/* =========================================================
   贪吃蛇页面样式
   - 复用 style.css 的主题变量、按钮、顶栏与图标尺寸
   - 画布配色单独定义在这里（JS 用 getComputedStyle 读取）
   - 断点：980px（单列）、640px（手机细节）
   ========================================================= */

/* ---------- 1. 棋盘配色 ---------- */
:root {
  --snake-board-a: #101521;
  --snake-board-b: #0a0d13;
  --snake-grid: rgba(255, 255, 255, 0.045);
  --snake-a: #5eead4;
  --snake-b: #4f9cf9;
  --snake-glow: rgba(94, 234, 212, 0.5);
  --snake-eye: #ffffff;
  --snake-food: #ff6b6b;
  --snake-food-glow: rgba(255, 107, 107, 0.6);
  --snake-gold: #ffd166;
  --snake-gold-glow: rgba(255, 209, 102, 0.65);
  --snake-wall: #263042;
  --snake-wall-edge: rgba(255, 255, 255, 0.09);
}

html[data-theme="light"] {
  --snake-board-a: #f4f8fe;
  --snake-board-b: #e4ebf6;
  --snake-grid: rgba(15, 23, 42, 0.07);
  --snake-a: #0d9488;
  --snake-b: #1f6fd0;
  --snake-glow: rgba(13, 148, 136, 0.28);
  --snake-eye: #ffffff;
  --snake-food: #e11d48;
  --snake-food-glow: rgba(225, 29, 72, 0.28);
  --snake-gold: #d97706;
  --snake-gold-glow: rgba(217, 119, 6, 0.3);
  --snake-wall: #c2ccdd;
  --snake-wall-edge: rgba(15, 23, 42, 0.1);
}

/* ---------- 2. 页面骨架 ---------- */
body.game-page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.game-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  height: var(--header-h);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.back-link {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.88rem;
  white-space: nowrap;
}

.back-link:hover {
  color: var(--text);
  background: var(--bg-elev-2);
}

.game-main {
  flex: 1;
  padding: clamp(18px, 3vw, 34px) 0 clamp(28px, 4vw, 48px);
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 316px;
  align-items: start;
  gap: clamp(16px, 2.4vw, 28px);
}

/* ---------- 3. 棋盘 ---------- */
.board-panel {
  min-width: 0;
}

.board-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.board-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
}

.board-badge {
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.board-actions {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.84rem;
}

.board-stage {
  position: relative;
  width: min(100%, calc(100vh - 186px));
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  touch-action: none;
}

#snake-canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
}

/* ---------- 4. 开始 / 暂停 / 结束浮层 ---------- */
.overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  padding: clamp(12px, 2.6vw, 26px);
  background: radial-gradient(120% 120% at 50% 0%, rgba(8, 12, 20, 0.5), rgba(8, 12, 20, 0.86));
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.overlay[hidden] {
  display: none;
}

html[data-theme="light"] .overlay {
  background: radial-gradient(120% 120% at 50% 0%, rgba(255, 255, 255, 0.5), rgba(236, 241, 249, 0.9));
}

.overlay-card {
  width: min(100%, 400px);
  max-height: 100%;
  overflow-y: auto;
  padding: clamp(16px, 2.6vw, 24px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  text-align: center;
  touch-action: pan-y;
}

.overlay[data-state="countdown"] .overlay-card {
  border-color: transparent;
  background: transparent;
  box-shadow: none;
}

.overlay-kicker {
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.overlay-title {
  margin-top: 6px;
  font-size: clamp(1.35rem, 3.6vw, 1.75rem);
}

.overlay-text {
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.overlay-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 18px;
}

.overlay-tip {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.76rem;
}

.btn-block {
  width: 100%;
  margin-top: 18px;
}

/* 模式 / 速度分段选择 */
.setup-group {
  margin: 16px 0 0;
  padding: 0;
  border: 0;
  text-align: left;
}

.setup-group legend {
  padding: 0;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.seg {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 5px;
  margin-top: 7px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev-2);
}

.seg-btn {
  padding: 8px 4px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.seg-btn:hover {
  color: var(--text);
}

.seg-btn.is-active {
  background: var(--accent);
  color: #08121f;
}

html[data-theme="light"] .seg-btn.is-active {
  color: #ffffff;
}

.setup-hint {
  min-height: 1.35em;
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* 倒计时 */
.overlay-block[data-for="countdown"] {
  padding: 12px 4px;
}

