:root{color-scheme:dark;--bg:#0b1020;--bg-2:#11172e;--fg:#e8ecff;--muted:#93a1c8;--accent:#7c5cff;--accent-2:#19c37d;--danger:#ff5970;--warn:#ffb84d;--border:#2a3358}*{box-sizing:border-box}body,html{margin:0;padding:0;background:radial-gradient(circle at top,var(--bg-2),var(--bg));color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;min-height:100vh}button{font:inherit;background:var(--accent);color:white;border:0;border-radius:8px;padding:10px 16px;cursor:pointer;transition:opacity .12s,transform .12s}button:hover{opacity:.9}button:active{transform:translateY(1px)}button:disabled{opacity:.5;cursor:not-allowed}button.secondary{background:var(--bg-2);border:1px solid var(--border);color:var(--fg)}button.danger{background:var(--danger)}button.success{background:var(--accent-2)}input,textarea{font:inherit;background:var(--bg-2);color:var(--fg);border:1px solid var(--border);border-radius:8px;padding:10px 12px;width:100%}input:focus,textarea:focus{outline:2px solid var(--accent);border-color:transparent}.shell{max-width:1280px;margin:0 auto;padding:24px 20px}.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);grid-gap:16px;gap:16px;align-items:start}@media (max-width:900px){.split{grid-template-columns:1fr}}.problem-desc code{font-family:Fira Code,Menlo,monospace}.admin-panel{border-color:var(--accent);background:rgba(124,92,255,.06)}.group-row{padding:8px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);gap:8px}.you-chip{display:inline-flex;align-items:center;gap:6px;font-size:13px}.you-chip .dot{display:inline-block;width:10px;height:10px;border-radius:50%;box-shadow:0 0 0 2px var(--bg)}.tab-bar{display:flex;gap:4px;border-bottom:1px solid var(--border);padding:0 4px}.tab-bar .tab{background:transparent;color:var(--muted);padding:8px 14px;border:0;border-radius:8px 8px 0 0;border-bottom:2px solid transparent;font-size:13px;cursor:pointer;transition:color .12s,border-color .12s}.tab-bar .tab:hover{color:var(--fg)}.tab-bar .tab.active{color:var(--fg);border-bottom-color:var(--accent)}.preview-shell{position:relative;border-radius:0;overflow:hidden}.preview-iframe,.preview-shell{background:white;border:0;width:100%;height:100%;min-height:200px}.preview-iframe{display:block}.preview-error{position:absolute;top:0;left:0;right:0;padding:8px 12px;background:var(--danger);color:white;font-family:Fira Code,Menlo,monospace;font-size:12px;white-space:pre-wrap;word-break:break-word}.preview-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px}.game-shell{height:100vh;display:flex;flex-direction:column;padding:8px;gap:8px;background:var(--bg);box-sizing:border-box}.game-topbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;background:var(--bg-2);border:1px solid var(--border);border-radius:10px;padding:8px 14px;grid-gap:16px;gap:16px;flex:0 0 auto}.topbar-left{display:flex;align-items:center;gap:10px;min-width:0;flex-wrap:wrap}.topbar-center{display:flex;gap:8px;justify-content:center}.topbar-right{display:flex;align-items:center;gap:10px;justify-content:flex-end;flex-wrap:wrap}.brand{font-weight:700;font-size:14px;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:.2px}.divider{width:1px;height:18px;background:var(--border)}.topbar-run,.topbar-submit{padding:7px 18px;border-radius:6px;font-weight:600;font-size:13px}.topbar-run{background:rgba(25,195,125,.12);color:var(--accent-2);border:1px solid var(--accent-2)}.topbar-run:hover:not(:disabled),.topbar-submit{background:var(--accent-2);color:white}.topbar-submit:hover:not(:disabled){background:#14a368}.game-grid{flex:1 