:root {
  --bg: #EDEBE0;
  --text: rgba(0, 0, 0, 0.8);
  --secondary: rgba(60, 60, 67, 0.6);
  --board: rgb(89, 94, 102);
  --cell-color: rgb(107, 112, 120);
  --exit: rgb(77, 166, 89);
  --level-btn: rgb(89, 115, 153);
  --level-btn-locked: rgb(140, 140, 148);
  --win-card: rgb(51, 153, 89);
  --star: #FFCC00;
  --cell: 80px;               /* set by game.js from the viewport */
  --spacing: calc(var(--cell) * 0.06);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Rounded", "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.app {
  position: fixed;
  inset: 0;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 250ms ease-in-out;
}
.screen.is-leaving { opacity: 0; pointer-events: none; }
.screen.is-entering { opacity: 0; pointer-events: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  touch-action: manipulation;
}
button:disabled { cursor: default; }

.icon { display: inline-block; width: 1em; height: 1em; fill: currentColor; vertical-align: middle; }

/* ---- Menu ---- */
.menu { gap: 28px; padding: 40px; }
.menu__title { margin: 0; font-size: 52px; font-weight: 900; color: var(--text); }
.tier-card {
  display: flex; align-items: center; gap: 20px;
  width: min(560px, 100%); min-height: 84px; padding: 0 28px;
  border-radius: 24px; color: #fff;
}
.tier-card:disabled { opacity: 0.55; }
.tier-card__cars { display: flex; gap: 4px; width: 130px; font-size: 22px; }
.tier-card__name { font-size: 30px; font-weight: 700; flex: 1; text-align: left; }
.tier-card__stars { display: flex; align-items: center; gap: 6px; font-size: 22px; font-weight: 600; }
.tier-card__lock { font-size: 26px; }

/* ---- Level grid ---- */
.grid-screen { gap: 24px; padding: 36px; }
.grid-screen__inner { width: min(760px, 100%); display: flex; flex-direction: column; gap: 24px; }
.grid-screen__header { display: flex; align-items: center; justify-content: space-between; padding: 0 8px; }
.grid-screen__title { margin: 0; font-size: 36px; font-weight: 900; }
.icon-button { font-size: 44px; color: var(--secondary); line-height: 1; display: inline-flex; }
.icon-button:disabled { opacity: 0.35; }
.icon-button.is-hidden { visibility: hidden; }
.level-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.level-button {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  min-height: 96px; border-radius: 20px; background: var(--level-btn); color: #fff;
}
.level-button:disabled { background: var(--level-btn-locked); }
.level-button__number { font-size: 34px; font-weight: 900; }
.level-button__stars { display: flex; gap: 2px; font-size: 13px; color: var(--star); }
.level-button__stars .is-empty { opacity: 0.5; }
.level-button__lock { font-size: 30px; opacity: 0.7; }

/* ---- Game ---- */
.game { gap: 16px; }
.hud { display: flex; align-items: center; gap: 24px; color: var(--secondary); }
.hud__moves { display: flex; align-items: center; gap: 8px; font-size: 30px; font-weight: 700; }
.hud__moves .icon { font-size: 30px; }

.board-wrap { position: relative; width: calc(var(--cell) * 6); height: calc(var(--cell) * 6); }
.board {
  position: absolute; inset: 0;
  background: var(--board);
  border-radius: calc(var(--cell) * 0.15);
  touch-action: none;
  overflow: visible;
}
.board__cell {
  position: absolute;
  width: calc(var(--cell) - var(--spacing));
  height: calc(var(--cell) - var(--spacing));
  background: var(--cell-color);
  border-radius: calc(var(--cell) * 0.08);
}
.board__exit {
  position: absolute;
  left: calc(var(--cell) * 6 + 4px);
  top: calc(var(--cell) * 2);
  width: calc(var(--cell) * 0.6);
  height: var(--cell);
  display: flex; align-items: center; justify-content: center;
  color: var(--exit);
  font-size: calc(var(--cell) * 0.4);
}
.vehicle {
  position: absolute;
  left: 0; top: 0;
  display: block;
  border-radius: calc(var(--cell) * 0.22);
  transition: transform 250ms cubic-bezier(0.2, 0.8, 0.3, 1.1), opacity 700ms ease-in;
  will-change: transform;
  -webkit-user-drag: none;
  touch-action: none;
}
.vehicle.is-dragging { transition: none; z-index: 2; }
.board.no-anim .vehicle { transition: none; }
.vehicle.is-exiting { transition: transform 700ms ease-in, opacity 700ms ease-in; opacity: 0; }

/* ---- Win overlay ---- */
.win {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0; transition: opacity 250ms;
}
.win.is-visible { opacity: 1; }
.win__card {
  display: flex; flex-direction: column; align-items: center; gap: 20px;
  padding: 48px; border-radius: 32px; background: var(--win-card); color: #fff;
  transform: scale(0.7); transition: transform 350ms cubic-bezier(0.2, 0.8, 0.3, 1.15);
}
.win.is-visible .win__card { transform: scale(1); }
.win__stars { display: flex; gap: 12px; font-size: 56px; color: var(--star); }
.win__stars .icon { transform: scale(0.2); transition: transform 400ms cubic-bezier(0.2, 0.9, 0.3, 1.4); }
.win.is-visible .win__stars .icon { transform: scale(1); }
.win.is-visible .win__stars .icon:nth-child(2) { transition-delay: 150ms; }
.win.is-visible .win__stars .icon:nth-child(3) { transition-delay: 300ms; }
.win__text { margin: 0; font-size: 44px; font-weight: 900; }
.win__next { font-size: 64px; color: #fff; line-height: 1; display: inline-flex; }

@media (max-width: 600px) {
  .menu__title { font-size: 40px; }
  .tier-card__name { font-size: 24px; }
  .tier-card__cars { width: 96px; font-size: 18px; }
  .grid-screen { padding: 16px; }
  .level-grid { gap: 10px; }
  .level-button { min-height: 64px; }
  .level-button__number { font-size: 24px; }
  .win__card { padding: 28px; }
  .win__text { font-size: 32px; }
}