/* ============================================================
   中国象棋 — 顶级质感视觉
   设计语言: 深胡桃木 + 烫金 + 珐琅棋子 + 绸绒外圈
   ============================================================ */

/* ---------- Reset & Tokens ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* 字体 */
  --font-serif: "STKaiti", "KaiTi", "Kaiti SC", "Noto Serif SC", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, - sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Menlo", "Consolas", monospace;

  /* 字号阶梯 */
  --fs-xs: 11px; --fs-sm: 13px; --fs-base: 15px; --fs-md: 17px;
  --fs-lg: 22px; --fs-xl: 32px; --fs-2xl: 48px;

  /* 间距 */
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px;

  /* 圆角 */
  --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 22px; --r-pill:  999px;

  /* 颜色: 深胡桃木色系 */
  --felt-0: #050302;
  --felt-1: #110b06;
  --felt-2: #1c120a;
  --felt-3: #2a1c10;

  --wood-deep:  #3d2611;
  --wood-dark:  #5a3d18;
  --wood-mid:   #8a5a26;
  --wood:       #b07a35;
  --wood-light: #c89957;
  --wood-hi:    #d9a05b;
  --wood-edge:  #2a1a08;

  /* 烫金 */
  --gold-0: #6e4d10;
  --gold-1: #a87b28;
  --gold-2: #d8a44c;
  --gold-3: #e8b64c;
  --gold-4: #f4d27a;
  --gold-5: #fbe9b5;
  --gold-glow: rgba(232, 182, 76, .35);

  /* 文字 */
  --ink-0: #fbe9b5;
  --ink-1: #e8c98c;
  --ink-2: #b99d74;
  --ink-3: #7e6850;
  --ink-4: #564537;

  /* 红/黑棋子 */
  --red-ink: #a31e1e;
  --red-ink-2: #6e0000;
  --black-ink: #1a1208;
  --black-ink-2: #0a0604;

  /* 提示 */
  --hint: #4df0ff;
  --hint-2: #22c8d9;
  --hint-glow: rgba(77, 240, 255, .55);

  /* 警告 */
  --danger: #ff4d3a;
  --danger-glow: rgba(255, 77, 58, .65);

  /* 阴影 */
  --shadow-1: 0 2px 4px rgba(0, 0, 0, .35);
  --shadow-2: 0 6px 16px rgba(0, 0, 0, .45);
  --shadow-3: 0 16px 40px rgba(0, 0, 0, .55);
  --shadow-4: 0 32px 80px rgba(0, 0, 0, .65);

  /* 动画 */
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-in-out: cubic-bezier(.65, 0, .35, 1);
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
}

html, body {
  height: 100%;
  font-family: var(--font-sans);
  color: var(--ink-1);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   全局: 远景光斑背景
   ============================================================ */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.bg-aurora .blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .55;
  animation: drift 28s ease-in-out infinite alternate;
}
.bg-aurora .blob.a { width: 480px; height: 480px; top: -120px; left: -160px; background: radial-gradient(circle, rgba(232, 182, 76, .4), transparent 70%); }
.bg-aurora .blob.b { width: 560px; height: 560px; bottom: -200px; right: -180px; background: radial-gradient(circle, rgba(180, 90, 30, .35), transparent 70%); animation-delay: -10s; }
.bg-aurora .blob.c { width: 360px; height: 360px; top: 40%; left: 60%; background: radial-gradient(circle, rgba(77, 240, 255, .12), transparent 70%); animation-delay: -18s; }
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(60px, 40px) scale(1.1); }
}

/* ============================================================
   大厅 (lobby-body)
   ============================================================ */
.lobby-body {
  background:
    radial-gradient(ellipse at 50% 0%, #2a1c10 0%, var(--felt-2) 30%, var(--felt-1) 70%, var(--felt-0) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 20px;
  min-height: 100vh;
}

/* ---------- 顶部品牌 ---------- */
.brand {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
}
.brand-mark {
  width: 64px; height: 64px;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, .5)) drop-shadow(0 0 18px var(--gold-glow));
  animation: brand-breathe 4s ease-in-out infinite;
}
@keyframes brand-breathe {
  0%, 100% { filter: drop-shadow(0 4px 12px rgba(0, 0, 0, .5)) drop-shadow(0 0 18px var(--gold-glow)); }
  50% { filter: drop-shadow(0 4px 12px rgba(0, 0, 0, .5)) drop-shadow(0 0 28px rgba(232, 182, 76, .55)); }
}
.brand-text { text-align: center; }
.brand-text h1 {
  font-family: var(--font-serif);
  font-size: var(--fs-2xl);
  font-weight: bold;
  letter-spacing: 16px;
  color: var(--gold-4);
  text-shadow:
    0 1px 0 rgba(0, 0, 0, .4),
    0 2px 8px rgba(0, 0, 0, .6),
    0 0 24px var(--gold-glow);
  margin-left: 16px; /* offset letter-spacing for visual centering */
}
.brand-text p {
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  color: var(--ink-2);
  letter-spacing: 6px;
  margin-top: 4px;
  margin-left: 6px;
}

