:root {
  --bg: #080d18;
  --card: #101a29;
  --card-edge: #1b2a41;
  --lime: #d6fa50;
  --lime-dim: rgba(214, 250, 80, 0.35);
  --pink: #ff617e;
  --text: #b9c4d4;
  --text-quiet: #7d8aa0;
  --focus: #8fd0ff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(1100px 700px at 80% -10%, rgba(214, 250, 80, 0.05), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(255, 97, 126, 0.05), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.frame {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 32px 56px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 48px;
}

.brand__word {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-quiet);
}

.brand__signal {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 10px var(--lime-dim), 0 0 22px var(--lime-dim);
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: start;
}

.panel {
  background: linear-gradient(160deg, var(--card) 0%, #0d1523 100%);
  border: 1px solid var(--card-edge);
  border-radius: 20px;
  padding: 40px 36px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.panel__title {
  margin: 0 0 10px;
  font-size: clamp(56px, 8vw, 88px);
  line-height: 0.95;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #eef3fb;
  text-shadow: 0 0 32px rgba(214, 250, 80, 0.18);
}

.panel__hint {
  margin: 0 0 32px;
  font-size: 15px;
  color: var(--text-quiet);
  max-width: 30ch;
}

.panel__scores {
  display: flex;
  gap: 20px;
  margin: 0 0 32px;
}

.counter {
  flex: 1;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--card-edge);
  border-radius: 12px;
  padding: 14px 18px;
}

.counter dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-quiet);
}

.counter dd {
  margin: 6px 0 0;
  font-size: 30px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  appearance: none;
  border: 1px solid var(--card-edge);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 15px;
  padding: 12px 22px;
  cursor: pointer;
  transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
}

.btn:hover:not(:disabled) {
  border-color: var(--text-quiet);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--lime);
  border-color: var(--lime);
  color: #10160a;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(214, 250, 80, 0.22);
}

.btn--primary:hover:not(:disabled) {
  border-color: var(--lime);
  filter: brightness(1.05);
}

.btn:focus-visible,
.pad__btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.panel__status {
  margin: 24px 0 0;
  font-size: 14px;
  color: var(--text-quiet);
  min-height: 1.5em;
}

.panel__status.is-ended {
  color: var(--pink);
}

.board-wrap {
  position: relative;
}

#board {
  display: block;
  touch-action: none;
  width: 100%;
  max-width: 560px;
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 24px;
  border: 1px solid var(--card-edge);
  background:
    linear-gradient(rgba(148, 170, 200, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 170, 200, 0.05) 1px, transparent 1px),
    linear-gradient(160deg, #0c1524 0%, #0a1120 100%);
  background-size: calc(100% / 20) calc(100% / 20), calc(100% / 20) calc(100% / 20), 100% 100%;
  box-shadow:
    0 0 0 1px rgba(214, 250, 80, 0.06),
    0 0 48px rgba(214, 250, 80, 0.07),
    0 32px 80px rgba(0, 0, 0, 0.5);
}

.pad {
  display: none;
  grid-template-columns: repeat(3, 64px);
  grid-template-rows: repeat(2, 56px);
  gap: 10px;
  justify-content: center;
  margin: 28px auto 0;
}

.pad__btn {
  border: 1px solid var(--card-edge);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  touch-action: manipulation;
}

.pad__btn:active {
  background: var(--lime-dim);
  color: #10160a;
}

.pad__btn--up { grid-column: 2; grid-row: 1; }
.pad__btn--left { grid-column: 1; grid-row: 2; }
.pad__btn--down { grid-column: 2; grid-row: 2; }
.pad__btn--right { grid-column: 3; grid-row: 2; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 48px;
  font-size: 13px;
  color: var(--text-quiet);
}

@media (max-width: 760px) {
  .frame { padding: 12px 16px 32px; }
  .brand { gap: 10px; margin-bottom: 12px; }
  .layout { grid-template-columns: 1fr; gap: 16px; }
  .panel { padding: 18px 18px; }
  .panel__title { margin-bottom: 6px; font-size: clamp(40px, 12vw, 56px); }
  .panel__hint { margin-bottom: 14px; font-size: 14px; }
  .panel__scores { gap: 12px; margin-bottom: 14px; }
  .counter { padding: 8px 12px; border-radius: 10px; }
  .counter dt { font-size: 11px; }
  .counter dd { margin-top: 2px; font-size: 22px; }
  .panel__actions { gap: 8px; }
  .btn { padding: 12px 14px; }
  .panel__status { margin-top: 12px; }
  .board-wrap { margin-top: 0; }
  .pad {
    display: grid;
    grid-template-columns: repeat(4, minmax(44px, 58px));
    grid-template-rows: 48px;
    gap: 8px;
    margin-top: 12px;
  }
  .pad__btn--left { grid-column: 1; grid-row: 1; }
  .pad__btn--up { grid-column: 2; grid-row: 1; }
  .pad__btn--down { grid-column: 3; grid-row: 1; }
  .pad__btn--right { grid-column: 4; grid-row: 1; }
  .legend { margin-top: 20px; }
}

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

@media (max-width: 340px) {
  .frame { padding: 16px 12px 28px; }
  .panel { padding: 20px 16px; }
  .panel__title {
    font-size: 34px;
    letter-spacing: 0.01em;
    overflow-wrap: break-word;
  }
  .btn { font-size: 13px; padding: 10px 14px; }
  .counter { padding: 10px 12px; }
  .counter dd { font-size: 24px; }
}