* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background:
    radial-gradient(circle at 20% 15%, rgba(0, 240, 255, 0.12), transparent 45%),
    radial-gradient(circle at 80% 85%, rgba(224, 64, 251, 0.12), transparent 45%),
    #05060f fixed;
  color: #fff;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  touch-action: pan-y;
  user-select: none;
}

#game-container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── HUD ── */
#hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: linear-gradient(180deg, rgba(20, 28, 60, 0.9), rgba(8, 10, 28, 0.9));
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-bottom: 0;
  border-radius: 12px 12px 0 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 2px;
  width: min(600px, 100vw, max(200px, calc(100vh - var(--gp-header-h, 80px) - 58px)));
  width: min(600px, 100vw, max(200px, calc(100dvh - var(--gp-header-h, 80px) - 58px)));
}

.score-cyan { color: #00f0ff; text-shadow: 0 0 10px rgba(0, 240, 255, 0.7); }
.score-magenta { color: #e040fb; text-shadow: 0 0 10px rgba(224, 64, 251, 0.7); }
#round-info { color: #666; font-size: 14px; }

canvas {
  display: block;
  width: min(600px, 100vw, max(200px, calc(100vh - var(--gp-header-h, 80px) - 58px)));
  width: min(600px, 100vw, max(200px, calc(100dvh - var(--gp-header-h, 80px) - 58px)));
  height: auto;
  border-radius: 0 0 12px 12px;
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-top: none;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 50px rgba(0, 240, 255, 0.1);
  touch-action: none;
}

/* ── Overlays ── */
#overlay, #round-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  justify-content: safe center;
  align-items: center;
  overflow-y: auto;
  background: rgba(5, 6, 18, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-radius: 12px;
  z-index: 10;
}

#overlay.hidden, #round-overlay.hidden { display: none; }

#overlay h1 {
  font-size: 72px;
  letter-spacing: 20px;
  background: linear-gradient(90deg, #00f0ff, #e040fb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 14px rgba(0, 240, 255, 0.45)) drop-shadow(0 0 22px rgba(224, 64, 251, 0.35));
  margin-bottom: 8px;
}

.tagline {
  color: #666;
  font-size: 16px;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

#controls-info {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 24px;
}

.player-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  color: #aaa;
  letter-spacing: 2px;
}

.label-cyan { color: #00f0ff; font-weight: 700; font-size: 14px; letter-spacing: 3px; }
.label-magenta { color: #e040fb; font-weight: 700; font-size: 14px; letter-spacing: 3px; }

.vs {
  color: #444;
  font-size: 20px;
  font-weight: 700;
  text-transform: uppercase;
}

.btn {
  padding: 14px 44px;
  font-size: 18px;
  font-weight: 700;
  border: 2px solid;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.2s;
  background: transparent;
  position: relative;
  z-index: 20;
  pointer-events: auto;
}

.btn-cyan {
  color: #00f0ff;
  border-color: #00f0ff;
}
.btn-cyan:hover {
  background: rgba(0, 240, 255, 0.15);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

.instructions {
  margin-top: 24px;
  color: #444;
  font-size: 13px;
  letter-spacing: 2px;
}

#mode-picker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.mode-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.mode-row[hidden] { display: none; }

.mode-chip {
  min-height: 36px;
  padding: 7px 16px;
  border: 1px solid #333;
  border-radius: 999px;
  background: transparent;
  color: #888;
  font: 700 13px 'Segoe UI', sans-serif;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.mode-chip:hover { color: #ccc; border-color: #555; }

.mode-chip.selected {
  color: #00f0ff;
  border-color: #00f0ff;
  background: rgba(0, 240, 255, 0.1);
}

#level-row .mode-chip.selected {
  color: #e040fb;
  border-color: #e040fb;
  background: rgba(224, 64, 251, 0.1);
}

.how-to {
  max-width: 340px;
  margin: 0 0 20px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  text-align: left;
  font-size: 13px;
  line-height: 1.7;
  color: #aaa;
}

.how-to-title {
  margin-bottom: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #666;
}

#round-overlay h2 {
  font-size: 42px;
  margin-bottom: 10px;
}

#round-overlay p {
  color: #888;
  font-size: 18px;
}

.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 640px) {
  #overlay h1 { font-size: 48px; letter-spacing: 12px; }
  #hud { font-size: 14px; padding: 8px 12px; }
  canvas { max-width: 100vw; height: auto; }
  .btn { padding: 12px 32px; font-size: 16px; }
  #controls-info { gap: 16px; }
  .player-controls { font-size: 13px; }
}

