/* ============================================================
   public/styles/apps/connect-dots-page.css — 连点成线（Dot Connect）
   ------------------------------------------------------------
   与 connect-four / gobang / point24 / dots-and-boxes 视觉一致：
   深色玻璃 + 蓝金霓虹。
   ============================================================ */

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

html, body {
  margin: 0;
  background: radial-gradient(circle at 20% 20%, #1e3a8a 0%, #0f172a 60%, #020617 100%);
  color: var(--cd-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
   ============================================================ */
.cd-back-wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px 0;
}
.cd-back {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--cd-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--cd-border);
  color: var(--cd-text-dim);
  text-decoration: none;
  font-size: 13px;
  transition: all .2s ease;
}
.cd-back:hover { color: var(--cd-blue-soft); border-color: var(--cd-blue); }

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

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

.cd-board-wrap {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--cd-card);
  border: 1px solid var(--cd-border);
  border-radius: 18px;
  backdrop-filter: blur(14px);
  padding: 12px;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  touch-action: none;
  user-select: none;
}
.cd-board {
  width: 100%;
  height: 100%;
  display: block;
}
.cd-cell {
  fill: rgba(255, 255, 255, 0.03);
  stroke: rgba(148, 163, 184, 0.1);
  stroke-width: 0.8;
  transition: fill .15s ease;
}
.cd-endpoint {
  transition: transform .15s ease, filter .15s ease;
}
.cd-endpoint:hover {
  filter: brightness(1.2) drop-shadow(0 0 6px rgba(255, 255, 255, 0.4));
  transform: scale(1.08);
}
/* 降级提示：端点对脉冲（transform-box 让 scale 围绕圆心而非 SVG 原点） */
.cd-endpoint.cd-pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: cd-ep-pulse 1.6s ease-in-out;
}
@keyframes cd-ep-pulse {
  0%, 100% { transform: scale(1); filter: brightness(1); }
  50% {
    transform: scale(1.4);
    filter: brightness(1.4) drop-shadow(0 0 10px rgba(245, 158, 11, 0.95));
  }
}
.cd-path {
  transition: stroke-dashoffset .25s ease, opacity .25s ease;
}
.cd-path.drawing {
  opacity: 0.85;
}
.cd-path.hint {
  filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.85));
  animation: cd-hint-pulse 1.5s ease-in-out forwards;
}
@keyframes cd-hint-pulse {
  0%   { opacity: 0; stroke-width: 0; }
  20%  { opacity: 1; stroke-width: 22; }
  80%  { opacity: 1; stroke-width: 14; }
  100% { opacity: 0; stroke-width: 0; }
}

.cd-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(--cd-border);
  font-size: 13px;
  color: var(--cd-text-dim);
  pointer-events: none;
  white-space: nowrap;
  max-width: calc(100% - 32px);
  overflow: hidden;
  text-overflow: ellipsis;
}
.cd-status.win { color: var(--cd-blue-soft); border-color: var(--cd-blue); }
.cd-status.error { color: #fca5a5; border-color: var(--cd-red); }

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

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

.cd-keys {
  font-size: 12px;
  color: var(--cd-text-dim);
  padding: 0 4px;
}
.cd-keys kbd {
  display: inline-block;
  padding: 1px 6px;
  margin: 0 2px;
  border-radius: 4px;
  background: rgba(148, 163, 184, 0.15);
  border: 1px solid rgba(148, 163, 184, 0.25);
  font-family: ui-monospace, monospace;
  font-size: 11px;
}

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

/* ============================================================
   互导 banner
   ============================================================ */
.cd-cross-link {
  margin-top: 22px;
  padding: 10px 16px;
  background: var(--cd-card);
  border: 1px solid var(--cd-border);
  border-radius: 999px;
  text-align: center;
  font-size: 12px;
  color: var(--cd-text-dim);
  backdrop-filter: blur(14px);
}
.cd-cross-link a {
  color: var(--cd-blue-soft);
  text-decoration: none;
  margin: 0 6px;
  transition: color .15s ease;
}
.cd-cross-link a:hover { color: var(--cd-gold-soft); }
.cd-cross-link a.self { color: var(--cd-gold-soft); }
.cd-cross-link .sep { color: var(--cd-text-dim); opacity: 0.5; margin: 0 6px; }

/* ============================================================
   模态框
   ============================================================ */
.cd-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;
}
.cd-modal-mask.show { display: flex; }
.cd-modal {
  width: min(420px, calc(100% - 32px));
  padding: 28px 28px 22px;
  background: var(--cd-card-strong);
  border: 1px solid var(--cd-border);
  border-radius: 18px;
  text-align: center;
  backdrop-filter: blur(14px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
}
.cd-modal h2 {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--cd-blue-soft);
  text-shadow: 0 0 16px rgba(59, 130, 246, 0.5);
}
.cd-modal .sub { font-size: 13px; color: var(--cd-text-dim); margin-bottom: 12px; }
.cd-modal .result {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin: 12px 0 16px;
}
.cd-modal .result .r {
  background: rgba(15, 23, 42, 0.45);
  border: 1px solid var(--cd-border);
  border-radius: 10px;
  padding: 6px 4px;
}
.cd-modal .result .l { font-size: 10px; color: var(--cd-text-dim); }
.cd-modal .result .v { font-size: 14px; font-weight: 700; }
.cd-modal .actions { display: flex; gap: 10px; justify-content: center; }

/* ============================================================
   Toast
   ============================================================ */
.cd-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(--cd-border);
  color: var(--cd-text);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 1000;
}
.cd-toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }
.cd-toast.error { border-color: var(--cd-red); color: #fca5a5; }