:root {
  --tile-dark: #17303d;
  --tile-line: #c6d7da;
}
.tiles-shell {
  max-width: 740px;
  margin: auto;
  padding: 58px 42px 82px;
}
.tiles-intro {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.tiles-intro h1 {
  margin: 0;
  font: 600 clamp(3rem, 8vw, 5.8rem)/0.95 var(--serif);
  letter-spacing: -0.06em;
}
.tiles-intro p {
  margin: 17px 0 0;
  color: var(--muted);
  font-size: 15px;
}
.record-card,
.score-card {
  min-width: 142px;
  padding: 12px 15px;
  border: 1px solid var(--line);
  background: var(--surface);
  text-align: right;
}
.record-card span,
.score-card span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.11em;
}
.record-card b,
.score-card b {
  display: block;
  margin: 1px 0;
  color: var(--ink);
  font: 600 1.85rem/1.2 var(--serif);
}
.record-card small {
  display: block;
  min-height: 1.5em;
  color: var(--accent);
  font-size: 12px;
}
.tiles-game {
  width: min(100%, 390px);
  margin: 34px auto 0;
}
.tiles-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  margin-bottom: 14px;
}
.score-card {
  min-width: 128px;
  text-align: left;
}
.score-card b {
  font-size: 1.55rem;
}
button {
  cursor: pointer;
  border: 1px solid var(--accent);
  padding: 10px 16px;
  background: var(--accent);
  color: var(--on-accent);
  font: 600 13px var(--sans);
  letter-spacing: 0.04em;
}
button:hover {
  background: var(--accent);
}
button:focus-visible,
.tiles-board:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--line);
}
.ghost:hover {
  background: var(--panel);
  color: var(--ink);
}
.tiles-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px;
  padding: 3px;
  border: 1px solid var(--tile-line);
  background: var(--tile-line);
  touch-action: manipulation;
}
.tile-button {
  aspect-ratio: 1;
  border: 0;
  background: var(--surface);
  padding: 0;
}
.tile-button.dark {
  background: var(--tile-dark);
}
.tile-button.dark:hover {
  background: var(--accent);
}
.tile-button:disabled {
  cursor: default;
}
.game-status {
  min-height: 1.6em;
  margin: 12px 0 0;
  color: var(--accent);
  font-size: 13px;
}
.record-dialog {
  width: min(420px, calc(100% - 36px));
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 16px 42px color-mix(in srgb, var(--ink) 18%, transparent);
}
.record-dialog::backdrop {
  background: color-mix(in srgb, var(--ink) 35%, transparent);
}
.record-dialog form {
  padding: 29px;
}
.record-dialog h2 {
  margin: 0;
  font: 600 2rem/1.2 var(--serif);
}
.record-dialog p:not(.eyebrow):not(.record-error) {
  color: var(--muted);
  font-size: 14px;
}
.record-dialog label {
  display: block;
  margin-top: 21px;
  color: var(--muted);
  font-size: 13px;
}
.record-dialog input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 11px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font: 16px var(--sans);
}
.record-error {
  min-height: 1.4em;
  margin: 8px 0 0;
  color: var(--danger);
  font-size: 12px;
}
.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 9px;
  margin-top: 16px;
}
@media (max-width: 680px) {
  .tiles-shell {
    padding: 38px 20px 60px;
  }
  .tiles-intro {
    align-items: start;
    flex-direction: column;
    gap: 20px;
  }
  .record-card {
    text-align: left;
  }
  .tiles-game {
    margin-top: 28px;
  }
  .record-dialog form {
    padding: 24px;
  }
}
.tiles-board {
  position: relative;
  display: block;
  aspect-ratio: 4/5;
  overflow: hidden;
  padding: 0;
}
.tile-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px;
  padding: 3px;
  will-change: transform;
}
.tile-track .tile-button {
  min-width: 0;
}
.tile-button {
  transition: background 0.08s ease;
}
.tile-button.hit {
  background: var(--surface);
  pointer-events: none;
}
.tile-button.wrong {
  background: var(--danger-fill) !important;
  box-shadow: inset 0 0 0 2px var(--danger);
}
.game-actions {
  display: flex;
  gap: 8px;
}
.game-actions button {
  padding: 10px 12px;
}
.game-actions button:disabled {
  opacity: 0.5;
  cursor: default;
}
.tiles-board.is-paused::after {
  content: '已暂停';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  color: var(--ink);
  font: 600 24px var(--sans);
  pointer-events: none;
}