/* ============================================================
   SNAKE REWIND — stylesheet
   Themes via CSS variables · responsive layout · retro/neon FX
   ============================================================ */

/* ---------- Base tokens (shared) ---------- */
:root {
  --bg: #080B18;
  --panel: #11172A;
  --panel-2: #0c1222;
  --green: #39FF88;
  --cyan: #21D4FD;
  --purple: #A855F7;
  --pink: #FF4D9D;
  --gold: #FFD166;
  --text: #F4F7FF;
  --text-dim: #A4ADC6;

  --accent: var(--green);
  --accent-2: var(--cyan);

  --board-bg: #0a0f1f;
  --board-grid: rgba(255, 255, 255, 0.04);
  --snake-head: var(--green);
  --snake-body-a: var(--green);
  --snake-body-b: var(--cyan);
  --snake-glow: rgba(57, 255, 136, 0.55);
  --food: var(--pink);
  --food-glow: rgba(255, 77, 157, 0.6);

  --radius: 18px;
  --radius-sm: 11px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.5);
  --glow-soft: 0 0 18px;
  --font-ui: 'Space Grotesk', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-pixel: 'Press Start 2P', monospace;

  --fx: 1; /* visual effects multiplier, toggled off to 0 */
}

/* ---------- Theme: Neon Arcade (default) ---------- */
[data-theme="neon"] {
  --bg: #080B18;
  --panel: #11172A;
  --accent: var(--green);
  --accent-2: var(--cyan);
  --board-bg: #0a0f1f;
  --board-grid: rgba(255, 255, 255, 0.045);
  --snake-head: #7dffb4;
  --snake-body-a: #39FF88;
  --snake-body-b: #21D4FD;
  --snake-glow: rgba(57, 255, 136, 0.5);
  --food: #FF4D9D;
  --food-glow: rgba(255, 77, 157, 0.6);
}

/* ---------- Theme: Nokia Classic ---------- */
[data-theme="nokia"] {
  --bg: #0a1505;
  --panel: #10220a;
  --panel-2: #0b1a06;
  --text: #cfefb0;
  --text-dim: #7fae63;
  --accent: #9ef01a;
  --accent-2: #70b800;
  --board-bg: #86a515;
  --board-grid: rgba(20, 40, 5, 0.18);
  --snake-head: #1b2d05;
  --snake-body-a: #24380a;
  --snake-body-b: #1b2d05;
  --snake-glow: rgba(27, 45, 5, 0.25);
  --food: #203006;
  --food-glow: rgba(32, 48, 6, 0.3);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}

/* ---------- Theme: Candy Pop ---------- */
[data-theme="candy"] {
  --bg: #1b0f2e;
  --panel: #2a1648;
  --panel-2: #22123b;
  --text: #fff4ff;
  --text-dim: #d3b3e8;
  --accent: #FF4D9D;
  --accent-2: #FFD166;
  --board-bg: #241041;
  --board-grid: rgba(255, 255, 255, 0.06);
  --snake-head: #ffe29a;
  --snake-body-a: #A855F7;
  --snake-body-b: #FF4D9D;
  --snake-glow: rgba(168, 85, 247, 0.55);
  --food: #21D4FD;
  --food-glow: rgba(33, 212, 253, 0.6);
}

/* ---------- Theme: Synthwave ---------- */
[data-theme="synth"] {
  --bg: #1a0b2e;
  --panel: #271247;
  --panel-2: #1f0e39;
  --text: #ffeaf6;
  --text-dim: #c79bd8;
  --accent: #ff3d9a;
  --accent-2: #ff8e42;
  --board-bg: #170a2b;
  --board-grid: rgba(255, 142, 66, 0.09);
  --snake-head: #ffd36e;
  --snake-body-a: #ff3d9a;
  --snake-body-b: #b14aed;
  --snake-glow: rgba(255, 61, 154, 0.5);
  --food: #2de2e6;
  --food-glow: rgba(45, 226, 230, 0.6);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html, body {
  /* Stop swipes-to-steer from scrolling the page or triggering pull-to-refresh */
  overscroll-behavior: none;
}
body {
  min-height: 100dvh;
  font-family: var(--font-ui);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
  /* Prevent double-tap zoom while keeping taps responsive */
  touch-action: manipulation;
}
/* Interactive game surfaces: no accidental scroll, zoom, text-select or tap-highlight */
.board-frame, #board, .dpad, .dpad-btn, .icon-btn {
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

