: 0.75rem;
        }

        h4 {
            font-size: 1rem;
            color: var(--color-primary);
            margin-bottom: 1.2rem;
            letter-spacing: 0.02em;
        }

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

        a:hover {
            color: var(--color-accent-hover);
            text-decoration: none;
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .section {
            padding: 80px 0;
        }

        .section-alt {
            background-color: #F5F2ED;
        }

        .btn {
            display: inline-block;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-button);
            font-size: 0.95rem;
            transition: var(--transition);
            cursor: pointer;
            text-align: center;
            border: 2px solid transparent;
            font-family: var(--font-body);
            letter-spacing: 0.02em;
        }

        .btn-primary {
            background-color: var(--color-accent);
            color: white;
            border-color: var(--color-accent);
        }

        .btn-primary:hover {
            background-color: var(--color-accent-hover);
            border-color: var(--color-accent-hover);
            color: white;
            transform: translateY(-1px);
        }

        .btn-secondary {
            background: transparent;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        .btn-secondary:hover {
            background: rgba(58, 60, 66, 0.05);
            color: var(--color-primary);
            border-color: var(--color-primary);
            transform: translateY(-1px);
        }

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

        .btn-light:hover {
            background: rgba(255,255,255,0.1);
            border-color: white;
            color: white;
        }

        /* 浮动导航 Dock */
        .nav-dock {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 32px);
            max-width: 720px;
            background: rgba(250, 248, 245, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-radius: var(--radius-dock);
            padding: 12px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            z-index: 99;
            box-shadow: 0 4px 12px rgba(0,0,0,0.04);
            transition: var(--transition);
            border: 1px solid rgba(232, 229, 224, 0.5);
        }

        .nav-dock.scrolled {
            box-shadow: 0 8px 24px rgba(0,0,0,0.08);
            padding: 10px 28px;
        }

        .nav-logo {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--color-primary);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        .nav-links {
            display: flex;
            gap: 24px;
            list-style: none;
            margin: 0;
        }

        .nav-links a {
            color: var(--color-text-secondary);
            font-size: 0.9rem;
            font-weight: 500;
            padding: 6px 2px;
            border-bottom: 2px solid transparent;
            transition: var(--transition);
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--color-primary);
            border-bottom-color: var(--color-accent);
        }

        .nav-cta {
            background: var(--color-accent);
            color: white !important;
            padding: 8px 18px !important;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            border: none;
        }

        .nav-cta:hover {
            background: var(--color-accent-hover);
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--color-primary);
            cursor: pointer;
        }

        /* Hero */
        .hero-grid {
            display: grid;
            grid-template-columns: 6fr 4fr;
            gap: 48px;
            align-items: center;
        }

        .hero-image {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card-hover);
            position: relative;
        }

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

        .hero-image::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(196,154,108,0.15) 0%, rgba(58,60,66,0.05) 100%);
            pointer-events: none;
        }

        .scroll-indicator {
            margin-top: 40px;
            text-align: center;
            color: var(--color-text-muted);
            font-size: 0.85rem;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-6px); }
            60% { transform: translateY(-3px); }
        }

        /* 核心优势卡片 */
        .advantage-cards {
            display: grid;
            grid-template-columns: 1fr 1.2fr 1fr;
            gap: 32px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .adv-card {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            padding: 36px 28px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border-left: 3px solid transparent;
        }

        .adv-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-left-color: var(--color-accent);
            transform: translateY(-4px);
        }

        .adv-icon {
            width: 64px;
            height: 64px;
            background: rgba(196,154,108,0.12);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            color: var(--color-accent);
            font-size: 1.8rem;
        }

        /* 业务版图 */
        .biz-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            margin-bottom: 80px;
        }

        .biz-row:last-child {
            margin-bottom: 0;
        }

        .biz-img img {
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            width: 100%;
        }

        .biz-tag {
            display: inline-block;
            border: 1px solid var(--color-accent);
            color: var(--color-accent);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 16px;
        }

        .biz-num {
            font-family: var(--font-heading);
            font-size: 3rem;
            color: rgba(196,154,108,0.25);
            font-weight: 700;
            line-height: 1;
            margin-bottom: 8px;
        }

        /* 数据见证 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }

        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--color-accent);
            font-family: var(--font-heading);
            line-height: 1.2;
        }

        /* 解决方案卡片 */
        .solution-cards {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .sol-card {
            background: linear-gradient(135deg, #FFFFFF 0%, #F9F7F3 100%);
            border-radius: var(--radius-card);
            padding: 40px 32px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .sol-card:hover {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-card-hover);
        }

        .sol-list {
            list-style: none;
            margin: 20px 0;
        }

        .sol-list li {
            padding: 8px 0;
            border-bottom: 1px solid var(--color-border);
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--color-text-secondary);
        }

        .sol-list i {
            color: var(--color-accent);
            font-size: 0.8rem;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--color-border);
            cursor: pointer;
            padding: 20px 0;
        }

        .faq-question {
            display: flex;
            align-items: center;
            gap: 16px;
            font-weight: 600;
            color: var(--color-primary);
            font-size: 1.1rem;
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border: 2px solid var(--color-accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--color-accent);
            transition: transform 0.2s;
            flex-shrink: 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: var(--color-text-secondary);
            padding-left: 44px;
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding-top: 12px;
        }

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

        /* CTA 区 */
        .cta-section {
            background: linear-gradient(135deg, #2A2C30 0%, #3A3C42 100%);
            color: white;
            text-align: center;
            border-radius: var(--radius-card);
            padding: 70px 32px;
            margin: 0 32px;
        }

        .cta-section h2 {
            color: white;
            margin-bottom: 16px;
        }

        /* 页脚 */
        .footer-grid {
            display: grid;
            grid-template-columns: 3fr 1fr 1fr 1fr;
            gap: 40px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 48px;
            padding-top: 24px;
            text-align: center;
            color: var(--color-text-muted);
            font-size: 0.85rem;
        }

        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .advantage-cards {
                grid-template-columns: 1fr;
                max-width: 500px;
            }
            .biz-row {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .biz-row.reverse {
                display: flex;
                flex-direction: column-reverse;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .solution-cards {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-dock {
                border-radius: 28px;
                padding: 10px 20px;
            }
            .nav-links, .nav-cta {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .mobile-menu {
                position: fixed;
                top: 80px;
                left: 16px;
                right: 16px;
                background: rgba(250,248,245,0.98);
                backdrop-filter: blur(20px);
                border-radius: 24px;
                padding: 32px;
                flex-direction: column;
                gap: 20px;
                display: none;
                z-index: 100;
                box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            }
            .mobile-menu.active {
                display: flex;
            }
            .section {
                padding: 60px 0;
            }
            h2 {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 20px;
            }
            .btn {
                width: 100%;
                margin-bottom: 12px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }