:root {
  --bg: #07101c;
  --bg-elev: rgba(10, 22, 40, 0.82);
  --line: rgba(140, 206, 255, 0.18);
  --cyan: #3ee0ff;
  --blue: #2f8cff;
  --orange: #ffb020;
  --gold: #ffd15c;
  --text: #e8f4ff;
  --muted: #93a8c4;
  --danger: #ff5d73;
  --ok: #3ee0a0;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.38);
  --radius: 22px;
  --font: "Segoe UI", Bahnschrift, "Trebuchet MS", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

body {
  min-height: 100dvh;
  overflow: hidden;
}

button, input, select { font: inherit; }

[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.bg-glow {
  position: fixed;
  inset: -10%;
  pointer-events: none;
  background:
    radial-gradient(circle at 15% 10%, rgba(47, 140, 255, 0.18), transparent 32%),
    radial-gradient(circle at 85% 0%, rgba(62, 224, 255, 0.12), transparent 28%),
    radial-gradient(circle at 70% 90%, rgba(255, 176, 32, 0.08), transparent 26%);
  animation: drift 18s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(0, -16px, 0); }
}

.app {
  height: 100dvh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas:
    "hud hud"
    "stage dock";
}

.hud {
  grid-area: hud;
  display: flex;
  align-items: center;
  gap: 0.45rem 0.55rem;
  padding: 0.55rem 0.75rem;
  flex-wrap: wrap;
  background: linear-gradient(180deg, rgba(7, 16, 28, 0.92), rgba(7, 16, 28, 0.72));
  border-bottom: 1px solid var(--line);
  z-index: 2;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cyan);
}

.logo-mark {
  width: 28px;
  height: 28px;
  color: var(--cyan);
}

.logo-mark-lg {
  width: 72px;
  height: 72px;
  filter: drop-shadow(0 0 16px rgba(62, 224, 255, 0.45));
}

.hud-stat {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin: 0;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  background: rgba(8, 20, 36, 0.76);
  border: 1px solid var(--line);
}

.hud-label, .unit {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hud-stat strong {
  font-variant-numeric: tabular-nums;
  font-size: 0.98rem;
}

.hud-boost {
  color: #2a1600;
  background: linear-gradient(180deg, #ffe08a, #ff9a1f);
  border-color: transparent;
  font-weight: 800;
}

.lives {
  display: inline-flex;
  gap: 0.22rem;
}

.lives i {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(62, 224, 255, 0.7);
}

.lives i.is-spent {
  background: #35506a;
  box-shadow: none;
}

.btn-pause { margin-left: auto; }

.stage {
  grid-area: stage;
  position: relative;
  min-width: 0;
  min-height: 0;
  outline: none;
}

#game-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #07101c;
}

.dock {
  grid-area: dock;
  min-height: 0;
  overflow: auto;
  padding: 0.75rem;
  background: rgba(6, 14, 26, 0.92);
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.preview-panel, .debug, .dock-controls {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(12, 28, 48, 0.55);
  padding: 0.7rem;
}

.preview-panel summary, .debug summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--cyan);
}

.preview-frame {
  position: relative;
  margin-top: 0.6rem;
  border-radius: 12px;
  overflow: hidden;
  background: #050910;
  border: 1px solid var(--line);
}

.webcam-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
}

#preview-canvas {
  display: block;
  width: 100%;
  height: auto;
  background: #050910;
}

.preview-note, .hint, .note, .tagline {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.4;
}

.tracking-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.55rem 0 0;
  font-weight: 650;
}

.tracking-dot {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--danger);
  box-shadow: 0 0 0 3px rgba(255, 93, 115, 0.15);
}

.tracking-dot[data-quality="stable"] {
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(62, 224, 160, 0.18);
}

.tracking-dot[data-quality="idle"] {
  background: #7f93ad;
  box-shadow: none;
}
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(255, 209, 92, 0.18);
}

.gauge {
  position: relative;
  height: 62px;
  margin-top: 0.35rem;
}

.gauge-scale {
  position: absolute;
  left: 18%;
  right: 18%;
  bottom: 8px;
  height: 36px;
  border: 2px solid rgba(62, 224, 255, 0.35);
  border-bottom: 0;
  border-radius: 40px 40px 0 0;
}

.gauge-needle {
  position: absolute;
  left: 50%;
  bottom: 8px;
  width: 4px;
  height: 42px;
  margin-left: -2px;
  border-radius: 4px;
  background: linear-gradient(#ffffff, var(--cyan));
  transform-origin: 50% 100%;
  box-shadow: 0 0 10px rgba(62, 224, 255, 0.55);
}

.steer-readout {
  margin: 0.15rem 0 0;
  text-align: center;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
}

.debug { margin-top: 0.55rem; padding: 0.45rem 0.55rem; }

.debug-list, .stats {
  display: grid;
  gap: 0.25rem;
  margin: 0.45rem 0 0;
}

.debug-list div, .stats div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.debug-list dt, .stats dt { color: var(--muted); }
.debug-list dd, .stats dd { margin: 0; font-variant-numeric: tabular-nums; font-weight: 700; }

