*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #0a0a0a;
    --bg-card: #111111;
    --bg-card2: #181818;
    --border: #222222;
    --accent: #e11d48;
    --accent-hover: #be123c;
    --text: #f5f5f5;
    --text-muted: #888888;
    --text-dim: #555555;
    --radius: 12px;
}

body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; }

a { color: inherit; text-decoration: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* NAVBAR */
.navbar { position: sticky; top: 0; z-index: 100; background: rgba(10,10,10,0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.2rem; color: var(--text); }
.logo-icon { color: var(--accent); font-size: 1.1rem; }
.nav-links { display: flex; gap: 8px; }
.nav-links a { padding: 8px 16px; border-radius: 8px; font-size: 0.9rem; font-weight: 500; color: var(--text-muted); transition: all 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--bg-card); }
.nav-links a.active { color: var(--accent); }

/* HERO */
.hero { padding: 100px 0 80px; text-align: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 100px; padding: 6px 16px; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 32px; }
.hero-badge span { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; display: inline-block; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; line-height: 1.15; margin-bottom: 24px; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p { font-size: 1.1rem; color: var(--text-muted); max-width: 560px; margin: 0 auto 40px; }
.btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; padding: 14px 28px; border-radius: 8px; font-weight: 600; font-size: 0.95rem; transition: all 0.2s; cursor: pointer; border: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { background: var(--bg-card); }

/* STATS */
.stats { padding: 40px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); margin-bottom: 80px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-value { font-size: 2.2rem; font-weight: 800; color: var(--text); }
.stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* SECTION */
.section { padding: 60px 0; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 32px; }
.section-title { font-size: 1.6rem; font-weight: 700; }
.section-link { color: var(--accent); font-size: 0.9rem; font-weight: 500; }
.section-link:hover { text-decoration: underline; }

/* COURSE CARDS */
.courses-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.course-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: transform 0.2s, border-color 0.2s; display: flex; flex-direction: column; }
.course-card:hover { transform: translateY(-3px); border-color: #333; }
.card-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--bg-card2); }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.card-badge { position: absolute; top: 10px; left: 10px; background: var(--accent); color: #fff; font-size: 0.7rem; font-weight: 700; padding: 3px 8px; border-radius: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.card-level { position: absolute; top: 10px; right: 10px; background: rgba(0,0,0,0.75); color: var(--text); font-size: 0.7rem; font-weight: 600; padding: 3px 8px; border-radius: 4px; }
.card-body { padding: 16px; flex: 1; display: flex; flex-direction: column; }
.card-category { font-size: 0.75rem; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.card-title { font-size: 1rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
.card-channel { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }
.card-meta { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-dim); margin-top: auto; }
.card-footer { padding: 12px 16px; border-top: 1px solid var(--border); }
.card-footer a { display: block; text-align: center; background: var(--accent); color: #fff; padding: 10px; border-radius: 8px; font-size: 0.85rem; font-weight: 600; transition: background 0.2s; }
.card-footer a:hover { background: var(--accent-hover); }

/* CATEGORIES GRID */
.categories-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.cat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 20px; display: flex; align-items: center; gap: 16px; transition: all 0.2s; }
.cat-card:hover { border-color: var(--accent); background: var(--bg-card2); }
.cat-icon { width: 44px; height: 44px; background: rgba(225,29,72,0.12); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.cat-name { font-weight: 600; font-size: 0.95rem; }
.cat-count { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* FILTERS */
.filters { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin-bottom: 28px; display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.filter-group { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 180px; }
.filter-group label { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }
.filter-group input, .filter-group select { background: var(--bg); border: 1px solid var(--border); color: var(--text); padding: 10px 14px; border-radius: 8px; font-size: 0.9rem; font-family: inherit; outline: none; }
.filter-group input:focus, .filter-group select:focus { border-color: var(--accent); }
.filter-group select option { background: var(--bg-card2); }
.filter-btn { padding: 10px 20px; background: var(--accent); color: #fff; border: none; border-radius: 8px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: inherit; transition: background 0.2s; white-space: nowrap; }
.filter-btn:hover { background: var(--accent-hover); }
.reset-btn { padding: 10px 16px; background: transparent; color: var(--text-muted); border: 1px solid var(--border); border-radius: 8px; font-size: 0.9rem; cursor: pointer; font-family: inherit; transition: all 0.2s; white-space: nowrap; }
.reset-btn:hover { color: var(--text); border-color: #444; }

/* RESULTS INFO */
.results-info { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 20px; }
.results-info strong { color: var(--text); }

/* COURSE DETAIL */
.detail-page { padding: 48px 0; }
.detail-back { display: inline-flex; align-items: center; gap: 8px; color: var(--text-muted); font-size: 0.9rem; margin-bottom: 32px; transition: color 0.2s; }
.detail-back:hover { color: var(--text); }
.detail-grid { display: grid; grid-template-columns: 1fr 380px; gap: 40px; }
.detail-thumb { border-radius: var(--radius); overflow: hidden; aspect-ratio: 16/9; background: var(--bg-card2); margin-bottom: 28px; }
.detail-thumb img { width: 100%; height: 100%; object-fit: cover; }
.detail-category { font-size: 0.8rem; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 12px; }
.detail-title { font-size: 2rem; font-weight: 800; line-height: 1.25; margin-bottom: 16px; }
.detail-meta { display: flex; gap: 20px; flex-wrap: wrap; color: var(--text-muted); font-size: 0.85rem; margin-bottom: 24px; }
.detail-meta span { display: flex; align-items: center; gap: 6px; }
.detail-desc { color: var(--text-muted); line-height: 1.8; font-size: 0.95rem; margin-bottom: 24px; }
.detail-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.tag { background: var(--bg-card2); border: 1px solid var(--border); padding: 4px 12px; border-radius: 100px; font-size: 0.8rem; color: var(--text-muted); }
.detail-sidebar { position: sticky; top: 80px; }
.sidebar-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.sidebar-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 20px; }
.sidebar-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.sidebar-row:last-of-type { border-bottom: none; }
.sidebar-row .label { color: var(--text-muted); }
.sidebar-row .value { font-weight: 500; }
.watch-btn { display: block; width: 100%; text-align: center; background: var(--accent); color: #fff; padding: 14px; border-radius: 10px; font-weight: 700; font-size: 1rem; margin-top: 20px; transition: background 0.2s; }
.watch-btn:hover { background: var(--accent-hover); }

/* PAGE HEADER */
.page-header { padding: 60px 0 40px; border-bottom: 1px solid var(--border); margin-bottom: 48px; }
.page-header h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 12px; }
.page-header p { color: var(--text-muted); font-size: 1rem; max-width: 560px; }

/* EMPTY STATE */
.empty { text-align: center; padding: 80px 24px; color: var(--text-muted); }
.empty h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 8px; color: var(--text); }

/* FOOTER */
.footer { border-top: 1px solid var(--border); padding: 40px 0; margin-top: 80px; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-logo { font-weight: 700; font-size: 1.1rem; display: flex; align-items: center; gap: 6px; }
.footer-text { color: var(--text-muted); font-size: 0.85rem; }

/* RESPONSIVE */
@media (max-width: 768px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .detail-grid { grid-template-columns: 1fr; }
    .detail-sidebar { position: static; }
    .detail-title { font-size: 1.5rem; }
    .hero h1 { font-size: 2rem; }
    .nav-links a { padding: 8px 10px; font-size: 0.85rem; }
    .filters { flex-direction: column; }
}
@media (max-width: 480px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .hero { padding: 60px 0 48px; }
}