.topnav{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.topnav-inner{max-width:1120px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 28px}.logo{font-weight:700;font-size:15px;display:flex;align-items:center;gap:8px;cursor:pointer}.logo span{color:var(--accent-light)}.topnav-actions{display:flex;align-items:center;gap:8px}.theme-picker{display:inline-flex;align-items:center;gap:6px;margin:0;color:var(--muted);font-size:12px}.theme-picker select{width:auto;min-width:78px;padding:5px 28px 5px 10px;font-size:12px}.back-btn{background:none;border:1px solid var(--border);color:var(--muted);border-radius:6px;padding:5px 12px;font-size:12px;cursor:pointer}.back-btn:hover{border-color:var(--accent);color:var(--accent-light)}.back-btn.nav-active{border-color:var(--accent);color:var(--accent-light);background:color-mix(in srgb,var(--accent) 12%,transparent)}.logout-btn{color:#f87171;border-color:#f871714d}.logout-btn:hover{border-color:#f87171;color:#fca5a5}.user-badge{font-size:11px;color:var(--muted);padding:4px 10px;background:var(--surface-2, rgba(99,102,241,.08));border:1px solid var(--border);border-radius:20px;white-space:nowrap}.page-header{max-width:960px;margin:0 auto;padding:28px 28px 0}.page-header h1{font-size:22px;font-weight:700;margin-bottom:4px}.page-header p{color:var(--muted);font-size:13px}:root{--bg: #0d0f18;--surface: #161926;--surface2: #1e2235;--border: #2a2f4a;--accent: #6366f1;--accent-light: #818cf8;--cyan: #22d3ee;--green: #10b981;--warn: #f59e0b;--red: #ef4444;--text: #e2e8f0;--muted: #64748b;--pill-blue-bg: #1e3a5f;--pill-blue-text: #93c5fd;--pill-green-bg: #064e3b;--pill-green-text: #6ee7b7;--pill-yellow-bg: #451a03;--pill-yellow-text: #fde68a;--pill-purple-bg: #2e1a2e;--pill-purple-text: #e879f9;--pill-gray-bg: #1e1e2e;--pill-gray-text: #94a3b8;--type-interactive-bg: #1a2e1a;--type-interactive-text: #86efac;--type-video-bg: #1e3a5f;--type-video-text: #93c5fd;--type-audio-bg: #0e3a47;--type-audio-text: #67e8f9;--type-image-bg: #2e1a2e;--type-image-text: #e879f9;--type-form-bg: #2e2a1a;--type-form-text: #fde68a;--type-model3d-bg: #2b1e47;--type-model3d-text: #c4b5fd;--type-sim-bg: #3a1a1a;--type-sim-text: #fca5a5;--type-dashboard-bg: #07304a;--type-dashboard-text: #7dd3fc;--radius: 12px}:root[data-theme=light]{--bg: #f6f8fc;--surface: #ffffff;--surface2: #eef2f8;--border: #d9e2ef;--accent: #4f46e5;--accent-light: #6366f1;--cyan: #0891b2;--green: #059669;--warn: #d97706;--red: #dc2626;--text: #172033;--muted: #64748b;--pill-blue-bg: #dbeafe;--pill-blue-text: #1d4ed8;--pill-green-bg: #dcfce7;--pill-green-text: #047857;--pill-yellow-bg: #fef3c7;--pill-yellow-text: #b45309;--pill-purple-bg: #f3e8ff;--pill-purple-text: #9333ea;--pill-gray-bg: #e2e8f0;--pill-gray-text: #475569;--type-interactive-bg: #dcfce7;--type-interactive-text: #047857;--type-video-bg: #dbeafe;--type-video-text: #1d4ed8;--type-audio-bg: #cffafe;--type-audio-text: #0e7490;--type-image-bg: #fce7f3;--type-image-text: #be185d;--type-form-bg: #fef3c7;--type-form-text: #b45309;--type-model3d-bg: #ede9fe;--type-model3d-text: #6d28d9;--type-sim-bg: #fee2e2;--type-sim-text: #b91c1c;--type-dashboard-bg: #e0f2fe;--type-dashboard-text: #0369a1}*{box-sizing:border-box;margin:0;padding:0}html,body,#app{height:100%}body{background:var(--bg);color:var(--text);font-family:SF Pro Display,PingFang SC,Noto Sans SC,system-ui,sans-serif;font-size:14px;-webkit-font-smoothing:antialiased}a{color:var(--accent-light);text-decoration:none}button{font-family:inherit}.btn{display:inline-flex;align-items:center;gap:8px;border:none;border-radius:8px;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:opacity .15s,transform .1s,background .15s}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-light)}.btn-outline{background:none;border:1px solid var(--border);color:var(--text)}.btn-outline:hover:not(:disabled){border-color:var(--accent);color:var(--accent-light)}.btn-green{background:var(--green);color:#fff}.btn-warn{background:var(--warn);color:#000}.btn-red{background:var(--red);color:#fff}.btn-full{width:100%;justify-content:center;padding:13px;font-size:15px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px}.card-title{font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}#toast{position:fixed;bottom:28px;left:50%;transform:translate(-50%);background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:10px 20px;font-size:13px;opacity:0;transition:opacity .2s;pointer-events:none;z-index:999;max-width:80%}#toast.show{opacity:1}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}@keyframes spin{to{transform:rotate(360deg)}}.spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}input[type=text],input[type=search],textarea,select{background:var(--surface2);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:10px 12px;font-size:14px;font-family:inherit;width:100%}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent)}label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.form-row{margin-bottom:18px}.page-container{max-width:960px;margin:0 auto;padding:32px 28px}.row{display:flex;gap:10px;flex-wrap:wrap}.row-end{justify-content:flex-end}.pill{display:inline-block;border-radius:4px;padding:2px 8px;font-size:11px}.pill-blue{background:var(--pill-blue-bg);color:var(--pill-blue-text)}.pill-green{background:var(--pill-green-bg);color:var(--pill-green-text)}.pill-yellow{background:var(--pill-yellow-bg);color:var(--pill-yellow-text)}.pill-purple{background:var(--pill-purple-bg);color:var(--pill-purple-text)}.pill-gray{background:var(--pill-gray-bg);color:var(--pill-gray-text)}