/* ---------- 中央卡片 ---------- */
.lobby-card-wrap {
  position: relative;
  z-index: 1;
  width: min(92vw, 420px);
}
.lobby-card {
  position: relative;
  background:
    /* 烫金边框 inner */
    linear-gradient(180deg, rgba(184, 137, 67, .08), rgba(184, 137, 67, 0)) padding-box,
    linear-gradient(180deg, rgba(184, 137, 67, .85), rgba(168, 123, 40, .55)) padding-box,
    /* 木纹底 */
    linear-gradient(135deg, #2a1c10 0%, #1c120a 50%, #2a1c10 100%) padding-box;
  border: 1px solid transparent;
  border-radius: var(--r-lg);
  padding: 36px 32px;
  box-shadow:
    var(--shadow-4),
    inset 0 1px 0 rgba(255, 220, 160, .12),
    inset 0 -1px 0 rgba(0, 0, 0, .4);
  overflow: hidden;
}
.lobby-card::before {
  /* 烫金 1px 内圈 */
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: calc(var(--r-lg) - 4px);
  border: 1px solid var(--gold-2);
  opacity: .35;
  pointer-events: none;
}
.lobby-card::after {
  /* 顶部高光线 */
  content: '';
  position: absolute;
  inset: 6px 6px auto 6px;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(255, 230, 170, .35) 30%, rgba(255, 230, 170, .35) 70%, transparent);
  pointer-events: none;
}

/* 角花装饰 */
.card-corner {
  position: absolute;
  width: 24px; height: 24px;
  pointer-events: none;
  opacity: .65;
}
.card-corner::before, .card-corner::after {
  content: '';
  position: absolute;
  background: var(--gold-3);
  box-shadow: 0 0 8px var(--gold-glow);
}
.card-corner::before { width: 1px; height: 100%; }
.card-corner::after { width: 100%; height: 1px; }
.card-corner.tl { top: 10px; left: 10px; }
.card-corner.tr { top: 10px; right: 10px; }
.card-corner.tr::before { right: 0; }
.card-corner.tr::after { right: 0; }
.card-corner.bl { bottom: 10px; left: 10px; }
.card-corner.bl::before { bottom: 0; }
.card-corner.br { bottom: 10px; right: 10px; }
.card-corner.br::before { right: 0; bottom: 0; }
.card-corner.br::after { right: 0; bottom: 0; }

/* 卡片头部 */
.card-header { text-align: center; margin-bottom: 28px; }
.kicker {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  letter-spacing: 4px;
  color: var(--gold-3);
  border: 1px solid var(--gold-2);
  border-radius: var(--r-pill);
  padding: 3px 14px;
  background: rgba(184, 137, 67, .08);
  margin-bottom: 12px;
  text-transform: uppercase;
}
.card-header h2 {
  font-family: var(--font-serif);
  font-size: var(--fs-xl);
  font-weight: bold;
  letter-spacing: 8px;
  color: var(--gold-4);
  text-shadow:
    0 1px 0 rgba(0, 0, 0, .3),
    0 0 16px rgba(232, 182, 76, .25);
  margin-left: 8px;
}
.card-header .sub {
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  color: var(--ink-2);
  line-height: 1.8;
  margin-top: 14px;
  letter-spacing: 1px;
}
.card-header .sub strong {
  color: var(--gold-3);
  font-weight: bold;
  text-shadow: 0 0 6px rgba(232, 182, 76, .35);
}

