*,*:before,*:after{box-sizing:border-box}:root{--bg: #0f1117;--surface: #1a1d27;--surface2: #232736;--border: #2e3248;--text: #e2e8f0;--text-muted: #8892a4;--accent: #6c8ef5;--accent-hover: #8ba7ff;--success: #4ade80;--danger: #f87171;--warning: #fbbf24;--easy: #4ade80;--medium: #fbbf24;--hard: #f87171;font-family:Inter,system-ui,sans-serif;font-size:14px}html,body,#root{height:100%;margin:0;background:var(--bg);color:var(--text)}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover);text-decoration:underline}h1,h2,h3{margin:0 0 .5rem}pre{background:#0d0f16;border:1px solid var(--border);border-radius:6px;padding:.75rem;overflow-x:auto;font-size:12px;line-height:1.5;white-space:pre-wrap;word-break:break-word}.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.45rem 1rem;border:1px solid transparent;border-radius:6px;font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:background .15s,border-color .15s,color .15s;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.btn-secondary{background:var(--surface2);color:var(--text);border-color:var(--border)}.btn-secondary:hover:not(:disabled){border-color:var(--accent)}.btn-ghost{background:transparent;color:var(--text-muted);border-color:transparent}.btn-ghost:hover:not(:disabled){color:var(--text);background:var(--surface2)}.btn-link{background:none;border:none;color:var(--accent);cursor:pointer;padding:0;font:inherit;text-align:left}.btn-link:hover{color:var(--accent-hover);text-decoration:underline}.btn-icon{background:none;border:none;cursor:pointer;padding:0 .3rem;font-size:14px}.btn-danger-sm{background:transparent;color:var(--danger);border:1px solid var(--danger);border-radius:4px;padding:.2rem .6rem;font-size:12px;cursor:pointer}.btn-danger-sm:hover{background:var(--danger);color:#fff}.form-group{display:flex;flex-direction:column;gap:.3rem;margin-bottom:1rem}.form-group label{font-size:13px;color:var(--text-muted);font-weight:500}input[type=text],input[type=email],input[type=password],input[type=number],select{background:var(--surface);border:1px solid var(--border);border-radius:6px;color:var(--text);font-family:inherit;font-size:14px;padding:.5rem .75rem;outline:none;width:100%}input:focus,select:focus{border-color:var(--accent)}.form-error{color:var(--danger);font-size:13px;margin:.25rem 0}.badge{display:inline-block;padding:.15rem .5rem;border-radius:12px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;border:1px solid transparent}.badge-success{background:#14532d;color:var(--success);border-color:#166534}.badge-pending{background:#1c1917;color:var(--warning);border-color:#78350f}.badge-link{text-decoration:none;cursor:pointer}.badge-link:hover{filter:brightness(1.2)}.badge-topic{background:var(--surface2);color:var(--accent);border-color:var(--border)}.difficulty-easy{color:var(--easy)}.difficulty-medium{color:var(--medium)}.difficulty-hard{color:var(--hard)}.loading{padding:2rem;text-align:center;color:var(--text-muted)}.auth-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg);padding:1rem}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:2rem;width:100%;max-width:400px}.auth-title{font-size:1.8rem;text-align:center;color:var(--accent);margin-bottom:.25rem}.auth-subtitle{text-align:center;color:var(--text-muted);margin-bottom:1.5rem}.auth-form{display:flex;flex-direction:column}.auth-link{text-align:center;margin-top:1rem;color:var(--text-muted);font-size:13px}.dashboard{max-width:1100px;margin:0 auto;padding:0 1.5rem 2rem}.dashboard-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 0;border-bottom:1px solid var(--border);margin-bottom:1.5rem;gap:1rem;flex-wrap:wrap}.header-left h1{font-size:1.4rem;color:var(--accent);display:flex;align-items:center;gap:.5rem}.nav-logo{width:28px;height:28px;image-rendering:pixelated;flex-shrink:0}.nav-logo-sm{width:20px;height:20px;image-rendering:pixelated;flex-shrink:0;vertical-align:middle}.welcome{color:var(--text-muted);font-size:13px}.header-nav{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:2rem}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:1.5rem;text-align:center}.stat-value{font-size:2.5rem;font-weight:700;color:var(--accent);line-height:1}.stat-label{color:var(--text-muted);font-size:13px;margin-top:.4rem}.topic-stats{margin-bottom:2rem}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:.75rem;margin-top:.75rem}.topic-card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.75rem}.topic-name{font-size:13px;font-weight:500;margin-bottom:.25rem}.topic-progress{font-size:12px;color:var(--text-muted)}.history-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.filter-toggle{display:flex;align-items:center;gap:.4rem;font-size:13px;color:var(--text-muted);cursor:pointer}.empty-state{color:var(--text-muted);padding:2rem;text-align:center}.history-table{width:100%;border-collapse:collapse}.history-table th,.history-table td{text-align:left;padding:.6rem .75rem;border-bottom:1px solid var(--border);font-size:13px}.history-table th{color:var(--text-muted);font-weight:500}.problem-layout{display:flex;flex-direction:column;height:100vh;overflow:hidden}.problem-header{display:flex;align-items:center;gap:.75rem;padding:.5rem 1rem;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0;flex-wrap:wrap}.header-right{display:flex;align-items:center;gap:.5rem;margin-left:auto}.welcome-small{color:var(--text-muted);font-size:12px}.problem-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:1rem;color:var(--text-muted)}.problem-body{display:flex;flex-direction:column;flex:1;overflow:hidden}.snippet-info{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background:var(--surface2);border-bottom:1px