@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap";:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--primary-glow: rgba(79, 70, 229, .15);--accent: #0ea5e9;--accent-hover: #0284c7;--accent-light: #e0f2fe;--success: #10b981;--success-light: #d1fae5;--warning: #f59e0b;--warning-light: #fef3c7;--danger: #ef4444;--danger-hover: #dc2626;--danger-light: #fee2e2;--bg-body: #f8fafc;--bg-card: #ffffff;--bg-hover: #f9fafb;--bg-glass: rgba(255, 255, 255, .95);--text-main: #1e293b;--text-muted: #64748b;--text-light: #94a3b8;--border: #e2e8f0;--border-hover: #cbd5e1;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--radius-sm: 6px;--radius: 12px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg-body);color:var(--text-main);line-height:1.6;overflow-x:hidden;min-height:100vh}.app-container{min-height:100vh;padding:20px;display:flex;flex-direction:column;align-items:center}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2;letter-spacing:-.025em}h1{font-size:clamp(1.875rem,4vw,2.5rem);margin-bottom:20px;color:var(--primary);font-weight:800}h2{font-size:clamp(1.5rem,3vw,1.875rem);color:var(--primary);margin-bottom:16px;font-weight:700}h3{font-size:clamp(1.125rem,2vw,1.25rem);color:var(--text-main);margin-bottom:12px;font-weight:600}.main-container{width:100%;max-width:1400px;display:flex;flex-direction:column;gap:20px}.card{background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow-md);padding:24px;transition:all var(--transition)}.card:hover{box-shadow:var(--shadow-lg);border-color:var(--border-hover)}.trainer-layout{display:flex;height:750px;min-height:750px;gap:0;background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow-lg);overflow:hidden;position:relative}.left-panel{padding:24px;overflow-y:auto;display:flex;flex-direction:column;gap:20px;background:#fafafa;border-right:1px solid var(--border);flex-shrink:0}.right-panel{padding:0;position:relative;background:#fff;flex:1;min-width:0;display:flex;flex-direction:column}.resizer{width:10px;background-color:var(--border);cursor:col-resize;display:flex;align-items:center;justify-content:center;transition:background-color var(--transition);position:relative;flex-shrink:0}.resizer:hover{background-color:var(--accent)}.resizer:hover:after{background-color:#fff}.resizer:after{content:"";height:40px;width:4px;background-color:#9ca3af;border-radius:2px;transition:background-color var(--transition)}.resizing{-webkit-user-select:none;user-select:none;cursor:col-resize}.resizing .calculator-container,.resizing .calculator-container *{pointer-events:none!important}.calculator-container{position:relative;width:100%;height:100%;overflow:hidden;background:#fff;flex:1}.calculator-wrapper{width:100%!important;height:100%!important;min-height:100%;position:relative}.calculator-wrapper>div{width:100%!important;height:100%!important}.reset-button-overlay{position:absolute;top:10px;right:10px;z-index:100}.reset-btn{background:#fff;border:2px solid var(--border);border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:20px;color:var(--text-muted);box-shadow:var(--shadow-md);transition:all var(--transition)}.reset-btn:hover{background:var(--danger);color:#fff;border-color:var(--danger);transform:rotate(90deg)}.btn{background-color:var(--primary);color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-sm);font-weight:600;font-size:14px;cursor:pointer;transition:all var(--transition);box-shadow:var(--shadow-sm);font-family:Inter,sans-serif}.btn:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn:active{transform:translateY(0)}.btn-danger{background-color:var(--danger)}.btn-danger:hover{background-color:var(--danger-hover)}.btn-outline{background:#fff;border:2px solid var(--primary);color:var(--primary);box-shadow:none}.btn-outline:hover{background:var(--primary);color:#fff}input[type=text]{padding:12px;border:2px solid var(--border);background:#fff;border-radius:var(--radius-sm);font-size:1rem;width:200px;font-family:Inter,sans-serif;transition:all var(--transition)}input[type=text]:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}input[type=text]::placeholder{color:var(--text-light)}.category-header{display:flex;justify-content:space-between;align-items:center;cursor:pointer;-webkit-user-select:none;user-select:none}.category-header:hover