:root {
  --bg-1: #f3eeff;
  --bg-2: #ffe9f3;
  --surface: #ffffff;
  --surface-2: #f6f2ff;
  --ink: #2a2350;
  --ink-soft: #6c6494;
  --grid: #d6cdf5;
  --x-color: #ff5d8f;
  --o-color: #3aa0ff;
  --win: #27c281;
  --primary: #7a5cff;
  --primary-ink: #ffffff;
  --shadow: 0 18px 40px -18px rgba(80, 50, 160, 0.45);
  --ring: rgba(122, 92, 255, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-1: #161228;
    --bg-2: #221634;
    --surface: #211b3a;
    --surface-2: #2a2350;
    --ink: #f1edff;
    --ink-soft: #ada5d6;
    --grid: #4a3f78;
    --x-color: #ff7aa6;
    --o-color: #5cb6ff;
    --win: #3ad99a;
    --primary: #8d72ff;
    --shadow: 0 18px 44px -18px rgba(0, 0, 0, 0.6);
    --ring: rgba(141, 114, 255, 0.45);
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  font-family: 'Fredoka', 'Baloo 2', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(120% 90% at 15% 0%, var(--bg-2), transparent 55%),
    radial-gradient(120% 90% at 100% 100%, var(--bg-2), transparent 50%),
    var(--bg-1);
  min-height: 100%;
  display: flex;
  flex-direction: column;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

.back-link {
  position: fixed;
  top: max(14px, env(safe-area-inset-top));
  left: 16px;
  z-index: 10;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink-soft);
  background: var(--surface);
  padding: 8px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, color .15s ease;
}
.back-link:hover { color: var(--ink); transform: translateY(-1px); }

.shell {
  flex: 1;
  display: grid;
  place-items: center;
  padding: max(72px, calc(env(safe-area-inset-top) + 58px)) 18px 32px;
}

.screen {
  width: 100%;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* ---------- Start screen ---------- */
.logo {
  font-weight: 800;
  font-size: 64px;
  line-height: 1;
  letter-spacing: 2px;
  display: flex;
  gap: 6px;
}
.logo .mark-x { color: var(--x-color); transform: rotate(-8deg); }
.logo .mark-o { color: var(--o-color); transform: rotate(8deg); }

.title {
  font-family: 'Baloo 2', 'Fredoka', system-ui, sans-serif;
  font-weight: 800;
  font-size: clamp(38px, 9vw, 58px);
  margin: 10px 0 4px;
  letter-spacing: -0.5px;
}
.subtitle {
  margin: 0 0 22px;
  color: var(--ink-soft);
  font-size: 17px;
  font-weight: 500;
}

.panel {
  width: 100%;
  background: var(--surface);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 22px;
}

.field { display: flex; flex-direction: column; gap: 10px; align-items: center; }
.field-label {
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.seg {
  display: inline-flex;
  background: var(--surface-2);
  border-radius: 999px;
  padding: 5px;
  gap: 4px;
}
.seg-btn {
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-family: inherit;
  font-weight: 600;
  font-size: 16px;
  padding: 10px 20px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, transform .12s ease;
}
.seg-btn small { font-weight: 500; opacity: .8; font-size: 12px; }
.seg-btn:hover { color: var(--ink); }
.seg-btn.active {
  background: var(--primary);
  color: var(--primary-ink);
  box-shadow: 0 6px 16px -6px var(--ring);
}
.seg-btn:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; }

.hint {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
  max-width: 320px;
}

.btn {
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  border: 0;
  border-radius: 999px;
  transition: transform .12s ease, box-shadow .18s ease, background .18s ease;
}
.btn:focus-visible { outline: 3px solid var(--ring); outline-offset: 3px; }
.btn-primary {
  background: var(--primary);
  color: var(--primary-ink);
  font-size: 20px;
  padding: 15px 46px;
  box-shadow: 0 14px 30px -10px var(--ring);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
}
.btn-ghost:hover { transform: translateY(-1px); }
.btn-sm { font-size: 14px; padding: 9px 14px; min-height: 44px; }

.record, .scoreboard { display: flex; gap: 14px; }
.record { margin-top: 24px; }
.rec {
  background: var(--surface);
  border-radius: 18px;
  padding: 12px 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-width: 78px;
}
.rec-n { font-weight: 800; font-size: 26px; line-height: 1; }
.rec-l { font-size: 13px; color: var(--ink-soft); margin-top: 4px; font-weight: 500; }
.rec:nth-child(1) .rec-n { color: var(--win); }
.rec:nth-child(2) .rec-n { color: var(--x-color); }
.rec:nth-child(3) .rec-n { color: var(--o-color); }

/* ---------- Play area ---------- */
.play { gap: 16px; }
.topbar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.scoreboard {
  gap: 6px;
  background: var(--surface);
  border-radius: 16px;
  padding: 7px 12px;
  box-shadow: var(--shadow);
}
.sc { display: flex; flex-direction: column; align-items: center; min-width: 34px; }
.sc-n { font-weight: 800; font-size: 19px; line-height: 1; }
.sc-l { font-size: 11px; color: var(--ink-soft); font-weight: 600; }
.sc:nth-child(1) .sc-n { color: var(--win); }
.sc:nth-child(2) .sc-n { color: var(--x-color); }
.sc:nth-child(3) .sc-n { color: var(--o-color); }

.board-wrap {
  width: 100%;
  display: grid;
  place-items: center;
}
#game {
  background: var(--surface);
  border-radius: 28px;
  box-shadow: var(--shadow);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
}

.status {
  font-weight: 600;
  font-size: 19px;
  min-height: 26px;
  margin: 2px 0;
  color: var(--ink);
  transition: color .2s ease;
}
.status.you { color: var(--ink); }
.status.win { color: var(--win); }
.status.loss { color: var(--ink-soft); }
.status.draw { color: var(--o-color); }

@media (max-width: 420px) {
  .seg-btn { padding: 9px 14px; font-size: 15px; }
  .seg-btn small { display: none; }
  .rec { padding: 10px 16px; min-width: 64px; }
}

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