/* roulang page: index */
:root {
            --primary-dark: #181D24;
            --primary-deep: #12161D;
            --aurora-teal: #0A5C66;
            --aurora-hover: #148596;
            --amber-accent: #C59A58;
            --bg-light: #F8F9FA;
            --text-main: #181D24;
            --text-muted: #596579;
            --border-color: #E2E8F0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-main);
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        .tabular-numbers {
            font-variant-numeric: tabular-nums;
        }

        .glass-header {
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .badge-amber {
            background-color: rgba(197, 154, 88, 0.12);
            color: #9E7432;
            border: 1px solid rgba(197, 154, 88, 0.3);
        }

        .hero-gradient {
            background: radial-gradient(circle at 50% 18%, rgba(10, 92, 102, 0.08) 0%, rgba(248, 249, 250, 0) 70%);
        }

        .card-subtle {
            background: #ffffff;
            border: 1px solid #E5E9EE;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .card-subtle:hover {
            border-color: rgba(10, 92, 102, 0.4);
            transform: translateY(-3px);
            box-shadow: 0 12px 28px -6px rgba(10, 92, 102, 0.09), 0 6px 12px -4px rgba(0, 0, 0, 0.03);
        }

        /* 原生 details 手风琴箭头动效 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }
        details[open] .faq-icon {
            transform: rotate(180deg);
        }

        /* 轮播帧切换淡入动画 */
        .slide-fade {
            transition: opacity 0.4s ease-in-out;
        }