:root {
  color-scheme: dark;
  --bg: #101726;
  --surface: #172539;
  --surface-strong: #1f2c46;
  --text: #eef3ff;
  --muted: #9fb2d1;
  --accent: #7ee3a5;
  --danger: #ff7c95;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 18px 45px rgba(4, 9, 25, 0.18);
}

body.light {
  color-scheme: light;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-strong: #edf1f8;
  --text: #121826;
  --muted: #5f6c84;
  --accent: #3d86ff;
  --danger: #e74c3c;
  --border: rgba(18, 34, 68, 0.08);
  --shadow: 0 18px 45px rgba(32, 55, 89, 0.08);
}

body.retro {
  color-scheme: dark;
  --bg: #121314;
  --surface: #1f262d;
  --surface-strong: #28323b;
  --text: #e8f4ff;
  --muted: #8fa4c3;
  --accent: #ffb74d;
  --danger: #ff5a67;
  --border: rgba(255, 255, 255, 0.1);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, rgba(126, 227, 165, 0.18), transparent 32%), var(--bg);
  color: var(--text);
}

body {
  line-height: 1.5;
}

button,
select {
  font: inherit;
}

button {
  border: none;
  cursor: pointer;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 18px 36px;
}

.hero {
  display: grid;
  gap: 20px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.82rem;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
}

.subtitle {
  margin: 12px 0 0;
  color: var(--muted);
  max-width: 700px;
}

.status-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.status-card {
  padding: 18px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid var(--border);
}

.status-card span {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
}

.status-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.7rem;
}

main {
  display: grid;
  gap: 24px;
}

.game-grid {
  display: grid;
  gap: 24px;
}

.config-card,
.board-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 22px;
}

.config-card h2,
.controls-card h3 {
  margin: 0 0 16px;
}

label {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 0.96rem;
}

select {
  width: 100%;
  appearance: none;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  padding: 12px 14px;
}

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

button,
.direction-button {
  padding: 14px 18px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(126,227,165,.22), rgba(126,227,165,.1));
  color: var(--text);
  min-width: 112px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

button:hover,
.direction-button:hover {
  transform: translateY(-1px);
}

button:active,
.direction-button:active {
  transform: translateY(0);
}

button.secondary {
  background: rgba(255,255,255,.06);
}

.controls-card {
  margin-top: 22px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.controls-card button {
  width: 100%;
}

.board-card {
  position: relative;
}

.game-board {
  width: min(100%, 640px);
  aspect-ratio: 1;
  margin: 0 auto;
  background: radial-gradient(circle at top left, rgba(126,227,165,.14), transparent 28%), radial-gradient(circle at bottom right, rgba(255,124,149,.12), transparent 28%), #09101d;
  border-radius: 28px;
  border: 1px solid rgba(255,255,255,0.08);
  display: grid;
  grid-template-columns: repeat(var(--grid-size, 15), 1fr);
  grid-template-rows: repeat(var(--grid-size, 15), 1fr);
  gap: 4px;
  padding: 8px;
}

.cell {
  background: rgba(255,255,255,0.03);
  border-radius: 12px;
  transition: background 0.2s ease, transform 0.1s ease;
}

.cell-snake {
  background: var(--accent);
  box-shadow: inset 0 0 14px rgba(126,227,165,0.6);
}

.cell-head {
  background: #ffffff;
}

.cell-food {
  background: var(--danger);
  box-shadow: 0 0 20px rgba(255,124,149,0.45);
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(8, 12, 20, 0.75);
  border-radius: 28px;
}

.overlay.hidden {
  display: none;
}

.overlay-card {
  padding: 28px;
  max-width: 320px;
  text-align: center;
  background: rgba(18,28,44,0.95);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 24px;
}

.overlay-card p {
  margin: 0 0 18px;
  color: var(--text);
}

.direction-panel {
  display: grid;
  justify-items: center;
  gap: 16px;
}

.direction-row {
  display: flex;
  gap: 16px;
}

.direction-button {
  width: 88px;
  height: 58px;
  font-size: 1.25rem;
}

.footer-note {
  margin-top: 32px;
  text-align: center;
  color: var(--muted);
}

.cookie-banner {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 16px 20px;
  border-radius: 18px;
  background: rgba(20, 32, 50, 0.95);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow);
}

.cookie-banner.hidden {
  display: none;
}

.cookie-banner button {
  min-width: auto;
}

@media (min-width: 900px) {
  main {
    gap: 32px;
  }

  .game-grid {
    grid-template-columns: minmax(320px, 320px) minmax(360px, 1fr);
    align-items: start;
  }

  .direction-panel {
    justify-items: start;
  }
}