/* ============================================================
   public/styles/apps/dots-and-boxes-page.css — 点格棋（Dots and Boxes）
   ------------------------------------------------------------
   与 connect-four / gobang / point24 视觉一致：深色玻璃 + 蓝金霓虹。
   ============================================================ */

:root {
  --dab-bg: #0f172a;
  --dab-card: rgba(15, 23, 42, 0.6);
  --dab-card-strong: rgba(15, 23, 42, 0.78);
  --dab-border: rgba(148, 163, 184, 0.18);
  --dab-blue: #3b82f6;
  --dab-blue-soft: #60a5fa;
  --dab-blue-deep: #1d4ed8;
  --dab-gold: #f59e0b;
  --dab-gold-soft: #fde68a;
  --dab-gold-deep: #b45309;
  --dab-text: #e2e8f0;
  --dab-text-dim: #94a3b8;
  --dab-red: #ef4444;
}

html, body {
  margin: 0;
  background: radial-gradient(circle at 20% 20%, #1e3a8a 0%, #0f172a 60%, #020617 100%);
  color: var(--dab-text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  letter-spacing: 0.02em;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 24px 64px;
}

/* ============================================================
   顶部 / 返回
   ============================================================ */
.dab-back-wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px 0;
}
.dab-back {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--dab-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--dab-border);
  color: var(--dab-text-dim);
  text-decoration: none;
  font-size: 13px;
  transition: all .2s ease;
}
.dab-back:hover { color: var(--dab-blue-soft); border-color: var(--dab-blue); }

/* ============================================================
   标题
   ============================================================ */
.dab-head {
  text-align: center;
  margin: 8px 0 18px;
}
.dab-head h1 {
  margin: 0 0 6px;
  font-size: 30px;
  font-weight: 800;
  background: linear-gradient(120deg, var(--dab-blue-soft), var(--dab-gold-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 0.08em;
}
.dab-head .sub {
  color: var(--dab-text-dim);
  font-size: 13px;
}

/* ============================================================
   先手选择
   ============================================================ */
.dab-side-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 0 0 18px;
}
.dab-side-btn {
  padding: 8px 22px;
  border-radius: 999px;
  background: var(--dab-card);
  border: 1px solid var(--dab-border);
  color: var(--dab-text-dim);
  font-size: 14px;
  cursor: pointer;
  transition: all .2s ease;
  backdrop-filter: blur(14px);
}
.dab-side-btn.active {
  background: rgba(59, 130, 246, 0.18);
  color: var(--dab-blue-soft);
  border-color: var(--dab-blue);
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.35);
}
.dab-side-btn.gold.active {
  background: rgba(245, 158, 11, 0.18);
  color: var(--dab-gold-soft);
  border-color: var(--dab-gold);
  box-shadow: 0 0 18px rgba(245, 158, 11, 0.35);
}

/* ============================================================
   游戏区
   ============================================================ */
.dab-game {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 22px;
  align-items: start;
}
@media (max-width: 760px) {
  .dab-game { grid-template-columns: 1fr; }
}

.dab-board-wrap {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--dab-card);
  border: 1px solid var(--dab-border);
  border-radius: 18px;
  backdrop-filter: blur(14px);
  padding: 12px;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  transition: box-shadow .35s ease;
}
.dab-board-wrap.thinking {
  box-shadow: 0 12px 36px rgba(245, 158, 11, 0.45), 0 0 32px rgba(245, 158, 11, 0.25) inset;
}
.dab-board-wrap.stage-win {
  box-shadow: 0 12px 36px rgba(59, 130, 246, 0.45), 0 0 32px rgba(59, 130, 246, 0.25) inset;
}
.dab-board-wrap.stage-lose {
  box-shadow: 0 12px 36px rgba(239, 68, 68, 0.45), 0 0 32px rgba(239, 68, 68, 0.25) inset;
}
.dab-board-wrap.stage-draw {
  box-shadow: 0 12px 36px rgba(148, 163, 184, 0.35), 0 0 24px rgba(148, 163, 184, 0.18) inset;
}

