:root {
  --bg-0: #040812;
  --bg-1: #071126;
  --bg-2: #0b1a34;
  --panel: rgba(8, 20, 45, 0.84);
  --panel-line: rgba(69, 173, 255, 0.32);
  --accent: #00e9ff;
  --accent-strong: #3bffb5;
  --danger: #ff4f8e;
  --text: #dbeaff;
  --text-dim: #8ea7ca;
  --shadow: rgba(0, 255, 255, 0.16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  font-family: "Rajdhani", "Segoe UI", sans-serif;
  color: var(--text);
  letter-spacing: 0.02em;
  background:
    radial-gradient(circle at 14% 20%, rgba(36, 123, 255, 0.22), transparent 34%),
    radial-gradient(circle at 82% 74%, rgba(0, 249, 213, 0.15), transparent 40%),
    linear-gradient(145deg, var(--bg-0), var(--bg-1) 48%, var(--bg-2));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 35%, rgba(255, 255, 255, 0.2) 0 1px, transparent 1px),
    radial-gradient(circle at 67% 62%, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px),
    radial-gradient(circle at 42% 80%, rgba(255, 255, 255, 0.12) 0 1px, transparent 1px);
  background-size: 210px 210px;
  opacity: 0.45;
}

.app-shell {
  height: 100vh;
  height: 100dvh;
  padding: clamp(8px, 1.8vmin, 16px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: clamp(8px, 1.4vmin, 14px);
  overflow: hidden;
}

.top-bar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  min-height: 0;
}

.top-bar h1 {
  margin: 0;
  font-family: "Orbitron", sans-serif;
  font-size: clamp(1rem, 1.8vw, 1.5rem);
  letter-spacing: 0.08em;
  color: #ecf4ff;
  text-shadow: 0 0 16px rgba(0, 219, 255, 0.3);
}

.status-text {
  margin: 0;
  font-weight: 700;
  font-size: clamp(0.78rem, 1.2vw, 1rem);
  color: var(--accent-strong);
}

.game-layout {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 27vw);
  gap: clamp(8px, 1.4vmin, 16px);
}

.panel {
  min-height: 0;
  border-radius: 16px;
  border: 1px solid var(--panel-line);
  background: linear-gradient(165deg, rgba(19, 38, 76, 0.88), var(--panel));
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.34),
    inset 0 0 0 1px rgba(170, 230, 255, 0.08),
    0 0 18px var(--shadow);
}

.board-panel {
  padding: clamp(8px, 1.2vmin, 12px);
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: clamp(8px, 1.2vmin, 12px);
}

.board-stage {
  min-height: 0;
  border-radius: 12px;
  border: 1px solid rgba(84, 168, 255, 0.35);
  background:
    radial-gradient(circle at 50% 10%, rgba(72, 134, 255, 0.14), transparent 58%),
    linear-gradient(180deg, rgba(7, 16, 32, 0.96), rgba(4, 9, 18, 0.98));
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#boardCanvas {
  display: block;
  border-radius: 10px;
  border: 1px solid rgba(82, 142, 255, 0.24);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: linear-gradient(180deg, #050a15, #040810);
}

.board-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  text-align: center;
  padding: 20px;
  background: linear-gradient(180deg, rgba(5, 11, 24, 0.68), rgba(4, 9, 18, 0.88));
  backdrop-filter: blur(3px);
  z-index: 4;
  transition: opacity 220ms ease;
}

.board-overlay h2 {
  margin: 0;
  font-family: "Orbitron", sans-serif;
  letter-spacing: 0.08em;
  font-size: clamp(1rem, 2.1vmin, 1.45rem);
}

.board-overlay p {
  margin: 0;
  color: var(--text-dim);
}

.board-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.primary-btn {
  border: 1px solid rgba(97, 255, 202, 0.9);
  border-radius: 999px;
  padding: 10px 16px;
  font-family: "Orbitron", sans-serif;
  font-size: 0.84rem;
  color: #d8fff3;
  background: linear-gradient(135deg, rgba(27, 191, 255, 0.3), rgba(63, 255, 170, 0.24));
  cursor: pointer;
}

