:root{
  /* Tokens */
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "DejaVu Sans Mono", "Roboto Mono", "Courier New", monospace;
  --font-sans: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --radius: 6px;
  --hairline: 1px;
  --motion-base: 160ms;

  /* Design tokens (dark mode) */
  --color-bg-base:#0F172A;
  --color-bg-panel:#1E293B;
  --color-line-hair:#334155;
  --color-text-primary:#E2E8F0;
  --color-text-secondary:#94A3B8;
  --color-text-muted:#64748B;
  --color-accent:#38BDF8; /* single disciplined accent */
  --color-danger:#F43F5E;
  --color-obstacle:#4A5568;

  /* Map to existing vars */
  --bg:var(--color-bg-base);
  --fg:var(--color-text-primary);
  --muted:var(--color-text-muted);
  --accent:var(--color-accent);
  --accent-2:var(--color-accent);
  --danger:var(--color-danger);
  --tile:var(--color-bg-panel);

  /* Canvas theme hooks */
  --board-bg:#0F172A;
  --grid-color:rgba(51, 65, 85, 0.5); /* hairline grid */
  --snake-body:var(--color-accent);
  --snake-head:#7DD3FC; /* subtle highlight for head */
  --obstacle-color:var(--color-obstacle);
  --accent-soft:rgba(56, 189, 248, 0.28);
  --accent-strong:rgba(125, 211, 252, 0.6);
}

/* Classic Green theme */
:root[data-theme="classic"]{
  --color-bg-base:#07140C;
  --color-bg-panel:#0C1F13;
  --color-line-hair:#11331F;
  --color-text-primary:#E3F9E5;
  --color-text-secondary:#9AD3B4;
  --color-text-muted:#79B795;
  --color-accent:#22C55E; /* green */
  --color-danger:#F43F5E;
  --color-obstacle:#1F4B2E;

  --board-bg:#07140C;
  --grid-color:rgba(17, 51, 31, 0.55);
  --snake-body:#22C55E;
  --snake-head:#86EFAC;
  --obstacle-color:#1F4B2E;
  --accent-soft:rgba(34, 197, 94, 0.32);
  --accent-strong:rgba(134, 239, 172, 0.62);
}

/* High-Contrast theme */
:root[data-theme="hc"]{
  --color-bg-base:#000000;
  --color-bg-panel:#0A0A0A;
  --color-line-hair:#555555;
  --color-text-primary:#FFFFFF;
  --color-text-secondary:#E0E0E0;
  --color-text-muted:#BDBDBD;
  --color-accent:#FFD400; /* vivid yellow */
  --color-danger:#FF2D2D;
  --color-obstacle:#7A7A7A;

  --board-bg:#000000;
  --grid-color:rgba(255,255,255,0.18);
  --snake-body:#FFFFFF;
  --snake-head:#FFD400;
  --obstacle-color:#7A7A7A;
  --accent-soft:rgba(255, 212, 0, 0.42);
  --accent-strong:rgba(255, 255, 255, 0.68);
}
*{
  box-sizing: border-box;
}
html, body, #app {
  height: 100%;
}
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
  background-image: radial-gradient(circle at 1px 1px, var(--color-line-hair) 1px, transparent 0);
  background-size: 24px 24px;
}
a { color: inherit; text-decoration: underline; }
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:0 16px; min-height:56px;
  border-bottom:1px solid var(--color-line-hair);
  position:sticky; top:0; background:var(--bg);
}
@media (min-width:768px){ .topbar{min-height:64px} }
.topbar{ background: linear-gradient(to bottom, rgba(15,23,42,0.92), rgba(15,23,42,0.68)); }
@supports ((-webkit-backdrop-filter: none) or (backdrop-filter: none)){
  .topbar{ -webkit-backdrop-filter: saturate(1.15) blur(6px); backdrop-filter: saturate(1.15) blur(6px); }
}
.topbar h1{
  font-family: var(--font-mono);
  font-size:18px; margin:0; letter-spacing:-0.01em; font-weight:600; color:var(--fg);
}
.scores{display:flex; gap:12px; color:var(--color-text-secondary); font-size:14px; align-items:center; font-family: var(--font-mono)}
.scores span{padding:4px 8px; border:1px solid var(--color-line-hair); border-radius:4px; background:var(--color-bg-panel); transition: box-shadow var(--motion-base) ease, border-color 220ms ease;}
.scores strong{color:var(--fg); font-weight:700}

