/* ============================================================
   Snake Neon — stylesheet
   Themes: dark (default) + light
   Layout: responsive grid (info | board | controls)
   ============================================================ */

/* ---------- Theme tokens ---------- */
:root {
  --font-head: "Orbitron", "Trebuchet MS", sans-serif;
  --font-body: "Rajdhani", "Segoe UI", system-ui, sans-serif;

  /* Dark theme (default) */
  --bg-0: #050810;
  --bg-1: #0a0e1a;
  --bg-2: #111827;
  --bg-3: #1a2236;
  --panel: rgba(17, 24, 39, 0.72);
  --panel-border: rgba(56, 189, 248, 0.18);
  --text: #e5f2ff;
  --text-dim: #8aa0bd;
  --text-faint: #5b6b85;

  --neon-cyan: #22d3ee;
  --neon-green: #34d399;
  --neon-pink: #f472b6;
  --neon-purple: #a78bfa;
  --neon-gold: #fbbf24;
  --neon-orange: #fb923c;
  --neon-red: #f87171;

  --danger: #ef4444;
  --success: #22c55e;

  --accent: var(--neon-cyan);
  --accent-2: var(--neon-green);
  --glow: 0 0 18px rgba(34, 211, 238, 0.55);

  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
  --transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);

  --board-bg: #060912;
  --board-grid: rgba(56, 189, 248, 0.06);
}

[data-theme="light"] {
  --bg-0: #eef2f9;
  --bg-1: #f6f8fc;
  --bg-2: #ffffff;
  --bg-3: #e9eef7;
  --panel: rgba(255, 255, 255, 0.85);
  --panel-border: rgba(2, 132, 199, 0.16);
  --text: #0f172a;
  --text-dim: #475569;
  --text-faint: #94a3b8;

  --neon-cyan: #0891b2;
  --neon-green: #059669;
  --neon-pink: #db2777;
  --neon-purple: #7c3aed;
  --neon-gold: #d97706;
  --neon-orange: #ea580c;
  --neon-red: #dc2626;

  --accent: var(--neon-cyan);
  --accent-2: var(--neon-green);
  --glow: 0 0 14px rgba(8, 145, 178, 0.35);

  --shadow: 0 10px 30px rgba(15, 23, 42, 0.12);

  --board-bg: #f1f5f9;
  --board-grid: rgba(2, 132, 199, 0.08);
}

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

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

body {
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(167, 139, 250, 0.10), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(34, 211, 238, 0.10), transparent 60%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 60%, var(--bg-0));
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--transition), color var(--transition);
}

button { font-family: inherit; }

/* ---------- App shell ---------- */
.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: 2px;
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon { font-size: 1.2em; filter: drop-shadow(0 0 8px rgba(52, 211, 153, 0.6)); }
.logo-text { color: var(--text); text-shadow: 0 0 18px rgba(34, 211, 238, 0.35); }
.logo-accent {
  color: var(--accent);
  text-shadow: 0 0 16px rgba(34, 211, 238, 0.6);
}

.topbar-actions { display: flex; gap: 8px; }

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(8px);
}
.icon-btn:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: var(--glow); }
.icon-btn:active { transform: translateY(0); }

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 280px;
  gap: 22px;
  align-items: start;
}

@media (max-width: 1080px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 18px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.panel-title {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 0 0 14px;
}

/* ---------- Stats ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.stat {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg-2);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  min-width: 0;
}
.stat-grid--wide { grid-column: 1 / -1; }
.stat-icon { font-size: 1.3rem; line-height: 1; }
.stat-body { min-width: 0; }
.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-faint);
}
.stat-value {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  line-height: 1.1;
  transition: transform 180ms ease;
}
.stat-value.is-pop { animation: pop 360ms ease; }

.stat--gold .stat-value { color: var(--neon-gold); }
.stat--star .stat-value { color: var(--accent-2); }
.stat--rocket .stat-value { color: var(--neon-purple); }
.stat--bolt .stat-value { color: var(--neon-orange); }

/* ---------- Combo meter ---------- */
.combo-meter {
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--bg-2);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition), transform var(--transition);
}
.combo-meter.is-active { opacity: 1; transform: translateY(0); }
.combo-label {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--neon-pink);
  margin-bottom: 6px;
  font-size: 0.85rem;
  letter-spacing: 1px;
}
.combo-bar {
  height: 6px;
  background: var(--bg-3);
  border-radius: 99px;
  overflow: hidden;
}
.combo-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--neon-pink), var(--neon-gold));
  transition: width 100ms linear;
}