/* 输入字段 (floating label) */
.card-body { display: flex; flex-direction: column; gap: 26px; }
.field {
  position: relative;
  height: 56px;
}
.field input {
  position: absolute;
  inset: 0;
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ink-0);
  font-size: var(--fs-md);
  font-family: var(--font-sans);
  padding: 18px 0 6px;
  letter-spacing: 2px;
}
.field input:-webkit-autofill,
.field input:-webkit-autofill:hover,
.field input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--ink-0);
  -webkit-box-shadow: 0 0 0 1000px transparent inset;
  transition: background-color 5000s ease-in-out 0s;
}
.field-label {
  position: absolute;
  top: 18px;
  left: 0;
  font-size: var(--fs-base);
  font-family: var(--font-serif);
  letter-spacing: 4px;
  color: var(--ink-3);
  pointer-events: none;
  transition: all .25s var(--ease-out);
}
.field input:focus + .field-label,
.field input:not(:placeholder-shown) + .field-label {
  top: -2px;
  font-size: var(--fs-xs);
  color: var(--gold-3);
  letter-spacing: 3px;
}
.field-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--ink-4);
}
.field-line::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  width: 0;
  height: 1px;
  background: linear-gradient(to right, var(--gold-1), var(--gold-3), var(--gold-1));
  box-shadow: 0 0 8px var(--gold-glow);
  transition: all .35s var(--ease-out);
  transform: translateX(-50%);
}
.field input:focus ~ .field-line::after { width: 100%; }
.field.shake { animation: shake .4s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* 主按钮 (烫金 CTA) */
.cta {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
  height: 56px;
  font-family: var(--font-serif);
  font-size: var(--fs-md);
  font-weight: bold;
  letter-spacing: 6px;
  color: #2a1a08;
  background: linear-gradient(180deg, #f4d27a 0%, #e8b64c 45%, #c89a3e 100%);
  border: 1px solid #d8a44c;
  border-radius: var(--r-md);
  cursor: pointer;
  box-shadow:
    0 6px 20px rgba(232, 182, 76, .35),
    inset 0 1px 0 rgba(255, 250, 220, .65),
    inset 0 -2px 0 rgba(120, 80, 20, .4);
  transition: all .25s var(--ease-out);
  overflow: hidden;
}
.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 250, 220, .55) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform .6s ease;
}
.cta:hover {
  transform: translateY(-2px);
  box-shadow:
    0 10px 28px rgba(232, 182, 76, .5),
    inset 0 1px 0 rgba(255, 250, 220, .7),
    inset 0 -2px 0 rgba(120, 80, 20, .4);
}
.cta:hover::before { transform: translateX(100%); }
.cta:active { transform: translateY(0); }
.cta-arrow { font-size: 22px; transition: transform .25s var(--ease-out); }
.cta:hover .cta-arrow { transform: translateX(4px); }

/* 卡片底部 */
.card-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 230, 170, .08);
}
.hint-dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold-3);
  box-shadow: 0 0 8px var(--gold-glow);
  animation: dot-pulse 1.8s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .6; transform: scale(.8); }
}
.card-footer small {
  font-size: var(--fs-xs);
  color: var(--ink-3);
  letter-spacing: 1px;
}

/* 浮动印章装饰 (右下) */
.hero-stamp {
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 140px;
  height: 140px;
  opacity: .5;
  pointer-events: none;
  transform: rotate(-12deg);
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, .3));
}

/* 底部 */
.footline {
  margin-top: auto;
  padding-top: 40px;
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  letter-spacing: 6px;
  color: var(--ink-3);
  opacity: .6;
  z-index: 1;
}

/* ============================================================
   对局 (game-body)
   ============================================================ */
.game-body {
  background:
    radial-gradient(ellipse at 50% 0%, var(--felt-3) 0%, var(--felt-2) 35%, var(--felt-1) 70%, var(--felt-0) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 14px 22px;
  min-height: 100vh;
  gap: 14px;
}

/* ---------- 顶部玩家条 ---------- */
.game-top {
  position: relative;
  z-index: 1;
  width: min(96vw, 560px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
}
.player-card {
  position: relative;
}
.player-frame {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(46, 36, 24, .75), rgba(28, 18, 10, .75));
  border: 1px solid rgba(184, 137, 67, .25);
  box-shadow:
    var(--shadow-2),
    inset 0 1px 0 rgba(255, 220, 160, .08);
  overflow: hidden;
  transition: all .35s var(--ease-out);
}
.player-card.active .player-frame {
  border-color: var(--gold-3);
  background: linear-gradient(180deg, rgba(60, 45, 25, .85), rgba(40, 28, 16, .85));
  box-shadow:
    0 0 0 1px var(--gold-2),
    0 0 24px rgba(232, 182, 76, .35),
    inset 0 1px 0 rgba(255, 230, 170, .15),
    var(--shadow-2);
}
.player-card.active::after {
  /* 当前回合金色脉冲 */
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--r-lg);
  pointer-events: none;
  border: 1px solid var(--gold-3);
  animation: active-pulse 1.6s ease-in-out infinite;
}
@keyframes active-pulse {
  0%, 100% { opacity: .4; box-shadow: 0 0 12px rgba(232, 182, 76, .35); }
  50% { opacity: .9; box-shadow: 0 0 24px rgba(232, 182, 76, .55); }
}

