:root{--bg-primary: #0f0f23;--bg-secondary: #1a1a3e;--bg-card: #1e1e45;--bg-card-hover: #252560;--bg-input: #16163a;--text-primary: #e8e8f0;--text-secondary: #9494b8;--text-muted: #6a6a8e;--accent-blue: #4f7cff;--accent-blue-hover: #6b91ff;--accent-purple: #8b5cf6;--accent-green: #10b981;--accent-yellow: #f59e0b;--accent-red: #ef4444;--accent-cyan: #06b6d4;--border-color: #2a2a5a;--border-active: #4f7cff;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(79, 124, 255, .15);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--transition: all .25s cubic-bezier(.4, 0, .2, 1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;-webkit-font-smoothing:antialiased}.app-layout{display:flex;flex-direction:column;min-height:100vh}.app-header{background:linear-gradient(135deg,var(--bg-secondary),var(--bg-card));border-bottom:1px solid var(--border-color);padding:16px 32px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.app-header h1{font-size:20px;font-weight:700;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.app-header .subtitle{font-size:12px;color:var(--text-muted);font-weight:400}.app-main{flex:1;padding:32px;max-width:1400px;margin:0 auto;width:100%}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:24px;transition:var(--transition)}.card:hover{border-color:var(--border-active);box-shadow:var(--shadow-glow)}.card-header{display:flex;align-items:center;gap:12px;margin-bottom:16px}.card-header h2{font-size:18px;font-weight:600}.card-header .icon{font-size:24px}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:var(--radius-md);font-family:Inter,sans-serif;font-size:14px;font-weight:600;cursor:pointer;border:none;transition:var(--transition);text-decoration:none}.btn:active{transform:scale(.97)}.btn-primary{background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));color:#fff;box-shadow:0 4px 15px #4f7cff4d}.btn-primary:hover{box-shadow:0 6px 25px #4f7cff73;transform:translateY(-1px)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.btn-secondary{background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{border-color:var(--accent-blue);background:var(--bg-card)}.btn-danger{background:#ef444426;color:var(--accent-red);border:1px solid rgba(239,68,68,.3)}.btn-danger:hover{background:#ef444440}.btn-sm{padding:8px 16px;font-size:13px}.btn-lg{padding:16px 32px;font-size:16px}.btn-icon{padding:10px}.stages-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;margin-top:24px}.stage-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:28px;cursor:pointer;transition:var(--transition);position:relative;overflow:hidden}.stage-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-blue),var(--accent-purple));opacity:0;transition:var(--transition)}.stage-card:hover{border-color:var(--accent-blue);transform:translateY(-2px);box-shadow:var(--shadow-glow)}.stage-card:hover:before{opacity:1}.stage-card.disabled{opacity:.45;cursor:not-allowed;pointer-events:none}.stage-card .stage-icon{font-size:36px;margin-bottom:12px}.stage-card h3{font-size:16px;font-weight:600;margin-bottom:8px}.stage-card p{font-size:13px;color:var(--text-secondary);line-height:1.5}.stage-card .stage-status{margin-top:16px;display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:4px 12px;border-radius:20px;font-weight:500}.stage-status.ready{background:#10b98126;color:var(--accent-green)}.stage-status.no-data{background:#f59e0b26;color:var(--accent-yellow)}.stage-status.done{background:#4f7cff26;color:var(--accent-blue)}.upload-zone{border:2px dashed var(--border-color);border-radius:var(--radius-lg);padding:48px 32px;text-align:center;cursor:pointer;transition:var(--transition)}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--accent-blue);background:#4f7cff0d}.upload-zone .upload-icon{font-size:48px;margin-bottom:16px}.upload-zone p{color:var(--text-secondary)}.student-list{display:flex;flex-direction:column;gap:12px}.student-item{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:16px 20px;display:flex;align-items:center;justify-content:space-between;cursor:pointer;transition:var(--transition)}.student-item:hover{border-color:var(--accent-blue);background:var(--bg-card-hover)}.student-item .info{display:flex;align-items:center;gap:16px}.student-item .avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:#fff}.student-item .meta{display:flex;gap:16px;align-items:center}.student-item .meta .tag{font-size:12px;padding:3px 10px;border-radius:20px;background:#4f7cff1f;color:var(--accent-blue)}.result-section{margin-bottom:24px}.result-section h3{font-size:15px;font-weight:600;margin-bottom:12px;display:flex;align-items:center;gap:8px}.traffic-light{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:var(--radius-md);font-weight:600;font-size:14px}.traffic-light.green{background:#10b98126;color:var(--accent-green)}.traffic-light.yellow{background:#f59e0b26;color:var(--accent-yellow)}.traffic-light.red{background:#ef444426;color:var(--accent-red)}.scale-bar{display:flex;align-items:center;gap:12px;margin-bottom:10px}.scale-bar .label{font-size:13px;min-width:220px;color:var(--text-secondary)}.scale-bar .bar-track{flex:1;height:8px;background:var(--bg-input);border-radius:4px;overflow:hidden}.scale-bar .bar-fill{height:100%;border-radius:4px;transition:width .8s ease}.scale-bar .bar-fill.low{background:var(--accent-red)}.scale-bar .bar-fill.medium{background:var(--accent-yellow)}.scale-bar .bar-fill.high{background:var(--accent-green)}.scale-bar .value{font-size:13px;font-weight:600;min-width:32px;text-align:right}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}.info-card{background:var(--bg-input);border-radius:var(--radius-md);padding:16px}.info-card h4{font-size:13px;color:var(--text-muted);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.info-card ul{list-style:none;padding:0}.info-card li{font-size:13px;color:var(--text-secondary);position:relative;padding:4px 0 4px 16px}.info-card li:before{content:"›";position:absolute;left:0;color:var(--accent-blue);font-weight:700}.spinner{display:inline-block;width:20px;height:20px;border:2px solid var(--border-color);border-top-color:var(--accent-blue);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f0f23cc;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.loading-overlay .spinner{width:40px;height:40px;border-width:3px}.loading-overlay p{color:var(--text-secondary);font-size:14px}.textarea-json{width:100%;min-height:200px;background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:16px;color:var(--text-primary);font-family:JetBrains Mono,Fira Code,monospace;font-size:13px;resize:vertical;outline:none;transition:var(--transition)}.textarea-json:focus{border-color:var(--accent-blue)}.toast{position:fixed;bottom:24px;right:24px;padding:14px 20px;border-radius:var(--radius-md);font-size:14px;z-index:2000;animation:slideIn .3s ease;max-width:400px}.toast.success{background:#10b981e6;color:#fff}.toast.error{background:#ef4444e6;color:#fff}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}@media(max-width:768px){.app-main{padding:16px}.stages-grid,.info-grid{grid-template-columns:1fr}.app-header{padding:12px 16px}}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-secondary);text-decoration:none;font-size:14px;margin-bottom:20px;transition:var(--transition)}.back-link:hover{color:var(--accent-blue)}.tabs{display:flex;gap:4px;background:var(--bg-input);padding:4px;border-radius:var(--radius-md);margin-bottom:24px}.tab{flex:1;padding:10px 20px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;text-align:center;cursor:pointer;transition:var(--transition);border:none;background:transparent;color:var(--text-secondary);font-family:Inter,sans-serif}.tab:hover{color:var(--text-primary)}.tab.active{background:var(--accent-blue);color:#fff;box-shadow:var(--shadow-sm)}.summary-box{background:linear-gradient(135deg,#4f7cff14,#8b5cf614);border:1px solid rgba(79,124,255,.2);border-radius:var(--radius-lg);padding:20px;margin-bottom:24px;font-size:14px;line-height:1.7;color:var(--text-primary)}.cost-badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:4px 10px;border-radius:20px;background:#06b6d41f;color:var(--accent-cyan)}.btn-delete-result{background:none;border:none;cursor:pointer;font-size:14px;padding:4px 8px;border-radius:var(--radius-sm);opacity:.4;transition:var(--transition)}.btn-delete-result:hover{opacity:1;background:#ef444426}