/* ---------- Legend ---------- */
.legend { margin-top: 16px; }
.legend-title {
  font-family: var(--font-head);
  font-size: 0.75rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 8px;
}
.legend-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.legend-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-dim);
}
.legend-list small { margin-left: auto; color: var(--text-faint); }
.dot {
  width: 12px; height: 12px; border-radius: 50%;
  display: inline-block; flex: none;
}
.dot--apple { background: var(--neon-red); box-shadow: 0 0 8px var(--neon-red); }
.dot--gold { background: var(--neon-gold); box-shadow: 0 0 8px var(--neon-gold); }
.dot--boost { background: var(--neon-orange); box-shadow: 0 0 8px var(--neon-orange); }
.dot--slow { background: var(--neon-purple); box-shadow: 0 0 8px var(--neon-purple); }
.dot--obstacle { background: var(--text-dim); border-radius: 3px; }

/* ---------- Board ---------- */
.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.board-frame {
  position: relative;
  width: min(70vh, 100%);
  max-width: 560px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  padding: 12px;
  background: linear-gradient(145deg, var(--bg-2), var(--bg-3));
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255,255,255,0.02);
}

.game-canvas {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 14px;
  background: var(--board-bg);
  touch-action: none;
}

.board-frame.is-eating { animation: eatflash 220ms ease; }
.board-frame.is-shaking { animation: shake 420ms cubic-bezier(0.36, 0.07, 0.19, 0.97); }

/* ---------- Overlay screens ---------- */
.overlay {
  position: absolute;
  inset: 12px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at center, rgba(5, 8, 16, 0.78), rgba(5, 8, 16, 0.92));
  backdrop-filter: blur(4px);
  transition: opacity var(--transition);
  z-index: 5;
  padding: 20px;
}
[data-theme="light"] .overlay {
  background: radial-gradient(circle at center, rgba(241, 245, 249, 0.85), rgba(241, 245, 249, 0.95));
}
.overlay.is-hidden { opacity: 0; pointer-events: none; }

.overlay-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  max-width: 360px;
  animation: fadeUp 320ms ease;
}
.overlay-card--hidden { display: none; }
.overlay-emoji { font-size: 3rem; filter: drop-shadow(0 0 14px rgba(34, 211, 238, 0.5)); }
.overlay-emoji--bounce { animation: bounce 900ms ease infinite; }
.overlay-title {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: 1.5px;
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  color: var(--text);
  text-shadow: 0 0 22px rgba(34, 211, 238, 0.4);
}
.overlay-title--danger { color: var(--neon-red); text-shadow: 0 0 22px rgba(248, 113, 113, 0.5); }
.overlay-title--gold { color: var(--neon-gold); text-shadow: 0 0 22px rgba(251, 191, 36, 0.6); }
.overlay-subtitle { margin: 0; color: var(--text-dim); font-size: 1rem; }
.overlay-hint { margin: 6px 0 0; color: var(--text-faint); font-size: 0.85rem; }
.overlay-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 6px; }

.result-row {
  display: flex;
  justify-content: space-between;
  width: 100%;
  gap: 18px;
  padding: 6px 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
}
[data-theme="light"] .result-row { background: rgba(15, 23, 42, 0.04); }
.result-row strong { font-family: var(--font-head); color: var(--accent); }

/* ---------- Toast ---------- */
.toast {
  position: absolute;
  top: 24px;
  left: 50%;
  transform: translate(-50%, -16px);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #031018;
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 1px;
  padding: 10px 18px;
  border-radius: 99px;
  box-shadow: 0 8px 30px rgba(34, 211, 238, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 8;
  white-space: nowrap;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), opacity var(--transition);
  color: var(--text);
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn:not(:disabled):hover { transform: translateY(-2px); }
.btn:not(:disabled):active { transform: translateY(0); }
.btn--lg { padding: 14px 28px; font-size: 1.1rem; }

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #031018;
  box-shadow: 0 6px 20px rgba(34, 211, 238, 0.35);
}
.btn--secondary {
  background: var(--bg-3);
  border-color: var(--panel-border);
}
.btn--ghost {
  background: transparent;
  border-color: var(--panel-border);
  color: var(--text-dim);
}
.btn--danger {
  background: linear-gradient(135deg, var(--danger), #b91c1c);
  color: #fff;
  border: none;
}

.game-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
  max-width: 560px;
}
.game-buttons .btn { flex: 1 1 140px; }

/* ---------- Side panel: D-pad ---------- */
.dpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 8px;
  width: 100%;
  max-width: 220px;
  margin: 0 auto 18px;
  aspect-ratio: 1 / 1;
}
.dpad-btn {
  border: 1px solid var(--panel-border);
  background: var(--bg-2);
  color: var(--accent);
  border-radius: 14px;
  font-size: 1.4rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}
.dpad-btn:hover { background: var(--bg-3); }
.dpad-btn:active { transform: scale(0.92); background: var(--accent); color: #031018; box-shadow: var(--glow); }
.dpad-up { grid-column: 2; grid-row: 1; }
.dpad-left { grid-column: 1; grid-row: 2; }
.dpad-center { grid-column: 2; grid-row: 2; background: radial-gradient(circle, var(--accent), transparent 70%); opacity: 0.25; border-radius: 50%; }
.dpad-right { grid-column: 3; grid-row: 2; }
.dpad-down { grid-column: 2; grid-row: 3; }

