body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px clamp(20px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
}

.game-brand {
  font-size: 1.4rem;
}

.game-header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.game-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
}

.game-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(28px, 5vw, 48px);
  padding: clamp(36px, 7vw, 72px) 20px clamp(48px, 8vw, 88px);
}

.game-hero {
  max-width: 540px;
  text-align: center;
  display: grid;
  gap: 10px;
}

.game-kicker {
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 700;
}

.game-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 3rem);
  color: var(--ink);
}

.game-lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.6;
}

.ttt-wrap {
  width: 100%;
  max-width: 420px;
  display: grid;
  gap: 22px;
  justify-items: center;
}

.ttt-scoreboard {
  display: flex;
  width: 100%;
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--skeu-highlight), var(--skeu-shadow-sm);
  overflow: hidden;
}

.ttt-score-item {
  flex: 1;
  display: grid;
  gap: 2px;
  justify-items: center;
  padding: 14px 8px;
  border-right: 1px solid var(--glass-border);
}

.ttt-score-item:last-child {
  border-right: none;
}

.ttt-score-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--ink);
  line-height: 1;
}

.ttt-score-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 700;
}

.ttt-board {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 8px;
  padding: 10px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--skeu-highlight), var(--skeu-shadow-lg);
}

.ttt-cell {
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  font-family: "Playfair Display", serif;
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
  box-shadow: var(--skeu-highlight);
}

.ttt-cell:not(:disabled):hover {
  transform: translateY(-2px);
  border-color: #9db7e5;
  box-shadow: var(--skeu-highlight), 0 10px 18px rgba(15, 23, 42, 0.1);
}

.ttt-cell:disabled {
  cursor: default;
}

.ttt-cell.is-x {
  color: #1d4ed8;
}

.ttt-cell.is-o {
  color: #be123c;
}

.ttt-win-line {
  position: absolute;
  inset: 10px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease;
}

.ttt-win-line.is-visible {
  opacity: 1;
}

.ttt-win-line line {
  stroke: #16a34a;
  stroke-width: 6;
  stroke-linecap: round;
}

.ttt-status {
  margin: 0;
  min-height: 1.4em;
  color: var(--text);
  font-weight: 600;
  text-align: center;
}

.ttt-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
}

.ttt-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  cursor: pointer;
}

.ttt-toggle input {
  width: 16px;
  height: 16px;
  accent-color: #1d4ed8;
}

.ttt-leaderboard {
  width: 100%;
  max-width: 420px;
  display: grid;
  gap: 16px;
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--skeu-highlight), var(--skeu-shadow-sm);
  padding: clamp(16px, 3vw, 22px);
}

.ttt-leaderboard-head h2 {
  margin: 0 0 4px;
  font-size: 1.25rem;
  color: var(--ink);
}

.ttt-leaderboard-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.ttt-streak-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 14px;
  background: var(--surface);
}

.ttt-streak-label {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.ttt-streak-value {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--ink);
}

.ttt-save-form {
  display: flex;
  gap: 10px;
}

.ttt-save-form input {
  flex: 1;
  min-width: 0;
  border-radius: 12px;
  border: 1px solid rgba(203, 213, 225, 0.9);
  background: rgba(255, 255, 255, 0.95);
  padding: 0.62rem 0.8rem;
  font-family: inherit;
  font-size: 0.92rem;
  color: #0f172a;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.ttt-save-form input:focus {
  border-color: rgba(147, 197, 253, 0.95);
  box-shadow: 0 0 0 4px rgba(147, 197, 253, 0.25);
}

.ttt-save-note {
  margin: 0;
  min-height: 1.2em;
  font-size: 0.85rem;
  color: var(--muted);
}

.ttt-leaderboard-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.ttt-leaderboard-row {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.ttt-leaderboard-rank {
  font-weight: 800;
  color: var(--muted);
  font-size: 0.85rem;
}

.ttt-leaderboard-name {
  font-weight: 700;
  color: var(--ink);
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ttt-leaderboard-streak {
  font-weight: 800;
  color: #1d4ed8;
  font-size: 0.95rem;
}

.ttt-leaderboard-empty {
  list-style: none;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
  padding: 10px 0;
}

html[data-theme="dark"] .ttt-save-form input {
  border-color: rgba(148, 163, 184, 0.22);
  background: rgba(3, 6, 12, 0.6);
  color: rgba(248, 250, 252, 0.92);
}

html[data-theme="dark"] .ttt-leaderboard-streak {
  color: #60a5fa;
}

.game-footer {
  text-align: center;
  padding: 20px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
}

.game-footer p {
  margin: 0;
}

html[data-theme="dark"] .ttt-cell {
  background: rgba(3, 6, 12, 0.55);
  border-color: rgba(148, 163, 184, 0.22);
}

html[data-theme="dark"] .ttt-cell.is-x {
  color: #60a5fa;
}

html[data-theme="dark"] .ttt-cell.is-o {
  color: #fb7185;
}

@media (max-width: 480px) {
  .game-header {
    flex-wrap: wrap;
  }
}