/* roulang page: index */
:root {
            --primary: #E8451E;
            --primary-dark: #C93A17;
            --accent: #FFB81C;
            --dark-bg: #0F1119;
            --card-bg: #1F2233;
            --text-main: #111827;
            --text-secondary: #6B7280;
            --text-light: #D1D5DB;
            --border-light: #E5E7EB;
            --bg-light: #F9FAFB;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: #111827;
            background-color: #F9FAFB;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease;
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
        }

        .container-custom {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        @media (min-width: 768px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        /* 导航固定与阴影 */
        .nav-scrolled {
            box-shadow: 0 4px 13px rgba(0, 0, 0, 0.5);
        }

        /* Mega面板动画 */
        .mega-panel {
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            pointer-events: none;
        }

        .mega-trigger:hover+.mega-panel,
        .mega-panel:hover {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            pointer-events: auto;
        }

        /* 汉堡菜单抽屉 */
        #menu-toggle {
            display: none;
        }

        .mobile-drawer {
            position: fixed;
            top: 0;
            right: 0;
            width: 75%;
            max-width: 320px;
            height: 100vh;
            background: #1A1D2B;
            transform: translateX(100%);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 1000;
            padding: 2rem 1.5rem;
            box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
            display: flex;
            flex-direction: column;
        }

        #menu-toggle:checked~.mobile-drawer {
            transform: translateX(0);
        }

        .drawer-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease;
        }

        #menu-toggle:checked~.drawer-overlay {
            opacity: 1;
            visibility: visible;
        }

        /* FAQ手风琴 */
        .faq-item summary {
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.25rem 0;
            font-weight: 500;
            cursor: pointer;
            border-bottom: 1px solid var(--border-light);
            transition: background 0.2s;
        }

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

        .faq-item summary:hover {
            background: #F9FAFB;
        }

        .faq-icon {
            font-size: 1.5rem;
            color: var(--primary);
            transition: transform 0.3s ease;
            font-weight: 400;
        }

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

        .faq-content {
            padding: 0 0 1.25rem 0;
            color: #6B7280;
            line-height: 1.8;
        }

        /* 数据徽章动画 */
        .stat-badge {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .stat-badge:hover {
            transform: translateY(-4px);
            box-shadow: 0 10px 25px rgba(255, 184, 28, 0.25);
        }

        /* 卡片hover统一 */
        .card-hover {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: 0 14px 36px rgba(232, 69, 30, 0.15);
            border-color: #E8451E;
        }

        /* 按钮reset */
        .btn {
            display: inline-block;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            text-align: center;
            cursor: pointer;
            border: 2px solid transparent;
        }

        .btn-primary {
            background: #E8451E;
            color: white;
            padding: 14px 32px;
        }

        .btn-primary:hover {
            background: #C93A17;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(200, 50, 20, 0.45);
        }

        .btn-ghost {
            background: transparent;
            border: 2px solid white;
            color: white;
            padding: 14px 32px;
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid #E8451E;
            color: #E8451E;
            padding: 12px 28px;
        }

        .btn-outline:hover {
            background: rgba(232, 69, 30, 0.06);
            transform: translateY(-2px);
        }

        /* 装饰元素 */
        .decor-line {
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, #E8451E, #FFB81C);
            margin-top: 12px;
            border-radius: 2px;
        }

        .glow-border {
            border: 1px solid rgba(232, 69, 30, 0.35);
            box-shadow: 0 0 15px rgba(232, 69, 30, 0.25);
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.25rem !important;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
        }

        @media (max-width: 640px) {
            .hero-title {
                font-size: 1.8rem !important;
            }
            .grid-mobile-stack {
                grid-template-columns: 1fr !important;
            }
        }