:root{--bg: #0b0b0e;--bg2: #111116;--bg3: #18181f;--border: #232330;--border2: #2e2e3e;--accent: #c8f135;--accent-dim: #9bbf28;--accent-bg: rgba(200,241,53,.08);--accent-bg2: rgba(200,241,53,.15);--text: #f0eff5;--text2: #8e8da8;--text3: #56556a;--red: #ff4e4e;--red-bg: rgba(255,78,78,.1);--blue: #5b8aff;--blue-bg: rgba(91,138,255,.1);--teal: #3de8b0;--teal-bg: rgba(61,232,176,.1);--orange: #ff8c42;--orange-bg: rgba(255,140,66,.1);--font-display: "Syne", sans-serif;--font-mono: "Space Mono", monospace;--radius: 8px;--radius-lg: 14px;--sidebar-w: 220px;--transition: .18s cubic-bezier(.4,0,.2,1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;background:var(--bg);color:var(--text);font-family:var(--font-display);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:4px}.app-shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:24px 0;overflow-y:auto}.sidebar-logo{padding:0 20px 24px;border-bottom:1px solid var(--border);margin-bottom:16px}.sidebar-logo .logo-mark{display:flex;align-items:center;gap:10px;text-decoration:none}.logo-icon{width:34px;height:34px;background:var(--accent);border-radius:8px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-weight:700;font-size:13px;color:#0b0b0e;letter-spacing:-.5px;flex-shrink:0}.logo-text{font-size:15px;font-weight:700;color:var(--text);letter-spacing:-.3px}.logo-text span{color:var(--accent)}.sidebar-nav{flex:1;padding:0 12px;display:flex;flex-direction:column;gap:2px}.nav-label{font-family:var(--font-mono);font-size:10px;color:var(--text3);letter-spacing:1.5px;text-transform:uppercase;padding:10px 8px 6px}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--radius);color:var(--text2);text-decoration:none;font-size:13.5px;font-weight:500;transition:all var(--transition);cursor:pointer;border:1px solid transparent}.nav-item svg{flex-shrink:0;opacity:.7}.nav-item:hover{background:var(--bg3);color:var(--text);border-color:var(--border)}.nav-item:hover svg{opacity:1}.nav-item.active{background:var(--accent-bg2);color:var(--accent);border-color:#c8f13533}.nav-item.active svg{opacity:1;color:var(--accent)}.sidebar-footer{padding:16px 20px 0;border-top:1px solid var(--border);margin-top:16px}.quota-bar-wrap{margin-top:8px}.quota-bar-track{height:3px;background:var(--border2);border-radius:2px;overflow:hidden;margin-top:6px}.quota-bar-fill{height:100%;background:var(--accent);border-radius:2px;transition:width .4s ease}.main-content{flex:1;overflow-y:auto;background:var(--bg)}.page-header{padding:32px 36px 24px;border-bottom:1px solid var(--border);display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.page-title{font-size:22px;font-weight:800;letter-spacing:-.5px;color:var(--text);line-height:1.2}.page-subtitle{font-size:13px;color:var(--text2);margin-top:4px;font-weight:400}.page-body{padding:32px 36px}.card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 22px}.card-sm{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px}.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 18px;border-radius:var(--radius);font-family:var(--font-display);font-size:13.5px;font-weight:600;cursor:pointer;transition:all var(--transition);border:1px solid transparent;text-decoration:none;white-space:nowrap}.btn-primary{background:var(--accent);color:#0b0b0e;border-color:var(--accent)}.btn-primary:hover{background:#d4ff40;transform:translateY(-1px);box-shadow:0 4px 16px #c8f13540}.btn-primary:active{transform:translateY(0)}.btn-ghost{background:transparent;color:var(--text2);border-color:var(--border2)}.btn-ghost:hover{background:var(--bg3);color:var(--text);border-color:var(--border2)}.btn-danger{background:var(--red-bg);color:var(--red);border-color:#ff4e4e33}.btn-danger:hover{background:#ff4e4e2e}.btn-lg{padding:12px 24px;font-size:15px}.btn-sm{padding:6px 12px;font-size:12px}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 9px;border-radius:20px;font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.3px}.badge-tiktok{background:var(--teal-bg);color:var(--teal)}.badge-youtube{background:var(--red-bg);color:var(--red)}.badge-science{background:var(--blue-bg);color:var(--blue)}.badge-general{background:var(--orange-bg);color:var(--orange)}.badge-easy{background:var(--teal-bg);color:var(--teal)}.badge-medium{background:var(--orange-bg);color:var(--orange)}.badge-hard{background:var(--red-bg);color:var(--red)}.badge-accent{background:var(--accent-bg2);color:var(--accent)}.form-group{display:flex;flex-direction:column;gap:8px}.form-label{font-family:var(--font-mono);font-size:11px;color:var(--text2);letter-spacing:1px;text-transform:uppercase}.form-input,.form-select,.form-textarea{background:var(--bg3);border:1px solid var(--border2);border-radius:var(--radius);padding:10px 14px;color:var(--text);font-family:var(--font-display);font-size:14px;outline:none;transition:border-color var(--transition);width:100%}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--accent)}.