:root{--indigo: #4f46e5;--indigo-dark: #4338ca;--slate-900: #0f172a;--slate-700: #334155;--slate-500: #64748b;--slate-200: #e2e8f0;--slate-50: #f8fafc;--green-600: #16a34a;--green-50: #f0fdf4;--amber-500: #f59e0b;--amber-50: #fffbeb}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--slate-50);color:var(--slate-900)}.page{min-height:100vh;padding:24px}.wrap{max-width:760px;margin:0 auto}.banner{background:var(--amber-50);border:1px solid #fde68a;color:#92400e;padding:10px 16px;border-radius:10px;font-size:13px;margin-bottom:20px;display:flex;align-items:center;gap:8px}h1{font-size:26px;font-weight:700;margin:0}.subtitle{color:var(--slate-500);font-size:14px;margin-top:4px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}@media (max-width: 640px){.grid{grid-template-columns:1fr}}.card{background:#fff;border:1px solid var(--slate-200);border-radius:14px;overflow:hidden;transition:box-shadow .15s}.card:hover{box-shadow:0 4px 14px #0f172a14}.card-thumb{aspect-ratio:16/9;background:linear-gradient(135deg,var(--indigo),var(--slate-900));display:flex;align-items:center;justify-content:center;color:#ffffffb3}.card-body{padding:16px}.card-title{font-weight:600;font-size:15px;margin:0}.card-tagline{color:var(--slate-500);font-size:13px;margin-top:4px}.card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:14px}.card-duration{font-size:12px;color:#94a3b8}.btn{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;padding:7px 12px;border-radius:8px;border:none;cursor:pointer;transition:background .15s,opacity .15s}.btn-buy{background:var(--indigo);color:#fff}.btn-buy:hover{background:var(--indigo-dark)}.btn-buy:disabled{opacity:.6;cursor:not-allowed}.btn-watch{background:var(--green-50);color:var(--green-600)}.btn-ghost{background:transparent;color:var(--slate-500)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}.modal{background:#fff;border-radius:16px;width:100%;max-width:380px;padding:24px;box-shadow:0 20px 40px #0003}.modal h3{margin:0;font-size:17px;font-weight:600}.modal .course-name{color:var(--slate-500);font-size:13px;margin-top:4px}.price-row{display:flex;align-items:center;gap:2px;font-size:24px;font-weight:700;margin-top:16px}.test-hint{background:var(--slate-50);border:1px dashed var(--slate-200);border-radius:8px;padding:10px 12px;font-size:12px;color:var(--slate-500);margin-top:14px;line-height:1.5}.test-hint code{background:var(--slate-200);padding:1px 5px;border-radius:4px;font-size:11px}.stage-center{padding:32px 0;display:flex;flex-direction:column;align-items:center;gap:12px}.spinner{width:30px;height:30px;border:3px solid var(--indigo);border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.spin-icon{animation:spin .9s linear infinite}.stage-text{font-size:13px;color:var(--slate-700)}.player-back{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--slate-500);background:none;border:none;cursor:pointer;margin-bottom:16px;padding:0}.player-video-el{width:100%;aspect-ratio:16/9;border-radius:14px;background:#000;display:block}.player-video{background:var(--slate-900);border-radius:14px;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;position:relative;color:#fffc}.player-timer{position:absolute;bottom:10px;left:12px;font-size:11px;color:#ffffff80;font-family:monospace}.player-title{font-size:19px;font-weight:600;margin:16px 0 2px}.player-course{color:var(--slate-500);font-size:13px}.module-list{margin-top:20px;display:flex;flex-direction:column;gap:2px}.module-item{display:flex;align-items:center;justify-content:space-between;padding:11px 14px;border-radius:10px;background:none;border:none;cursor:pointer;text-align:left;width:100%;font-size:14px}.module-item:hover{background:var(--slate-50)}.module-item.active{background:#eef2ff;color:#3730a3}.module-left{display:flex;align-items:center;gap:10px}.module-duration{font-size:12px;color:#94a3b8;display:flex;align-items:center;gap:4px}.admin-input{padding:9px 12px;border:1px solid var(--slate-200);border-radius:8px;font-size:13px;font-family:inherit;outline:none}.admin-input:focus{border-color:var(--indigo)}.admin-upload-box{border:2px dashed var(--slate-200);border-radius:12px;padding:32px;text-align:center;cursor:pointer;transition:border-color .15s}.admin-upload-box:hover{border-color:var(--indigo)}.admin-progress-track{height:6px;background:var(--slate-200);border-radius:4px;margin-top:10px;overflow:hidden}.admin-progress-fill{height:100%;background:var(--indigo);transition:width .2s}.admin-part-row{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--slate-200);border-radius:8px;background:#fff}