h3{color:var(--primary-hover)}.category-selection{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px;margin-top:15px;max-height:300px;overflow-y:auto;padding:5px}.cat-item{display:flex;align-items:flex-start;gap:8px;padding:8px;border-radius:var(--radius-sm);background:#f9fafb;border:1px solid var(--border);transition:all var(--transition)}.cat-item:hover{background:#f3f4f6;border-color:var(--primary-light);transform:translate(2px)}.cat-item input[type=checkbox]{margin-top:2px;width:16px;height:16px;cursor:pointer;accent-color:var(--primary)}.cat-item label{cursor:pointer;font-size:.9rem;line-height:1.4}.category-buttons{margin-top:15px;display:flex;gap:10px;justify-content:center}.badge{padding:2px 8px;border-radius:12px;font-size:.75rem;font-weight:700;margin-right:6px;text-transform:uppercase}.badge-easy{background:#d1fae5;color:#065f46}.badge-medium{background:#ffedd5;color:#9a3412}.badge-hard{background:#fee2e2;color:#991b1b}.question-box{font-size:1.2rem;line-height:1.6;text-align:center;min-height:100px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,#f8fafc,#f1f5f9);border:1px dashed #cbd5e1;border-radius:var(--radius);padding:20px;transition:all var(--transition);overflow-wrap:break-word;word-break:break-word;width:100%;max-width:100%;overflow-x:auto}.question-box:hover{border-color:var(--primary);background:linear-gradient(135deg,#f8fafc,#eef2ff);box-shadow:0 4px 12px #4f46e51a}.category-title{color:var(--accent);font-size:1rem;margin-bottom:12px;font-weight:600}.input-area{display:flex;gap:10px;justify-content:center;align-items:center}.result-area{min-height:40px;font-size:1.5rem;font-weight:700;text-align:center;margin-top:10px;transition:all var(--transition)}.result-area.success{color:var(--success)}.result-area.error{color:var(--danger);animation:shake .5s ease-in-out}.result-area.warning{color:var(--warning)}@keyframes shake{0%,to{transform:translate(0)}10%,30%,50%,70%,90%{transform:translate(-4px)}20%,40%,60%,80%{transform:translate(4px)}}.tips-list{padding-left:20px;color:var(--text-muted);line-height:1.5}.tips-list li{margin-bottom:8px}.stopwatch{position:fixed;top:20px;right:20px;background:#fff;padding:8px 16px;border-radius:20px;font-weight:700;box-shadow:var(--shadow-md);font-family:JetBrains Mono,monospace;font-size:1.2rem;z-index:100;border:1px solid var(--border)}.help-button{position:fixed;top:20px;left:20px;width:40px;height:40px;border-radius:50%;background:var(--primary);color:#fff;font-weight:700;font-size:20px;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow-md);z-index:100;transition:transform var(--transition);border:none}.help-button:hover{transform:scale(1.1)}.correct-counter{font-size:1.2rem;background:var(--success-light);color:#065f46;padding:8px 24px;border-radius:50px;margin-bottom:10px;display:inline-block;font-weight:600;border:1px solid #6ee7b7}.streak{margin-left:10px;color:var(--warning)}.control-buttons{text-align:center;padding:10px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.times-list{list-style:none;padding:0}.times-list li{border-bottom:1px solid var(--border);padding:8px 0}.explanation-img{width:100%;height:auto;border-radius:var(--radius)}.help-content p{margin-bottom:10px}.help-content ul{margin-left:20px}.help-content li{margin-bottom:5px}.left-panel::-webkit-scrollbar,.category-selection::-webkit-scrollbar{width:8px}.left-panel::-webkit-scrollbar-track,.category-selection::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}.left-panel::-webkit-scrollbar-thumb,.category-selection::-webkit-scrollbar-thumb{background:#888;border-radius:4px}.left-panel::-webkit-scrollbar-thumb:hover,.category-selection::-webkit-scrollbar-thumb:hover{background:#555}@media(max-width:900px){.trainer-layout{flex-direction:column;height:auto}.resizer{width:100%;height:5px;cursor:row-resize}.resizer:after{width:40px;height:4px}.left-panel{width:100%!important;height:auto!important;border-right:none;border-bottom:1px solid var(--border)}.right-panel{width:100%!important;height:500px!important}.input-area{flex-direction:column}input[type=text]{width:100%}.control-buttons{flex-direction:column}.control-buttons .btn{width:100%}}hr{border:0;border-top:1px solid var(--border);width:100%;margin:16px 0}