/* Hand Racing — 全域樣式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #0a0d12; color: #e8edf4;
  font-family: "Segoe UI", "Microsoft JhengHei", system-ui, sans-serif; user-select: none; }

#game { position: fixed; inset: 0; width: 100%; height: 100%; display: block; }
#ui { position: fixed; inset: 0; pointer-events: none; }
#ui > * { pointer-events: auto; }

/* ── 開機畫面 ─────────────────────────────── */
#boot { position: fixed; inset: 0; background: radial-gradient(ellipse at 50% 40%, #131a26 0%, #0a0d12 70%);
  display: flex; align-items: center; justify-content: center; z-index: 100; transition: opacity .4s; }
#boot.hide { opacity: 0; pointer-events: none; }
.boot-inner { text-align: center; }
.boot-logo { font-size: 44px; font-weight: 800; letter-spacing: 2px;
  background: linear-gradient(135deg, #ff5a3c, #ffb03c); -webkit-background-clip: text; background-clip: text; color: transparent; }
.boot-status { margin-top: 18px; font-size: 16px; color: #9fb0c8; }
.boot-detail { margin-top: 8px; font-size: 12px; color: #5a6a80; white-space: pre-line; }

/* ── 通用面板(選單/結算)──────────────────── */
.panel { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  background: rgba(13, 18, 27, .92); border: 1px solid #2a3548; border-radius: 14px;
  padding: 28px 34px; min-width: 380px; backdrop-filter: blur(6px); }
.panel h1 { font-size: 30px; margin-bottom: 6px;
  background: linear-gradient(135deg, #ff5a3c, #ffb03c); -webkit-background-clip: text; background-clip: text; color: transparent; }
.panel h2 { font-size: 20px; margin-bottom: 14px; color: #cfd9e8; }
.panel .sub { color: #8fa0b8; font-size: 13px; margin-bottom: 18px; }
.menu-btn { display: block; width: 100%; margin: 8px 0; padding: 12px 18px; font-size: 16px; font-weight: 600;
  color: #e8edf4; background: #1a2334; border: 1px solid #31405a; border-radius: 9px; cursor: pointer; text-align: left; }
.menu-btn:hover { background: #223049; border-color: #4a6285; }
.menu-btn.primary { background: linear-gradient(135deg, #b13a24, #cf7a1f); border-color: #e08a4a; }
.menu-btn.primary:hover { filter: brightness(1.15); }
.menu-btn:disabled { opacity: .45; cursor: default; }
.row { display: flex; align-items: center; gap: 10px; margin: 10px 0; font-size: 14px; }
.row label { flex: 1; color: #aebdd2; }
.row input[type=range] { flex: 1.2; }
.row select { background: #1a2334; color: #e8edf4; border: 1px solid #31405a; border-radius: 6px; padding: 4px 8px; max-width: 200px; }
.row .val { width: 44px; text-align: right; color: #cfd9e8; font-variant-numeric: tabular-nums; }
.kbd { display: inline-block; padding: 1px 7px; border: 1px solid #46536b; border-bottom-width: 2px; border-radius: 5px;
  background: #1c2434; font-size: 12px; font-family: Consolas, monospace; }