/* Animated gradient backdrop + faint grid */
body::before {
  content: "";
  position: fixed;
  inset: -20%;
  z-index: -2;
  background:
    radial-gradient(60% 50% at 20% 15%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
    radial-gradient(55% 45% at 85% 85%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 70%),
    var(--bg);
  background-size: 180% 180%;
  animation: bgShift 24s ease-in-out infinite;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--board-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--board-grid) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: calc(0.5 * var(--fx));
  mask-image: radial-gradient(circle at 50% 40%, #000 30%, transparent 85%);
}
@keyframes bgShift {
  0%, 100% { background-position: 0% 0%; }
  50% { background-position: 100% 100%; }
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 50%; top: -60px; transform: translateX(-50%);
  background: var(--accent); color: #041; padding: 8px 16px; border-radius: 0 0 8px 8px;
  z-index: 100; transition: top .2s; font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 0; }

/* ---------- Layout ---------- */
.app {
  max-width: 1200px;
  margin: 0 auto;
  padding:
    calc(clamp(14px, 3vw, 28px) + env(safe-area-inset-top))
    calc(16px + env(safe-area-inset-right))
    calc(16px + env(safe-area-inset-bottom))
    calc(16px + env(safe-area-inset-left));
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.4vw, 22px);
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  display: grid; place-items: center;
  width: 46px; height: 46px; border-radius: 13px;
  background: var(--panel);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent),
              var(--glow-soft) color-mix(in srgb, var(--accent) 35%, transparent);
}
.logo-seg { fill: var(--snake-body-b); }
.logo-head { fill: var(--accent); }
.logo-eye { fill: #04121a; }
.brand-title {
  font-family: var(--font-pixel);
  font-size: clamp(14px, 3.4vw, 20px);
  margin: 0; letter-spacing: 1px;
  color: var(--text);
  text-shadow: 0 0 calc(14px * var(--fx)) color-mix(in srgb, var(--accent) 65%, transparent);
}
.brand-badge {
  display: inline-block; margin-top: 5px;
  font-size: 10px; letter-spacing: 2px; font-weight: 700;
  color: var(--accent);
  padding: 3px 8px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
}
.header-controls { display: flex; gap: 8px; }

.icon-btn {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--panel); color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 18px; cursor: pointer;
  transition: transform .12s ease, box-shadow .2s, background .2s, border-color .2s;
}
.icon-btn:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.icon-btn:active { transform: translateY(0) scale(.96); }
.icon-btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* sound / pause icon state swaps */
.icon-sound-off, .icon-play { display: none; }
#btnSound[aria-pressed="false"] .icon-sound-on { display: none; }
#btnSound[aria-pressed="false"] .icon-sound-off { display: inline; }
#btnPause.is-paused .icon-pause { display: none; }
#btnPause.is-paused .icon-play { display: inline; }

/* ---------- Scoreboard ---------- */
.scoreboard {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.stat { text-align: center; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.stat-label {
  font-size: 10px; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--text-dim); font-weight: 600;
}
.stat-value {
  font-family: var(--font-pixel);
  font-size: clamp(12px, 2.6vw, 17px);
  color: var(--text);
}
.stat-score .stat-value { color: var(--accent); text-shadow: 0 0 calc(10px * var(--fx)) color-mix(in srgb, var(--accent) 60%, transparent); }
.stat-best .stat-value { color: var(--gold); }
.stat-value.bump { animation: bump .32s ease; }
@keyframes bump { 0% { transform: scale(1); } 40% { transform: scale(1.4); } 100% { transform: scale(1); } }

/* ---------- Stage ---------- */
.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: clamp(14px, 2.4vw, 22px);
  align-items: start;
}
.board-wrap { min-width: 0; }
.board-frame {
  position: relative;
  width: 100%;
  max-width: min(82vh, 720px);
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius);
  padding: 12px;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: var(--shadow),
              inset 0 0 0 1px color-mix(in srgb, var(--accent) 12%, transparent);
}
#board {
  width: 100%; height: 100%;
  display: block;
  border-radius: var(--radius-sm);
  background: var(--board-bg);
  touch-action: none;           /* only the board blocks native gestures */
  cursor: crosshair;
  outline: none;
}
#board:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 60%, transparent); }

