/* ==========================================================================
   终极井字棋 · 样式
   ========================================================================== */

.uttt {
  --x: #38bdf8;
  --o: #fb7185;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

/* ------------------------------ 状态栏 ---------------------------------- */

.uttt-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(94vw, 620px);
  padding: 14px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--surface);
}

.uttt-turn { display: flex; align-items: center; gap: 12px; min-width: 0; }

.uttt-turn-symbol {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-size: 19px;
  font-weight: 800;
  border-radius: 12px;
  flex: 0 0 auto;
  transition: color .25s, background .25s, box-shadow .25s;
}
.uttt-turn-symbol.is-x { color: var(--x); background: rgba(56, 189, 248, 0.14); box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.35); }
.uttt-turn-symbol.is-o { color: var(--o); background: rgba(251, 113, 133, 0.14); box-shadow: 0 0 0 1px rgba(251, 113, 133, 0.35); }

.uttt-turn-text {
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--text-dim);
}

.uttt-score { display: flex; gap: 8px; flex: 0 0 auto; }

.uttt-score-item {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-soft);
}
.uttt-score-item b { font-size: 15px; }
.uttt-score-item.is-x { color: var(--x); }
.uttt-score-item.is-o { color: var(--o); }

/* ------------------------------ 结果横幅 -------------------------------- */

.uttt-banner {
  width: min(94vw, 620px);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2);
  text-align: center;
  animation: uttt-pop .35s cubic-bezier(.2, .8, .3, 1);
}
.uttt-banner.is-x { border-color: rgba(56, 189, 248, 0.5); background: linear-gradient(120deg, rgba(56, 189, 248, 0.18), rgba(56, 189, 248, 0.05)); }
.uttt-banner.is-o { border-color: rgba(251, 113, 133, 0.5); background: linear-gradient(120deg, rgba(251, 113, 133, 0.18), rgba(251, 113, 133, 0.05)); }
.uttt-banner.is-draw { border-color: rgba(148, 163, 184, 0.45); background: linear-gradient(120deg, rgba(148, 163, 184, 0.16), rgba(148, 163, 184, 0.05)); }

.uttt-banner-title { font-size: 19px; font-weight: 700; margin-bottom: 5px; }
.uttt-banner.is-x .uttt-banner-title { color: var(--x); }
.uttt-banner.is-o .uttt-banner-title { color: var(--o); }
.uttt-banner-detail { font-size: 12.5px; color: var(--text-dim); }

@keyframes uttt-pop {
  from { opacity: 0; transform: translateY(-8px) scale(.98); }
  to { opacity: 1; transform: none; }
}

/* -------------------------------- 棋盘 ---------------------------------- */

.uttt-board-wrap { display: grid; place-items: center; }

.uttt-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: min(94vw, 620px);
  padding: 14px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.015));
  box-shadow: var(--shadow-lg);
}

.uttt-sub {
  position: relative;
  padding: 6px;
  border-radius: 15px;
  border: 1px solid var(--border-soft);
  background: rgba(6, 9, 20, 0.62);
  transition: border-color .25s, box-shadow .25s, background .25s, opacity .25s;
}

.uttt-sub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}

.uttt-sub.is-active {
  border-color: rgba(139, 92, 246, 0.85);
  box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.28), 0 0 34px -8px rgba(139, 92, 246, 0.75);
}
.uttt-sub.is-dim { opacity: 0.5; }

.uttt-sub.captured-x { background: rgba(56, 189, 248, 0.09); border-color: rgba(56, 189, 248, 0.32); }
.uttt-sub.captured-o { background: rgba(251, 113, 133, 0.09); border-color: rgba(251, 113, 133, 0.32); }

.uttt-sub.is-win {
  border-color: rgba(52, 211, 153, 0.85);
  box-shadow: 0 0 0 2px rgba(52, 211, 153, 0.3), 0 0 34px -8px rgba(52, 211, 153, 0.8);
}

/* -------------------------------- 格子 ---------------------------------- */

.uttt-cell {
  display: grid;
  place-items: center;
  aspect-ratio: 1 / 1;
  width: 100%;
  padding: 0;
  font-family: inherit;
  font-size: clamp(15px, 2.7vw, 25px);
  font-weight: 800;
  line-height: 1;
  color: var(--text);
  border: none;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.045);
  cursor: default;
  transition: background .18s, transform .18s, color .18s, box-shadow .18s;
}

.uttt-cell.can-play {
  cursor: pointer;
  background: rgba(139, 92, 246, 0.13);
  box-shadow: inset 0 0 0 1px rgba(139, 92, 246, 0.3);
}
.uttt-cell.can-play:hover {
  background: rgba(139, 92, 246, 0.32);
  transform: translateY(-2px);
}
.uttt-cell.can-play:active { transform: translateY(0) scale(.96); }

.uttt-cell.is-x { color: var(--x); text-shadow: 0 0 16px rgba(56, 189, 248, 0.6); }
.uttt-cell.is-o { color: var(--o); text-shadow: 0 0 16px rgba(251, 113, 133, 0.6); }

.uttt-cell.is-win {
  background: rgba(52, 211, 153, 0.22);
  box-shadow: inset 0 0 0 1px rgba(52, 211, 153, 0.6);
}

/* 小棋盘被占领后的大号标记 */
.uttt-sub-mark {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(42px, 9vw, 82px);
  font-weight: 900;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transition: opacity .28s;
}
.uttt-sub-mark.is-x { color: var(--x); text-shadow: 0 0 30px rgba(56, 189, 248, 0.75); }
.uttt-sub-mark.is-o { color: var(--o); text-shadow: 0 0 30px rgba(251, 113, 133, 0.75); }
.uttt-sub.captured .uttt-sub-mark { opacity: 0.9; }

