/* roulang page: index */
:root {
            --primary-color: #ff3e3e;
            --dark-bg: #0f172a;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --card-bg: #1e293b;
            --radius: 12px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background-color: var(--dark-bg); color: var(--text-main); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { padding: 20px 0; border-bottom: 1px solid #334155; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: bold; color: var(--primary-color); text-decoration: none; }
        .nav-links a { color: var(--text-main); margin-left: 20px; text-decoration: none; transition: 0.3s; }
        .nav-links a:hover { color: var(--primary-color); }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.8)), url('/assets/images/backpic/back-1.webp') no-repeat center/cover; }
        .hero h1 { font-size: 3rem; margin-bottom: 20px; }
        .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 30px; margin: 40px 0; }
        .card { background: var(--card-bg); border-radius: var(--radius); overflow: hidden; transition: 0.3s; }
        .card:hover { transform: translateY(-10px); box-shadow: 0 10px 20px rgba(0,0,0,0.3); }
        .card img { width: 100%; height: 180px; object-fit: cover; }
        .card-body { padding: 20px; }
        .btn { display: inline-block; padding: 12px 24px; background: var(--primary-color); color: #fff; border-radius: 8px; text-decoration: none; margin-top: 20px; }
        footer { padding: 40px 0; text-align: center; border-top: 1px solid #334155; color: var(--text-muted); }
        @media (max-width: 768px) { .hero h1 { font-size: 2rem; } }

/* roulang page: article */
:root {
            --primary: #e11d48;
            --dark: #0f172a;
            --light: #f8fafc;
            --gray: #64748b;
            --radius: 12px;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--light); color: var(--dark); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        header { background: #fff; padding: 20px 0; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z-index: 1000; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: 800; color: var(--primary); text-decoration: none; }
        .nav-links a { margin-left: 20px; text-decoration: none; color: var(--gray); font-weight: 500; transition: color 0.3s; }
        .nav-links a:hover { color: var(--primary); }

        .banner { background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.8)), url('/assets/images/backpic/back-1.webp') center/cover; height: 300px; display: flex; align-items: center; justify-content: center; color: #fff; text-align: center; }
        .banner h1 { font-size: 3rem; margin-bottom: 10px; }
        
        .main-content { padding: 60px 0; background: #fff; min-height: 500px; }
        .article-body { max-width: 800px; margin: 0 auto; }
        .article-body img { max-width: 100%; border-radius: var(--radius); margin: 20px 0; }
        
        footer { background: var(--dark); color: #fff; padding: 40px 0; text-align: center; margin-top: 60px; }
        
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .banner h1 { font-size: 2rem; }
        }

/* roulang page: category1 */
:root {
            --primary: #e63946;
            --dark: #1d3557;
            --light: #f1faee;
            --accent: #a8dadc;
            --text: #457b9d;
            --bg: #ffffff;
            --radius: 12px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: var(--bg); color: var(--dark); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: #fff; border-bottom: 2px solid var(--accent); padding: 15px 0; position: sticky; top: 0; z-index: 1000; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: bold; color: var(--primary); text-decoration: none; }
        .nav-links a { margin-left: 20px; text-decoration: none; color: var(--dark); font-weight: 500; }
        .nav-links a.active { color: var(--primary); border-bottom: 2px solid var(--primary); }
        .hero { background: linear-gradient(rgba(29, 53, 87, 0.7), rgba(29, 53, 87, 0.7)), url('/assets/images/backpic/back-1.webp') no-repeat center/cover; padding: 80px 0; text-align: center; color: white; }
        .hero h1 { font-size: 3rem; margin-bottom: 20px; }
        .main-content { padding: 60px 0; }
        .card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 30px; }
        .card { border: 1px solid #eee; border-radius: var(--radius); overflow: hidden; transition: transform 0.3s; }
        .card:hover { transform: translateY(-10px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        .card img { width: 100%; height: 200px; object-fit: cover; }
        .card-body { padding: 20px; }
        .faq { background: #f8f9fa; padding: 60px 0; }
        .cta { text-align: center; padding: 60px 0; }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary); color: #fff; border-radius: var(--radius); text-decoration: none; font-weight: bold; }
        footer { background: var(--dark); color: white; text-align: center; padding: 30px 0; }

/* roulang page: category2 */
:root {
            --primary-color: #e63946;
            --secondary-color: #1d3557;
            --bg-color: #f1faee;
            --text-color: #212529;
            --light-text: #6c757d;
            --border-radius: 12px;
            --shadow: 0 4px 6px rgba(0,0,0,0.1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background: var(--bg-color); color: var(--text-color); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: #fff; padding: 20px 0; box-shadow: var(--shadow); }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 1.5rem; font-weight: bold; color: var(--primary-color); text-decoration: none; }
        .nav-links a { margin-left: 20px; color: var(--text-color); text-decoration: none; font-weight: 500; }
        .nav-links a.active { color: var(--primary-color); border-bottom: 2px solid var(--primary-color); }
        .hero { padding: 80px 0; background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('/assets/images/backpic/back-1.webp') center/cover; color: #fff; text-align: center; }
        .hero h1 { font-size: 3rem; margin-bottom: 20px; }
        .section { padding: 60px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: #fff; border-radius: var(--border-radius); overflow: hidden; box-shadow: var(--shadow); transition: transform 0.3s; }
        .card:hover { transform: translateY(-10px); }
        .card img { width: 100%; height: 200px; object-fit: cover; }
        .card-body { padding: 20px; }
        .faq-item { background: #fff; padding: 20px; margin-bottom: 15px; border-radius: var(--border-radius); }
        .cta { background: var(--secondary-color); color: #fff; padding: 60px 0; text-align: center; border-radius: var(--border-radius); margin-top: 40px; }
        footer { padding: 40px 0; text-align: center; color: var(--light-text); border-top: 1px solid #dee2e6; }

