/* Step 27 — the course. */
.learn { max-width: 900px; margin: 0 auto; padding: 24px 16px 60px; line-height: 1.6; }
.learn-eyebrow { font: 600 .78rem system-ui, sans-serif; letter-spacing: .14em; text-transform: uppercase; color: var(--indigo, #2C4A63); margin: 0; }
.learn h1 { font-size: 2rem; line-height: 1.2; margin: 6px 0 10px; }
.learn-lede { color: var(--ink-soft, #5C5040); max-width: 68ch; }
.learn-crumbs { font-size: .9rem; color: var(--ink-soft, #5C5040); margin: 0 0 4px; }
.learn-unit__jp { font-size: .7em; color: var(--seal, #A3382A); margin-left: 6px; font-weight: 400; }
.learn-units { list-style: none; padding: 0; counter-reset: unit; }
.learn-unit { background: #fffaf0; border: 1px solid var(--paper-edge, #D8C48C); border-radius: 12px; padding: 14px 18px; margin: 0 0 14px; }
.learn-unit h2 { margin: 0 0 4px; font-size: 1.3rem; }
.learn-unit__n { display: inline-block; width: 1.6em; height: 1.6em; line-height: 1.6em; text-align: center; border-radius: 50%;
  background: var(--seal, #A3382A); color: #fff; font: 700 .9rem system-ui, sans-serif; vertical-align: .15em; }
.learn-unit > p { margin: 0 0 6px; color: var(--ink-soft, #5C5040); }
.learn-lessons { margin: 0; padding-left: 1.4em; columns: 2 260px; }
.learn-lessons li { break-inside: avoid; }
.learn-lessons li.is-done a { color: #2F7D4F; }
.learn-check { color: #2F7D4F; font-weight: 700; margin-left: 4px; }
.learn-lessons--big { columns: 1; }
.learn-lessons--big li { margin: 0 0 12px; }
.learn-lessons--big p { margin: 2px 0 0; color: var(--ink-soft, #5C5040); }
.learn-progress-summary { font: 600 .95rem system-ui, sans-serif; color: #2F7D4F; }

.lesson-body h2 { margin-top: 28px; }
.lesson-body code { background: #F3E3B4; padding: 0 4px; border-radius: 4px; }
.lesson-note { background: #EEF2F6; border-left: 4px solid var(--indigo, #2C4A63); padding: 8px 12px; border-radius: 6px; margin: 12px 0; }
.lesson-table { border-collapse: collapse; margin: 10px 0; }
.lesson-table th, .lesson-table td { border: 1px solid #C9A66B; padding: 4px 10px; text-align: left; }
a.gloss { border-bottom: 1px dotted currentColor; text-decoration: none; }

.lesson-board, .lesson-exercise { margin: 18px 0; }
.lesson-board__view { height: min(62vh, 440px); max-width: 560px; }
.lesson-board__view .pos-svg { width: 100%; height: 100%; display: block; }
.lesson-board figcaption, .lesson-exercise figcaption { color: var(--ink-soft, #5C5040); font-size: .95rem; margin-top: 6px; max-width: 560px; }
.lesson-board__reset { margin-top: 6px; padding: 3px 10px; border-radius: 6px; border: 1px solid #7A5630; background: #fff8e6; cursor: pointer; }
.lesson-exercise { background: #fffaf0; border: 2px solid #C9A66B; border-radius: 12px; padding: 12px 14px; max-width: 600px; }
.lesson-exercise.is-complete { border-color: #2F7D4F; }
.lesson-exercise__prompt { margin: 0 0 6px; }
.lesson-exercise__status { min-height: 1.6em; margin: 4px 0; font-weight: 600; }
.lesson-exercise__status.is-ok { color: #2F7D4F; }
.lesson-exercise__status.is-bad { color: #A3382A; }
.lesson-exercise__actions { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; font-size: .9rem; margin: 0 0 8px; }
.lesson-exercise__actions button { padding: 3px 10px; border-radius: 6px; border: 1px solid #7A5630; background: #fff8e6; cursor: pointer; }
.lesson-exercise.is-shaking { animation: lesson-shake .35s ease; }
@keyframes lesson-shake { 25% { transform: translateX(-5px); } 50% { transform: translateX(5px); } 75% { transform: translateX(-3px); } }
@media (prefers-reduced-motion: reduce) { .lesson-exercise.is-shaking { animation: none; } }

.lesson-done { margin: 24px 0; padding: 12px 16px; background: #DDEBD3; border-radius: 10px; }
.lesson-next-unit { margin: 20px 0; padding: 14px 18px; background: var(--paper-deep, #E7D8AF); border-radius: 12px; }
.lesson-next-unit h2 { margin: 0 0 4px; }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.glossary__entry { border-bottom: 1px solid #eadfc4; padding: 10px 0; }
.glossary dt { font-weight: 700; font-size: 1.1rem; }
.glossary dt span { color: var(--seal, #A3382A); margin-left: 8px; font-weight: 400; }
.glossary dd { margin: 4px 0 0; }
.glossary__first { font-size: .9rem; color: var(--ink-soft, #5C5040); }
@media (orientation: portrait) { .lesson-board__view { height: auto; } }

/* The castle reference (/learn/castles). */
.learn.castles { max-width: 1120px; }
.castles-intro { color: var(--ink-soft, #5C5040); max-width: 72ch; }
.castle-picker { display: flex; flex-wrap: wrap; gap: 8px 28px; margin: 14px 0 18px; }
.castle-picker__title { font: 600 .78rem system-ui, sans-serif; letter-spacing: .12em; text-transform: uppercase;
  color: var(--indigo, #2C4A63); margin: 0 0 6px; }
.castle-picker__title span { letter-spacing: 0; text-transform: none; margin-left: 4px; }
.castle-picker ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.castle-picker a { display: inline-block; padding: 5px 12px; border-radius: 999px; border: 1px solid var(--paper-edge, #D8C48C);
  background: #fffaf0; color: var(--ink, #2A2118); text-decoration: none; font-size: .95rem; line-height: 1.3; }
.castle-picker a span { color: var(--seal, #A3382A); font-size: .85em; margin-left: 2px; }
.castle-picker a:hover { border-color: var(--seal, #A3382A); }
.castle-picker a[aria-current="page"] { background: var(--ink, #2A2118); color: #fff; border-color: var(--ink, #2A2118); }
.castle-picker a[aria-current="page"] span { color: #F3C9B8; }

.castle { display: grid; grid-template-columns: minmax(0, 560px) minmax(0, 1fr); gap: 24px; align-items: start; }
.castle__board { position: sticky; top: 12px; }
.castle__view { height: min(66vh, 520px); max-width: 560px; }
.castle__view .pos-svg { width: 100%; height: 100%; display: block; }
.castle__controls { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 8px; max-width: 560px; }
.castle__controls button { min-width: 48px; min-height: 44px; font-size: 1.1rem; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--wood-line, #7A5630); background: #fff8e6; color: var(--ink, #2A2118); }
.castle__controls button[data-step="next"] { background: var(--ink, #2A2118); color: #fff; border-color: var(--ink, #2A2118); min-width: 64px; }
.castle__controls button:disabled { opacity: .35; cursor: default; }
.castle__counter { min-width: 8.5em; text-align: center; font: 600 .95rem system-ui, sans-serif; color: var(--ink-soft, #5C5040); }
.castle__hint { font-size: .85rem; color: var(--ink-soft, #5C5040); text-align: center; margin: 6px 0 0; max-width: 560px; }
.castle__hint label { white-space: nowrap; margin-left: 6px; }

.castle__info h2 { margin: 0; font-size: 1.6rem; }
.castle__info h2 span { color: var(--seal, #A3382A); font-size: .75em; margin-left: 6px; font-weight: 400; }
.castle__reading { margin: 0 0 10px; color: var(--ink-soft, #5C5040); font-style: italic; }
.castle__now { background: #fffaf0; border: 2px solid #C9A66B; border-radius: 12px; padding: 10px 14px; margin: 0 0 12px; min-height: 5.2em; }
.castle__move { margin: 0; font-size: 1.35rem; }
.castle__jp { font-weight: 700; }
.castle__west { font: 500 .8rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; color: var(--ink-soft, #5C5040); margin-left: 6px; }
.castle__note { margin: 2px 0 0; }
.castle__traits { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 10px 0; }
.castle__traits dt { font-weight: 700; }
.castle__traits dd { margin: 0; }
.castle__builds { font-size: .95rem; }
.castle__info h3 { margin: 16px 0 6px; font-size: 1.05rem; }
.castle__moves { margin: 0; padding: 0 0 0 2.2em; max-height: 360px; overflow: auto; position: relative; }
.castle__moves li { padding: 3px 0; }
.castle__moves button { font: inherit; background: none; border: 0; padding: 1px 4px; border-radius: 6px; cursor: pointer; color: var(--ink, #2A2118); }
.castle__moves button:hover { background: #F3E3B4; }
.castle__moves li.is-done { color: var(--ink-soft, #5C5040); }
.castle__moves li.is-current button { background: var(--ink, #2A2118); color: #fff; }
.castle__moves li.is-current .castle__west { color: #E7D8AF; }
.castle__movenote { display: block; font-size: .88rem; color: var(--ink-soft, #5C5040); padding-left: 4px; }
.castle__moves li:not(.is-current) .castle__movenote { display: none; }
.castle__moves:not(.is-live) li .castle__movenote { display: block; }
.castles-more { margin-top: 28px; color: var(--ink-soft, #5C5040); }

@media (max-width: 820px) {
  .castle { grid-template-columns: 1fr; gap: 14px; }
  .castle__board { position: static; }
  .castle__view { height: auto; }
  .castle__moves { max-height: none; }
  .castle-picker { gap: 8px 18px; }
}
.learn-reference { background: var(--paper-deep, #E7D8AF); border-radius: 12px; padding: 10px 16px; margin: 0 0 16px; }
.learn-reference p { margin: 2px 0; }
/* No captures in a castle build: drop the empty piece stands so the board gets the room. */
.castle__view .sb-hand { display: none; }
.castle__view .sb-root { grid-template-columns: auto; }
.castle__board .castle__now { margin: 10px 0 0; max-width: 560px; }