/* roulang page: index */
:root {
            --color-primary: #0EA5E9;
            --color-primary-light: rgba(14, 165, 233, 0.15);
            --color-secondary: #8B5CF6;
            --color-accent: #10B981;
            --color-bg-dark: #0F172A;
            --color-bg-card: rgba(30, 41, 59, 0.7);
            --color-text-primary: #F8FAFC;
            --color-text-body: #CBD5E1;
            --color-text-muted: #94A3B8;
            --radius-xl: 1rem;
            --radius-2xl: 1.5rem;
            --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.5);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background: linear-gradient(to bottom, var(--color-bg-dark), #1E293B);
            color: var(--color-text-body);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        .glass-card {
            background: var(--color-bg-card);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: white;
            font-weight: 600;
            border: none;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .btn-outline {
            border: 2px solid white;
            background: transparent;
            color: white;
            transition: all 0.3s ease;
        }
        .btn-outline:hover {
            background: white;
            color: var(--color-bg-dark);
        }
        .nav-link {
            position: relative;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--color-primary);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .hover-lift {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .hover-lift:hover {
            transform: translateY(-8px);
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), var(--shadow-glow);
        }
        .scene-card {
            flex: 0 0 auto;
            width: 320px;
            scroll-snap-align: start;
        }
        @media (max-width: 768px) {
            .scene-card {
                width: 280px;
            }
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }
        .accordion-trigger[aria-expanded="true"] + .accordion-content {
            max-height: 500px;
        }

/* roulang page: category1 */
:root {
        --color-primary: #0EA5E9;
        --color-secondary: #8B5CF6;
        --color-accent: #10B981;
        --color-bg-dark: #0F172A;
        --color-bg-card: rgba(30, 41, 59, 0.7);
        --color-text-heading: #F8FAFC;
        --color-text-body: #CBD5E1;
        --color-text-muted: #94A3B8;
        --color-border: rgba(255, 255, 255, 0.1);
        --radius-lg: 1rem;
        --radius-xl: 1.5rem;
        --radius-2xl: 2rem;
        --shadow-card: 0 20px 25px -5px rgba(0, 0, 0, 0.25);
        --shadow-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
        --glow-primary: 0 0 20px rgba(14, 165, 233, 0.5);
    }
    
    * {
        box-sizing: border-box;
    }
    
    body {
        font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        background: linear-gradient(to bottom, #0F172A, #1E293B);
        color: var(--color-text-body);
        line-height: 1.6;
        overflow-x: hidden;
    }
    
    .container {
        width: 100%;
        max-width: 1280px;
        margin: 0 auto;
        padding: 0 1.5rem;
    }
    
    /* Navigation */
    header {
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--color-border);
        position: sticky;
        top: 0;
        z-index: 100;
    }
    
    .nav-link {
        position: relative;
    }
    
    .nav-link.active {
        background: rgba(14, 165, 233, 0.15);
        color: var(--color-primary) !important;
    }
    
    .nav-link.active::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 1rem;
        right: 1rem;
        height: 2px;
        background: var(--color-primary);
        border-radius: 1px;
    }
    
    .nav-link:hover:not(.active) {
        background: rgba(255, 255, 255, 0.05);
    }
    
    .btn-primary {
        background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
        color: white;
        font-weight: 600;
        box-shadow: var(--glow-primary);
        transition: all 0.3s ease;
    }
    
    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: var(--glow-primary), 0 10px 20px rgba(0, 0, 0, 0.2);
    }
    
    .btn-outline {
        border: 2px solid white;
        color: white;
        background: transparent;
        transition: all 0.3s ease;
    }
    
    .btn-outline:hover {
        background: white;
        color: var(--color-bg-dark);
    }
    
    /* Glass Card */
    .glass-card {
        background: var(--color-bg-card);
        backdrop-filter: blur(10px);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-xl);
    }
    
    /* Hero */
    .page-hero {
        min-height: 60vh;
        display: flex;
        align-items: center;
        position: relative;
        overflow: hidden;
    }
    
    .page-hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
        opacity: 0.2;
        z-index: -1;
    }
    
    /* Content Cards */
    .content-card {
        transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
    }
    
    .content-card:hover {
        transform: translateY(-8px);
        box-shadow: var(--shadow-hover);
        border-color: rgba(14, 165, 233, 0.3);
    }
    
    .category-tag {
        display: inline-flex;
        align-items: center;
        padding: 0.35rem 1rem;
        background: rgba(139, 92, 246, 0.2);
        color: #C4B5FD;
        border-radius: var(--radius-lg);
        font-size: 0.875rem;
        font-weight: 500;
    }
    
    /* Learning Path */
    .path-step {
        counter-increment: step-counter;
        position: relative;
        padding-left: 3.5rem;
    }
    
    .path-step::before {
        content: counter(step-counter);
        position: absolute;
        left: 0;
        top: 0;
        width: 2.5rem;
        height: 2.5rem;
        background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-weight: bold;
        font-size: 1.125rem;
    }
    
    /* FAQ */
    .faq-item {
        border-bottom: 1px solid var(--color-border);
    }
    
    .faq-question {
        cursor: pointer;
        padding: 1.5rem 0;
        position: relative;
    }
    
    .faq-question::after {
        content: '+';
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        font-size: 1.5rem;
        color: var(--color-primary);
        transition: transform 0.3s ease;
    }
    
    .faq-question.active::after {
        content: '−';
        transform: translateY(-50%) rotate(0deg);
    }
    
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
    }
    
    .faq-answer.open {
        max-height: 500px;
        padding-bottom: 1.5rem;
    }
    
    /* Responsive */
    @media (max-width: 768px) {
        header .container {
            padding: 0 1rem;
        }
        
        .page-hero {
            min-height: 50vh;
            padding-top: 3rem;
        }
        
        .grid-cols-2 {
            grid-template-columns: 1fr !important;
        }
        
        .grid-cols-3 {
            grid-template-columns: 1fr !important;
        }
        
        .path-step {
            padding-left: 0;
            padding-top: 3rem;
        }
        
        .path-step::before {
            top: -0.5rem;
            left: 0;
        }
    }
    
    @media (max-width: 640px) {
        h1 {
            font-size: 2.25rem !important;
        }
        
        h2 {
            font-size: 1.875rem !important;
        }
        
        .container {
            padding: 0 1rem;
        }
    }