/* ── HUD ─────────────────────────────────── */
#hud { position: absolute; inset: 0; display: none; }
#hud.on { display: block; }
.hud-card { background: rgba(11, 16, 24, .62); border: 1px solid rgba(80, 100, 132, .35);
  border-radius: 12px; padding: 10px 14px; backdrop-filter: blur(4px); }
.hud-tl { position: absolute; top: 16px; left: 18px; font-variant-numeric: tabular-nums; min-width: 168px; }
.hud-lap { font-size: 21px; font-weight: 800; letter-spacing: .5px; }
.hud-time { font-size: 13px; color: #aebdd2; margin-top: 4px; white-space: pre-line; line-height: 1.55; }
.hud-delta { font-size: 15px; font-weight: 800; margin-top: 3px; opacity: 0; transition: opacity .3s; }
.hud-delta.on { opacity: 1; }
.hud-delta.good { color: #43c96b; }
.hud-delta.bad { color: #ff6a4a; }
.hud-pos { position: absolute; top: 16px; right: 18px; text-align: right; }
.hud-pos .p { font-size: 32px; font-weight: 800; color: #ffb03c; }
.hud-pos .of { font-size: 14px; color: #8fa0b8; }
#speedDial { position: absolute; right: 18px; bottom: 14px; filter: drop-shadow(0 2px 8px rgba(0,0,0,.45)); }
.hud-chip { position: absolute; bottom: 186px; left: 18px; padding: 5px 13px; border-radius: 999px;
  font-size: 13px; font-weight: 700; opacity: 0; transition: opacity .25s, background .2s;
  background: rgba(11,16,24,.7); border: 1px solid rgba(80,100,132,.4); }
.hud-chip.on { opacity: 1; }
.hud-chip.good { color: #7fe8a2; border-color: rgba(67,201,107,.5); }
.hud-chip.brake { color: #ffd23c; border-color: rgba(255,176,60,.65); background: rgba(64,32,10,.75); }
.hud-chip.warn { color: #ff8a70; border-color: rgba(255,90,60,.55); }
.hud-msg { position: absolute; top: 22%; left: 50%; transform: translateX(-50%); font-size: 30px; font-weight: 800;
  color: #ff6a4a; text-shadow: 0 2px 12px rgba(0,0,0,.6); display: none; }
.hud-msg.on { display: block; }
.hud-center { position: absolute; top: 15%; left: 50%; transform: translateX(-50%) scale(.6); font-size: 68px; font-weight: 900;
  color: #43e07a; text-shadow: 0 3px 18px rgba(0,0,0,.7), 0 0 32px rgba(67,224,122,.5);
  opacity: 0; transition: transform .18s ease-out, opacity .18s; }
.hud-center.on { opacity: 1; transform: translateX(-50%) scale(1); }
.hud-center.alert { font-size: 34px; color: #ff8a70;
  text-shadow: 0 3px 14px rgba(0,0,0,.7), 0 0 24px rgba(255,90,60,.45); }
/* F1 起跑燈 */
#startLights { position: absolute; top: 11%; left: 50%; transform: translateX(-50%);
  display: flex; gap: 18px; padding: 14px 22px; border-radius: 16px;
  background: rgba(8, 11, 16, .78); border: 1px solid #2a3548; opacity: 0; transition: opacity .25s; }
#startLights.show { opacity: 1; }
#startLights i { width: 34px; height: 34px; border-radius: 50%; background: #232b38;
  box-shadow: inset 0 2px 5px rgba(0,0,0,.6); transition: background .12s, box-shadow .12s; }
#startLights i.red { background: radial-gradient(circle at 35% 30%, #ff8a70, #d92b16);
  box-shadow: 0 0 18px rgba(255,70,40,.8); }
#startLights i.green { background: radial-gradient(circle at 35% 30%, #8ff0ae, #1fae52);
  box-shadow: 0 0 18px rgba(50,220,110,.85); }

/* 方向盤弧形指示 */
#steerArc { position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%); }

/* 攝像頭小窗 */
#camBox { position: absolute; bottom: 18px; left: 18px; width: 208px; border-radius: 10px; overflow: hidden;
  border: 1px solid #31405a; background: #000; }
#camBox.hidden { display: none; }
#camBox.braking { border-color: #ffb03c; box-shadow: 0 0 14px rgba(255,176,60,.55); }
#camBox video, #camBox canvas { display: block; width: 100%; transform: scaleX(-1); } /* 只在顯示層鏡像 */
#camBox canvas { position: absolute; inset: 0; }
#camStatus { position: absolute; left: 0; right: 0; bottom: 0; font-size: 11px; padding: 3px 8px;
  background: rgba(0,0,0,.55); color: #cfd9e8; }
#camStatus.bad { color: #ff8a70; font-weight: 700; }

/* 迷你地圖 */
#miniMap { position: absolute; top: 70px; right: 18px; opacity: .92; }

/* 結算 */
#resultPanel { min-width: 460px; }
#resultPanel .r-row { display: flex; align-items: center; gap: 12px; padding: 9px 14px; margin: 6px 0;
  border-radius: 10px; background: rgba(26, 35, 52, .55); border: 1px solid transparent;
  font-variant-numeric: tabular-nums; }
#resultPanel .r-row.me { background: rgba(78, 46, 18, .6); border-color: rgba(255, 176, 60, .5); }
#resultPanel .r-pos { font-size: 22px; width: 40px; font-weight: 800; }
#resultPanel .r-who { flex: 1; font-weight: 700; }
#resultPanel .r-t { color: #cfd9e8; }
#resultPanel .r-best { color: #8fa0b8; font-size: 13px; width: 92px; text-align: right; }
#resultPanel .r-laps { color: #6b7d95; font-size: 12px; margin: 4px 0 14px; }

/* 校準畫面 */
#calib { text-align: center; }
#calib .cam-wrap { position: relative; width: 480px; margin: 10px auto; border-radius: 12px; overflow: hidden; border: 1px solid #31405a; }
#calib video, #calib canvas { display: block; width: 100%; transform: scaleX(-1); }
#calib canvas { position: absolute; inset: 0; }
#calibMsg { font-size: 16px; color: #ffd23c; min-height: 24px; margin-top: 8px; }