/* 头像 */
.avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  box-shadow:
    0 4px 10px rgba(0, 0, 0, .5),
    inset 0 1px 0 rgba(255, 255, 255, .15);
}
.avatar::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid rgba(255, 220, 160, .25);
  pointer-events: none;
}
.avatar.red {
  background:
    radial-gradient(circle at 32% 28%, #e8b6a8, #c0392b 45%, #7a0e0e 95%);
}
.avatar.black {
  background:
    radial-gradient(circle at 32% 28%, #6a6a6a, #1a1a1a 50%, #000 100%);
}
.avatar-mark {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: bold;
  color: rgba(255, 245, 220, .9);
  text-shadow:
    0 1px 0 rgba(0, 0, 0, .4),
    0 0 4px rgba(255, 240, 200, .25);
  letter-spacing: 0;
}
.avatar.red .avatar-mark { color: rgba(255, 230, 200, .95); }

.player-meta { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.player-meta .role {
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  letter-spacing: 2px;
  color: var(--ink-3);
}
.player-meta .name {
  font-family: var(--font-serif);
  font-size: var(--fs-md);
  font-weight: bold;
  color: var(--ink-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 1px;
}
.player-card.active .player-meta .name { color: var(--gold-4); }

/* 计时器 */
.clock {
  display: flex;
  align-items: baseline;
  gap: 2px;
  padding: 6px 12px;
  border-radius: var(--r-md);
  background: rgba(0, 0, 0, .4);
  border: 1px solid rgba(255, 220, 160, .08);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, .4);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.clock-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: bold;
  color: var(--ink-1);
  letter-spacing: 0;
  min-width: 36px;
  text-align: right;
}
.clock-unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-3);
  margin-left: 2px;
}
.player-card.active .clock-num { color: var(--gold-4); }
.player-card .clock { transition: all .3s var(--ease-out); }
.player-card .clock.danger {
  background: rgba(120, 20, 10, .35);
  border-color: var(--danger);
  box-shadow:
    inset 0 2px 6px rgba(120, 20, 10, .5),
    0 0 16px var(--danger-glow);
  animation: clock-danger 0.8s ease-in-out infinite;
}
.player-card .clock.danger .clock-num {
  color: var(--danger);
  text-shadow: 0 0 8px var(--danger-glow);
}
@keyframes clock-danger {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

/* VS 块 */
.vs-block {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-3), var(--gold-1));
  color: #2a1a08;
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  font-weight: bold;
  letter-spacing: 1px;
  box-shadow:
    0 4px 12px var(--gold-glow),
    inset 0 1px 0 rgba(255, 250, 220, .65),
    inset 0 -2px 0 rgba(120, 80, 20, .4);
  flex-shrink: 0;
}

/* ---------- 棋盘舞台 ---------- */
.board-stage {
  position: relative;
  width: min(94vw, 480px);
  padding: 18px;
  border-radius: var(--r-xl);
  background:
    /* 颗粒 noise */
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='80'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .09 0'/></filter><rect width='80' height='80' filter='url(%23n)'/></svg>"),
    radial-gradient(circle at 30% 25%, rgba(184, 137, 67, .12), transparent 60%),
    linear-gradient(160deg, var(--felt-3) 0%, var(--felt-2) 50%, var(--felt-1) 100%);
  box-shadow:
    inset 0 0 0 1px rgba(232, 182, 76, .12),
    inset 0 0 60px rgba(0, 0, 0, .55),
    inset 0 1px 0 rgba(255, 220, 160, .05),
    var(--shadow-3);
  border: 1px solid rgba(184, 137, 67, .18);
}

/* 角花 */
.board-corner {
  position: absolute;
  width: 36px; height: 36px;
  pointer-events: none;
  opacity: .55;
}
.board-corner::before, .board-corner::after {
  content: '';
  position: absolute;
  background: linear-gradient(135deg, var(--gold-3), transparent);
}
.board-corner.tl { top: 4px; left: 4px; }
.board-corner.tl::before { top: 0; left: 0; width: 16px; height: 1px; }
.board-corner.tl::after  { top: 0; left: 0; width: 1px; height: 16px; }
.board-corner.tr { top: 4px; right: 4px; }
.board-corner.tr::before { top: 0; right: 0; width: 16px; height: 1px; }
.board-corner.tr::after  { top: 0; right: 0; width: 1px; height: 16px; }
.board-corner.bl { bottom: 4px; left: 4px; }
.board-corner.bl::before { bottom: 0; left: 0; width: 16px; height: 1px; }
.board-corner.bl::after  { bottom: 0; left: 0; width: 1px; height: 16px; }
.board-corner.br { bottom: 4px; right: 4px; }
.board-corner.br::before { bottom: 0; right: 0; width: 16px; height: 1px; }
.board-corner.br::after  { bottom: 0; right: 0; width: 1px; height: 16px; }