/* Speed badge */
.speed-badge{ display:inline-block; min-width: 0; padding:4px 8px; border-radius: 999px; border: var(--hairline) solid var(--color-line-hair); background: var(--color-bg-panel); color: var(--color-text-secondary); font-weight:700; font-family: var(--font-mono); opacity:0; transform: translateY(-2px); transition: opacity var(--motion-base) ease, transform var(--motion-base) ease, background var(--motion-base) ease, color var(--motion-base) ease, border-color var(--motion-base) ease; }
.speed-badge.show{ opacity:1; transform: translateY(0); }
.speed-badge.low{ background:rgba(56,189,248,0.08); border-color:rgba(56,189,248,0.2); color:#9bdcff; }
.speed-badge.med{ background:rgba(56,189,248,0.15); border-color:rgba(56,189,248,0.35); color:#bfe9ff; }
.speed-badge.high{ background:rgba(56,189,248,0.25); border-color:rgba(56,189,248,0.55); color:#e6f6ff; }

@keyframes ambient-drift{
  from{ transform: scale(0.98) rotate(-2deg); }
  50%{ transform: scale(1) rotate(0deg); }
  to{ transform: scale(1.03) rotate(3deg); }
}

:root[data-speed-tier="low"] .stage-wrap::before{
  opacity:0.32;
  filter: blur(36px) saturate(1.02);
  animation-duration:16s;
  transform: scale(0.97);
}
:root[data-speed-tier="med"] .stage-wrap::before{
  opacity:0.48;
  filter: blur(30px) saturate(1.12);
  animation-duration:12s;
  transform: scale(1);
}
:root[data-speed-tier="high"] .stage-wrap::before{
  opacity:0.68;
  filter: blur(24px) saturate(1.24);
  animation-duration:8s;
  transform: scale(1.04);
}

:root[data-speed-tier="med"] .topbar{
  box-shadow: 0 1px 0 rgba(0,0,0,0.65), 0 18px 42px var(--accent-soft);
}
:root[data-speed-tier="high"] .topbar{
  box-shadow: 0 1px 0 rgba(0,0,0,0.7), 0 24px 60px var(--accent-strong);
}

:root[data-speed-tier="med"] .scores span{
  border-color: rgba(148, 163, 184, 0.4);
  box-shadow: 0 0 14px var(--accent-soft);
}
:root[data-speed-tier="high"] .scores span{
  border-color: rgba(148, 163, 184, 0.2);
  box-shadow: 0 0 18px var(--accent-strong);
}

@media (prefers-reduced-motion: reduce){
  .stage-wrap::before{ animation:none; transform: scale(1); }
}

.topbar .actions{display:none; gap:8px; align-items:center}
.desktop-only{display:none}
@media (pointer:fine){
  .desktop-only{display:flex}
  .topbar .actions{display:flex}
}
.stage-wrap{position:relative; display:flex; align-items:center; justify-content:center; padding:12px}
.stage-wrap{position:relative; display:flex; align-items:center; justify-content:center; padding:12px}
#stage{
  position:relative;
  z-index:1;
  border:var(--hairline) solid var(--color-line-hair);
  background:var(--tile);
  border-radius:var(--radius); touch-action:none; display:block;
  box-shadow: 0 8px 24px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.02) inset;
}
.stage-wrap::before{
  content:"";
  position:absolute;
  inset: clamp(-28px, -8vmin, -48px);
  border-radius: clamp(24px, 12vmin, 72px);
  pointer-events:none;
  z-index:0;
  background:
    radial-gradient(120% 110% at 20% 80%, var(--accent-soft) 0%, transparent 70%),
    radial-gradient(140% 100% at 80% 25%, var(--accent-strong) 0%, transparent 65%),
    radial-gradient(160% 120% at 50% 60%, rgba(255,255,255,0.1) 0%, transparent 72%);
  opacity:0.38;
  filter: blur(34px) saturate(1.05);
  transform: scale(0.98);
  transition: opacity 220ms ease, filter 280ms ease, transform 1.2s ease;
  animation: ambient-drift 14s ease-in-out infinite alternate;
  mix-blend-mode: screen;
}
.stage-wrap > *{position:relative; z-index:1;}
.overlay{position:absolute; inset:16px; display:flex; align-items:center; justify-content:center; background:rgba(0,0,0,0.5); backdrop-filter: blur(2px) saturate(1.06); z-index:2;}
.overlay.hidden{display:none}
.overlay-content{
  background:var(--color-bg-panel);
  padding:16px 20px; border:var(--hairline) solid var(--color-line-hair); border-radius:var(--radius); text-align:center;
}