solid var(--border);flex-shrink:0;flex-wrap:wrap}.snippet-title{font-weight:600;font-size:14px}.editor-output-split{display:grid;grid-template-columns:1fr 380px;flex:1;overflow:hidden}.editor-pane{overflow:hidden;border-right:1px solid var(--border)}.output-pane{display:flex;flex-direction:column;background:var(--surface);overflow-y:auto;padding:1rem;gap:.75rem}.run-controls{display:flex;gap:.5rem;flex-wrap:wrap}.output-placeholder{color:var(--text-muted);font-size:13px;line-height:1.6}.code-output{background:var(--bg);border:1px solid var(--border);border-radius:6px;overflow:hidden}.code-output-label{font-size:11px;font-weight:600;color:var(--text-muted);padding:.4rem .75rem;border-bottom:1px solid var(--border);text-transform:uppercase;letter-spacing:.05em}.code-output-stdout{margin:0;padding:.6rem .75rem;font-size:13px;font-family:monospace;white-space:pre-wrap;word-break:break-all;color:var(--text)}.code-output-error{margin:0;padding:.6rem .75rem;font-size:13px;font-family:monospace;white-space:pre-wrap;word-break:break-all;color:#f87171}.code-output-empty{display:block;padding:.6rem .75rem;font-size:13px;color:var(--text-muted);font-style:italic}.snippet-selector{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}.selector-group{display:flex;align-items:center;gap:.4rem}.selector-group label{font-size:12px;color:var(--text-muted);white-space:nowrap}.selector-group select{width:auto;padding:.35rem .6rem;font-size:13px}.test-results{display:flex;flex-direction:column;gap:.5rem}.overall-status{font-weight:600;padding:.5rem .75rem;border-radius:6px;font-size:13px}.status-pass{background:#14532d;color:var(--success)}.status-fail{background:#450a0a;color:var(--danger)}.test-list{display:flex;flex-direction:column;gap:.4rem}.test-item{border-radius:6px;padding:.5rem .75rem;font-size:12px;border:1px solid var(--border)}.test-pass{background:#052e16;border-color:#166534}.test-fail{background:#2d0707;border-color:#991b1b}.test-name{display:flex;align-items:center;gap:.4rem;font-weight:500;margin-bottom:.25rem}.test-icon{font-style:normal}.test-output{margin:.25rem 0 0;color:var(--text-muted)}.test-error{margin:.25rem 0 0;color:var(--danger)}.admin-layout{display:flex;height:100vh;overflow:hidden}.admin-sidebar{width:200px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:1rem 0}.admin-logo{padding:0 1rem 1.5rem;font-size:1.1rem;font-weight:700;color:var(--accent)}.admin-logo a{color:inherit;text-decoration:none}.admin-nav{display:flex;flex-direction:column;flex:1;gap:.15rem;padding:0 .5rem}.admin-nav-link{display:block;padding:.5rem .75rem;border-radius:6px;color:var(--text-muted);font-size:13px;font-weight:500;text-decoration:none;transition:background .15s,color .15s}.admin-nav-link:hover{background:var(--surface2);color:var(--text)}.admin-nav-link.active{background:var(--surface2);color:var(--accent)}.admin-footer{padding:1rem;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:.5rem;font-size:12px;color:var(--text-muted)}.admin-content{flex:1;overflow-y:auto;padding:1.5rem}.admin-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;flex-wrap:wrap;gap:.75rem}.admin-actions{display:flex;align-items:center;gap:.5rem}.admin-filters{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}.admin-filters select{width:auto;padding:.35rem .6rem;font-size:13px}.admin-table{width:100%;border-collapse:collapse;font-size:13px}.admin-table th,.admin-table td{text-align:left;padding:.6rem .75rem;border-bottom:1px solid var(--border)}.admin-table th{color:var(--text-muted);font-weight:500}.admin-table tr:last-child td{border-bottom:none}.admin-table code{font-size:12px;background:var(--surface2);padding:.15rem .4rem;border-radius:4px}.row-inactive{opacity:.5}.toggle-btn{background:var(--surface2);border:1px solid var(--border);border-radius:4px;color:var(--text-muted);cursor:pointer;font-size:12px;padding:.2rem .6rem}.toggle-btn.active{color:var(--success);border-color:#166534;background:#052e16}.toggle-btn:disabled{opacity:.4;cursor:not-allowed}.count-badge{font-size:12px;color:var(--text-muted);padding:.2rem .6rem;background:var(--surface2);border-radius:12px}.count-input{width:70px}.snippet-detail-row td{background:var(--surface2)}.snippet-detail{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1rem;padding:.5rem 0}.detail-section strong{display:block;margin-bottom:.4rem;font-size:12px;color:var(--text-muted)}.detail-section pre{max-height:200px;overflow-y:auto}.generate-form{display:flex;gap:1rem;flex-wrap:wrap;align-items:flex-end;margin-bottom:1rem}.generate-form .form-group{margin-bottom:0}.generate-note{font-size:12px;color:var(--text-muted);margin-bottom:1.5rem}.jobs-list{display:flex;flex-direction:column;gap:.75rem;margin-top:.5rem}.job-item{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.75rem 1rem}.job-header{display:flex;align-items:center;justify-content:space-between;gap:.5rem}.job-id{font-weight:500;font-size:13px}.job-detail{font-size:12px;color:var(--text-muted);margin:.25rem 0 0}.job-error{font-size:12px;color:var(--danger);margin:.25rem 0 0}.job-badge-pending{background:#1c1917;color:var(--warning);border-color:#78350f}.job-badge-running{background:#1e3a5f;color:#60a5fa;border-color:#1d4ed8}.job-badge-done{background:#14532d;color:var(--success);border-color:#166534}.job-badge-failed{background:#450a0a;color:var(--danger);border-color:#991b1b}