@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--primary: #6366f1;--primary-dark: #4f46e5;--primary-light: #818cf8;--primary-bg: #eef2ff;--success: #10b981;--success-bg: #d1fae5;--danger: #ef4444;--danger-bg: #fee2e2;--warning: #f59e0b;--warning-bg: #fef3c7;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--bg: #0f172a;--bg-card: #1e293b;--bg-card-hover: #334155;--bg-input: #0f172a;--text: #f1f5f9;--text-muted: #94a3b8;--border: #334155;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, .4);--radius: 12px;--radius-sm: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6}#app{min-height:100vh}.navbar{background:#1e293bcc;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:0 2rem;position:sticky;top:0;z-index:100}.navbar-inner{max-width:1400px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:64px}.navbar-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:700;font-size:1.2rem}.navbar-brand .icon{font-size:1.5rem}.navbar-links{display:flex;gap:4px}.navbar-links a{text-decoration:none;color:var(--text-muted);padding:8px 16px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;transition:all .2s}.navbar-links a:hover,.navbar-links a.router-link-active{color:var(--primary-light);background:#6366f11a}.main-content{max-width:1400px;margin:0 auto;padding:2rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;transition:all .2s}.card:hover{border-color:var(--primary);box-shadow:var(--shadow)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.card-title{font-size:1.1rem;font-weight:600;color:var(--text)}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;border:none;cursor:pointer;transition:all .2s;text-decoration:none;font-family:inherit}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px #6366f166}.btn-success{background:var(--success);color:#fff}.btn-success:hover{background:#059669;transform:translateY(-1px)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:#dc2626}.btn-outline{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn-outline:hover{border-color:var(--primary);color:var(--primary-light)}.btn-sm{padding:6px 12px;font-size:.8rem}.btn-icon{width:36px;height:36px;padding:0;display:flex;align-items:center;justify-content:center;border-radius:8px}.form-group{margin-bottom:1.25rem}.form-label{display:block;font-size:.85rem;font-weight:500;color:var(--text-muted);margin-bottom:6px}.form-input,.form-textarea,.form-select{width:100%;padding:10px 14px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:.95rem;font-family:inherit;transition:border-color .2s}.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.form-textarea{min-height:100px;resize:vertical}.math-editor{position:relative}.math-toolbar{display:flex;flex-wrap:wrap;gap:4px;padding:8px;background:#0f172a80;border:1px solid var(--border);border-bottom:none;border-radius:var(--radius-sm) var(--radius-sm) 0 0}.math-toolbar button{padding:6px 10px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;color:var(--text);cursor:pointer;font-size:.85rem;transition:all .15s;font-family:Times New Roman,serif}.math-toolbar button:hover{background:var(--primary);border-color:var(--primary);color:#fff}.math-textarea{border-radius:0 0 var(--radius-sm) var(--radius-sm);border-top:none}.math-preview{padding:12px;background:#0f172a4d;border:1px solid var(--border);border-top:none;border-radius:0 0 var(--radius-sm) var(--radius-sm);min-height:40px;font-size:1.1rem}.answer-row{display:flex;align-items:flex-start;gap:12px;padding:12px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:8px;transition:all .2s}.answer-row:hover{border-color:var(--primary)}.answer-row.correct{border-color:var(--success);background:#10b9810d}.answer-label{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:var(--bg-card);border:2px solid var(--border);font-weight:600;font-size:.9rem;color:var(--text-muted);cursor:pointer;transition:all .2s;flex-shrink:0}.answer-label.selected{background:var(--success);border-color:var(--success);color:#fff}.answer-content{flex:1;min-width:0}.answer-remove{flex-shrink:0}.duplicate-warning{background:#f59e0b1a;border:1px solid var(--warning);border-radius:var(--radius-sm);padding:16px;margin-bottom:1rem}.duplicate-warning h4{color:var(--warning);margin-bottom:8px;display:flex;align-items:center;gap:8px}.duplicate-item{background:#0003;border-radius:6px;padding:10px;margin-top:8px}.duplicate-score{display:inline-block;padding:2px 8px;border-radius:4px;font-size:.8rem;font-weight:600}.duplicate-score.high{background:var(--danger-bg);color:var(--danger)}.duplicate-score.medium{background:var(--warning-bg);color:#b45309}.question-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;margin-bottom:1rem;transition:all .2s}.question-card:hover{border-color:var(--primary);box-shadow:var(--shadow)}.question-number{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:var(--primary);color:#fff;border-radius:8px;font-weight:600;font-size:.85rem;margin-right:12px}.question-content{font-size:1rem;line-height:1.7;color:var(--text)}.question-meta{display:flex;align-items:center;gap:12px;margin-top:10px}.badge{padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:500}.badge-primary{background:var(--primary-bg);color:var(--primary)}.badge-success{background:var(--success-bg);color:#065f46}.checkbox-wrapper{display:flex;align-items:center;gap:8px;cursor:pointer}.checkbox-wrapper input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary)}.pagination{display:flex;justify-content:center;gap:4px;margin-top:1.5rem}.pagination button{padding:8px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;color:var(--text-muted);cursor:pointer;transition:all .2s}.pagination button:hover,.pagination button.active{background:var(--primary);border-color:var(--primary);color:#fff}.pagination button:disabled{opacity:.4;cursor:not-allowed}.toast{position:fixed;top:80px;right:20px;padding:14px 20px;border-radius:var(--radius-sm);font-size:.9rem;z-index:1000;animation:slideIn .3s ease-out;box-shadow:var(--shadow-lg)}.toast-success{background:var(--success);color:#fff}.toast-error{background:var(--danger);color:#fff}.toast-warning{background:var(--warning);color:var(--gray-900)}@keyframes slideIn{0%{transform:translate(100px);opacity:0}to{transform:translate(0);opacity:1}}.spinner{display:inline-block;width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:3rem;color:var(--text-muted)}.empty-state .icon{font-size:3rem;margin-bottom:1rem}@media(max-width:768px){.main-content{padding:1rem}.navbar{padding:0 1rem}.navbar-links a{padding:6px 10px;font-size:.8rem}}.hero{text-align:center;padding:4rem 2rem}.hero h1{font-size:2.5rem;font-weight:700;background:linear-gradient(135deg,var(--primary-light),#a78bfa,#f472b6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:1rem}.hero p{color:var(--text-muted);font-size:1.1rem;max-width:600px;margin:0 auto 2rem}.hero-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;max-width:900px;margin:0 auto}.hero-card{padding:2rem;text-align:center}.hero-card .icon{font-size:2rem;margin-bottom:1rem}.hero-card h3{margin-bottom:.5rem;color:var(--text)}.hero-card p{font-size:.9rem;color:var(--text-muted)}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem}.page-header h2{font-size:1.5rem;font-weight:600}.export-preview{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);padding:1.5rem;font-family:Courier New,monospace;font-size:.9rem;white-space:pre-wrap;max-height:500px;overflow-y:auto}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--gray-600);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--gray-500)}