/* CRT theme overlays (scanlines + vignette) */
:root[data-theme="crt"] .stage-wrap::after{
  content: ""; position:absolute; inset:12px; pointer-events:none; border-radius: var(--radius);
  background:
    linear-gradient(transparent, rgba(0,0,0,0.25)) /* vignette */,
    repeating-linear-gradient(to bottom, rgba(255,255,255,0.04), rgba(255,255,255,0.04) 1px, rgba(0,0,0,0.0) 3px, rgba(0,0,0,0.0) 4px) /* scanlines */;
  mix-blend-mode: overlay;
}
@media (prefers-reduced-motion: reduce){
  :root[data-theme="crt"] .stage-wrap::after{ background:
    linear-gradient(transparent, rgba(0,0,0,0.25)),
    repeating-linear-gradient(to bottom, rgba(255,255,255,0.03), rgba(255,255,255,0.03) 1px, rgba(0,0,0,0.0) 3px, rgba(0,0,0,0.0) 4px);
  }
}

/* CRT theme colors */
:root[data-theme="crt"]{
  --color-bg-base:#0A0D10;
  --color-bg-panel:#0C1218;
  --color-line-hair:#1A2733;
  --color-text-primary:#E2F2FF;
  --color-text-secondary:#A5C3DA;
  --color-text-muted:#7EA4BE;
  --color-accent:#00E5FF;
  --color-danger:#FF4D6D;
  --color-obstacle:#334455;

  --board-bg:#0A0D10;
  --grid-color:rgba(0, 229, 255, 0.10);
  --snake-body:#00E5FF;
  --snake-head:#7FF3FF;
  --obstacle-color:#334455;
  --accent-soft:rgba(0, 229, 255, 0.35);
  --accent-strong:rgba(127, 243, 255, 0.65);
}

/* Speed meter (under canvas, centered) */
.speed-meter{ position:absolute; left:50%; bottom:10px; transform:translateX(-50%); width: clamp(140px, 40vmin, 280px); pointer-events:none; }
.speed-meter__track{ position:relative; width:100%; height:6px; background: rgba(255,255,255,0.06); border: 1px solid var(--color-line-hair); border-radius:999px; overflow:hidden; }
.speed-meter__fill{ position:absolute; left:0; top:0; height:100%; width:0%; background: linear-gradient(90deg, var(--color-accent), #9bdcff); border-right: 1px solid rgba(255,255,255,0.4); transition: width var(--motion-base) ease; }
.speed-meter__fill::after{ content:""; position:absolute; inset:0; background: repeating-linear-gradient(135deg, rgba(255,255,255,0.08) 0, rgba(255,255,255,0.08) 6px, transparent 6px, transparent 12px); opacity:0; }
.speed-meter__fill.med::after{ opacity:0.35; animation: speed-stripes 1.2s linear infinite; }
.speed-meter__fill.high::after{ opacity:0.55; animation: speed-stripes 0.8s linear infinite; }
@keyframes speed-stripes{ from{ background-position:0 0 } to{ background-position: 24px 0 } }
@media (prefers-reduced-motion: reduce){ .speed-meter__fill.med::after, .speed-meter__fill.high::after{ animation:none } }
@media (prefers-reduced-motion: reduce){ .speed-meter__fill{ transition:none } }
.overlay h2{margin:6px 0 4px; color:var(--fg); letter-spacing:-0.01em}
.overlay .muted{color:var(--muted); margin:0 0 10px}
.overlay .settings{display:grid; gap:8px; margin-top:8px}
.overlay .settings .row{display:flex; gap:8px; justify-content:center; align-items:center}
.btn{
  appearance:none; border-radius:var(--radius); cursor:pointer;
  background:transparent; color:var(--fg); border:var(--hairline) solid var(--color-line-hair);
  padding:8px 14px; font-family: var(--font-mono); font-weight:600; letter-spacing:0;
  transition: background var(--motion-base) ease, color var(--motion-base) ease, border-color var(--motion-base) ease;
}
.btn:hover{border-color:#2A2D33}
.btn:active{background:#0F1012}
.btn:focus-visible{outline:2px solid var(--color-accent); outline-offset:3px}
.btn-primary{background:var(--color-accent); color:#0B0B0B; border-color:var(--color-accent)}
.btn-primary:hover{filter:brightness(0.96)}
.btn-primary:active{filter:brightness(0.92)}
.btn-outline{background:transparent; color:var(--fg); border-color:var(--color-line-hair)}
.btn[disabled]{opacity:.4; cursor:not-allowed}
.controls{
  display:flex; align-items:center; justify-content:space-between; gap:12px; padding:16px;
  padding-bottom:calc(16px + env(safe-area-inset-bottom));
  border-top:var(--hairline) solid var(--color-line-hair); position:sticky; bottom:0;
  background:var(--bg);
}
.dpad{display:grid; grid-template-rows:auto auto auto; grid-template-columns:auto; place-items:center; gap:8px}
.dpad .mid{display:flex; gap:8px}
.pad{
  width:64px; height:64px; border-radius:var(--radius);
  background:var(--color-bg-panel);
  color:var(--fg); border:var(--hairline) solid var(--color-line-hair); font-size:20px;
  font-family: var(--font-mono);
}
.pad:hover{border-color:#2A2D33}
.pad:active{background:#0F1012}
.pad:focus-visible{outline:2px solid var(--color-accent); outline-offset:3px}
.actions{display:flex; gap:8px}

