/* roulang page: index */
:root {
            --primary: #00B887;
            --primary-dark: #0F9F76;
            --secondary: #F59E0B;
            --accent-purple: #6366F1;
            --bg-light: #F4F6F9;
            --bg-dark: #0F141C;
            --bg-dark-card: #18202C;
            --text-main: #111827;
            --text-muted: #4B5563;
            --text-light: #9CA3AF;
            --border-color: #E5E7EB;
        }

        body {
            font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        .code-font {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
        }

        .hero-bg {
            background: linear-gradient(135deg, rgba(15, 20, 28, 0.94) 0%, rgba(24, 32, 44, 0.96) 100%), url('/assets/images/f030da9631354be5.jpg') center/cover no-repeat;
        }

        .section-dark {
            background-color: var(--bg-dark);
            color: #F3F4F6;
        }

        .card-custom {
            background: #FFFFFF;
            border-radius: 10px;
            border: 1px solid #E5E7EB;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.06);
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }

        .card-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px -6px rgba(0, 0, 0, 0.08);
            border-color: rgba(0, 184, 135, 0.35);
        }

        .card-dark {
            background: var(--bg-dark-card);
            border-radius: 10px;
            border: 1px solid #283344;
            transition: all 0.25s ease;
        }

        .card-dark:hover {
            transform: translateY(-3px);
            border-color: var(--primary);
            box-shadow: 0 10px 25px -5px rgba(0, 184, 135, 0.15);
        }

        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 6px;
            padding: 0.65rem 1.4rem;
            transition: background-color 0.2s ease, transform 0.15s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .btn-outline {
            border: 1px solid rgba(255, 255, 255, 0.3);
            color: #FFFFFF;
            font-weight: 600;
            border-radius: 6px;
            padding: 0.65rem 1.4rem;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(0, 184, 135, 0.1);
            color: #A7F3D0;
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
        }

        .accordion-item.active .accordion-content {
            max-height: 500px;
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }

        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }

        .badge-tag {
            font-size: 0.75rem;
            padding: 0.2rem 0.6rem;
            border-radius: 4px;
            font-weight: 600;
            display: inline-block;
        }