/* roulang page: index */
:root {
            --color-bg-main: #f8fafc;
            --color-surface: #ffffff;
            --color-navy: #0b0f19;
            --color-primary: #0284c7;
            --color-primary-hover: #0369a1;
            --color-accent: #d97706;
            --color-border: #e2e8f0;
            --color-text-main: #0f172a;
            --color-text-muted: #64748b;
        }

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            background-color: var(--color-bg-main);
            color: var(--color-text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }

        .hero-banner {
            background: linear-gradient(rgba(11, 15, 25, 0.88), rgba(11, 15, 25, 0.94)), url('/assets/images/e6c0696d4d301ce7.jpg') center/cover no-repeat;
        }

        .dark-section {
            background-color: var(--color-navy);
            color: #f1f5f9;
        }

        .card-elevated {
            background-color: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 1rem;
            transition: all 0.3s ease;
        }

        .card-elevated:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -10px rgba(15, 23, 42, 0.12);
            border-color: #cbd5e1;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.25rem 0.65rem;
            border-radius: 9999px;
        }

        .faq-item input:checked ~ .faq-content {
            max-height: 500px;
            opacity: 1;
            padding-top: 1rem;
        }

        .faq-item input:checked ~ .faq-header svg {
            transform: rotate(180deg);
        }

        .custom-scroll::-webkit-scrollbar {
            height: 6px;
        }
        .custom-scroll::-webkit-scrollbar-track {
            background: #f1f5f9;
        }
        .custom-scroll::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 3px;
        }