@media (min-width: 720px){
  #stage{max-height:68vh}
}

/* Prefer keyboard/mouse UX on desktops: hide D‑pad for fine pointers */
@media (pointer: fine){
  .dpad{display:none}
  .controls{display:none}
}

/* Larger touch targets on coarse pointers */
@media (pointer: coarse){ .btn, .pad{height:48px} }
@media (pointer: fine){ .btn{height:32px; padding:0 12px} }

/* Density + typography */
.btn, .pad{height:40px; padding:0 16px}

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

.controls{background:var(--bg); border-top:1px solid var(--color-line-hair); padding:16px}
/* monospace labels */
.label{ font-family: var(--font-mono); font-size:12px; letter-spacing:.06em; text-transform:uppercase; color: var(--color-text-muted); }

/* removed scanline overlay for brutalist clarity */

#leaderboard {
  margin-top: 20px;
}

#leaderboard h3 {
  margin: 0 0 10px;
  color: var(--fg);
  letter-spacing: -0.01em;
}

#leaderboard ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

#leaderboard li {
  padding: 5px 0;
  border-bottom: var(--hairline) solid var(--color-line-hair);
  font-family: var(--font-mono);
  text-align: right; /* numbers align like a ruler */
}

#leaderboard li:last-child {
  border-bottom: none;
}

#onboarding-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Banner (under header) */
.banner{
  margin: 0 12px;
  margin-top: 8px;
  border: var(--hairline) solid var(--color-line-hair);
  background: var(--color-bg-panel);
  color: var(--fg);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 8px 12px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--motion-base) ease, opacity var(--motion-base) ease, transform var(--motion-base) ease;
  transform: translateY(-4px);
}
.banner.show{
  max-height: 72px;
  opacity: 1;
  transform: translateY(0);
}
.banner.info{ border-color: var(--color-line-hair); }
.banner.good{ border-color: rgba(34,197,94,0.6); box-shadow: 0 0 0 1px rgba(34,197,94,0.2) inset; }
.banner.warn{ border-color: rgba(234,179,8,0.6); box-shadow: 0 0 0 1px rgba(234,179,8,0.2) inset; }
.banner.bad{  border-color: rgba(244,63,94,0.6); box-shadow: 0 0 0 1px rgba(244,63,94,0.25) inset; }

/* Toasts (top-right) */
.toasts{
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  right: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 50;
  pointer-events: none; /* clicks pass through by default */
}
.toast{
  min-width: 200px;
  max-width: min(88vw, 360px);
  padding: 10px 12px;
  border-radius: var(--radius);
  border: var(--hairline) solid var(--color-line-hair);
  background: var(--color-bg-panel);
  color: var(--fg);
  font-family: var(--font-mono);
  font-weight: 600;
  box-shadow: 0 8px 20px rgba(0,0,0,0.35);
  opacity: 0;
  transform: translateY(-6px);
  animation: toast-in 180ms ease forwards;
  pointer-events: auto; /* allow dismiss on click */
}
.toast.info{ border-color: var(--color-line-hair); }
.toast.good{ border-color: rgba(34,197,94,0.6); box-shadow: 0 8px 20px rgba(34,197,94,0.08); }
.toast.warn{ border-color: rgba(234,179,8,0.6); box-shadow: 0 8px 20px rgba(234,179,8,0.08); }
.toast.bad{  border-color: rgba(244,63,94,0.6); box-shadow: 0 8px 20px rgba(244,63,94,0.08); }
.toast .msg{ display:inline-block; vertical-align: middle; }
.toast .icon{ margin-right: 8px; opacity: 0.8; }
.toast.hide{ animation: toast-out 180ms ease forwards; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes toast-out {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-6px); }
}

/* Mobile (coarse pointer): move toasts to bottom-center above controls */
@media (pointer: coarse){
  .toasts{
    top: auto;
    right: auto;
    left: 50%;
    bottom: calc(96px + env(safe-area-inset-bottom));
    transform: translateX(-50%);
    align-items: center;
  }
}