.dab-board {
  width: 100%;
  height: 100%;
  display: block;
}
.dab-status {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid var(--dab-border);
  font-size: 13px;
  color: var(--dab-text-dim);
  pointer-events: none;
  white-space: nowrap;
}
.dab-status.thinking { color: var(--dab-gold-soft); border-color: var(--dab-gold); }
.dab-status.win { color: var(--dab-blue-soft); border-color: var(--dab-blue); }
.dab-status.lose { color: #fca5a5; border-color: var(--dab-red); }
.dab-status.draw { color: var(--dab-text-dim); }

/* SVG 元素 */
.dab-dot { fill: rgba(255, 255, 255, 0.55); }
.dab-box {
  fill: rgba(0, 0, 0, 0.18);
  stroke: rgba(148, 163, 184, 0.12);
  stroke-width: 1;
  transition: fill .3s ease;
}
.dab-box.p-user { fill: rgba(59, 130, 246, 0.45); stroke: var(--dab-blue); stroke-width: 1.4; }
.dab-box.p-ai   { fill: rgba(245, 158, 11, 0.45); stroke: var(--dab-gold); stroke-width: 1.4; }

.dab-line {
  stroke: transparent;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke .3s ease, filter .3s ease;
  pointer-events: none;
}
.dab-line.drawn.user { stroke: var(--dab-blue); filter: drop-shadow(0 0 6px rgba(59, 130, 246, 0.6)); }
.dab-line.drawn.ai   { stroke: var(--dab-gold); filter: drop-shadow(0 0 6px rgba(245, 158, 11, 0.6)); }
.dab-line.last { stroke-width: 10; }

.dab-edge { cursor: pointer; }
.dab-edge:focus { outline: none; }
.dab-edge:focus .dab-hit { stroke: var(--dab-blue-soft); stroke-width: 2; }

.dab-hit {
  fill: rgba(255, 255, 255, 0.04);
  stroke: transparent;
  transition: fill .15s ease, stroke .15s ease;
}
.dab-edge:hover .dab-hit { fill: rgba(96, 165, 250, 0.18); stroke: rgba(96, 165, 250, 0.55); stroke-width: 1.2; }
.dab-hit.disabled { pointer-events: none; }

/* 闭环飘字 */
.dab-plus-floater {
  position: absolute;
  left: 50%;
  top: 38%;
  transform: translateX(-50%);
  font-size: 38px;
  font-weight: 900;
  color: var(--dab-blue-soft);
  text-shadow: 0 0 14px rgba(59, 130, 246, 0.75);
  pointer-events: none;
  animation: dab-float 1.2s ease-out forwards;
}
.dab-plus-floater.ai {
  color: var(--dab-gold-soft);
  text-shadow: 0 0 14px rgba(245, 158, 11, 0.75);
}
@keyframes dab-float {
  0%   { opacity: 0; transform: translate(-50%, 10px) scale(0.8); }
  20%  { opacity: 1; transform: translate(-50%, -8px) scale(1.1); }
  100% { opacity: 0; transform: translate(-50%, -42px) scale(1); }
}

/* ============================================================
   侧栏
   ============================================================ */
.dab-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dab-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}
.dab-stat-card {
  padding: 10px 12px;
  background: var(--dab-card);
  border: 1px solid var(--dab-border);
  border-radius: 12px;
  backdrop-filter: blur(14px);
}
.dab-stat-card .l { font-size: 11px; color: var(--dab-text-dim); }
.dab-stat-card .v { font-size: 18px; font-weight: 800; }
.dab-stat-card .v small { font-size: 11px; font-weight: 500; color: var(--dab-text-dim); margin-left: 2px; }
.dab-stat-card.is-time { border-color: rgba(245, 158, 11, 0.4); }
.dab-stat-card.is-best { border-color: rgba(59, 130, 246, 0.4); }