.primary-btn:focus-visible,
.control-btn:focus-visible {
  outline: 2px solid #b5ffff;
  outline-offset: 2px;
}

.touch-controls {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
}

.control-btn {
  min-height: clamp(38px, 7vmin, 48px);
  border: 1px solid rgba(88, 157, 255, 0.62);
  border-radius: 10px;
  color: #d8e8ff;
  font-size: clamp(0.9rem, 2.4vmin, 1.2rem);
  font-weight: 700;
  background: linear-gradient(180deg, rgba(29, 59, 124, 0.95), rgba(18, 34, 70, 0.95));
  cursor: pointer;
  user-select: none;
  touch-action: none;
  transition: transform 80ms ease, border-color 140ms ease;
}

.control-btn:active {
  transform: translateY(1px) scale(0.98);
  border-color: rgba(149, 224, 255, 0.92);
}

.control-btn-accent {
  border-color: rgba(70, 255, 186, 0.88);
  background: linear-gradient(180deg, rgba(40, 119, 126, 0.95), rgba(16, 67, 80, 0.95));
  color: #d7ffef;
}

.control-btn-pause {
  border-color: rgba(255, 88, 151, 0.7);
}

.side-panel {
  padding: clamp(10px, 1.3vmin, 14px);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: clamp(8px, 1.2vmin, 12px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.stat-card {
  border-radius: 10px;
  padding: 8px;
  background: linear-gradient(180deg, rgba(30, 60, 122, 0.86), rgba(15, 31, 63, 0.9));
  border: 1px solid rgba(102, 178, 255, 0.28);
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.7rem;
  color: #99b5d8;
  margin-bottom: 4px;
  font-family: "Orbitron", sans-serif;
}

.stat-value {
  font-size: clamp(1.1rem, 2.5vmin, 1.35rem);
  color: #eff6ff;
  font-family: "Orbitron", sans-serif;
}

.next-panel,
.help-panel {
  border: 1px solid rgba(102, 178, 255, 0.24);
  border-radius: 12px;
  padding: 10px;
  background: linear-gradient(170deg, rgba(17, 37, 73, 0.86), rgba(12, 25, 50, 0.84));
  min-height: 0;
}

.next-panel h2,
.help-panel h2 {
  margin: 0 0 8px;
  font-family: "Orbitron", sans-serif;
  font-size: 0.82rem;
  color: #c9dcff;
  letter-spacing: 0.07em;
}

#nextCanvas {
  display: block;
  margin-inline: auto;
  width: min(100%, 150px);
  aspect-ratio: 1;
  border-radius: 8px;
  border: 1px solid rgba(104, 169, 255, 0.36);
  background: linear-gradient(180deg, rgba(4, 10, 22, 0.9), rgba(7, 16, 33, 0.94));
  image-rendering: pixelated;
}

.help-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

kbd {
  font-family: "Orbitron", sans-serif;
  font-size: 0.66rem;
  padding: 2px 5px;
  border-radius: 6px;
  border: 1px solid rgba(111, 168, 255, 0.56);
  background: rgba(21, 41, 83, 0.86);
  color: #e7f0ff;
  margin-right: 4px;
}

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

@media (max-width: 980px) {
  .game-layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .side-panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: auto;
  }
}

@media (max-width: 640px) {
  .touch-controls {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .help-panel {
    display: none;
  }
}

@media (max-height: 760px) {
  .top-bar h1 {
    font-size: clamp(0.9rem, 1.6vw, 1.2rem);
  }

  .help-panel {
    display: none;
  }
}

@media (hover: hover) and (pointer: fine) {
  .control-btn {
    min-height: 40px;
  }
}