/* retro scanlines in nokia theme */
[data-theme="nokia"] .board-frame::after {
  content: ""; position: absolute; inset: 12px;
  border-radius: var(--radius-sm);
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,.08) 0 2px, transparent 2px 4px);
  opacity: calc(1 * var(--fx));
  mix-blend-mode: multiply;
}

/* ---------- Overlay screens ---------- */
.overlay {
  position: absolute; inset: 12px;
  border-radius: var(--radius-sm);
  display: grid; place-items: safe center;
  background: color-mix(in srgb, var(--panel-2) 86%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  text-align: center;
  padding: 18px;
  transition: opacity .3s ease;
  /* If a screen (start / game-over) is taller than the board — e.g. landscape
     phones — scroll it inside the board instead of stretching the whole page.
     `safe center` keeps the top reachable when content overflows. */
  overflow-y: auto;
  overscroll-behavior: contain;
}
.overlay[hidden] { display: none; }
.overlay.is-hidden { opacity: 0; pointer-events: none; }
.overlay-screen { display: flex; flex-direction: column; align-items: center; gap: 14px; max-width: 320px; animation: fadeUp .35s ease; }
.overlay-screen[hidden] { display: none; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.overlay-title {
  font-family: var(--font-pixel);
  font-size: clamp(16px, 4.5vw, 24px);
  margin: 0; line-height: 1.5;
  text-shadow: 0 0 calc(18px * var(--fx)) color-mix(in srgb, var(--accent) 70%, transparent);
}
.overlay-sub { margin: 0; color: var(--text-dim); font-size: 14px; }
.overlay-actions { display: flex; flex-direction: column; gap: 10px; width: 100%; max-width: 240px; }
.overlay-mini-settings { display: flex; gap: 10px; align-items: center; justify-content: center; flex-wrap: wrap; margin-top: 6px; }
.btn-install { border-color: color-mix(in srgb, var(--accent) 45%, transparent); color: var(--accent); }
.install-ios-hint { margin: 2px 0 0; font-size: 12px; color: var(--text-dim); line-height: 1.4; max-width: 240px; }
.install-ios-hint strong { color: var(--accent); }
.mini-field { display: flex; flex-direction: column; gap: 4px; font-size: 11px; color: var(--text-dim); text-align: left; }

.mini-preview {
  width: 150px; height: 70px; border-radius: 10px;
  background: var(--board-bg);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.07);
  overflow: hidden;
}

.countdown-num {
  font-family: var(--font-pixel);
  font-size: clamp(60px, 18vw, 110px);
  color: var(--accent);
  text-shadow: 0 0 calc(40px * var(--fx)) color-mix(in srgb, var(--accent) 80%, transparent);
  animation: pop .9s ease;
}
@keyframes pop { 0% { transform: scale(.3); opacity: 0; } 40% { transform: scale(1.15); opacity: 1; } 100% { transform: scale(1); opacity: 1; } }

.over-stats { display: flex; gap: 14px; justify-content: center; }
.over-stat { display: flex; flex-direction: column; gap: 3px; font-size: 11px; color: var(--text-dim); }
.over-stat strong { font-family: var(--font-pixel); font-size: 16px; color: var(--text); }
.record-banner {
  font-family: var(--font-pixel); font-size: 12px; color: var(--gold); margin: 0;
  animation: flash 1s ease infinite alternate;
}
@keyframes flash { from { opacity: .55; text-shadow: none; } to { opacity: 1; text-shadow: 0 0 20px var(--gold); } }

