* { box-sizing: border-box; }
:root {
  --bg: #0b0f1a;
  --panel: rgba(20, 24, 35, 0.9);
  --text: #e9eefc;
  --muted: #97a0b6;
  --primary: #4f8cff;
  --accent: #29d19c;
  --danger: #ff5d6c;
}
html, body {
  margin: 0;
  height: 100%;
  background: radial-gradient(1200px 1200px at 50% -10%, #172038, var(--bg));
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}
#app {
  position: relative;
  margin: 0 auto;
  max-width: 900px;
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
  justify-content: center;
  align-items: stretch;
}
#hud {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(11,15,26,0.95), rgba(11,15,26,0.2));
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-wrap: wrap;
}

/* Give the canvas a concrete CSS size so Resize logic can compute pixels */
#game {
  display: block;
  margin: 8px auto 16px auto;
  /* Canvas visible size (device pixels are handled by script.js with DPR) */
  width: min(92vw, 900px);
  height: calc(100vh - 160px); /* leave space for HUD */
  max-height: 1100px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.35);
  border-radius: 10px;
}
.spacer { flex: 1; }
.icon-btn {
  appearance: none;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}
.icon-btn:hover { filter: brightness(1.08); }
.icon-btn:active { transform: translateY(1px); }

.icon-btn[aria-pressed="true"] {
  background: rgba(79,140,255,0.18);
  border-color: rgba(79,140,255,0.4);
  box-shadow: 0 0 0 1px rgba(79,140,255,0.25), 0 0 10px rgba(79,140,255,0.15) inset;
}

.powerups { display: flex; align-items: center; gap: 10px; margin-right: 8px; }
.pu { display: flex; align-items: center; gap: 6px; color: var(--text); }
.pu-ico { font-size: 16px; }
.pu .bar { width: 80px; height: 8px; background: rgba(255,255,255,0.1); border-radius: 999px; overflow: hidden; }
.pu .bar > div { height: 100%; width: 0%; background: linear-gradient(90deg, var(--primary), #3a6dd6); }
.pu.pu-magnet .bar > div { background: linear-gradient(90deg, #ff7bf3, #b83ad6); }
.pu.pu-slow .bar > div { background: linear-gradient(90deg, #4ad2ff, #3a6dd6); }

.stat { display: flex; align-items: baseline; gap: 8px; }
.stat span { color: var(--muted); font-size: 14px; }
.stat strong { font-size: 20px; letter-spacing: 0.5px; }

#game {
  width: 100%;
  height: calc(100vh - 64px);
  display: block;
  border-radius: 12px;
  background: #0e111a;
  box-shadow: 0 10px 30px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(255,255,255,0.06);
}

/* Overlay */
.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: radial-gradient(1000px 1000px at 50% -20%, rgba(0,0,0,0.35), rgba(0,0,0,0.75));
  z-index: 4;
}
.panel {
  width: min(92vw, 520px);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.6);
}
.panel h1 { margin: 0 0 8px; font-size: 28px; }
.panel p { color: var(--muted); margin: 4px 0 12px; }
.panel .help { text-align: left; color: var(--muted); margin: 12px 0 18px; }
.panel .help li { margin: 6px 0; }
.hidden { display: none; }
.primary {
  appearance: none; cursor: pointer;
  background: linear-gradient(180deg, var(--primary), #3a6dd6);
  color: white; border: none; border-radius: 10px;
  font-size: 16px; font-weight: 600;
  padding: 12px 18px;
  box-shadow: 0 6px 16px rgba(79, 140, 255, 0.35);
}
.primary:hover { filter: brightness(1.05); }
.primary:active { transform: translateY(1px); }