/* 状态徽章 (浮于棋盘下) */
.status-pill {
  position: absolute;
  bottom: -14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 20px;
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  letter-spacing: 4px;
  color: var(--gold-4);
  background: linear-gradient(180deg, var(--felt-3), var(--felt-1));
  border: 1px solid var(--gold-2);
  border-radius: var(--r-pill);
  white-space: nowrap;
  box-shadow:
    0 4px 14px rgba(0, 0, 0, .5),
    inset 0 1px 0 rgba(255, 220, 160, .12),
    0 0 14px rgba(232, 182, 76, .25);
  z-index: 2;
}

/* ---------- 棋盘 ---------- */
.board-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 10;
  transition: transform .4s var(--ease-out);
  /* --cell 由 ui.js 在 buildBoard 后基于实际宽度设置 (像素值) */
}

/* 红方翻转已由 JS 数据驱动 (格子 data-r 定位颠倒), 不再需要 CSS 旋转 */

/* 木纹底 (z 0) */
.board-wrap .wood-bg {
  position: absolute;
  inset: calc(var(--cell) / 2);
  border-radius: 4px;
  background:
    radial-gradient(circle at 25% 35%, rgba(80, 40, 10, .35) 0%, transparent 8%),
    radial-gradient(circle at 70% 65%, rgba(80, 40, 10, .3) 0%, transparent 6%),
    radial-gradient(circle at 80% 25%, rgba(80, 40, 10, .25) 0%, transparent 5%),
    repeating-linear-gradient(94deg, rgba(255, 230, 180, .06) 0, rgba(255, 230, 180, .06) 1px, transparent 1px, transparent 5px),
    repeating-linear-gradient(86deg, rgba(40, 22, 8, .15) 0, rgba(40, 22, 8, .15) 1px, transparent 1px, transparent 9px),
    linear-gradient(135deg, var(--wood-light) 0%, var(--wood) 35%, var(--wood-mid) 65%, var(--wood-light) 100%);
  border: 1px solid var(--wood-deep);
  box-shadow:
    inset 0 0 0 1px var(--gold-2),
    inset 0 0 0 2px var(--wood-edge),
    inset 0 0 32px rgba(0, 0, 0, .25),
    inset 0 1px 0 rgba(255, 230, 180, .35),
    0 4px 12px rgba(0, 0, 0, .35);
  pointer-events: none;
  z-index: 0;
}

/* 网格线 (z 1, 覆盖在木纹之上) — 用 ::before 画竖线, ::after 画横线 */
.board-wrap .grid-lines {
  position: absolute;
  inset: calc(var(--cell) / 2);
  pointer-events: none;
  z-index: 1;
  background:
    repeating-linear-gradient(to right, transparent 0, transparent calc(var(--cell) - 1.5px), var(--wood-deep) calc(var(--cell) - 1.5px), var(--wood-deep) var(--cell));
}
/* 横线用另一个层避免 background 互相冲掉 */
.board-wrap .grid-lines::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--cell) - 1.5px), var(--wood-deep) calc(var(--cell) - 1.5px), var(--wood-deep) var(--cell));
}
/* 九宫斜线 (两个对角线) */
.board-wrap .grid-lines::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    /* 上九宫 (红方) - 在 board 的 0-2 行 */
    linear-gradient(to bottom right, transparent 47.5%, var(--wood-deep) 47.5% 48%, transparent 48%, transparent 52%, var(--wood-deep) 52% 52.5%, transparent 52.5%),
    linear-gradient(to bottom left, transparent 47.5%, var(--wood-deep) 47.5% 48%, transparent 48%, transparent 52%, var(--wood-deep) 52% 52.5%, transparent 52.5%);
}

