/* Deliberate hierarchy: gold actions, quiet tools, and a persistent rating state. */
button[data-button-kind] { display:inline-flex;align-items:center;justify-content:center;gap:.6rem;min-height:44px;position:relative; }
.button-label { min-width:0; }
.button-symbol { display:inline-grid;place-items:center;flex:0 0 20px;width:20px;height:20px;pointer-events:none;transform-origin:center; }
.button-symbol svg { width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round; }
button[data-button-kind="back"] .button-symbol svg { transform:rotate(180deg); }
.button-direction { font-size:1.15rem;line-height:1; }
button[data-button-kind="arrow"] .button-symbol { margin-left:auto;transition:transform 180ms var(--ua-ease); }
button[data-button-kind="back"] .button-symbol { transition:transform 180ms var(--ua-ease); }
button.primary[data-button-kind] { border:1px solid #c6a900;background:var(--ua-gold);color:var(--ua-ink);box-shadow:0 2px 3px #66571826,inset 0 1px #fff5a3;transition:background-color var(--ua-fast),box-shadow var(--ua-fast),transform var(--ua-fast) var(--ua-ease); }
button.primary[data-button-kind]:active:not(:disabled) { transform:translateY(1px);box-shadow:inset 0 1px 3px #66571826; }
#reveal-answer .button-symbol { width:28px;height:28px;flex-basis:28px;border-radius:50%;background:#fff8ca7a; }
#quiz-hint { border:1px solid #b7c3a9;background:#f3f4e9;color:var(--ua-green); }
#quiz-hint[aria-expanded="true"] { border-color:var(--ua-green);background:#e8eedf; }
#quiz-hint[aria-expanded="true"] .button-symbol { color:#655613; }
#hint-area .hint-note { margin:.85rem 0 0;padding:1rem 1.1rem;background:#fcf6d9;border:1px solid #d5c88e;border-radius:3px;color:var(--ua-ink);font-size:1rem;line-height:1.55; }
.station-decision .self-mark { display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;background:#e8edde;border:1px solid #bdcbb0;border-radius:6px;isolation:isolate;position:relative; }
.station-decision .self-mark::before { content:'';position:absolute;z-index:-1;left:4px;top:4px;bottom:4px;width:calc(50% - 6px);background:var(--ua-green);border-radius:3px;opacity:0;transition:transform 240ms var(--ua-ease),opacity var(--ua-fast); }
.station-decision .self-mark:has(#mark-again[aria-pressed="true"])::before { opacity:1;transform:translateX(0); }
.station-decision .self-mark:has(#mark-good[aria-pressed="true"])::before { opacity:1;transform:translateX(calc(100% + 4px)); }
.station-decision .self-mark button { min-width:0;width:100%;margin:0;min-height:48px;border:0;border-radius:3px;background:transparent;box-shadow:none;color:var(--ua-green);font-size:.875rem;line-height:1.3;padding:.65rem .6rem;transition:color 140ms; }
.station-decision .self-mark button[aria-pressed="true"] { color:#fffefa;background:var(--ua-green); }
@supports selector(:has(*)) { .station-decision .self-mark button[aria-pressed="true"] { background:transparent; } }
.station-decision .self-mark button:active { transform:none; }
.station-decision .self-mark button:focus-visible { outline:2px solid var(--ua-green);outline-offset:5px; }
.station-decision .self-mark button[aria-pressed="true"]:focus-visible { outline-color:#778d61; }
.rating-feedback { flex:1 1 100%;margin:0!important;min-height:1.4em;font-size:.8125rem!important;color:var(--ua-green); }
.rating-feedback[data-rating="none"] { color:var(--ua-muted); }
.station-decision #next-question { justify-content:space-between; }
.station-utilities #shuffle-questions { border:0;padding-left:0;color:var(--ua-green); }
#return-explore { justify-content:flex-start;border:1px solid var(--ua-line);background:transparent; }
#walk-check[data-button-kind] { gap:.3rem; }
#walk-check .button-symbol { width:16px;flex-basis:16px; }
#walk-check .button-symbol svg { width:16px;height:16px; }
#anatomy-view #pan-button[aria-pressed="true"] { background:var(--ua-gold);color:var(--ua-ink);box-shadow:inset 0 1px #fff5a3; }
#anatomy-view .camera-actions button[data-button-kind] { gap:.35rem; }
#anatomy-view .camera-actions .button-symbol { flex-basis:17px;width:17px; }
#anatomy-view .camera-actions .button-symbol svg { width:17px;height:17px; }
#anatomy-view .camera-bar button:disabled { color:#a7b8aa;opacity:.6;cursor:default; }
/* Disclosure indicators are an outline that opens, not an unrelated +/- swap. */
:is(.lesson-details,.quiz-options,.answer-explanation,.answer-sources)>summary { list-style:none;display:flex;align-items:center;gap:.65rem;min-height:44px; }
:is(.lesson-details,.quiz-options,.answer-explanation,.answer-sources)>summary::-webkit-details-marker { display:none; }
:is(.lesson-details,.quiz-options,.answer-explanation,.answer-sources)>summary::before { content:'';width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(-45deg);transition:transform 200ms var(--ua-ease);flex:0 0 7px;margin-right:3px; }
:is(.lesson-details,.quiz-options,.answer-explanation,.answer-sources)[open]>summary::before { transform:rotate(45deg); }
@media(hover:hover) and (pointer:fine) {
 button[data-button-kind="arrow"]:hover:not(:disabled) .button-symbol { transform:translateX(3px); }
 button[data-button-kind="back"]:hover:not(:disabled) .button-symbol { transform:translateX(-3px); }
 button.primary[data-button-kind]:hover:not(:disabled) { background:#ffda11;box-shadow:0 3px 7px #66571830,inset 0 1px #fff5a3; }
 .self-mark button:not([aria-pressed="true"]):hover { color:#173c23;background:#dbe4ce; }
 #quiz-hint:hover { background:#e7eddf; }
}
@media(max-width:400px) {
 .station-decision .self-mark button { padding:.6rem .35rem;font-size:.8125rem;gap:.35rem; }
 .guided-learning #walk-check .button-symbol { display:none; }
 .guided-learning #walk-next .button-symbol { flex-basis:16px;width:16px; }
 .guided-learning #walk-next[data-button-kind] { gap:.3rem; }
}
.keyboard-input .button-symbol,.keyboard-input .self-mark::before,.keyboard-input button[data-button-kind],.keyboard-input summary::before { transition:none!important; }
@media(prefers-reduced-motion:reduce) {
 .button-symbol,.self-mark::before,button[data-button-kind],summary::before { transition:none!important; }
 button[data-button-kind]:hover .button-symbol,button.primary[data-button-kind]:active { transform:none!important; }
}