/* roulang page: index */
:root {
            --primary: #4A1D96;
            --secondary: #00E5CC;
            --gradient: linear-gradient(135deg, #4A1D96 0%, #7B2FBE 50%, #00E5CC 100%);
            --bg: #F9FAFB;
            --card: #FFFFFF;
            --dark-bg: #0F0B1F;
            --text: #111827;
            --text-body: #374151;
            --text-muted: #6B7280;
            --white: #FFFFFF;
            --radius: 1rem;
            --shadow: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-hover: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
        }
        *, *::before, *::after { box-sizing: border-box; }
        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.6;
            margin: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a, button, input { outline: none; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        @media (min-width: 1024px) {
            .container { padding-left: 2rem; padding-right: 2rem; }
        }
        .nav-blur {
            background: rgba(255,255,255,0.8);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }
        .gradient-text {
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .btn-primary {
            background: var(--gradient);
            color: white;
            font-weight: 600;
            border-radius: 9999px;
            padding: 0.75rem 2rem;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            letter-spacing: 0.025em;
            box-shadow: 0 4px 10px rgba(74,29,150,0.3);
        }
        .btn-primary:hover {
            filter: brightness(1.1);
            transform: scale(1.05);
            box-shadow: 0 8px 20px rgba(74,29,150,0.4);
        }
        .btn-outline {
            border: 1.5px solid #d1d5db;
            color: var(--text);
            font-weight: 600;
            border-radius: 9999px;
            padding: 0.75rem 2rem;
            transition: all 0.3s ease;
            background: white;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(74,29,150,0.05);
            color: var(--primary);
        }
        .card {
            background: var(--card);
            border-radius: 1.5rem;
            padding: 2rem;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .badge {
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(8px);
            border-radius: 1rem;
            padding: 0.5rem 1rem;
            font-weight: 700;
            color: white;
        }
        .faq-item {
            border-bottom: 1px solid #e5e7eb;
            padding: 1.5rem 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.125rem;
            color: var(--text);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            color: var(--text-body);
            padding-top: 0;
        }
        .faq-item.open .faq-answer {
            max-height: 20rem;
            padding-top: 1rem;
        }
        .faq-icon {
            font-size: 1.5rem;
            font-weight: 300;
            transition: transform 0.3s;
            display: inline-block;
            width: 1.5rem;
            text-align: center;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        @media (max-width: 768px) {
            .btn-primary, .btn-outline { padding: 0.65rem 1.5rem; font-size: 0.9rem; }
            .card { padding: 1.5rem; }
            h1 { font-size: 2.25rem !important; }
        }