/* ---------- Active power-ups ---------- */
.active-effects { margin-bottom: 16px; }
.active-effects-title {
  font-family: var(--font-head);
  font-size: 0.7rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 8px;
}
.effects-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.effects-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-2);
  border-radius: 8px;
  font-size: 0.85rem;
  border: 1px solid var(--panel-border);
}
.effects-list .fx-time { margin-left: auto; font-family: var(--font-head); color: var(--text-dim); }
.effects-empty { color: var(--text-faint); font-size: 0.85rem; font-style: italic; }

/* ---------- Key hints ---------- */
.key-hints { display: grid; gap: 8px; }
.key-hint { font-size: 0.85rem; color: var(--text-dim); display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
kbd {
  font-family: var(--font-head);
  font-size: 0.72rem;
  padding: 2px 6px;
  background: var(--bg-2);
  border: 1px solid var(--panel-border);
  border-bottom-width: 2px;
  border-radius: 6px;
  color: var(--text);
  margin-right: 2px;
}

/* ---------- Footer ---------- */
.footer { text-align: center; color: var(--text-faint); font-size: 0.85rem; padding-top: 8px; }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal[aria-hidden="false"] { display: flex; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 6, 16, 0.7);
  backdrop-filter: blur(4px);
  animation: fadeIn 200ms ease;
}
[data-theme="light"] .modal-backdrop { background: rgba(15, 23, 42, 0.4); }
.modal-card {
  position: relative;
  background: var(--bg-1);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  width: min(440px, 100%);
  box-shadow: var(--shadow);
  animation: fadeUp 240ms ease;
}
.modal-card--sm { width: min(360px, 100%); }
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--panel-border);
}
.modal-head h2 { margin: 0; font-family: var(--font-head); font-size: 1.1rem; letter-spacing: 1px; }
.modal-body { padding: 18px 20px; display: grid; gap: 16px; }

.field { display: grid; gap: 6px; }
.field--row { grid-template-columns: 1fr auto; align-items: center; }
.field-label { font-weight: 600; color: var(--text); font-size: 0.95rem; }
.field-hint { margin: 0; color: var(--text-faint); font-size: 0.8rem; }

.select {
  appearance: none;
  width: 100%;
  padding: 10px 36px 10px 12px;
  background: var(--bg-2);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-dim) 50%),
    linear-gradient(135deg, var(--text-dim) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 12px) 50%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
.select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Switch */
.switch { position: relative; display: inline-block; width: 48px; height: 26px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider {
  position: absolute; inset: 0;
  background: var(--bg-3);
  border: 1px solid var(--panel-border);
  border-radius: 99px;
  transition: background var(--transition);
}
.switch-slider::before {
  content: ""; position: absolute;
  width: 18px; height: 18px; left: 3px; top: 3px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}
.switch input:checked + .switch-slider { background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.switch input:checked + .switch-slider::before { transform: translateX(22px); background: #031018; }

.confirm-title { margin: 0 0 6px; font-family: var(--font-head); }
.confirm-text { margin: 0 0 16px; color: var(--text-dim); }
.confirm-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ---------- Animations ---------- */
@keyframes pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.35); }
  100% { transform: scale(1); }
}
@keyframes eatflash {
  0% { box-shadow: var(--shadow), 0 0 0 0 rgba(52, 211, 153, 0.5); }
  50% { box-shadow: var(--shadow), 0 0 0 6px rgba(52, 211, 153, 0); }
  100% { box-shadow: var(--shadow); }
}
@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Responsive tweaks ---------- */
@media (max-width: 1080px) {
  .info-panel { order: 1; }
  .board-wrap { order: 2; }
  .side-panel { order: 3; }
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
  .stat-grid--wide { grid-column: 1 / -1; }
  .legend, .combo-meter { display: none; }
  .info-panel { display: flex; flex-direction: column; }
  .panel-title { text-align: center; }
}
@media (max-width: 640px) {
  .app { padding: 12px 12px 30px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-value { font-size: 1.1rem; }
  .key-hints { display: none; }
  .board-frame { padding: 8px; }
  .legend { display: none; }
  .game-buttons .btn { flex: 1 1 100%; }
}
@media (max-width: 380px) {
  .stat { padding: 8px; }
  .stat-icon { font-size: 1.1rem; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}