/* 已占领但仍可继续落子（自定义规则开启）时，弱化标记避免遮挡 */
.uttt-sub.captured.is-open .uttt-sub-mark {
  opacity: 0.24;
  font-size: clamp(24px, 4.6vw, 42px);
}

/* ------------------------------- 控制区 --------------------------------- */

.uttt-controls { display: flex; gap: 12px; }

.uttt-rule {
  display: flex;
  align-items: center;
  gap: 14px;
  width: min(94vw, 620px);
  padding: 14px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--surface);
}
.uttt-rule-text { display: flex; flex-direction: column; gap: 2px; }
.uttt-rule-text b { font-size: 13.5px; font-weight: 600; }
.uttt-rule-text small { font-size: 12px; color: var(--text-mute); }

.uttt-rules { width: min(94vw, 620px); margin-top: 0; }

/* ==========================================================================
   模式切换 / 房间模式
   ========================================================================== */

.uttt-app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.mode-tabs {
  display: flex;
  gap: 8px;
  padding: 6px;
  width: min(94vw, 620px);
  border-radius: 16px;
  border: 1px solid var(--border-soft);
  background: var(--surface);
}

.mode-tab {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 11px 15px;
  font-family: inherit;
  text-align: left;
  color: var(--text-dim);
  border: none;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
  transition: color .2s, background .2s, box-shadow .2s;
}
.mode-tab b { font-size: 14px; color: inherit; }
.mode-tab small { font-size: 11.5px; color: var(--text-mute); }
.mode-tab:hover { color: var(--text); background: var(--surface-2); }
.mode-tab.is-active {
  color: #0a0e1a;
  background: linear-gradient(120deg, #a78bfa, #22d3ee);
  box-shadow: 0 14px 30px -18px rgba(139, 92, 246, 0.95);
}
.mode-tab.is-active small { color: rgba(10, 14, 26, 0.7); }

.mode-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

/* 状态栏 / 控制区之外的插槽 */
.uttt-slot { width: min(94vw, 620px); }
.uttt-slot:empty { display: none; }

/* ------------------------------- 大厅 ----------------------------------- */

.room-lobby { width: min(94vw, 620px); }
.room-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.room-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
}
.room-card h3 { margin: 0; font-size: 16px; }
.room-card p { margin: 0; font-size: 13px; line-height: 1.6; color: var(--text-dim); }
.room-card .btn { margin-top: 4px; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field > span { font-size: 12.5px; color: var(--text-mute); }
.field input {
  width: 100%;
  padding: 11px 14px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(6, 9, 20, 0.6);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.field input::placeholder { color: var(--text-mute); }
.field input:focus { border-color: rgba(139, 92, 246, 0.75); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.18); }

.room-alert {
  margin-bottom: 14px;
  padding: 12px 16px;
  font-size: 13px;
  border-radius: 12px;
  color: #fde68a;
  border: 1px solid rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.1);
}

/* ----------------------------- 房间信息条 ------------------------------- */

.room-bar {
  display: flex;
  align-items: stretch;
  gap: 12px;
  width: 100%;
}

.room-code {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 12px 18px;
  border-radius: var(--radius);
  border: 1px solid rgba(139, 92, 246, 0.42);
  background: rgba(139, 92, 246, 0.12);
  flex: 0 0 auto;
}
.room-code-label { font-size: 11px; color: var(--text-mute); letter-spacing: 0.1em; }
.room-code-value {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.12em;
  font-variant-numeric: tabular-nums;
}

.btn-mini { padding: 5px 11px; font-size: 11.5px; border-radius: 8px; }

.room-seats { display: flex; flex-direction: column; gap: 8px; flex: 1 1 auto; min-width: 0; }

.room-seat {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-soft);
  background: var(--surface);
}
.room-seat-mark {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  font-size: 13px;
  font-weight: 800;
  border-radius: 8px;
  flex: 0 0 auto;
}
.room-seat.is-x .room-seat-mark { color: var(--x); background: rgba(56, 189, 248, 0.14); }
.room-seat.is-o .room-seat-mark { color: var(--o); background: rgba(251, 113, 133, 0.14); }
.room-seat-info { display: flex; flex-direction: column; line-height: 1.35; min-width: 0; }
.room-seat-info b { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.room-seat-info small { font-size: 11.5px; color: var(--text-mute); }
.room-seat.is-me { border-color: rgba(139, 92, 246, 0.55); background: rgba(139, 92, 246, 0.12); }
.room-seat.is-empty { opacity: 0.6; }

.room-notice {
  width: 100%;
  padding: 10px 16px;
  font-size: 12.5px;
  border-radius: 12px;
  color: #fca5a5;
  border: 1px solid rgba(248, 113, 113, 0.32);
  background: rgba(248, 113, 113, 0.1);
}

.uttt-banner-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
}
.uttt-banner-actions:empty { margin-top: 0; }
.room-wait { font-size: 12.5px; color: var(--text-dim); }

.uttt-turn-symbol.is-finished {
  color: var(--text-mute);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}

/* ------------------------------ 响应式 ---------------------------------- */

@media (max-width: 640px) {
  .uttt-board { gap: 8px; padding: 9px; }
  .uttt-sub { padding: 4px; border-radius: 12px; }
  .uttt-sub-grid { gap: 3px; }
  .uttt-status { flex-direction: column; align-items: flex-start; gap: 12px; }
  .uttt-score { align-self: stretch; }
  .uttt-score-item { flex: 1 1 0; justify-content: center; }

  .room-grid { grid-template-columns: 1fr; }
  .room-bar { flex-direction: column; }
  .room-code { flex-direction: row; gap: 10px; }
  .room-code-label { font-size: 12px; }
  .room-code-value { font-size: 20px; }
  .mode-tab small { display: none; }
}