/* Skins */
.skins { margin: 12px 0 16px; }
.skins h2 { font-size: 16px; margin: 0 0 10px; color: var(--muted); font-weight: 600; }
.skin-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.skin-option {
  appearance: none;
  border: 2px solid rgba(255,255,255,0.08);
  background: radial-gradient(180px 140px at 50% 20%, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border-radius: 14px;
  padding: 10px;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.03), 0 8px 20px rgba(0,0,0,0.35);
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease, filter 140ms ease;
  position: relative;
  overflow: hidden;
}
.skin-option:hover { transform: translateY(-3px); filter: brightness(1.02); }
.skin-option:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
.skin-option.selected,
.skin-option[aria-pressed="true"] {
  border-color: var(--primary);
  box-shadow: 0 12px 28px rgba(79, 140, 255, 0.28), inset 0 0 0 1px rgba(79, 140, 255, 0.28);
}
.skin-option img { 
  display: block; width: 100%; height: auto; pointer-events: none; 
  border-radius: 12px; 
  box-shadow: 0 10px 22px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(255,255,255,0.06);
}
/* Vector preview placeholder for skins */
.skin-preview {
  display: grid;
  place-items: center;
  width: 100%; height: 100px;
  border-radius: 12px;
  color: #e6e7ff;
  font-size: 36px;
  background: radial-gradient(180px 140px at 50% 20%, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  box-shadow: 0 10px 22px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(255,255,255,0.06);
}

/* glossy highlight */
.skin-option::before {
  content: '';
  position: absolute; inset: 0 0 auto 0; height: 45%;
  background: linear-gradient(180deg, rgba(255,255,255,0.18), rgba(255,255,255,0.02));
  mix-blend-mode: screen; pointer-events: none;
}

/* label chip using data-skin */
.skin-option::after {
  content: attr(data-skin);
  position: absolute; left: 50%; bottom: 8px; transform: translateX(-50%);
  padding: 2px 8px; border-radius: 999px;
  font-size: 11px; letter-spacing: 0.4px; text-transform: uppercase;
  color: #dfe9ff; background: rgba(12,16,28,0.8);
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 0 3px 10px rgba(0,0,0,0.35), 0 0 0 1px rgba(0,245,255,0.08) inset;
  pointer-events: none;
}

/* premium skins: star label */
.skin-option[data-skin="urban_taxi"]::after { content: '★ Urban Taxi'; }
.skin-option[data-skin="vaporwave"]::after { content: '★ Vaporwave'; }

/* Settings dropdown (HUD) */
.settings-menu { 
  position: absolute;
  top: 52px;
  right: 12px;
  background: linear-gradient(180deg, rgba(16,18,28,0.98), rgba(12,14,22,0.98));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,255,255,0.06) inset;
  padding: 12px 14px;
  width: clamp(280px, 48vw, 560px);
  z-index: 1000;
  backdrop-filter: blur(6px) saturate(120%);
}
.settings-menu.hidden { display: none; }
.settings-content { display: grid; gap: 12px; grid-template-columns: 1fr; }
.settings-group { 
  padding: 10px; 
  border-radius: 10px; 
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.06);
}
.settings-group h3 { 
  margin: 0 0 8px 0; 
  font-size: 0.95rem; 
  color: #cfe7ff; 
  text-shadow: 0 0 6px rgba(0, 245, 255, 0.4);
}
.settings-group .icon-btn, .settings-group .hud-label { margin: 4px 6px; }
.settings-group .hud-label input[type="range"] { width: 160px; }

/* Neon accents for synthwave vibe */
.icon-btn#settingsBtn { 
  box-shadow: 0 0 0 1px rgba(0,255,255,0.12) inset;
}
.icon-btn#settingsBtn[aria-expanded="true"] {
  background: radial-gradient(120% 120% at 50% 0%, rgba(0,255,255,0.15), rgba(255,0,200,0.12));
  box-shadow: 0 0 18px rgba(0,255,255,0.25), 0 0 12px rgba(255,0,200,0.2) inset;
}