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238e8da8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.form-textarea{resize:vertical;min-height:90px;line-height:1.6}.form-range{-webkit-appearance:none;width:100%;height:4px;background:var(--border2);border-radius:2px;outline:none}.form-range::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid var(--bg);box-shadow:0 0 0 2px var(--accent)}.toggle-group{display:flex;background:var(--bg3);border:1px solid var(--border2);border-radius:var(--radius);overflow:hidden}.toggle-option{flex:1;display:flex;align-items:center;justify-content:center;gap:7px;padding:10px 14px;font-size:13px;font-weight:600;cursor:pointer;transition:all var(--transition);color:var(--text2);border:none;background:transparent;font-family:var(--font-display)}.toggle-option.active{background:var(--accent-bg2);color:var(--accent)}.toggle-option:hover:not(.active){background:var(--bg2);color:var(--text)}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px 20px}.stat-label{font-family:var(--font-mono);font-size:10px;color:var(--text3);letter-spacing:1px;text-transform:uppercase;margin-bottom:8px}.stat-value{font-size:28px;font-weight:800;letter-spacing:-1px;color:var(--text);line-height:1}.stat-sub{font-size:12px;color:var(--text3);margin-top:4px}.stat-card.accent{border-color:#c8f13533;background:var(--accent-bg)}.stat-card.accent .stat-value{color:var(--accent)}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.video-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition);cursor:pointer}.video-card:hover{border-color:var(--border2);transform:translateY(-2px);box-shadow:0 8px 32px #0006}.video-thumb{aspect-ratio:9/5;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.video-thumb-inner{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;font-size:12px;font-family:var(--font-mono)}.video-card-body{padding:12px 14px}.video-card-title{font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.video-card-meta{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.video-card-date{font-family:var(--font-mono);font-size:10px;color:var(--text3);margin-top:6px}.video-card-actions{display:flex;gap:6px;margin-top:10px}.quiz-question-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px 20px;transition:border-color var(--transition)}.quiz-question-card:hover{border-color:var(--border2)}.quiz-question-num{font-family:var(--font-mono);font-size:10px;color:var(--accent);letter-spacing:1px;margin-bottom:8px}.quiz-question-text{font-size:15px;font-weight:600;color:var(--text);margin-bottom:14px}.quiz-answers{display:grid;grid-template-columns:1fr 1fr;gap:8px}.quiz-answer{padding:9px 13px;border-radius:var(--radius);border:1px solid var(--border2);font-size:13px;color:var(--text2);background:var(--bg2)}.quiz-answer.correct{border-color:#3de8b04d;background:var(--teal-bg);color:var(--teal)}.steps{display:flex;align-items:center;gap:0;margin-bottom:32px}.step{display:flex;align-items:center;gap:8px}.step-dot{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:11px;font-weight:700;border:1px solid var(--border2);color:var(--text3);background:var(--bg3);flex-shrink:0}.step.active .step-dot{background:var(--accent);border-color:var(--accent);color:#0b0b0e}.step.done .step-dot{background:var(--accent-bg);border-color:var(--accent);color:var(--accent)}.step-label{font-size:12px;font-weight:600;color:var(--text3)}.step.active .step-label{color:var(--text)}.step-line{flex:1;height:1px;background:var(--border);margin:0 8px}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:20px;height:20px;border:2px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes pulse-accent{0%,to{opacity:1}50%{opacity:.5}}.pulse{animation:pulse-accent 1.8s ease-in-out infinite}.toast-wrap{position:fixed;bottom:24px;right:24px;z-index:100;display:flex;flex-direction:column;gap:8px}.toast{background:var(--bg2);border:1px solid var(--border2);border-radius:var(--radius);padding:12px 16px;display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text);min-width:260px;box-shadow:0 8px 32px #00000080}.toast.success{border-color:#3de8b04d}.toast.error{border-color:#ff4e4e4d}.divider{height:1px;background:var(--border);margin:24px 0}.section-title{font-size:11px;font-family:var(--font-mono);color:var(--text3);letter-spacing:1.2px;text-transform:uppercase;margin-bottom:14px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:60px 20px;color:var(--text3);text-align:center}.empty-state svg{opacity:.3}.empty-state p{font-size:13px;max-width:260px;line-height:1.6}.switch-wrap{display:flex;align-items:center;gap:10px;cursor:pointer}.switch{width:36px;height:20px;background:var(--border2);border-radius:10px;position:relative;transition:background var(--transition);flex-shrink:0}.switch.on{background:var(--accent)}.switch:after{content:"";position:absolute;top:3px;left:3px;width:14px;height:14px;background:var(--bg);border-radius:50%;transition:transform var(--transition)}.switch.on:after{transform:translate(16px);background:#0b0b0e}.switch-label{font-size:13.5px;color:var(--text);font-weight:500}@media(max-width:1024px){.stats-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:768px){.sidebar{display:none}.stats-grid{grid-template-columns:1fr 1fr}.page-body,.page-header{padding:20px}}