:root {
  --bg: #0b1030;
  --bg2: #141a4a;
  --card: #1c2358;
  --ink: #eef1ff;
  --muted: #9aa3d8;
  --you: #ffcc3f;
  --you-ink: #3a2a00;
  --opp: #4fd0ff;
  --primary: #ff5a3c;
  --primary2: #ff8a3c;
  --ok: #37e0a0;
  --err: #ff5670;
  --radius: 20px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Heebo', system-ui, sans-serif;
  background:
    radial-gradient(1200px 600px at 50% -10%, #23306e 0%, transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, #070a20 100%);
  color: var(--ink);
  overflow: hidden;
  overscroll-behavior: none;
  user-select: none;
}

/* ---------- screens ---------- */
.screen {
  position: fixed; inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 24px;
  padding-top: max(24px, env(safe-area-inset-top));
  padding-bottom: max(24px, env(safe-area-inset-bottom));
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .28s ease, transform .28s ease;
}
.screen.active { display: flex; opacity: 1; transform: none; }

/* ---------- home ---------- */
.hero { text-align: center; }
.hero-emoji { font-size: 56px; line-height: 1; animation: bob 2.4s ease-in-out infinite; }
.title {
  font-size: clamp(40px, 12vw, 72px);
  font-weight: 900;
  margin: 8px 0 4px;
  background: linear-gradient(90deg, var(--you), var(--primary2), var(--opp));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 4px 24px rgba(255,120,60,.25);
}
.subtitle { color: var(--muted); font-size: 18px; margin: 0; text-align: center; max-width: 22ch; }
.h2 { font-size: clamp(28px, 8vw, 40px); font-weight: 800; margin: 0; text-align: center; }
.muted { color: var(--muted); font-size: 16px; text-align: center; margin: 8px 0 0; }
.stack { display: flex; flex-direction: column; gap: 16px; width: 100%; max-width: 420px; }

/* ---------- buttons ---------- */
.btn {
  border: none; border-radius: var(--radius);
  font-family: inherit; font-weight: 800; font-size: 20px;
  min-height: 56px; padding: 0 24px;
  color: #fff; cursor: pointer;
  transition: transform .12s ease, box-shadow .2s ease, filter .2s ease;
  touch-action: manipulation;
}
.btn:active { transform: scale(.96); }
.btn-xl { min-height: 68px; font-size: 24px; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary2)); box-shadow: 0 10px 30px rgba(255,90,60,.4); }
.btn-secondary { background: linear-gradient(135deg, #3a46a8, #5866d8); box-shadow: 0 10px 30px rgba(70,90,220,.35); }
.btn-ghost { background: rgba(255,255,255,.08); color: var(--ink); font-weight: 600; min-height: 52px; }

.back {
  position: absolute; inset-block-start: max(16px, env(safe-area-inset-top)); inset-inline-start: 16px;
  width: 48px; height: 48px; border-radius: 50%;
  background: rgba(255,255,255,.08); color: var(--ink);
  border: none; font-size: 28px; font-weight: 800; cursor: pointer;
  display: grid; place-items: center;
}

/* ---------- collection tray ---------- */
.tray { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 15px; flex-wrap: wrap; justify-content: center; }
.tray-items { font-size: 26px; letter-spacing: 2px; }

/* ---------- join code ---------- */
.code-input { display: flex; gap: 12px; direction: ltr; }
.digit {
  width: 60px; height: 76px; border-radius: 16px;
  background: var(--card); border: 3px solid transparent;
  display: grid; place-items: center;
  font-size: 40px; font-weight: 900; color: var(--you);
}
.digit.filled { border-color: var(--you); }
.error-line { color: var(--err); font-weight: 700; margin: 0; min-height: 1.2em; }

/* ---------- keypad ---------- */
.keypad {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  width: 100%; max-width: 360px;
}
.key {
  min-height: 64px; border-radius: 18px; border: none;
  background: var(--card); color: var(--ink);
  font-family: inherit; font-size: 30px; font-weight: 800; cursor: pointer;
  transition: transform .1s ease, background .15s ease;
  touch-action: manipulation;
}
.key:active { transform: scale(.92); background: #262e6e; }
.key-ok { background: linear-gradient(135deg, var(--ok), #2bb389); color: #04231a; }
.key-del { background: #33305e; }

/* ---------- waiting ---------- */
.wait-wrap { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.big-code {
  direction: ltr; font-size: clamp(56px, 22vw, 110px); font-weight: 900;
  letter-spacing: 12px; color: var(--you);
  background: var(--card); border-radius: 24px; padding: 12px 28px;
  box-shadow: inset 0 0 0 3px rgba(255,204,63,.3), 0 12px 40px rgba(0,0,0,.4);
}
.spinner { display: flex; gap: 10px; margin-top: 8px; }
.spinner span { width: 14px; height: 14px; border-radius: 50%; background: var(--opp); animation: pulse 1s ease-in-out infinite; }
.spinner span:nth-child(2){ animation-delay: .15s; } .spinner span:nth-child(3){ animation-delay: .3s; }

