/* roulang page: index */
:root {
            --brand-dark: #081226;
            --brand-deep: #0B132B;
            --brand-primary: #0284C7;
            --brand-cyan: #06B6D4;
            --brand-accent: #10B981;
            --brand-surface: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-light: rgba(226, 232, 240, 0.85);
            --shadow-card: 0 10px 30px -10px rgba(2, 132, 199, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
            --shadow-float: 0 20px 40px -15px rgba(2, 132, 199, 0.16);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

        body {
            background-color: var(--brand-surface);
            color: var(--text-main);
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 统一平滑滚动与排版约束 */
        .container-custom {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        /* 品牌渐变与卡片体系 */
        .bg-brand-gradient {
            background: linear-gradient(135deg, #0284C7 0%, #06B6D4 100%);
        }
        .bg-brand-dark-grad {
            background: linear-gradient(145deg, #081226 0%, #0F1D38 100%);
        }
        .text-gradient {
            background: linear-gradient(135deg, #0284C7 0%, #06B6D4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .text-gradient-cyan {
            background: linear-gradient(135deg, #38BDF8 0%, #34D399 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 圆角大卡 */
        .card-rounded {
            background: #FFFFFF;
            border-radius: 1.5rem;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-rounded:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-float);
            border-color: rgba(2, 132, 199, 0.3);
        }

        /* 数据徽章 */
        .badge-pulse {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.35rem 0.85rem;
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 600;
            background: rgba(2, 132, 199, 0.08);
            color: #0284C7;
            border: 1px solid rgba(2, 132, 199, 0.2);
        }
        .badge-pulse-dark {
            background: rgba(6, 182, 212, 0.12);
            color: #38BDF8;
            border: 1px solid rgba(56, 189, 248, 0.3);
        }
        .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: #10B981;
            box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
            animation: pulse-ring 2s infinite;
        }
        @keyframes pulse-ring {
            0% {
                transform: scale(0.95);
                box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
            }
            70% {
                transform: scale(1);
                box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
            }
            100% {
                transform: scale(0.95);
                box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
            }
        }

        /* 进度环 SVG */
        .progress-ring__circle {
            transition: stroke-dashoffset 0.8s ease-in-out;
            transform: rotate(-90deg);
            transform-origin: 50% 50%;
        }

        /* 手风琴效果 */
        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .faq-item.active .faq-content {
            max-height: 250px;
            opacity: 1;
        }
        .faq-item.active .faq-chevron {
            transform: rotate(180deg);
        }