:root{--bg: #0f1117;--panel: #171a21;--border: #262b36;--text: #e6e8ec;--muted: #9aa1ac;--accent: #5b9dff;--ok: #2ec16b;--bad: #ef4d4d;--warn: #e0a133}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,sans-serif}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.app-header{padding:14px 24px;border-bottom:1px solid var(--border);background:var(--panel)}.brand{font-weight:700;font-size:18px;color:var(--text)}.app-main{max-width:1100px;margin:0 auto;padding:24px}.problem-table{width:100%;border-collapse:collapse}.problem-table th,.problem-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}.problem-table th{color:var(--muted);font-weight:600}.difficulty{font-size:13px;font-weight:600}.difficulty--easy{color:var(--ok)}.difficulty--medium{color:var(--warn)}.difficulty--hard{color:var(--bad)}.problem-detail{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}@media (max-width: 800px){.problem-detail{grid-template-columns:1fr}}.statement h1{font-size:22px}.markdown{white-space:pre-wrap;font-family:inherit;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:16px;line-height:1.5}.samples{margin-top:16px}.sample{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}.sample pre{background:#0b0d12;border:1px solid var(--border);border-radius:6px;padding:8px 10px;margin:4px 0 0}.editor-panel{display:flex;flex-direction:column}.editor-label{color:var(--muted);font-size:13px;margin-bottom:6px}.editor{width:100%;min-height:340px;resize:vertical;background:#0b0d12;color:var(--text);border:1px solid var(--border);border-radius:8px;padding:12px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:13px;line-height:1.5;-moz-tab-size:4;tab-size:4}.submit-btn{margin-top:12px;align-self:flex-start;background:var(--accent);color:#06122b;font-weight:700;border:none;border-radius:8px;padding:10px 20px;cursor:pointer}.submit-btn:disabled{opacity:.6;cursor:default}.result{margin-top:16px;border:1px solid var(--border);border-radius:8px;padding:12px;background:var(--panel)}.result-head{display:flex;align-items:center;gap:12px}.result-meta{color:var(--muted);font-size:13px}.result-detail{margin-top:10px;white-space:pre-wrap;background:#0b0d12;border:1px solid var(--border);border-radius:6px;padding:10px;color:#ffb4b4;font-size:12px}.verdict{display:inline-block;padding:4px 10px;border-radius:999px;font-weight:700;font-size:13px}.verdict--ok{background:#2ec16b26;color:var(--ok)}.verdict--bad{background:#ef4d4d26;color:var(--bad)}.verdict--warn{background:#e0a13326;color:var(--warn)}.verdict--pending{background:#9aa1ac26;color:var(--muted)}.error{color:var(--bad)}