:root{--bg: #f6faf8;--card: #ffffff;--border: #e0ebe4;--text: #0e1f18;--text-dim: #5a6b62;--accent: #0f9d58;--accent-2: #34d399;--accent-dark: #0b6b45;--danger: #e2543f;--radius: 14px}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;min-height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}.wrap{max-width:1100px;margin:0 auto;padding:0 24px}.page{padding:40px 0 80px}.page.narrow{max-width:440px}.navbar{border-bottom:1px solid var(--border);background:#ffffffe6;position:sticky;top:0;z-index:10}.navbar-inner{max-width:1100px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem}.brand-mark{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--accent-dark),var(--accent-2));color:#fff;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:900}.nav-links{display:flex;gap:20px;font-size:.92rem;color:var(--text-dim)}.nav-links a:hover{color:var(--text)}.nav-actions{display:flex;align-items:center;gap:12px}.nav-user{font-size:.88rem;color:var(--text-dim)}.btn{display:inline-block;padding:10px 18px;border-radius:999px;border:none;cursor:pointer;background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;font-weight:600;font-size:.9rem}.btn:disabled{opacity:.6;cursor:default}.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--text)}.link-btn{background:none;border:none;color:var(--accent-dark);cursor:pointer;font-size:.85rem;padding:0}.link-btn.danger{color:var(--danger)}.hero-block{text-align:center;padding:40px 0 20px}.hero-block h1{font-size:2.2rem;margin-bottom:8px}.hero-block p{color:var(--text-dim)}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin-top:24px}.course-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease,border-color .15s ease}.course-card:hover{transform:translateY(-3px);border-color:var(--accent)}.course-thumb{height:100px;background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}.course-body{padding:16px;display:flex;flex-direction:column;gap:8px}.course-level{font-size:.72rem;font-weight:700;color:var(--accent-dark);text-transform:uppercase}.course-body h3{margin:0;font-size:1.05rem}.course-body p{margin:0;color:var(--text-dim);font-size:.88rem}.course-meta{display:flex;justify-content:space-between;font-size:.78rem;color:var(--text-dim)}.progress-bar{background:var(--border);border-radius:999px;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg,var(--accent),var(--accent-2));height:100%}.course-detail-header{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;border-bottom:1px solid var(--border);padding-bottom:24px;margin-bottom:24px}.instructor{color:var(--text-dim);font-size:.9rem}.enroll-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;min-width:220px;text-align:center}.curriculum h2{margin-bottom:12px}.section-block{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-bottom:14px}.section-block ul{list-style:none;padding:0;margin:8px 0 0;display:grid;gap:6px}.section-block li{font-size:.92rem;display:flex;gap:8px;justify-content:space-between}.section-block li.done{color:var(--accent-dark)}.section-block-header{display:flex;justify-content:space-between;align-items:center}.form{display:flex;flex-direction:column;gap:14px;margin-top:20px;max-width:420px}.form label{display:flex;flex-direction:column;gap:6px;font-size:.88rem;color:var(--text-dim);font-weight:600}.form input,.form textarea{padding:10px 12px;border-radius:8px;border:1px solid var(--border);font-size:.95rem;font-family:inherit}.error{color:var(--danger);font-size:.9rem}.hint{color:var(--text-dim);font-size:.8rem}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.admin-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.admin-table th,.admin-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border);font-size:.9rem}.badge-ok{color:var(--accent-dark);font-weight:700}.badge-off{color:var(--text-dim)}.row-actions{display:flex;gap:12px}.form-grid{max-width:720px;display:grid;grid-template-columns:1fr 1fr;gap:14px}.form-grid .full-width{grid-column:1 / -1}.checkbox-label{flex-direction:row!important;align-items:center;gap:8px!important}.curriculum-admin{margin-top:40px}.player-layout{display:grid;grid-template-columns:1fr 320px;min-height:calc(100vh - 65px)}.player-main{padding:24px}.video-player{width:100%;max-height:70vh;background:#000;border-radius:var(--radius)}.player-info{margin-top:16px;display:flex;justify-content:space-between;align-items:center}.player-sidebar{border-left:1px solid var(--border);padding:20px;background:var(--card);overflow-y:auto}.sidebar-section h4{font-size:.85rem;color:var(--text-dim);margin:16px 0 8px}.sidebar-section ul{list-style:none;padding:0;margin:0;display:grid;gap:4px}.sidebar-section li{padding:8px 10px;border-radius:8px;cursor:pointer;font-size:.88rem;display:flex;gap:8px}.sidebar-section li:hover{background:var(--bg)}.sidebar-section li.active{background:#0f9d581a;font-weight:700}.sidebar-section li.done{color:var(--accent-dark)}@media (max-width: 820px){.player-layout{grid-template-columns:1fr}.player-sidebar{border-left:none;border-top:1px solid var(--border)}.form-grid{grid-template-columns:1fr}}