/* ---------- Leaderboard ---------- */
.lb { width: 100%; max-width: 280px; display: flex; flex-direction: column; gap: 10px; }
.lb-entry { display: flex; flex-direction: column; gap: 6px; }
.lb-entry[hidden] { display: none; }
.lb-entry-label { font-size: 11px; color: var(--gold); font-weight: 600; letter-spacing: .3px; }
.lb-entry-row { display: flex; gap: 8px; justify-content: center; }
.lb-input {
  width: 92px; text-align: center; letter-spacing: 6px; text-transform: uppercase;
  font-family: var(--font-pixel); font-size: 15px;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--accent); border-radius: 10px; padding: 9px 6px;
}
.lb-input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.lb-list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 4px;
  width: 100%; max-height: 190px; overflow-y: auto;
  counter-reset: lb;
}
.lb-list li {
  counter-increment: lb;
  display: grid; grid-template-columns: 26px 1fr auto; align-items: center; gap: 8px;
  padding: 7px 10px; border-radius: 9px;
  background: color-mix(in srgb, var(--panel-2) 70%, transparent);
  font-size: 13px;
}
.lb-list li::before {
  content: counter(lb); font-family: var(--font-pixel); font-size: 10px;
  color: var(--text-dim); text-align: center;
}
.lb-list li:nth-child(1)::before { color: var(--gold); }
.lb-list li:nth-child(2)::before { color: #cdd6ea; }
.lb-list li:nth-child(3)::before { color: #e6a267; }
.lb-list .lb-name { font-family: var(--font-pixel); font-size: 12px; letter-spacing: 1px; text-align: left; }
.lb-list .lb-score { font-weight: 700; color: var(--accent); }
.lb-list li.is-new {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  box-shadow: 0 0 calc(14px * var(--fx)) color-mix(in srgb, var(--accent) 45%, transparent);
}
.lb-over .lb-list { max-height: 120px; }
.lb-empty { color: var(--text-dim); font-size: 13px; text-align: center; margin: 6px 0 0; }

/* floating score labels */
.floaters { position: absolute; inset: 12px; pointer-events: none; overflow: hidden; }
.floater {
  position: absolute; transform: translate(-50%, -50%);
  font-family: var(--font-pixel); font-size: 13px; font-weight: 700;
  color: var(--gold); text-shadow: 0 0 10px rgba(0,0,0,.6);
  animation: floatUp 1s ease forwards;
  white-space: nowrap;
}
@keyframes floatUp {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(.7); }
  20% { opacity: 1; transform: translate(-50%, -70%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -150%) scale(1); }
}

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font-ui);
  font-weight: 700; letter-spacing: .5px;
  border: none; cursor: pointer;
  padding: 13px 20px; border-radius: 12px;
  font-size: 14px; color: #041018;
  transition: transform .12s ease, box-shadow .2s, filter .2s;
}
.btn:active { transform: translateY(1px) scale(.98); }
.btn:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04121a;
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 35%, transparent);
}
.btn-primary:hover { filter: brightness(1.08); transform: translateY(-2px); }
.btn-glow { position: relative; }
.btn-glow::after {
  content: ""; position: absolute; inset: -3px; border-radius: 14px; z-index: -1;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  filter: blur(14px); opacity: calc(.55 * var(--fx));
  animation: glowPulse 2.4s ease-in-out infinite;
}
@keyframes glowPulse { 0%,100% { opacity: calc(.35 * var(--fx)); } 50% { opacity: calc(.7 * var(--fx)); } }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}
.btn-ghost:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); transform: translateY(-2px); }
.btn-danger { background: var(--pink); color: #2a0414; }
.btn-danger:hover { filter: brightness(1.08); }
.btn-sm { padding: 8px 14px; font-size: 12px; }

.chip {
  background: var(--panel-2); color: var(--text);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 999px; padding: 7px 14px; font-size: 12px; cursor: pointer;
  transition: border-color .2s, background .2s;
}
.chip[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

/* ---------- Side panel ---------- */
.side-panel { display: flex; flex-direction: column; gap: 16px; }
.info-card {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.info-card h3 { margin: 0 0 10px; font-size: 13px; letter-spacing: 1px; text-transform: uppercase; color: var(--text-dim); }
.howto-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; font-size: 13px; color: var(--text); }
.howto-list li { line-height: 1.5; }
kbd {
  display: inline-block; min-width: 20px; text-align: center;
  padding: 2px 6px; margin: 0 1px; border-radius: 6px;
  background: var(--panel-2); border: 1px solid rgba(255,255,255,.12);
  font-family: var(--font-ui); font-size: 11px; font-weight: 600; color: var(--text);
}