.countdown {
  color: var(--text);
  font-size: clamp(3rem, 13vw, 5.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  text-shadow: 0 0 36px var(--snake-glow);
}

.countdown.is-pop {
  animation: count-pop 460ms var(--ease);
}

@keyframes count-pop {
  from {
    opacity: 0;
    transform: scale(0.62);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 结算数据 */
.over-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.over-stat {
  padding: 9px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elev-2);
}

.over-stat dt {
  color: var(--text-muted);
  font-size: 0.72rem;
}

.over-stat dd {
  margin: 2px 0 0;
  font-size: 1.12rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.record-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, #ffd166, #f4a261);
  color: #3a2a00;
  font-size: 0.76rem;
  font-weight: 700;
}

.record-badge[hidden] {
  display: none;
}

/* ---------- 5. 右侧面板 ---------- */
.side-panel {
  display: grid;
  gap: 12px;
}

.panel-card {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  box-shadow: var(--shadow);
}

.panel-tag {
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hud-score {
  margin-top: 2px;
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.12;
  font-variant-numeric: tabular-nums;
}

.hud-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 14px;
  margin: 12px 0 0;
}

.hud-grid dt {
  color: var(--text-muted);
  font-size: 0.73rem;
}

.hud-grid dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.combo-track {
  height: 6px;
  margin-top: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--bg-elev-2);
}

.combo-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #ffd166);
  transition: width 100ms linear;
}

.hud-note {
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 0.76rem;
}

.key-list {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.key-list li {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.key-list li span:first-child {
  min-width: 48px;
  color: var(--text);
  font-weight: 600;
}

kbd {
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elev-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

/* 触屏方向键：只在没有精确指针的设备上显示 */
.dpad {
  display: grid;
  grid-template-columns: repeat(3, 46px);
  grid-template-rows: repeat(2, 42px);
  gap: 6px;
  width: max-content;
  margin: 14px auto 0;
}

.dpad-btn {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elev-2);
  color: var(--text);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
}

.dpad-btn:active {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.dpad-up {
  grid-area: 1 / 2;
}

.dpad-left {
  grid-area: 2 / 1;
}

.dpad-down {
  grid-area: 2 / 2;
}

.dpad-right {
  grid-area: 2 / 3;
}

@media (hover: hover) and (pointer: fine) {
  .dpad {
    display: none;
  }
}

.tips-list {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}

.tips-list li {
  position: relative;
  padding-left: 13px;
  color: var(--text-muted);
  font-size: 0.79rem;
}

.tips-list li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- 6. 音效按钮 ---------- */
#sound-toggle .icon-muted {
  display: none;
}

#sound-toggle[aria-pressed="true"] .icon-muted {
  display: block;
}

#sound-toggle[aria-pressed="true"] .icon-sound {
  display: none;
}

#sound-toggle[aria-pressed="true"] {
  color: var(--text-muted);
}

/* ---------- 7. 页脚与工具类 ---------- */
.game-footer {
  padding: 18px 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.82rem;
}

.game-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 980px) {
  .game-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .board-stage {
    width: min(100%, calc(100vh - 160px));
  }

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hud-card {
    grid-column: 1 / -1;
  }

  .tips-card {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .board-title {
    font-size: 1rem;
  }

  .board-stage {
    width: 100%;
    border-radius: var(--radius);
  }

  /* 手机上的棋盘是正方形的，浮层要压紧一点才不会出现滚动条 */
  .overlay {
    padding: 10px;
  }

  .overlay-card {
    width: 100%;
    padding: 14px 16px;
  }

  .overlay-kicker {
    font-size: 0.66rem;
  }

  .overlay-title {
    margin-top: 2px;
    font-size: 1.2rem;
  }

  .overlay-text {
    margin-top: 4px;
    font-size: 0.82rem;
  }

  .setup-group {
    margin-top: 11px;
  }

  .setup-hint {
    margin-top: 6px;
    font-size: 0.74rem;
  }

  .seg {
    margin-top: 5px;
    padding: 3px;
  }

  .seg-btn {
    padding: 7px 3px;
    font-size: 0.8rem;
  }

  .btn-block {
    margin-top: 12px;
    padding: 10px 18px;
  }

  .overlay-tip {
    display: none;
  }

  .side-panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .key-list {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .countdown.is-pop {
    animation: none;
  }

  .combo-fill {
    transition: none;
  }
}