/* 楚河汉界 (z 2, 覆盖 grid) */
.board-wrap .river-band {
  position: absolute;
  left: calc(var(--cell) / 2);
  right: calc(var(--cell) / 2);
  top: calc(50% - var(--cell) / 2);
  height: var(--cell);
  background: linear-gradient(180deg,
    var(--wood-light) 0%,
    var(--wood) 50%,
    var(--wood-light) 100%);
  border-top: 1px solid var(--wood-deep);
  border-bottom: 1px solid var(--wood-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 2;
}
.river {
  font-family: var(--font-serif);
  font-size: calc(var(--cell) * 0.5);
  font-weight: bold;
  color: rgba(60, 38, 16, .8);
  letter-spacing: calc(var(--cell) * 0.3);
  text-shadow:
    0 1px 0 rgba(255, 230, 180, .55),
    0 -1px 0 rgba(0, 0, 0, .25),
    0 2px 4px rgba(0, 0, 0, .3);
}

/* 格子 (z 3) */
.cell {
  position: absolute;
  width: var(--cell);
  height: var(--cell);
  transform: translate(-50%, -50%);
  left: calc(var(--cell) / 2 + var(--cell) * var(--c));
  top: calc(var(--cell) / 2 + var(--cell) * var(--r));
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 3;
}
.cell[data-r="0"] { --r: 0; } .cell[data-r="1"] { --r: 1; }
.cell[data-r="2"] { --r: 2; } .cell[data-r="3"] { --r: 3; }
.cell[data-r="4"] { --r: 4; } .cell[data-r="5"] { --r: 5; }
.cell[data-r="6"] { --r: 6; } .cell[data-r="7"] { --r: 7; }
.cell[data-r="8"] { --r: 8; } .cell[data-r="9"] { --r: 9; }
.cell[data-c="0"] { --c: 0; } .cell[data-c="1"] { --c: 1; }
.cell[data-c="2"] { --c: 2; } .cell[data-c="3"] { --c: 3; }
.cell[data-c="4"] { --c: 4; } .cell[data-c="5"] { --c: 5; }
.cell[data-c="6"] { --c: 6; } .cell[data-c="7"] { --c: 7; }
.cell[data-c="8"] { --c: 8; }
.cell:hover { z-index: 2; }

/* ============================================================
   棋子 (珐琅工艺: 实木底 + 双层径向 + 内嵌高光 + 立体字符)
   ============================================================ */
.piece {
  width: calc(var(--cell) * 0.86);
  height: calc(var(--cell) * 0.86);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background:
    /* 顶部高光 */
    radial-gradient(circle at 36% 26%, rgba(255, 245, 215, .85) 0%, transparent 28%),
    radial-gradient(circle at 32% 28%, var(--wood-hi) 0%, var(--wood) 35%, var(--wood-mid) 75%, var(--wood-dark) 100%);
  border: 2px solid var(--wood-edge);
  box-shadow:
    /* 落地阴影 */
    0 6px 12px rgba(0, 0, 0, .55),
    0 2px 4px rgba(0, 0, 0, .4),
    /* 顶部内嵌高光 */
    inset 0 2px 2px rgba(255, 240, 200, .55),
    inset 0 -3px 6px rgba(60, 35, 10, .45),
    /* 边缘深色 */
    inset 2px 2px 4px rgba(255, 230, 170, .25),
    inset -2px -2px 4px rgba(40, 22, 8, .4);
  cursor: default;
  transition: transform .18s var(--ease-spring), box-shadow .18s var(--ease-out);
  pointer-events: none;
}
/* 棋子上的字: 永远正面朝玩家 (任何视角/翻转) */
.piece .glyph {
  font-family: var(--font-serif);
  font-size: calc(var(--cell) * 0.5);
  font-weight: bold;
  letter-spacing: 0;
  color: inherit;
  text-shadow:
    0 1px 0 rgba(255, 235, 200, .55),
    0 -1px 0 rgba(0, 0, 0, .25),
    0 2px 2px rgba(0, 0, 0, .25);
}
.piece.red { color: #8b0a0a; }
.piece.black { color: #1a1208; }

/* 棋子中心雕字 (SVG-like 立体效果) */
.piece::before {
  content: '';
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 60%, rgba(0, 0, 0, .08), transparent 60%);
  pointer-events: none;
}

/* ============================================================
   高亮
   ============================================================ */
.cell.sel .piece {
  transform: translateY(-3px) scale(1.05);
  box-shadow:
    0 10px 22px rgba(232, 182, 76, .5),
    0 0 0 2px var(--gold-3),
    0 0 18px var(--gold-glow),
    inset 0 2px 2px rgba(255, 240, 200, .6),
    inset 0 -3px 6px rgba(60, 35, 10, .4);
}