/* ---------- D-pad ---------- */
.dpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-areas:
    ".    up    ."
    "left ctr right"
    ".   down   .";
  gap: 8px;
  width: 190px; margin: 0 auto;
}
.dpad-up { grid-area: up; } .dpad-down { grid-area: down; }
.dpad-left { grid-area: left; } .dpad-right { grid-area: right; }
.dpad-center { grid-area: ctr; }
.dpad-btn {
  aspect-ratio: 1; min-height: 56px;
  border-radius: 14px; border: 1px solid rgba(255,255,255,.1);
  background: var(--panel); color: var(--text);
  font-size: 20px; cursor: pointer; user-select: none;
  -webkit-user-select: none; touch-action: manipulation;
  display: grid; place-items: center;
  transition: transform .08s ease, background .15s, box-shadow .15s, border-color .15s;
}
.dpad-btn:hover { border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.dpad-btn.is-press, .dpad-btn:active {
  transform: scale(.9);
  background: color-mix(in srgb, var(--accent) 22%, var(--panel));
  box-shadow: 0 0 calc(18px * var(--fx)) color-mix(in srgb, var(--accent) 45%, transparent);
  border-color: var(--accent);
}
.dpad-center { color: var(--accent); font-size: 18px; }
.dpad-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Footer ---------- */
.app-footer { text-align: center; color: var(--text-dim); font-size: 12px; opacity: .8; }
.app-footer p { margin: 0; }

/* ---------- Modals ---------- */
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 16px; }
.modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(2,4,12,.66); backdrop-filter: blur(3px); }
.modal-card {
  position: relative; width: min(440px, 100%);
  max-height: 86dvh; overflow: auto;
  background: var(--panel); border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius); box-shadow: var(--shadow);
  animation: fadeUp .25s ease;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-bottom: 1px solid rgba(255,255,255,.07); }
.modal-head h2 { margin: 0; font-size: 18px; }
.modal-body { padding: 16px 18px; display: flex; flex-direction: column; gap: 14px; }
.howto-body { font-size: 14px; line-height: 1.6; color: var(--text); }
.howto-body ul { padding-left: 18px; display: flex; flex-direction: column; gap: 8px; }

.field-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.field-row.field-col { align-items: flex-start; }
.field-with-hint { display: flex; flex-direction: column; gap: 6px; align-items: flex-end; }
.field-label, .field-row label { font-size: 14px; font-weight: 600; }
.hint { color: var(--text-dim); font-size: 11px; line-height: 1.4; max-width: 230px; text-align: right; }
.hint.is-error { color: var(--pink); }
.badge-mobile {
  font-size: 9px; letter-spacing: 1px; text-transform: uppercase; font-weight: 700;
  color: var(--accent-2); vertical-align: middle; margin-left: 6px;
  padding: 2px 6px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent-2) 40%, transparent);
}

.mini-select {
  background: var(--panel-2); color: var(--text);
  border: 1px solid rgba(255,255,255,.14); border-radius: 10px;
  padding: 8px 10px; font-family: var(--font-ui); font-size: 13px; cursor: pointer;
}
.mini-select:focus-visible { outline: 2px solid var(--accent); }

/* toggle switch */
.toggle {
  width: 50px; height: 28px; border-radius: 999px; cursor: pointer;
  background: var(--panel-2); border: 1px solid rgba(255,255,255,.14);
  position: relative; transition: background .2s, border-color .2s;
  flex: none;
}
.toggle-knob {
  position: absolute; top: 2px; left: 2px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--text-dim); transition: transform .2s, background .2s;
}
.toggle[aria-checked="true"] { background: color-mix(in srgb, var(--accent) 35%, transparent); border-color: var(--accent); }
.toggle[aria-checked="true"] .toggle-knob { transform: translateX(22px); background: var(--accent); }
.toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* segmented control */
.seg-group { display: inline-flex; background: var(--panel-2); border: 1px solid rgba(255,255,255,.12); border-radius: 10px; padding: 3px; }
.seg {
  border: none; background: transparent; color: var(--text-dim);
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 13px; font-weight: 600;
  transition: background .15s, color .15s;
}
.seg.is-active { background: var(--accent); color: #04121a; }
.seg:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* screen flash on collision */
.app.shake { animation: shake .4s ease; }
@keyframes shake {
  0%,100% { transform: translate(0,0); }
  20% { transform: translate(-6px, 3px); }
  40% { transform: translate(5px, -3px); }
  60% { transform: translate(-4px, 2px); }
  80% { transform: translate(3px, -2px); }
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .stage { grid-template-columns: 1fr; }
  /* Fit the board to whichever is smaller: screen width, or the height left
     after the header, scoreboard and D-pad. dvh tracks the collapsing URL bar. */
  .board-frame { max-width: min(92vw, calc(100dvh - 330px)); }
  .side-panel { order: 2; }
  .info-card { order: 2; }
  .dpad { order: 1; width: 220px; }
  .dpad-btn { min-height: 62px; }
}