@media (max-width: 640px), (max-height: 760px) {
  #overlay h1 { font-size: 40px; letter-spacing: 10px; }
  .tagline { margin-bottom: 16px; }
  #controls-info { margin-bottom: 16px; }
  #mode-picker { margin-bottom: 16px; gap: 6px; }
  .how-to { margin-bottom: 14px; padding: 10px 14px; line-height: 1.55; }
  .instructions { margin-top: 12px; }
}

@media (max-width: 500px), (max-height: 500px) {
  #overlay { position: fixed; top: var(--gp-header-h, 48px); right: 0; bottom: 0; left: 0; z-index: 900; border-radius: 0; width: auto; height: auto; }
}

@media (orientation: landscape) and (max-height: 500px) {
  #overlay:not(.hidden) { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 24px; align-items: center; align-content: center; justify-items: center; width: auto; padding-left: max(12px, calc((100% - 780px) / 2)); padding-right: max(12px, calc((100% - 780px) / 2)); }
  #overlay:not(.hidden) > * { grid-column: 2; }
  #overlay:not(.hidden) > div:not([id]) { grid-column: 1; grid-row: 1 / span 6; margin: 0; max-width: 340px; width: 100%; }
  #overlay h1 { font-size: 36px; letter-spacing: 8px; }
  .tagline, #controls-info, #mode-picker { margin-bottom: 10px; }
  .instructions { display: none; }
  #hud { padding: 8px 12px; font-size: 14px; letter-spacing: 1px; white-space: nowrap; }
}

@media (pointer: coarse) and (min-width: 700px) and (min-height: 700px) {
  #hud, canvas {
    width: min(760px, 100vw, max(200px, calc(100vh - var(--gp-header-h, 80px) - 58px)));
    width: min(760px, 100vw, max(200px, calc(100dvh - var(--gp-header-h, 80px) - 58px)));
  }
}

[data-theme="light"] html,
[data-theme="light"] body { background: var(--gp-page-grad) fixed; color: var(--gp-ink); }
[data-theme="light"] #hud { background: var(--gp-surface); color: var(--gp-ink); box-shadow: inset 0 0 0 1px var(--gp-line), var(--gp-shadow); }
[data-theme="light"] .score-cyan, [data-theme="light"] .label-cyan, [data-theme="light"] .btn-cyan, [data-theme="light"] .mode-chip.selected { color: #0a84b8; }
[data-theme="light"] #overlay, [data-theme="light"] #round-overlay { background: var(--gp-overlay); color: var(--gp-ink); }
[data-theme="light"] .player-controls, [data-theme="light"] #round-overlay p { color: var(--gp-ink-2); }
[data-theme="light"] .mode-chip { color: var(--gp-ink-2); }
[data-theme="light"] .mode-chip:hover { color: var(--gp-ink); }
[data-theme="light"] .how-to { background: rgba(31, 27, 69, 0.05); border-color: var(--gp-line); color: var(--gp-ink-2); }
[data-theme="light"] #overlay h1 { background: linear-gradient(90deg, #0891b2, #c026d3); -webkit-background-clip: text; background-clip: text; }
[data-theme="light"] #round-title { filter: brightness(0.72) saturate(1.3); }

.btn { border-radius: 999px; font-weight: 800; }
.btn-cyan { color: #b9fbff; border-color: #00f0ff; background: rgba(0, 240, 255, 0.08); box-shadow: 0 0 18px rgba(0, 240, 255, 0.35), inset 0 0 12px rgba(0, 240, 255, 0.2); text-shadow: 0 0 8px rgba(0, 240, 255, 0.8); }
.btn-ghost { color: #c8cbe0; border-color: rgba(255, 255, 255, 0.25); background: rgba(255, 255, 255, 0.05); }
.btn-ghost:hover { color: #fff; background: rgba(255, 255, 255, 0.1); }
#match-end-btns { display: flex; gap: 12px; margin-top: 16px; justify-content: center; }
#match-end-btns .btn { padding: 10px 28px; font-size: 15px; }
#latency-display { font-size: 12px; color: #888; margin-left: 8px; }
#latency-display.lat-good { color: #00e676; }
#latency-display.lat-ok { color: #ffd700; }
#latency-display.lat-bad { color: #ff4d6d; }
[data-theme="light"] .btn-cyan { color: #0a6e8a; text-shadow: none; background: rgba(8, 145, 178, 0.08); }
[data-theme="light"] .btn-ghost { color: var(--gp-ink-2); background: var(--gp-surface); border-color: var(--gp-line); }
.gp-btn-music.off { opacity: .4; }