1;grid-template-columns:minmax(360px,1fr) minmax(0,1fr);grid-gap:8px}.game-grid,.game-right{display:grid;gap:8px;min-height:0}.game-right{grid-template-rows:minmax(0,1.2fr) minmax(0,1fr);grid-gap:8px;min-width:0}.panel{background:var(--bg-2);border:1px solid var(--border);border-radius:10px;display:flex;flex-direction:column;min-height:0;min-width:0;overflow:hidden}.panel-header{display:flex;align-items:center;gap:4px;border-bottom:1px solid var(--border);padding:4px 8px;background:var(--bg);min-height:38px;flex:0 0 auto}.panel-title{font-weight:600;padding:0 10px;font-size:13px}.panel-body{flex:1 1;min-height:0;display:flex}.panel-body.scroll{overflow:auto;display:block}.panel-body.padded{padding:16px}.panel-body.editor-fill,.panel-body.preview-fill{padding:0;position:relative}.panel-body.editor-fill>.editor-shell,.panel-body.preview-fill>.preview-shell{flex:1 1}.tab{background:transparent;color:var(--muted);padding:8px 14px;border:0;border-radius:0;border-bottom:2px solid transparent;font-size:13px;cursor:pointer;transition:color .12s,border-color .12s;margin-bottom:-5px}.tab.active,.tab:hover{color:var(--fg)}.tab.active{border-bottom-color:var(--accent-2)}.problem-title{font-size:20px;font-weight:600;margin:0 0 12px;letter-spacing:-.2px}.badge.difficulty{background:rgba(25,195,125,.12);border-color:var(--accent-2);color:var(--accent-2)}.test-list-row{display:flex;gap:12px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);font-size:13px;align-items:flex-start}@media (max-width:900px){.game-shell{height:auto;min-height:100vh}.game-grid{grid-template-columns:1fr}.game-right{grid-template-rows:360px 320px}.game-topbar{grid-template-columns:1fr;grid-template-rows:auto auto auto}.topbar-center,.topbar-right{justify-content:flex-start}}.problem-desc li code,.problem-desc p code{background:var(--bg);padding:1px 6px;border-radius:4px;border:1px solid var(--border);font-size:13px}.card{background:var(--bg-2);border:1px solid var(--border);border-radius:14px;padding:24px}.row{align-items:center}.col,.row{display:flex;gap:12px}.col{flex-direction:column}.spacer{flex:1 1}.muted{color:var(--muted)}.badge{display:inline-block;padding:2px 8px;border-radius:999px;background:var(--bg);border:1px solid var(--border);font-size:12px}.badge.online{color:var(--accent-2);border-color:var(--accent-2)}.badge.offline{color:var(--muted)}.badge.ready{color:var(--accent-2);border-color:var(--accent-2)}.title{font-size:28px;font-weight:700;margin:0 0 8px}.subtitle{color:var(--muted);margin:0 0 24px}.editor-shell{width:100%;height:100%;border:0;border-radius:0;overflow:hidden;background:#1e1e1e}.editor-shell.with-color-stripe{border-left:3px solid var(--accent)}.editor-shell .monaco-editor{border-radius:0}.editor-loading{height:100%;min-height:200px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-family:Fira Code,Menlo,Consolas,monospace}.timer{font-family:Fira Code,Menlo,monospace;font-size:22px;font-weight:700}.timer.warn{color:var(--warn)}.timer.danger{color:var(--danger)}.test{display:flex;align-items:flex-start;gap:8px;padding:8px 10px;border:1px solid var(--border);border-radius:8px;background:var(--bg);font-family:Fira Code,Menlo,monospace;font-size:13px;white-space:pre-wrap;word-break:break-word}.test.pass{border-color:var(--accent-2)}.test.fail{border-color:var(--danger)}.scoreboard{width:100%;border-collapse:collapse}.scoreboard td,.scoreboard th{padding:10px;border-bottom:1px solid var(--border);text-align:left}.scoreboard th{color:var(--muted);font-weight:500;font-size:13px}.scoreboard tr.me td{background:rgba(124,92,255,.1)}