@media (max-width: 520px) {
  .app { gap: 10px; }
  /* phone: keep the whole game on one screen. The footer links and the keyboard
     "how to play" legend aren't useful on touch — the HOW TO PLAY button covers it. */
  .app-footer { display: none; }
  .info-card { display: none; }
  .scoreboard { grid-template-columns: repeat(3, 1fr); gap: 8px 6px; }
  .brand-title { font-size: 15px; }
  /* leave room for header + scoreboard + D-pad so the column fits one screen */
  .board-frame { max-width: min(90vw, calc(100dvh - 320px)); padding: 9px; }
  .overlay { inset: 9px; }
  .floaters, .board-frame::after { inset: 9px; }
  .dpad { width: min(72vw, 240px); }
  .stage { gap: 10px; }
}

/* Landscape phones: a short viewport (~390px tall) can't give a SQUARE board any
   height if the header AND scoreboard both stack above it. So restructure: only
   the thin header stays on top; the scoreboard moves into the right-hand column
   above the D-pad, freeing almost the whole viewport height for the board.
   `.stage` uses display:contents so its board-wrap / side-panel become direct
   grid items of .app and can be laid out alongside the scoreboard.
   Covers landscape heights up to 700px — tall foldables/phablets included — so the
   board never falls back to the portrait rule (which gives a tiny box in landscape). */
@media (max-height: 700px) and (orientation: landscape) {
  .app {
    padding-top: calc(6px + env(safe-area-inset-top));
    gap: 8px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) clamp(168px, 30vw, 224px);
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "header header"
      "board  score"
      "board  side";
    align-items: start;
  }
  .app-footer, .info-card { display: none; }
  .app-header { grid-area: header; }
  .stage { display: contents; }
  .board-wrap { grid-area: board; align-self: center; }
  .scoreboard { grid-area: score; }
  .side-panel { grid-area: side; }

  /* compact the top chrome so the board gets the vertical room */
  .brand-badge { display: none; }
  .brand-logo svg { width: 24px; height: 24px; }
  .brand-title { font-size: 14px; }
  /* scoreboard now lives in the narrow right column: 3-up over 2 rows */
  .scoreboard { grid-template-columns: repeat(3, 1fr); padding: 7px 8px; gap: 5px 4px; }
  .scoreboard .stat { padding: 1px 0; }
  .scoreboard .stat-label { font-size: 9px; letter-spacing: 1px; }
  .scoreboard .stat-value { font-size: 14px; }

  /* board is capped by leftover height (dvh − header − gaps) — no longer by the
     scoreboard, so it can be ~20% taller than before */
  .board-frame { max-width: min(68vw, calc(100dvh - 68px)); padding: 9px; }
  .overlay, .floaters, .board-frame::after { inset: 9px; }

  /* park the D-pad at the bottom of the right column, in the thumb zone */
  .dpad { width: 100%; max-width: 224px; margin: 0 auto; align-self: end; }
  .dpad-btn { min-height: 46px; }

  /* compact the start / game-over overlay so it fits the short height */
  .overlay { padding: 10px; }
  .overlay-screen { gap: 8px; }
  .overlay-title { font-size: 20px; }
  .overlay-sub { font-size: 12px; }
  .overlay-actions { gap: 7px; }
  .overlay-mini-settings { margin-top: 2px; }
}

/* ---------- Accessibility: reduced motion / low-FX ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}
.app.low-fx body::before { animation: none; }

/* Phone: give the start-screen setting controls comfortable (44px) tap targets */
@media (max-width: 600px) {
  .overlay-mini-settings .chip,
  .overlay-mini-settings .mini-select {
    min-height: 44px;
    padding-top: 10px;
    padding-bottom: 10px;
  }
}