.dab-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.dab-btn {
  flex: 1;
  min-width: 80px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--dab-card);
  border: 1px solid var(--dab-border);
  color: var(--dab-text);
  font-size: 13px;
  cursor: pointer;
  transition: all .15s ease;
  backdrop-filter: blur(14px);
}
.dab-btn:hover:not(:disabled) {
  border-color: var(--dab-blue);
  color: var(--dab-blue-soft);
}
.dab-btn:disabled { opacity: .35; cursor: not-allowed; }
.dab-btn.primary { background: linear-gradient(120deg, var(--dab-blue), var(--dab-blue-deep)); color: #fff; border-color: transparent; }
.dab-btn.primary:hover { filter: brightness(1.1); color: #fff; }
.dab-btn.danger:hover { border-color: var(--dab-red); color: #fca5a5; }

.dab-debug {
  background: var(--dab-card);
  border: 1px solid var(--dab-border);
  border-radius: 12px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--dab-text-dim);
}
.dab-debug summary { cursor: pointer; user-select: none; }
.dab-debug-body { margin-top: 6px; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; }
.dab-kv { display: flex; justify-content: space-between; gap: 8px; }
.dab-kv b { color: var(--dab-blue-soft); font-weight: 600; }

.dab-status-info {
  padding: 10px 12px;
  background: var(--dab-card);
  border: 1px solid var(--dab-border);
  border-radius: 12px;
  font-size: 12px;
  color: var(--dab-text-dim);
}
.dab-status-info .guest { color: var(--dab-gold-soft); }

/* ============================================================
   模态框
   ============================================================ */
.dab-modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
}
.dab-modal-mask.show { display: flex; }
.dab-modal {
  width: min(420px, calc(100% - 32px));
  padding: 28px 28px 22px;
  background: var(--dab-card-strong);
  border: 1px solid var(--dab-border);
  border-radius: 18px;
  text-align: center;
  backdrop-filter: blur(14px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
}
.dab-modal h2 { margin: 0 0 6px; font-size: 24px; font-weight: 800; letter-spacing: 0.08em; }
.dab-modal h2.win  { color: var(--dab-blue-soft); text-shadow: 0 0 16px rgba(59, 130, 246, 0.5); }
.dab-modal h2.lose { color: #fca5a5; }
.dab-modal h2.draw { color: var(--dab-text-dim); }
.dab-modal .sub { font-size: 13px; color: var(--dab-text-dim); margin-bottom: 12px; }
.dab-modal .result {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin: 12px 0 16px;
}
.dab-modal .result .r {
  background: rgba(15, 23, 42, 0.45);
  border: 1px solid var(--dab-border);
  border-radius: 10px;
  padding: 6px 4px;
}
.dab-modal .result .l { font-size: 10px; color: var(--dab-text-dim); }
.dab-modal .result .v { font-size: 14px; font-weight: 700; }
.dab-modal .actions { display: flex; gap: 10px; justify-content: center; }

.dab-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--dab-gold), var(--dab-gold-deep));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 8px;
}
.dab-badge.guest { background: rgba(148, 163, 184, 0.3); color: var(--dab-text-dim); }

/* ============================================================
   Toast
   ============================================================ */
.dab-toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid var(--dab-border);
  color: var(--dab-text);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 1000;
}
.dab-toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }
.dab-toast.error { border-color: var(--dab-red); color: #fca5a5; }

/* ============================================================
   粒子
   ============================================================ */
.dab-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.dab-particles span {
  position: absolute;
  top: -10%;
  opacity: 0;
  animation: dab-fall linear infinite;
}
@keyframes dab-fall {
  0%   { transform: translateY(-10vh); opacity: 0; }
  10%  { opacity: 1; }
  100% { transform: translateY(110vh); opacity: 0; }
}