/* Math Sprint Arcade — original geometric arcade look. No stock photos. */
:root {
  --bg: #120a2e;
  --bg-2: #1a1040;
  --panel: #24165a;
  --ink: #f4f0ff;
  --muted: #b7a8e6;
  --accent: #ff4fd8;
  --accent-2: #47f0c8;
  --gold: #ffd166;
  --danger: #ff6b8a;
  --ok: #6dffb0;
  --line: rgba(255, 255, 255, 0.12);
  --radius: 18px;
  --tap: 44px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(255, 79, 216, 0.28), transparent 60%),
    radial-gradient(700px 380px at 100% 0%, rgba(71, 240, 200, 0.18), transparent 55%),
    linear-gradient(160deg, var(--bg), var(--bg-2) 55%, #0c0720);
}

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--gold); color: #1a1040; padding: 0.6rem 1rem; z-index: 20;
}
.skip-link:focus { left: 0.75rem; top: 0.75rem; }

.topbar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.75rem; padding: 0.85rem 1.1rem; border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px); background: rgba(18, 10, 46, 0.72); position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; gap: 0.75rem; align-items: center; color: inherit; text-decoration: none; min-height: var(--tap); }
.brand strong { display: block; font-size: 1.05rem; }
.brand small { color: var(--muted); }
.logo-mark {
  width: 42px; height: 42px; border-radius: 12px;
  background:
    linear-gradient(135deg, var(--accent), #7a5cff 45%, var(--accent-2));
  box-shadow: inset 0 0 0 2px rgba(255,255,255,0.25);
}
.top-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.privacy-pill {
  display: inline-flex; align-items: center; min-height: 36px; padding: 0 0.75rem;
  border-radius: 999px; background: rgba(71, 240, 200, 0.12); color: var(--accent-2); font-size: 0.85rem;
}

main { width: min(980px, calc(100% - 1.5rem)); margin: 0 auto; padding: 1.25rem 0 3rem; }
.hero {
  display: grid; gap: 1.25rem; grid-template-columns: 1.2fr 0.8fr;
  padding: 1.25rem; border-radius: calc(var(--radius) + 6px);
  background: linear-gradient(145deg, rgba(36, 22, 90, 0.9), rgba(18, 10, 46, 0.65));
  border: 1px solid var(--line); box-shadow: var(--shadow); margin-bottom: 1.25rem;
}
.eyebrow {
  display: inline-block; letter-spacing: 0.08em; text-transform: uppercase;
  font-size: 0.72rem; color: var(--accent-2); font-weight: 700; margin-bottom: 0.4rem;
}
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.08; margin: 0 0 0.75rem; }
.hero h1 em { font-style: normal; color: var(--gold); }
.hero p { color: var(--muted); margin: 0 0 1rem; max-width: 36rem; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.hero-badges span {
  min-height: 36px; display: inline-flex; align-items: center; padding: 0 0.7rem;
  border-radius: 999px; background: rgba(255,255,255,0.06); border: 1px solid var(--line); font-size: 0.9rem;
}

.arcade-scene {
  position: relative; min-height: 180px; border-radius: var(--radius);
  background:
    repeating-linear-gradient(90deg, transparent, transparent 18px, rgba(255,255,255,0.03) 18px, rgba(255,255,255,0.03) 19px),
    linear-gradient(180deg, #2a1870, #140a38);
  overflow: hidden; border: 1px solid var(--line);
}
.geo { position: absolute; }
.hex {
  width: 78px; height: 78px; right: 18%; top: 22%;
  background: linear-gradient(135deg, var(--accent), #ff9a3c);
  clip-path: polygon(25% 6%, 75% 6%, 100% 50%, 75% 94%, 25% 94%, 0 50%);
  box-shadow: 0 0 30px rgba(255, 79, 216, 0.45);
}
.bolt {
  width: 0; height: 0; left: 18%; top: 30%;
  border-left: 18px solid transparent; border-right: 18px solid transparent; border-bottom: 42px solid var(--gold);
  filter: drop-shadow(0 0 12px rgba(255, 209, 102, 0.7));
}
.bolt::after {
  content: ""; position: absolute; left: -10px; top: 28px;
  border-left: 10px solid transparent; border-right: 10px solid transparent; border-top: 28px solid var(--accent-2);
}
.coin {
  width: 46px; height: 46px; border-radius: 50%; left: 55%; bottom: 18%;
  background: radial-gradient(circle at 30% 30%, #fff3b0, var(--gold) 45%, #c98a00);
  box-shadow: 0 0 0 3px rgba(255,209,102,0.25);
}
.bubble {
  position: absolute; left: 10%; bottom: 12%; padding: 0.45rem 0.7rem; border-radius: 999px;
  background: rgba(0,0,0,0.35); border: 1px solid var(--line); font-size: 0.82rem; color: var(--ink);
}