.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem; }

.slider-label {
  display: flex;
  justify-content: space-between;
  margin: 0.7rem 0 0.3rem;
  color: var(--muted);
  font-size: 0.88rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--cyan);
}

.camera-picker {
  display: grid;
  gap: 0.35rem;
  margin: 0.75rem 0 0.2rem;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: left;
}

.camera-picker select {
  width: 100%;
  color: var(--text);
  background: #0c1a2e;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.65rem 0.7rem;
}

.row { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.7rem; }

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.72rem 1rem;
  font-weight: 750;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease, background 0.15s ease;
}

.btn:hover { transform: translateY(-1px); filter: brightness(1.06); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-primary {
  color: #04121f;
  background: linear-gradient(180deg, #67ecff, #1a8dff);
  box-shadow: 0 8px 24px rgba(40, 170, 255, 0.28);
}

.btn-accent {
  color: #2a1500;
  background: linear-gradient(180deg, #ffe08a, #ff9d1c);
  box-shadow: 0 8px 22px rgba(255, 160, 32, 0.22);
}

.btn-ghost { border-color: var(--line); }

.btn.is-active, .btn[aria-pressed="true"].is-active {
  border-color: transparent;
  color: #04121f;
  background: linear-gradient(180deg, #67ecff, #1a8dff);
}

.btn-block { width: 100%; margin-top: 0.8rem; }

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  overflow: auto;
  background: radial-gradient(ellipse at center, rgba(4, 10, 20, 0.2), rgba(4, 10, 20, 0.62));
  z-index: 3;
}

.overlay-clear { background: transparent; pointer-events: none; }

#overlay-setup[data-step="4"] { place-items: start center; }

.card {
  width: min(460px, 100%);
  padding: 1.2rem 1.2rem 1rem;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(16, 34, 58, 0.94), rgba(8, 16, 30, 0.9));
  border: 1px solid var(--line);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(16px);
}

.menu-card { text-align: center; }

h1, h2 { margin: 0.2rem 0; letter-spacing: -0.03em; }
h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h2 { font-size: 1.35rem; }

.kicker {
  margin: 0;
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.menu-best { font-size: 1rem; }
.menu-best strong { color: var(--gold); }

.menu-actions, .help { text-align: left; }
.menu-actions { display: grid; gap: 0.5rem; margin: 0.9rem 0; }

.help {
  border-top: 1px solid var(--line);
  padding-top: 0.7rem;
}

.help h2 { font-size: 0.95rem; color: var(--cyan); }
.help ul, .checklist { margin: 0.4rem 0 0; padding-left: 1.1rem; color: var(--muted); }
.help li, .checklist li { margin: 0.28rem 0; }

.checklist li.is-ok { color: var(--ok); }
.checklist li.is-bad { color: #ffb4c0; }

.error {
  color: #ffd0d6;
  background: rgba(255, 93, 115, 0.12);
  border: 1px solid rgba(255, 93, 115, 0.35);
  border-radius: 12px;
  padding: 0.6rem 0.7rem;
}

.progress {
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  margin-top: 0.7rem;
}

#calib-progress {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
}

.record {
  display: inline-block;
  margin: 0.4rem 0 0;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  color: #2a1500;
  background: var(--gold);
  font-weight: 800;
}

.stats { margin-top: 0.8rem; }

.countdown-label {
  margin: 0;
  font-size: clamp(5rem, 16vw, 9rem);
  font-weight: 900;
  letter-spacing: -0.06em;
  color: white;
  text-shadow: 0 0 30px rgba(62, 224, 255, 0.55);
}

.countdown-label.is-go { color: var(--gold); }

.banner, .toast {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  margin: 0;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  font-weight: 800;
}

.banner {
  top: 0.8rem;
  color: #fff;
  background: rgba(180, 30, 50, 0.88);
}

.toast {
  bottom: 1rem;
  max-width: min(520px, calc(100% - 1.5rem));
  background: rgba(8, 18, 32, 0.92);
  border: 1px solid var(--line);
}

.touch-controls {
  display: none;
  position: absolute;
  left: 0.6rem;
  right: 0.6rem;
  bottom: 0.6rem;
  z-index: 4;
  gap: 0.45rem;
}

.touch-controls .btn {
  flex: 1;
  min-height: 48px;
  touch-action: none;
}

.touch-controls .btn.is-held {
  color: #04121f;
  background: var(--cyan);
}

.noscript {
  padding: 1rem;
}

@media (max-width: 820px) {
  body { overflow: auto; }
  .app {
    height: auto;
    min-height: 100dvh;
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(52dvh, 1fr) auto;
    grid-template-areas:
      "hud"
      "stage"
      "dock";
  }
  .stage { min-height: 52dvh; }
  .dock {
    border-left: 0;
    border-top: 1px solid var(--line);
    max-height: none;
  }
  .preview-frame { max-height: 180px; }
  #preview-canvas { max-height: 180px; object-fit: cover; }
}

@media (pointer: coarse), (max-width: 720px) {
  body[data-state="PLAYING"] .touch-controls,
  body[data-state="COUNTDOWN"] .touch-controls { display: flex; }
  .btn { min-height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}