:root {
  --bg: #000000;
  --panel: rgba(10,10,10,0.85);
  --panel-strong: rgba(5,5,5,0.95);
  --white: #ffffff;
  --text: #e8e8e8;
  --muted: #888888;
  --line: rgba(255,255,255,0.12);
  --line-strong: rgba(255,255,255,0.25);
  --shadow-white: 0 0 20px rgba(255,255,255,0.15);
  font-family: "SF Mono", "Cascadia Code", "Consolas", "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  touch-action: none;
  user-select: none;
}

button {
  font: inherit;
  color: inherit;
}

.app {
  position: relative;
  width: 100vw;
  height: 100dvh;
  min-height: 500px;
  overflow: hidden;
  background: var(--bg);
}

#gameCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

.hud {
  position: absolute;
  top: max(8px, env(safe-area-inset-top));
  left: max(8px, env(safe-area-inset-left));
  right: max(8px, env(safe-area-inset-right));
  z-index: 5;
  display: none;
  align-items: flex-start;
  justify-content: space-between;
  gap: 6px;
  pointer-events: none;
}

.state-playing .hud,
.state-paused .hud,
.state-gameOver .hud {
  display: flex;
}

.hud-left,
.hud-right {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

.hud-right {
  margin-left: auto;
}

.hud-pill,
.player-chip {
  min-height: 28px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
}

.hud-pill span {
  color: var(--muted);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hud-pill strong {
  min-width: 20px;
  text-align: right;
  color: var(--text);
  font-weight: 500;
}

.player-chip {
  color: var(--muted);
  font-size: 0.72rem;
  pointer-events: auto;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.icon-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(0,0,0,0.7);
  color: var(--text);
  cursor: pointer;
  pointer-events: auto;
  font-size: 0.75rem;
  display: grid;
  place-items: center;
  transition: border-color 150ms ease, background 150ms ease;
}

.icon-btn:active {
  background: rgba(255,255,255,0.1);
  border-color: var(--line-strong);
}

.screens {
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
}

.screen {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: max(18px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right)) max(90px, env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
}

.screen.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.state-playing .screens {
  pointer-events: none;
}

#introScreen {
  text-align: center;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
}

.brand-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 12px;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  color: var(--text);
  font-weight: 300;
  font-size: 1.6rem;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(3rem, 12vw, 7rem);
  line-height: 0.85;
  letter-spacing: 0.08em;
  font-weight: 200;
  color: var(--text);
}

h2 {
  font-size: clamp(1.8rem, 7vw, 3.5rem);
  line-height: 1;
  font-weight: 300;
  letter-spacing: 0.06em;
}

.tagline {
  max-width: 500px;
  margin: 12px auto 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.eyebrow {
  color: var(--muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.7rem;
}

.block-preview {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin: 24px 0;
}

.block-preview span {
  width: 18px;
  height: 18px;
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.05);
  animation: blockFloat 1.5s ease-in-out infinite;
}

.block-preview span:nth-child(1) { animation-delay: 0s; }
.block-preview span:nth-child(2) { animation-delay: 0.15s; }
.block-preview span:nth-child(3) { animation-delay: 0.3s; }
.block-preview span:nth-child(4) { animation-delay: 0.45s; }

@keyframes blockFloat {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(-8px); opacity: 1; }
}

.screen-panel {
  width: min(94vw, 420px);
  max-height: calc(100dvh - 36px);
  overflow: auto;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(20px, 4vw, 32px);
  text-align: center;
}

.wide-panel {
  width: min(94vw, 500px);
}

.small-panel {
  width: min(92vw, 360px);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin: 20px 0;
}

.result-grid div {
  min-height: 56px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.4);
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 10px;
}

.result-grid span {
  color: var(--muted);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.result-grid strong {
  color: var(--text);
  font-size: 1.2rem;
  font-weight: 400;
}

.menu-actions {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.menu-actions.horizontal {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.primary-btn,
.secondary-btn {
  min-height: 42px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease;
}

.primary-btn {
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.8rem;
}

.secondary-btn {
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.5);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.primary-btn:hover,
.secondary-btn:hover {
  border-color: var(--line-strong);
  background: rgba(255,255,255,0.08);
}

.submission-status {
  color: var(--muted);
  margin: 2px 0 10px;
  font-size: 0.72rem;
}

.mobile-controls {
  position: absolute;
  left: 0;
  right: 0;
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 6;
  display: none;
  justify-content: center;
  gap: 6px;
  padding: 0 12px;
  pointer-events: none;
}

.state-playing .mobile-controls {
  display: flex;
}

.ctrl-btn {
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(0,0,0,0.75);
  color: var(--text);
  pointer-events: auto;
  font-size: 1.1rem;
  display: grid;
  place-items: center;
  backdrop-filter: blur(4px);
  transition: background 100ms ease, border-color 100ms ease;
}

.ctrl-btn:active {
  background: rgba(255,255,255,0.1);
  border-color: var(--line-strong);
}

.ctrl-rotate {
  width: 52px;
}

.ctrl-drop {
  border-color: var(--line-strong);
}

.pop {
  animation: hudPop 200ms ease;
}

@keyframes hudPop {
  0% { transform: scale(1); }
  40% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@media (max-width: 720px) {
  .app {
    min-height: 480px;
  }

  .hud {
    top: max(6px, env(safe-area-inset-top));
    left: 6px;
    right: 6px;
    gap: 4px;
  }

  .hud-pill {
    min-height: 24px;
    padding: 3px 5px;
    gap: 3px;
  }

  .hud-pill span {
    font-size: 0.5rem;
  }

  .hud-pill strong {
    font-size: 0.65rem;
    min-width: 14px;
  }

  .player-chip {
    font-size: 0.62rem;
    max-width: 70px;
    min-height: 24px;
    padding: 3px 5px;
  }

  .icon-btn {
    width: 28px;
    height: 28px;
    font-size: 0.65rem;
  }

  .screen {
    padding-bottom: max(120px, env(safe-area-inset-bottom));
  }

  .screen-panel {
    padding: 16px;
  }

  .result-grid,
  .menu-actions.horizontal {
    grid-template-columns: 1fr;
  }

  .ctrl-btn {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
  }

  .ctrl-rotate {
    width: 46px;
  }
}

@media (min-width: 780px) and (pointer: fine) {
  .mobile-controls {
    display: none !important;
  }
}