.play, .parent, .family-note, .buy {
  margin-bottom: 1.25rem; padding: 1.1rem; border-radius: var(--radius);
  background: rgba(36, 22, 90, 0.72); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.hud {
  display: grid; gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin-bottom: 1rem; align-items: end;
}
.hud h2 { margin: 0; font-size: 1.25rem; }
.level-picker { display: grid; gap: 0.35rem; color: var(--muted); font-size: 0.85rem; min-width: 0; }
.level-picker select {
  min-height: var(--tap); border-radius: 12px; border: 1px solid var(--line);
  background: #160c3a; color: var(--ink); padding: 0 0.75rem; font-size: 1rem;
  width: 100%; max-width: 100%; min-width: 0;
}
.score-card {
  display: flex; gap: 0.55rem; align-items: center; min-height: var(--tap);
  padding: 0.55rem 0.7rem; border-radius: 14px; background: rgba(255,255,255,0.05); border: 1px solid var(--line);
}
.score-card strong { display: block; font-size: 1.2rem; }
.score-card small { color: var(--muted); }
.timer-card { border-color: rgba(255, 209, 102, 0.35); }

.round-card { text-align: center; padding: 0.5rem 0 0; }
.prompt {
  font-size: clamp(2rem, 8vw, 3.4rem); font-weight: 800; letter-spacing: 0.04em;
  margin: 0.5rem 0 1rem; min-height: 1.2em; font-variant-numeric: tabular-nums;
}
.answer-label { display: block; color: var(--muted); margin-bottom: 0.35rem; }
.answer-input {
  width: min(220px, 100%); min-height: var(--tap); text-align: center; font-size: 1.5rem; font-weight: 700;
  border-radius: 14px; border: 2px solid rgba(71, 240, 200, 0.45); background: #10082c; color: var(--ink);
  margin-bottom: 0.75rem;
}
.answer-input:disabled { opacity: 0.55; }
.feedback { min-height: 1.4em; margin: 0 0 0.85rem; font-weight: 700; }
.feedback.ok { color: var(--ok); }
.feedback.bad { color: var(--danger); }
.row { display: flex; flex-wrap: wrap; gap: 0.55rem; justify-content: center; }
.session-line { margin-top: 0.85rem; }

.button {
  min-height: var(--tap); min-width: var(--tap); padding: 0 1rem; border-radius: 14px;
  border: 1px solid var(--line); background: rgba(255,255,255,0.08); color: var(--ink);
  font-size: 1rem; font-weight: 700; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem;
}
.button:disabled { opacity: 0.45; cursor: not-allowed; }
.button-primary {
  background: linear-gradient(135deg, var(--accent), #7a5cff);
  border-color: transparent; box-shadow: 0 8px 24px rgba(255, 79, 216, 0.28);
}
.button-soft { background: rgba(71, 240, 200, 0.12); border-color: rgba(71, 240, 200, 0.25); }

.section-title { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem; align-items: end; margin-bottom: 1rem; }
.section-title h2 { margin: 0; }
.parent-summary, .parent-sessions { display: grid; gap: 0.65rem; }
.parent-summary article, .parent-sessions article {
  padding: 0.85rem; border-radius: 14px; background: rgba(255,255,255,0.05); border: 1px solid var(--line);
}
.parent-summary strong, .parent-sessions strong { display: block; font-size: 1.15rem; }
.muted { color: var(--muted); font-size: 0.92rem; }

.family-note { display: flex; gap: 0.9rem; align-items: flex-start; }
.note-icon {
  width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(255,209,102,0.25), rgba(71,240,200,0.2)); font-size: 1.4rem; flex: 0 0 auto;
}
.family-note h2 { margin: 0 0 0.35rem; font-size: 1.15rem; }
.family-note p { margin: 0; color: var(--muted); }

.buy { text-align: center; }
.buy-disabled { opacity: 0.92; outline: 2px dashed rgba(255, 209, 102, 0.35); }
.buy-kicker { letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-size: 0.75rem; }
.buy-price { font-size: 1.8rem; font-weight: 800; margin: 0.35rem 0; }
.proposed-tag {
  display: inline-block; margin-left: 0.35rem; padding: 0.15rem 0.5rem; border-radius: 999px;
  font-size: 0.7rem; vertical-align: middle; background: rgba(255,209,102,0.2); color: var(--gold);
}
.buy-copy { color: var(--muted); }
.buy-row { display: flex; flex-wrap: wrap; gap: 0.55rem; justify-content: center; margin: 0.85rem 0; }
.buy-note { color: var(--muted); font-size: 0.88rem; }
.buy-note a { color: var(--accent-2); }

.modal {
  border: 1px solid var(--line); border-radius: 18px; padding: 1.25rem; width: min(420px, calc(100% - 1.5rem));
  background: #1a1040; color: var(--ink); box-shadow: var(--shadow);
}
.modal::backdrop { background: rgba(6, 2, 20, 0.72); }
.modal form { display: grid; gap: 0.65rem; }
.modal label { display: grid; gap: 0.3rem; text-align: left; color: var(--muted); font-size: 0.9rem; }
.modal input {
  min-height: var(--tap); border-radius: 12px; border: 1px solid var(--line);
  background: #120a2e; color: var(--ink); padding: 0 0.75rem; font-size: 1rem;
}
.form-error { color: var(--danger); min-height: 1.2em; margin: 0; }

.foot { text-align: center; color: var(--muted); padding: 0 1rem 2rem; font-size: 0.85rem; }

@media (max-width: 720px) {
  .hero { grid-template-columns: 1fr; }
  .arcade-scene { min-height: 140px; }
}