:root {
  color-scheme: dark;
  --bg: #071019;
  --panel: #0d1b27;
  --line: #1e3b4a;
  --text: #e8f6f5;
  --muted: #8da8ad;
  --cyan: #41e1db;
  --pink: #ff4da4;
  --gold: #ffd66b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at 50% -20%, #143149, var(--bg) 60%);
  color: var(--text);
  font: 15px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.shell { width: min(1120px, calc(100% - 28px)); margin: 0 auto; padding: 34px 0 48px; }
.hero { border-bottom: 1px solid var(--line); padding-bottom: 20px; }
.eyebrow, .label, .panel-title, .status { color: var(--cyan); letter-spacing: .14em; font-weight: 800; font-size: 12px; }
h1 { margin: 5px 0 0; font-size: clamp(34px, 7vw, 72px); letter-spacing: .08em; line-height: 1; }
.lede { color: var(--muted); margin: 10px 0 0; }
.toolbar, .scoreboard { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin: 18px 0; }
.toolbar label { color: var(--muted); }
input, button { border: 1px solid var(--line); border-radius: 6px; background: #0a1722; color: var(--text); padding: 9px 12px; font: inherit; }
button { cursor: pointer; border-color: #28747b; }
button:hover { background: #12303b; }
.status { margin-left: auto; color: var(--gold); }
.scoreboard { justify-content: space-between; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 14px 18px; }
.scoreboard div { display: grid; gap: 3px; min-width: 120px; }
.scoreboard strong { font-size: 32px; }
.scoreboard .right { text-align: right; }
.blue { color: var(--cyan); } .red { color: var(--pink); }
.match-meta { color: var(--gold); display: flex !important; gap: 16px; text-align: center; }
#arena { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 8px; background: #091722; }
.lower { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px; min-height: 170px; }
.panel-title { display: flex; justify-content: space-between; border-bottom: 1px solid var(--line); padding-bottom: 10px; }
.panel-title b { color: var(--gold); }
.muted { color: var(--muted); font-size: 13px; }
pre { margin: 14px 0 0; padding: 10px; overflow: auto; color: #b9d3d2; background: #07131c; border-radius: 5px; font-size: 12px; }
.events { margin: 12px 0 0; padding-left: 24px; max-height: 160px; overflow: auto; color: var(--muted); font-size: 12px; }
.events li { margin-bottom: 5px; }
@media (max-width: 700px) { .lower { grid-template-columns: 1fr; } .status { margin-left: 0; } .match-meta { order: 3; width: 100%; justify-content: center; } }

.coding-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 12px; margin-top: 12px; align-items: start; }
.editor-panel, .arena-panel { min-height: 0; }
.editor-tools, .actions, .replay-controls { display: flex; align-items: end; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.editor-tools label, .replay-controls label { display: grid; gap: 4px; color: var(--muted); font-size: 12px; }
.editor-tools input, .editor-tools select, .replay-controls select { padding: 7px 9px; }
#code { width: 100%; min-height: 270px; resize: vertical; padding: 12px; border: 1px solid var(--line); border-radius: 6px; background: #061018; color: var(--text); font: 13px/1.55 ui-monospace, monospace; }
.diagnostics { margin-top: 8px; display: grid; gap: 5px; }
.diagnostic { padding: 7px 9px; border-radius: 5px; background: #211d16; color: var(--gold); font-size: 12px; }
.diagnostic.error { background: #321b2a; color: #ff9bc9; }
.diagnostic.success { background: #103539; color: var(--cyan); }
.good { color: var(--cyan) !important; }.bad { color: var(--pink) !important; }
.api-help { margin-top: 10px; color: var(--muted); font-size: 12px; }.api-help code { color: var(--cyan); }
.replay-controls { align-items: center; margin-bottom: 0; }
.replay-controls label { display: flex; align-items: center; gap: 6px; }
.arena-panel #arena { width: 100%; max-width: 900px; height: auto; aspect-ratio: 900 / 520; }
.lower { margin-top: 12px; }
@media (max-width: 840px) { .coding-layout { grid-template-columns: 1fr; } #code { min-height: 220px; } }