/* 合法落点 (烫金小点) */
.legal-dot {
  position: absolute;
  width: calc(var(--cell) * 0.24);
  height: calc(var(--cell) * 0.24);
  border-radius: 50%;
  background: radial-gradient(circle, var(--gold-4) 0%, var(--gold-2) 70%, transparent 100%);
  box-shadow: 0 0 10px var(--gold-glow);
  pointer-events: none;
  z-index: 0;
}
.cell.legal .legal-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid rgba(255, 230, 170, .35);
  animation: ring-pulse 1.4s ease-in-out infinite;
}
@keyframes ring-pulse {
  0%, 100% { transform: scale(1); opacity: .7; }
  50% { transform: scale(1.35); opacity: 0; }
}

/* 上一步高亮 */
.cell.last-from::after,
.cell.last-to::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  border: 2px solid var(--gold-3);
  pointer-events: none;
  box-shadow: 0 0 10px rgba(232, 182, 76, .35);
}
.cell.last-to {
  background: radial-gradient(circle, rgba(232, 182, 76, .18) 30%, transparent 70%);
}

/* 将军提示 */
.cell.check::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid var(--danger);
  box-shadow: 0 0 14px var(--danger-glow);
  animation: check-pulse 1s ease-in-out infinite;
  pointer-events: none;
}
@keyframes check-pulse {
  0%, 100% { box-shadow: 0 0 8px var(--danger-glow); }
  50% { box-shadow: 0 0 22px var(--danger-glow); }
}

/* AI 提示 */
.cell.hint-from::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  border: 3px solid var(--hint);
  box-shadow: 0 0 14px var(--hint-glow);
  pointer-events: none;
}
.cell.hint-to::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 3px solid var(--hint);
  background: var(--hint-glow);
  animation: hint-pulse 1s ease-in-out infinite;
  pointer-events: none;
}
@keyframes hint-pulse {
  0%, 100% { box-shadow: 0 0 8px var(--hint-glow); }
  50% { box-shadow: 0 0 24px var(--hint-glow); }
}

/* 走子过渡动画: 原位置光点 + 落子环绕发光 + 落地回弹 */
.move-trail-dot {
  position: absolute;
  width: calc(var(--cell) * 0.3);
  height: calc(var(--cell) * 0.3);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 235, 170, .95), rgba(232, 182, 76, .4) 60%, transparent);
  box-shadow: 0 0 14px var(--gold-glow), 0 0 30px rgba(232, 182, 76, .35);
  pointer-events: none;
  z-index: 4;
  animation: trail-dot 0.9s var(--ease-out) forwards;
}
@keyframes trail-dot {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(0.2); opacity: 0; }
}
.move-land-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 3px solid var(--gold-3);
  box-shadow: 0 0 16px var(--gold-glow), inset 0 0 10px rgba(232, 182, 76, .3);
  pointer-events: none;
  z-index: 4;
  animation: land-ring 1.1s var(--ease-out) forwards;
}
@keyframes land-ring {
  0% { transform: scale(0.6); opacity: 0.9; }
  60% { transform: scale(1.15); opacity: 0.6; }
  100% { transform: scale(1.4); opacity: 0; }
}
.piece.landed {
  animation: piece-land 0.4s var(--ease-spring);
}
@keyframes piece-land {
  0% { transform: translateY(-6px) scale(1.05); }
  55% { transform: translateY(1px) scale(0.98); }
  100% { transform: translateY(0) scale(1); }
}

/* ============================================================
   控制栏
   ============================================================ */
.game-controls {
  position: relative;
  z-index: 1;
  width: min(94vw, 480px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.control-row {
  display: flex;
  gap: 10px;
}

.ctrl-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 14px;
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  letter-spacing: 2px;
  color: var(--ink-1);
  background: linear-gradient(180deg, rgba(74, 58, 38, .85), rgba(46, 36, 24, .85));
  border: 1px solid rgba(184, 137, 67, .25);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all .2s var(--ease-out);
  box-shadow:
    var(--shadow-1),
    inset 0 1px 0 rgba(255, 220, 160, .08);
}
.ctrl-btn svg { width: 16px; height: 16px; opacity: .85; }
.ctrl-btn:hover {
  background: linear-gradient(180deg, rgba(90, 72, 48, .9), rgba(58, 46, 30, .9));
  border-color: var(--gold-2);
  transform: translateY(-1px);
  box-shadow:
    var(--shadow-2),
    inset 0 1px 0 rgba(255, 230, 170, .15),
    0 0 12px rgba(232, 182, 76, .2);
}
.ctrl-btn:active { transform: translateY(0); }
.ctrl-btn:disabled { opacity: .35; cursor: default; transform: none; }

