@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}:root{--primary: #2563eb;--primary-dark: #1d4ed8;--secondary: #475569;--dark-bg: #f8fafc;--card-bg: #ffffff;--text-main: #0f172a;--text-muted: #64748b;--border: #e2e8f0;--gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1);--radius: 6px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Outfit,sans-serif;background-color:var(--dark-bg);color:var(--text-main);line-height:1.6;overflow-x:hidden}a{text-decoration:none;color:inherit}button{cursor:pointer;border:none;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:2rem}.btn{padding:.75rem 1.5rem;border-radius:var(--radius);font-weight:600;transition:all .3s 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.3s}.card:hover{transform:translateY(-5px);border-color:var(--primary)}.grid-courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.flex-center{display:flex;justify-content:center;align-items:center}.flex-between{display:flex;justify-content:space-between;align-items:center}h1,h2,h3,h4,.gradient-text{color:var(--text-main);background:none;-webkit-background-clip:unset;-webkit-text-fill-color:unset;font-weight:600;letter-spacing:-.5px}.sidebar{width:260px;background:#1e293b;border-right:1px solid #334155;display:flex;flex-direction:column;padding:1.5rem;position:fixed;height:100vh;z-index:50;color:#f8fafc;box-shadow:4px 0 24px #0000000d}.sidebar-logo{font-size:1.25rem;font-weight:700;margin-bottom:2.5rem;color:#fff;display:flex;align-items:center;gap:.75rem}.nav-item{display:flex;align-items:center;gap:.75rem;padding:.85rem 1rem;border-radius:6px;color:#94a3b8;transition:all .2s 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#0000001a}.sidebar.open{left:0}.admin-content{margin-left:0;padding:1rem 1.5rem 1.5rem}.sidebar-overlay{position:fixed;inset:0;background:#00000080;z-index:1500}.admin-mobile-header{display:flex!important;align-items:center;background:#fff;padding:1rem;gap:1rem;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:900}}.course-viewer-layout{display:flex;min-height:100vh;background:var(--dark-bg)}.course-sidebar{width:350px;background:#fff;border-right:1px solid #e2e8f0;overflow-y:auto;position:fixed;height:100vh;left:0;top:0;z-index:10}.course-content{margin-left:350px;flex:1;padding:2rem}@media(max-width:900px){.course-viewer-layout{flex-direction:column;height:100vh;overflow-y:auto;-webkit-overflow-scrolling:touch}.course-sidebar{width:100%;position:relative;height:auto;max-height:none;order:2;border-right:none;border-top:1px solid 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td:nth-child(4){min-width:120px}}.admin-course-header{display:flex;justify-content:space-between;align-items:flex-start;gap:2rem;flex-wrap:wrap}.course-status-badge{display:flex;flex-direction:column;align-items:flex-end;gap:.5rem}.course-basic-info-grid{display:grid;grid-template-columns:minmax(300px,2fr) 1fr;gap:2rem;align-items:start}.chapter-header{padding:1rem 1.5rem;background:#f8fafc;border-bottom:1px solid #e2e8f0;display:flex;justify-content:space-between;align-items:center}.lesson-item{display:flex;align-items:center;gap:1rem;padding:.75rem;border:1px solid #f1f5f9;border-radius:6px;background:#fff;transition:all .2s}.lesson-grid{display:grid;grid-template-columns:minmax(200px,2fr) minmax(150px,1fr) 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.5rem;border-radius:4px;font-size:.8rem;white-space:nowrap}.chapter-title-input{background:transparent;border:none;font-weight:600;font-size:1rem;flex:1;outline:none;color:var(--text-main);min-width:0}@media(max-width:768px){.chapter-title-wrapper{flex-direction:column;align-items:flex-start;gap:.5rem}.chapter-title-input{width:100%;border-bottom:1px solid #e2e8f0!important;padding-bottom:.25rem;border-radius:0}.lesson-grid input{border-bottom:1px solid #e2e8f0!important;padding-bottom:.25rem;background:transparent!important}}.admin-section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.btn-add-lesson{margin-top:1rem;background:#fff;border:1px dashed #cbd5e1;color:var(--primary);padding:.6rem;border-radius:6px;width:100%;cursor:pointer;font-size:.9rem;font-weight:500;transition:all .2s}.btn-add-lesson:hover{border-color:var(--primary);background:#eff6ff}@media(max-width:600px){.admin-section-header{flex-direction:column;align-items:flex-start;gap:1rem}.admin-section-header button{width:100%;padding:.75rem}}