/* roulang page: category3 */
:root {
            --primary-color: #e11d48;
            --bg-color: #0f172a;
            --text-color: #f8fafc;
            --secondary-text: #94a3b8;
            --accent-color: #1e293b;
            --border-radius: 12px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background: var(--bg-color); color: var(--text-color); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: rgba(15, 23, 42, 0.95); padding: 20px 0; border-bottom: 1px solid var(--accent-color); position: sticky; top: 0; z-index: 100; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: bold; color: var(--primary-color); text-decoration: none; }
        .nav-links a { color: var(--secondary-text); text-decoration: none; margin-left: 25px; transition: color 0.3s; }
        .nav-links a:hover, .nav-links a.active { color: var(--primary-color); }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(rgba(15,23,42,0.8), rgba(15,23,42,0.8)), url('/assets/images/backpic/back-2.webp'); background-size: cover; border-radius: var(--border-radius); margin-top: 20px; }
        h1 { font-size: 3rem; margin-bottom: 20px; }
        .feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin: 50px 0; }
        .card { background: var(--accent-color); border-radius: var(--border-radius); overflow: hidden; transition: transform 0.3s; }
        .card:hover { transform: translateY(-10px); }
        .card img { width: 100%; height: 200px; object-fit: cover; }
        .card-body { padding: 20px; }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary-color); color: white; border-radius: 30px; text-decoration: none; font-weight: bold; margin-top: 20px; }
        footer { padding: 40px 0; text-align: center; color: var(--secondary-text); border-top: 1px solid var(--accent-color); }

/* roulang page: category4 */
:root {
            --primary: #e11d48;
            --dark: #0f172a;
            --light: #f8fafc;
            --gray: #64748b;
            --border: #e2e8f0;
            --radius: 12px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background: var(--light); color: var(--dark); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: #fff; border-bottom: 1px solid var(--border); padding: 15px 0; position: sticky; top: 0; z-index: 100; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 1.5rem; font-weight: bold; color: var(--primary); text-decoration: none; }
        .nav-links a { margin-left: 20px; color: var(--dark); text-decoration: none; font-weight: 500; transition: color 0.3s; }
        .nav-links a.active { color: var(--primary); }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('/assets/images/backpic/back-1.webp') center/cover; color: #fff; border-radius: 0 0 40px 40px; }
        .hero h1 { font-size: 2.5rem; margin-bottom: 20px; }
        .section { padding: 60px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 30px; }
        .card { background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); transition: transform 0.3s; }
        .card:hover { transform: translateY(-5px); }
        .card img { width: 100%; height: 200px; object-fit: cover; }
        .card-body { padding: 20px; }
        .btn { display: inline-block; padding: 12px 25px; background: var(--primary); color: #fff; border-radius: var(--radius); text-decoration: none; font-weight: 600; margin-top: 10px; }
        footer { padding: 40px 0; background: var(--dark); color: #fff; text-align: center; }
        @media (max-width: 768px) { .nav-links { display: none; } }

/* roulang page: category5 */
:root {
            --primary: #e11d48;
            --dark: #0f172a;
            --gray: #64748b;
            --light: #f8fafc;
            --radius: 12px;
            --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--light); color: var(--dark); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: #fff; padding: 20px 0; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z-index: 100; }
        nav { display: flex; align-items: center; justify-content: space-between; }
        .logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); text-decoration: none; }
        .nav-links { display: flex; gap: 20px; }
        .nav-links a { text-decoration: none; color: var(--dark); font-weight: 500; transition: color 0.3s; }
        .nav-links a:hover, .nav-links a.active { color: var(--primary); }
        .hero { padding: 80px 0; background: linear-gradient(rgba(15,23,42,0.8), rgba(15,23,42,0.8)), url('/assets/images/backpic/back-3.webp') center/cover; color: #fff; text-align: center; border-radius: 0 0 var(--radius) var(--radius); }
        .hero h1 { font-size: 3rem; margin-bottom: 20px; }
        .content-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 30px; padding: 60px 0; }
        .card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform 0.3s; }
        .card:hover { transform: translateY(-10px); }
        .card img { width: 100%; height: 200px; object-fit: cover; }
        .card-body { padding: 20px; }
        .card-body h3 { margin-bottom: 10px; }
        .cta-section { padding: 60px 0; background: #fff; text-align: center; }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary); color: #fff; border-radius: 50px; text-decoration: none; font-weight: 600; }
        footer { padding: 40px 0; background: var(--dark); color: #94a3b8; text-align: center; }
        @media (max-width: 768px) { .hero h1 { font-size: 2rem; } .nav-links { display: none; } }