/* roulang page: index */
:root {
            --color-primary: #059669;
            --color-primary-hover: #10b981;
            --color-bg-dark: #0b0f17;
            --color-bg-surface: #111827;
            --color-bg-light: #f8fafc;
            --color-border-subtle: rgba(226, 232, 240, 0.8);
            --color-border-dark: rgba(255, 255, 255, 0.08);
            --font-stack: Inter, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        html {
            scroll-behavior: smooth;
            font-family: var(--font-stack);
            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
        }

        body {
            background-color: #ffffff;
            color: #1e293b;
            line-height: 1.75;
            overflow-x: hidden;
        }

        /* 斜切首屏核心视觉 */
        .hero-diagonal-bg {
            position: relative;
            background: linear-gradient(135deg, #0b0f17 0%, #111827 65%, #064e3b 100%);
            clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
            padding-bottom: 7rem;
        }

        @media (max-width: 768px) {
            .hero-diagonal-bg {
                clip-path: polygon(0 0, 100% 0, 100% 95%, 0 100%);
                padding-bottom: 4rem;
            }
        }

        /* 网格质感底纹 */
        .grid-pattern {
            background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 0);
            background-size: 28px 28px;
        }

        /* 细微物理边框卡片与悬浮位移 */
        .glass-card {
            background: #ffffff;
            border: 1px solid rgba(226, 232, 240, 0.85);
            transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
        }

        .glass-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
            border-color: #10b981;
        }

        .dark-glass-card {
            background: rgba(17, 24, 39, 0.7);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.25s ease;
        }

        .dark-glass-card:hover {
            transform: translateY(-3px);
            border-color: rgba(16, 185, 129, 0.4);
            box-shadow: 0 15px 30px -10px rgba(0, 0, 0, 0.5);
        }

        /* 手风琴折叠动画与图标切换 */
        .faq-content {
            transition: max-height 0.35s ease-in-out, opacity 0.3s ease;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }

        .faq-item.active .faq-content {
            max-height: 250px;
            opacity: 1;
        }

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

        /* 徽章与通用小标签 */
        .pill-badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 14px;
            font-size: 0.8125rem;
            font-weight: 600;
            border-radius: 9999px;
            border: 1px solid;
            letter-spacing: 0.02em;
        }

        /* 输入框交互聚焦 */
        .form-input-focus:focus {
            outline: none;
            border-color: #059669;
            box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
        }