/* roulang page: index */
:root {
            --bg-obsidian: #0B0E14;
            --bg-card: #131822;
            --bg-card-hover: #18202C;
            --bg-elevated: #1E2736;
            --gold-champagne: #C5A880;
            --gold-light: #DFCA9F;
            --emerald-deep: #0D3B36;
            --emerald-border: #155E54;
            --text-pure: #F5F7FA;
            --text-silver: #9EABB9;
            --text-subtle: #64748B;
            --gold-glow: 0 0 25px rgba(197, 168, 128, 0.22);
            --gold-border: rgba(197, 168, 128, 0.28);
        }

        html {
            scroll-behavior: smooth;
            background-color: var(--bg-obsidian);
            color: var(--text-pure);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
        }

        body {
            overflow-x: hidden;
            line-height: 1.65;
        }

        .gold-gradient-text {
            background: linear-gradient(135deg, #DFCA9F 0%, #C5A880 50%, #B39160 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .gold-btn {
            background: linear-gradient(135deg, #C5A880 0%, #DFCA9F 100%);
            color: #0B0E14;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(197, 168, 128, 0.25);
        }

        .gold-btn:hover {
            box-shadow: 0 6px 25px rgba(223, 202, 159, 0.45);
            transform: translateY(-2px);
        }

        .glass-panel {
            background: rgba(19, 24, 34, 0.78);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--gold-border);
        }

        .glass-panel-hover:hover {
            border-color: rgba(197, 168, 128, 0.55);
            box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.6), var(--gold-glow);
            transform: translateY(-3px);
            transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .emerald-pill {
            background: rgba(13, 59, 54, 0.4);
            border: 1px solid var(--emerald-border);
            color: #5EEAD4;
        }

        .section-separator {
            border-top: 1px solid rgba(197, 168, 128, 0.12);
            position: relative;
        }

        .section-separator::after {
            content: '';
            position: absolute;
            top: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 140px;
            height: 1px;
            background: linear-gradient(90deg, transparent, #C5A880, transparent);
        }

        /* Accordion transition */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.35s ease;
        }
        .faq-item.active .faq-answer {
            max-height: 250px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }