/* 俄罗斯方块页:独立整屏,跟随站点深浅色 */
:root {
  --tetris-bg: #f2f5f9;
  --tetris-line: rgba(0, 0, 0, 0.06);
  --tetris-ghost: rgba(0, 0, 0, 0.18);
  --tetris-flash: #ffffff;
  --tetris-overlay: rgba(255, 255, 255, 0.78);
  --tetris-i: #00acc1;
  --tetris-o: #f9a825;
  --tetris-t: #9c27b0;
  --tetris-s: #43a047;
  --tetris-z: #e53935;
  --tetris-j: #1e88e5;
  --tetris-l: #fb8c00;
}
[data-color-mode*='dark'] {
  --tetris-bg: #14181f;
  --tetris-line: rgba(255, 255, 255, 0.07);
  --tetris-ghost: rgba(255, 255, 255, 0.22);
  --tetris-flash: #ffffff;
  --tetris-overlay: rgba(20, 24, 31, 0.72);
  --tetris-i: #26c6da;
  --tetris-o: #fdd835;
  --tetris-t: #ab47bc;
  --tetris-s: #66bb6a;
  --tetris-z: #ef5350;
  --tetris-j: #42a5f5;
  --tetris-l: #ffa726;
}

.tetris-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 18px;
  box-sizing: border-box;
}
.tetris-bar {
  width: min(92vw, 620px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 2px;
}
.tetris-back { text-decoration: none; color: inherit; font-size: 14px; }
.tetris-back kbd {
  font-size: 11px; padding: 1px 5px; border-radius: 4px;
  border: 1px solid var(--tetris-line); margin-left: 5px;
}
.tetris-stats { display: flex; gap: 12px; font-size: 14px; }
.tetris-stats b { font-family: ui-monospace, monospace; }
.tetris-mute { background: none; border: none; font-size: 18px; cursor: pointer; padding: 2px 6px; }

.tetris-stage { display: flex; gap: 14px; align-items: flex-start; }
.tetris-side { display: flex; flex-direction: column; gap: 10px; order: 1; }   /* 宽屏:侧栏在棋盘右侧 */
.tetris-box {
  border: 1px solid var(--tetris-line);
  border-radius: 10px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.tetris-box-label { font-size: 12px; opacity: 0.65; }
.tetris-box canvas { width: 72px; height: 72px; }

.tetris-boardwrap { position: relative; }
#board {
  display: block;
  height: min(72vh, 600px);
  width: auto;
  aspect-ratio: 1 / 2;
  border-radius: 10px;
  border: 1px solid var(--tetris-line);
}
.tetris-overlay {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; text-align: center; padding: 12px;
  background: var(--tetris-overlay);
  border-radius: 10px;
  cursor: pointer;
}
.tetris-overlay[hidden] { display: none; }
.tetris-overlay-title { font-size: 22px; font-weight: 700; margin: 0; }
.tetris-overlay-text { font-size: 14px; margin: 0; }
.tetris-overlay-keys { font-size: 13px; opacity: 0.75; margin: 0; }

.tetris-dpad {
  display: none;
  width: min(92vw, 560px);
  justify-content: space-between;
  gap: 10px;
}
.tetris-dpad-group { display: flex; gap: 10px; }
.tetris-dpad button {
  width: 56px; height: 56px;
  border-radius: 12px;
  border: 1px solid var(--tetris-line);
  background: none; color: inherit;
  font-size: 20px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.tetris-help { font-size: 13px; opacity: 0.7; margin: 0; text-align: center; }

@media (hover: none), (pointer: coarse) {
  .tetris-dpad { display: flex; }
}
@media (max-width: 560px) {
  .tetris-stage { flex-direction: column; align-items: center; }
  .tetris-side { flex-direction: row; order: -1; }
  .tetris-box canvas { width: 56px; height: 56px; }
  #board { height: min(58vh, 520px); }
}
@media (max-width: 726px) {
  /* 窄屏:顶栏让开左上角 fixed 的站点主题开关(z-index 999),否则「← 返回首页」
     的可点区被它盖住、点到会切主题(评审 I2);顺带把顶栏折成两行避免链接被挤断 */
  .tetris-page { padding-top: 38px; }
  .tetris-bar { flex-wrap: wrap; row-gap: 6px; }
  .tetris-back { white-space: nowrap; }
  .tetris-stats { order: 3; width: 100%; justify-content: center; }
}