/* Garage / Boutique */
.upgrade-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 12px;
}
.upgrade-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
}
.upgrade-item .info h3 { margin: 0 0 4px; }
.upgrade-item .info p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.upgrade-item .level { display: inline-block; margin-top: 6px; color: #cfe7ff; }
.buy-btn .price { font-weight: 700; margin: 0 4px; }
.buy-btn[disabled] { filter: grayscale(0.5); opacity: 0.6; cursor: not-allowed; }

/* Toasts */
#toasts {
  position: fixed;
  top: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 2000;
}
.toast {
  min-width: 220px;
  max-width: 360px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(16, 22, 32, 0.92);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text);
  box-shadow: 0 10px 24px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(255,255,255,0.03);
  opacity: 0;
  transform: translateY(-6px);
  animation: toast-in 220ms ease forwards;
}
.toast.success { border-color: rgba(41,209,156,0.4); box-shadow: 0 0 0 1px rgba(41,209,156,0.2) inset; }
.toast.warn { border-color: rgba(255,170,42,0.4); box-shadow: 0 0 0 1px rgba(255,170,42,0.2) inset; }
.toast.error { border-color: rgba(255,93,108,0.45); box-shadow: 0 0 0 1px rgba(255,93,108,0.2) inset; }
@keyframes toast-in {
  to { opacity: 1; transform: translateY(0); }
}

/* Skins: locked/selected visuals */
.skin-grid .skin-option {
  position: relative;
  border-radius: 10px;
  transition: transform 120ms ease, box-shadow 120ms ease, filter 120ms ease;
}
.skin-grid .skin-option.selected {
  box-shadow: 0 0 0 2px rgba(0,245,255,0.5), 0 0 18px rgba(0,245,255,0.2);
}
.skin-grid .skin-option.locked {
  filter: grayscale(0.8) brightness(0.8);
}
.skin-grid .skin-option.locked::after {
  content: '🔒';
  position: absolute;
  top: 6px; right: 6px;
  font-size: 16px;
  text-shadow: 0 2px 6px rgba(0,0,0,0.6);
}

/* Cosmetics small buttons (paints etc.) */
.icon-btn[aria-pressed="true"] {
  box-shadow: 0 0 0 2px rgba(0,245,255,0.5);
}
.icon-btn.locked {
  filter: grayscale(0.7) opacity(0.7);
}
.icon-btn.locked::after {
  content: ' 🔒';
}

/* Difficulty */
.difficulty { margin: 12px 0 16px; }
.difficulty h2 { font-size: 16px; margin: 0 0 10px; color: var(--muted); font-weight: 600; }
.difficulty-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.difficulty-option {
  appearance: none;
  border: 2px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, border-color 120ms ease;
}
.difficulty-option:hover { transform: translateY(-2px); }
.difficulty-option:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
.difficulty-option[aria-pressed="true"] {
  border-color: var(--primary);
  box-shadow: 0 6px 16px rgba(79, 140, 255, 0.25), inset 0 0 0 1px rgba(79, 140, 255, 0.25);
}

/* Initials / Highscores */
.initials-entry { margin: 10px 0 16px; }
.initials-row { display: flex; gap: 10px; justify-content: center; }
#initialsInput {
  width: 90px;
  text-transform: uppercase;
  text-align: center;
  font-size: 18px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.05);
  color: var(--text);
}
#initialsInput::placeholder { color: rgba(255,255,255,0.35); }
.scores-list { text-align: left; margin: 10px auto 16px; width: min(360px, 80%); }
.scores-list li { padding: 6px 8px; display: flex; justify-content: space-between; border-bottom: 1px dashed rgba(255,255,255,0.08); }
.scores-list li strong { letter-spacing: 0.5px; }

/* Touch zones */
#touchZones { position: fixed; inset: 0; z-index: 2; pointer-events: none; }
#leftZone, #rightZone {
  position: absolute; top: 0; bottom: 0; width: 50%;
  pointer-events: auto;
}
#leftZone { left: 0; }
#rightZone { right: 0; }

@media (max-width: 600px) {
  #hud { justify-content: space-between; padding: 8px 10px; }
  .panel h1 { font-size: 22px; }
}