/* ---------- race ---------- */
#screen-race { justify-content: flex-start; gap: 0; padding: 0; }
.track {
  position: relative; width: 100%; flex: 0 0 auto;
  padding: 16px 12px; padding-top: max(16px, env(safe-area-inset-top));
  background: linear-gradient(180deg, #0e1440, #0a0f30);
  border-bottom: 4px dashed rgba(255,255,255,.12);
  display: flex; flex-direction: column; gap: 14px;
}
.lane {
  position: relative; height: 58px; border-radius: 14px;
  background: repeating-linear-gradient(90deg, #12183f 0 34px, #161d4a 34px 40px);
  overflow: hidden;
}
.lane-you { box-shadow: inset 0 0 0 2px rgba(255,204,63,.25); }
.lane-opp { box-shadow: inset 0 0 0 2px rgba(79,208,255,.25); }
/* RTL track: finish is on the LEFT, cars start on the RIGHT and drive left via translateX(negative) */
.finish { position: absolute; inset-inline-start: 4px; top: 50%; transform: translateY(-50%); font-size: 26px; opacity: .8; }
.car {
  position: absolute; top: 50%; inset-inline-end: 6px;
  transform: translate(0, -50%);
  transition: transform .45s cubic-bezier(.22,.9,.3,1);
  will-change: transform;
  font-size: 34px; line-height: 1;
}
.car-emoji { display: inline-block; transform: scaleX(-1); } /* face the finish (left) */
.car.boost .car-emoji { animation: boost .45s ease; }
.lane-tag {
  position: absolute; inset-inline-end: 46px; top: 50%; transform: translateY(-50%);
  font-size: 13px; font-weight: 800; color: var(--muted);
  background: rgba(0,0,0,.35); padding: 2px 8px; border-radius: 8px; pointer-events: none;
}
.lane-you .lane-tag { color: var(--you); }
.lane-opp .lane-tag { color: var(--opp); }

.play {
  flex: 1 1 auto; width: 100%; max-width: 460px; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px; padding: 20px 16px; padding-bottom: max(20px, env(safe-area-inset-bottom));
}
.question { font-size: clamp(44px, 14vw, 76px); font-weight: 900; letter-spacing: 2px; direction: ltr; }
.answer {
  min-width: 160px; min-height: 64px; padding: 6px 24px;
  border-radius: 16px; background: var(--card);
  font-size: 46px; font-weight: 900; color: var(--you); direction: ltr;
  display: grid; place-items: center;
  box-shadow: inset 0 0 0 3px rgba(255,255,255,.06);
}
.answer.wrong { animation: shake .4s ease; color: var(--err); box-shadow: inset 0 0 0 3px var(--err); }
.answer.right { color: var(--ok); }

/* countdown overlay */
.countdown {
  position: fixed; inset: 0; z-index: 40;
  display: grid; place-items: center;
  background: rgba(6,9,26,.86); backdrop-filter: blur(4px);
}
.countdown span {
  font-size: 34vw; font-weight: 900; color: var(--you);
  animation: pop .8s ease;
}

/* ---------- finish ---------- */
.finish-wrap { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 20px; max-width: 420px; width: 100%; }
.finish-emoji { font-size: 84px; animation: bob 1.6s ease-in-out infinite; }
.finish-title { font-size: clamp(36px, 11vw, 60px); font-weight: 900; margin: 0; }
.finish-title.win { color: var(--you); }
.finish-title.lose { color: var(--opp); }
.unlock-card {
  background: linear-gradient(160deg, #2a2170, #43286e);
  border: 3px solid rgba(255,204,63,.5);
  border-radius: 24px; padding: 24px 28px; width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
  animation: reveal .6s cubic-bezier(.2,.9,.3,1.2) both;
}
.unlock-label { color: var(--you); font-weight: 800; font-size: 16px; letter-spacing: 1px; }
.unlock-emoji { font-size: 76px; margin: 8px 0; animation: pop .7s .2s both; }
.unlock-name { font-size: 26px; font-weight: 800; }

/* ---------- toast + confetti ---------- */
.toast {
  position: fixed; inset-block-start: max(16px, env(safe-area-inset-top)); inset-inline: 0;
  margin: 0 auto; width: fit-content; max-width: 90%;
  background: var(--card); color: var(--ink);
  padding: 12px 20px; border-radius: 14px; font-weight: 700;
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
  opacity: 0; transform: translateY(-12px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease; z-index: 60;
}
.toast.show { opacity: 1; transform: none; }
#confetti { position: fixed; inset: 0; z-index: 50; pointer-events: none; }

/* ---------- keyframes (transform + opacity only) ---------- */
@keyframes bob { 0%,100%{ transform: translateY(0);} 50%{ transform: translateY(-10px);} }
@keyframes pulse { 0%,100%{ transform: scale(.6); opacity:.5;} 50%{ transform: scale(1); opacity:1;} }
@keyframes shake { 0%,100%{transform:translateX(0);} 20%{transform:translateX(-8px);} 40%{transform:translateX(8px);} 60%{transform:translateX(-6px);} 80%{transform:translateX(6px);} }
@keyframes boost { 0%{transform:scaleX(-1) scale(1);} 40%{transform:scaleX(-1) scale(1.35);} 100%{transform:scaleX(-1) scale(1);} }
@keyframes pop { 0%{transform:scale(.3); opacity:0;} 60%{transform:scale(1.15); opacity:1;} 100%{transform:scale(1); opacity:1;} }
@keyframes reveal { 0%{transform:scale(.6) rotate(-6deg); opacity:0;} 100%{transform:scale(1) rotate(0); opacity:1;} }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; }
  .car { transition: none; }
}