/* ---------- 提示开关 ---------- */
.hint-slot { width: 100%; }
.hint-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--r-md);
  border: 1px solid rgba(77, 240, 255, .25);
  background: linear-gradient(180deg, rgba(77, 240, 255, .08), rgba(77, 240, 255, .04));
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  letter-spacing: 2px;
  color: var(--hint);
  cursor: pointer;
  transition: all .2s;
  margin-bottom: 8px;
}
.hint-toggle:hover { background: linear-gradient(180deg, rgba(77, 240, 255, .14), rgba(77, 240, 255, .08)); }
.hint-toggle .switch {
  width: 38px; height: 20px;
  border-radius: var(--r-pill);
  background: rgba(0, 0, 0, .4);
  border: 1px solid rgba(77, 240, 255, .25);
  position: relative;
  transition: all .25s var(--ease-out);
}
.hint-toggle .switch::after {
  content: '';
  position: absolute;
  top: 1px; left: 1px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--ink-2);
  transition: all .25s var(--ease-spring);
}
.hint-toggle.on { border-color: var(--hint); box-shadow: 0 0 18px rgba(77, 240, 255, .25); }
.hint-toggle.on .switch { background: var(--hint); border-color: var(--hint); box-shadow: 0 0 10px var(--hint-glow); }
.hint-toggle.on .switch::after { left: 19px; background: #fff; box-shadow: 0 0 4px rgba(255, 255, 255, .6); }

.hint-levels {
  display: flex;
  align-items: center;
  gap: 6px;
}
.hint-levels .lbl {
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  color: var(--ink-2);
  letter-spacing: 2px;
  margin-right: 4px;
}
.hint-levels .hl {
  flex: 1;
  padding: 6px 0;
  font-family: var(--font-serif);
  font-size: var(--fs-xs);
  letter-spacing: 2px;
  color: var(--ink-3);
  background: rgba(0, 0, 0, .3);
  border: 1px solid rgba(184, 137, 67, .15);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: all .15s;
}
.hint-levels .hl:hover { color: var(--ink-1); border-color: rgba(184, 137, 67, .35); }
.hint-levels .hl.on {
  color: var(--hint);
  border-color: var(--hint);
  background: rgba(77, 240, 255, .14);
  box-shadow: 0 0 12px rgba(77, 240, 255, .25);
}

/* ============================================================
   模态 (带 backdrop + spring 弹出)
   ============================================================ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.modal.show { opacity: 1; pointer-events: auto; }
.modal-card {
  position: relative;
  padding: 24px 40px;
  font-family: var(--font-serif);
  font-size: var(--fs-lg);
  letter-spacing: 4px;
  color: var(--gold-4);
  background: linear-gradient(180deg, rgba(74, 58, 38, .96), rgba(46, 36, 24, .96));
  border: 1px solid var(--gold-2);
  border-radius: var(--r-lg);
  box-shadow:
    var(--shadow-4),
    inset 0 1px 0 rgba(255, 230, 170, .15),
    0 0 32px var(--gold-glow);
  transform: scale(.85) translateY(20px);
  transition: transform .35s var(--ease-spring);
}
.modal.show .modal-card { transform: scale(1) translateY(0); }
.modal-card::before, .modal-card::after {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  pointer-events: none;
}
.modal-card::before { top: 8px; left: 8px; border-top: 1px solid var(--gold-3); border-left: 1px solid var(--gold-3); }
.modal-card::after { bottom: 8px; right: 8px; border-bottom: 1px solid var(--gold-3); border-right: 1px solid var(--gold-3); }

/* ============================================================
   移动端
   ============================================================ */
@media (max-width: 640px) {
  .lobby-body { padding: 24px 16px; }
  .brand-text h1 { font-size: 36px; letter-spacing: 10px; }
  .lobby-card { padding: 28px 24px; }
  .card-header h2 { font-size: 24px; letter-spacing: 6px; }
  .clock-num { font-size: 22px; min-width: 30px; }
  .game-top { grid-template-columns: 1fr auto 1fr; gap: 6px; }
  .player-frame { padding: 8px 10px; gap: 8px; }
  .avatar { width: 38px; height: 38px; }
  .avatar-mark { font-size: 18px; }
  .player-meta .name { font-size: 14px; }
  .vs-block { width: 30px; height: 30px; font-size: 11px; }
  .status-pill { font-size: 12px; padding: 5px 16px; letter-spacing: 3px; }
  .ctrl-btn { padding: 10px 12px; font-size: 12px; }
  .ctrl-btn svg { width: 14px; height: 14px; }
}

@media (max-width: 380px) {
  .clock-unit { display: none; }
}

/* ============================================================
   隐藏工具
   ============================================================ */
.hidden { display: none !important; }

/* 减弱动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}