.warmup-page { max-width: 960px; margin-inline: auto; }
.warmup-exercise { display: grid; grid-template-columns: minmax(0, 320px) minmax(0, 1fr); gap: 40px; padding-block: 36px; border-top: 1px solid var(--border); align-items: start; }
.warmup-board-figure { margin: 0; }
.warmup-board { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; padding: 10px; background: #101e29; border: 1px solid #547384; border-radius: 8px; }
.warmup-cell { position: relative; aspect-ratio: 1; background: #0a121a; border-radius: 4px; }
.warmup-coordinate { position: absolute; top: 4px; left: 5px; color: #afbbc7; font-size: 11px; line-height: 1; }
.warmup-ring { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); border: 4px solid currentColor; border-radius: 50%; aspect-ratio: 1; box-sizing: border-box; box-shadow: inset 0 1px 0 #ffffff40; }
.warmup-ring.ring-small { width: 27%; }
.warmup-ring.ring-medium { width: 49%; }
.warmup-ring.ring-large { width: 72%; }
.warmup-ring.color-0 { color: #ff3366; }
.warmup-ring.color-1 { color: #16e876; }
.warmup-ring.color-2 { color: #24a8ff; }
.warmup-ring.color-3 { color: #ffd02e; }
.warmup-board-figure figcaption { margin-top: 8px; color: var(--soft); font-size: 13px; }
.warmup-incoming { display: flex; gap: 16px; align-items: center; margin-top: 8px; }
.warmup-piece { position: relative; width: 88px; height: 88px; flex: 0 0 88px; }
.warmup-incoming p { margin: 0; font-size: 14px; line-height: 1.6; }
.warmup-question h2 { font-size: 24px; line-height: 1.3; margin: 8px 0 16px; }
.warmup-question p, .warmup-finish p { line-height: 1.7; }
.warmup-answer { margin-top: 20px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.warmup-answer summary { padding: 14px 4px; min-height: 48px; cursor: pointer; color: #ffd44b; font-weight: 750; }
.warmup-answer[open] { padding-bottom: 18px; }
.warmup-answer a { padding-block: 8px; }
.warmup-answer summary:focus-visible { outline: 2px solid #ffd44b; outline-offset: 4px; }
.warmup-finish { border-top: 1px solid var(--border); padding-block: 28px; }
.warmup-sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
@media (max-width: 640px) {
  .warmup-exercise { grid-template-columns: minmax(0, 1fr); gap: 12px; padding-block: 28px; }
  .warmup-visual { width: min(100%, 320px); margin-inline: auto; }
  .warmup-question h2 { font-size: 22px; }
}