:root {
  --bg: #f6f4ef;
  --panel: #ffffff;
  --text: #1d1d1f;
  --muted: #6b6b70;
  --border: #e2ded5;
  --accent: #1f6feb;
  --sq-light: #ecdcbf;
  --sq-dark: #a77c56;
  --sq-last: rgba(255, 214, 0, 0.55);
  --sq-check: #e5484d;
  --arrow: rgba(31, 111, 235, 0.55);
  --piece-white: #ffffff;
  --piece-black: #1b1b1b;
  --piece-outline: #1b1b1b;
  --ok: #1a7f37;
  --warn: #b35900;
  --bad: #c62828;
  --bubble-user: #1f6feb;
  --bubble-user-text: #ffffff;
  --bubble-bot: #efece6;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141416;
    --panel: #1d1d20;
    --text: #ececef;
    --muted: #9a9aa2;
    --border: #2e2e33;
    --sq-light: #c9b48f;
    --sq-dark: #7d5a3c;
    --bubble-bot: #2a2a2f;
  }
}
:root[data-theme="dark"] {
  --bg: #141416; --panel: #1d1d20; --text: #ececef; --muted: #9a9aa2; --border: #2e2e33;
  --sq-light: #c9b48f; --sq-dark: #7d5a3c; --bubble-bot: #2a2a2f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1 { font-size: 18px; margin: 0; }
button, input { font: inherit; }

/* Board */
.board { width: 100%; height: auto; display: block; user-select: none; }
.board .sq.light { fill: var(--sq-light); }
.board .sq.dark { fill: var(--sq-dark); }
.board .sq.last { fill: var(--sq-last); }
.board .sq.dark.last { fill: color-mix(in srgb, var(--sq-last) 70%, var(--sq-dark)); }
.board .sq.check { fill: var(--sq-check); }
.board .coord { font-size: 0.26px; fill: var(--muted); }
.board .arrow { stroke: var(--arrow); stroke-width: 0.12; stroke-linecap: round; }
.board .piece { font-size: 0.82px; font-family: "Segoe UI Symbol", "Noto Sans Symbols 2", "Apple Symbols", serif; }
.board .piece.white { fill: var(--piece-white); stroke: var(--piece-outline); stroke-width: 0.025; paint-order: stroke; }
.board .piece.black { fill: var(--piece-black); stroke: #ffffff; stroke-width: 0.012; paint-order: stroke; }
.board .piece-wrap { transition: transform 220ms ease-out; }
@media (prefers-reduced-motion: reduce) { .board .piece-wrap { transition: none; } }

/* Layout */
.app { max-width: 1200px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
@media (max-width: 860px) { .app { grid-template-columns: 1fr; } }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px; min-width: 0; }
header.top { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--panel); }
header.top .spacer { flex: 1; }
.muted { color: var(--muted); }
.pill { display: inline-block; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); font-size: 13px; }
.code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.05em; }

.info { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; align-items: center; }
.moves { margin-top: 12px; font-family: ui-monospace, Menlo, monospace; font-size: 13px; color: var(--muted); max-height: 96px; overflow: auto; }

/* Transcript */
.transcript { height: 52vh; min-height: 280px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; padding-right: 4px; }
.msg { max-width: 88%; padding: 8px 12px; border-radius: 12px; overflow-wrap: anywhere; }
.msg.user { align-self: flex-end; background: var(--bubble-user); color: var(--bubble-user-text); }
.msg.bot { align-self: flex-start; background: var(--bubble-bot); }
.msg details { margin-top: 6px; font-size: 12px; }
.msg pre { margin: 6px 0 0; white-space: pre-wrap; font-size: 11.5px; max-height: 220px; overflow: auto; }
.lat { font-size: 12px; font-weight: 600; margin-left: 6px; }
.lat.ok { color: var(--ok); } .lat.warn { color: var(--warn); } .lat.bad { color: var(--bad); }
.tool { font-family: ui-monospace, Menlo, monospace; font-size: 12px; opacity: 0.8; }

.composer { display: flex; gap: 8px; margin-top: 12px; }
.composer input { flex: 1; min-width: 0; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); }
.btn { padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.mic.listening { background: var(--bad); color: #fff; border-color: var(--bad); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chip { padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border); background: transparent; color: var(--text); cursor: pointer; font-size: 13px; }
.chip:hover, .btn:hover { border-color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* Watch (spectator / TV) */
.watch { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.watch .wrap { width: min(92vmin, 900px); }
.watch .speech { font-size: clamp(16px, 2.6vmin, 28px); text-align: center; margin-top: 12px; min-height: 2.6em; }
.join { display: flex; gap: 8px; justify-content: center; margin-top: 16px; }