:root {
  --bg: #070914;
  --bg-soft: #0e1530;
  --panel: #121b3e;
  --line: #344a86;
  --text: #deebff;
  --muted: #9ab0dc;
  --cyan: #69f6ff;
  --magenta: #ff67d4;
  --green: #71ffa5;
  --amber: #ffd77b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 8%, rgba(105, 246, 255, 0.14), transparent 40%),
    radial-gradient(circle at 90% 0%, rgba(255, 103, 212, 0.14), transparent 42%),
    var(--bg);
  color: var(--text);
}

.cabinet {
  width: min(1100px, calc(100% - 2rem));
  margin: 1.15rem auto 2rem;
}

.topbar {
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem 1.2rem;
  background: linear-gradient(160deg, rgba(19, 29, 68, 0.92), rgba(9, 13, 31, 0.92));
  box-shadow: 0 0 30px rgba(105, 246, 255, 0.08);
}

.kicker {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2.1rem);
}

.subtitle {
  margin: 0.45rem 0 0;
  color: var(--muted);
  max-width: 80ch;
}

.layout {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 1.8fr 1fr;
  gap: 1rem;
}

.board-panel,
.hud-panel {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: linear-gradient(180deg, rgba(18, 27, 62, 0.95), rgba(8, 11, 27, 0.95));
}

.board-panel {
  padding: 1rem;
}

.board {
  display: grid;
  grid-template-columns: repeat(5, minmax(48px, 1fr));
  gap: 0.6rem;
}

.locker {
  aspect-ratio: 1 / 1;
  border-radius: 0.62rem;
  border: 1px solid rgba(105, 246, 255, 0.35);
  background: linear-gradient(160deg, rgba(21, 32, 72, 0.9), rgba(10, 14, 32, 0.95));
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 140ms ease, border-color 120ms ease;
}

.locker:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 0 14px rgba(105, 246, 255, 0.28);
}

.locker:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.locker.open {
  border-color: rgba(113, 255, 165, 0.8);
  box-shadow: inset 0 0 20px rgba(113, 255, 165, 0.3), 0 0 14px rgba(113, 255, 165, 0.35);
  background: linear-gradient(165deg, rgba(20, 90, 64, 0.88), rgba(9, 42, 33, 0.95));
}

.locker.hint {
  border-color: rgba(255, 215, 123, 0.95);
  box-shadow: 0 0 16px rgba(255, 215, 123, 0.6);
}

.status {
  margin: 0.9rem 0 0;
  border: 1px solid rgba(105, 246, 255, 0.22);
  border-radius: 0.7rem;
  padding: 0.66rem 0.72rem;
  color: #c7d7f8;
  background: rgba(7, 11, 25, 0.8);
  min-height: 2.9rem;
}

.hud-panel {
  padding: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.52rem;
}

.stat {
  border: 1px solid rgba(105, 246, 255, 0.18);
  border-radius: 0.64rem;
  background: rgba(9, 15, 37, 0.86);
  padding: 0.5rem 0.58rem;
}

.stat span {
  display: block;
  font-size: 0.66rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

.stat strong {
  display: block;
  margin-top: 0.2rem;
  font-size: 1.05rem;
}

.controls {
  display: grid;
  gap: 0.52rem;
}

button {
  font: inherit;
  font-weight: 700;
  border-radius: 0.64rem;
  padding: 0.64rem 0.74rem;
  border: 1px solid transparent;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.primary {
  color: #051225;
  background: linear-gradient(180deg, #8efbff, #42d0e9);
}

.ghost {
  color: var(--text);
  background: rgba(11, 18, 43, 0.94);
  border-color: rgba(105, 246, 255, 0.35);
}

.tips {
  border: 1px dashed rgba(154, 176, 220, 0.45);
  border-radius: 0.64rem;
  padding: 0.58rem 0.68rem;
  background: rgba(6, 10, 24, 0.72);
}

.tips p {
  margin: 0.38rem 0;
  color: #c2d1f4;
  font-size: 0.9rem;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .cabinet {
    width: calc(100% - 1rem);
    margin-top: 0.55rem;
  }
}