[hidden] { display: none !important; }
:root {
  --bg: #0d1716; --bg-2: #13211f; --card: #172826; --line: #2a403c; --ink: #e8f0ec; --muted: #93aba4;
  --accent: #f1d58a; --ok: #8fd3b9; --no: #ff8a8f; --hint: #ffb35c; --radius: 12px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--ink); font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif; }
small { display: block; font-size: 0.74em; font-weight: 400; line-height: 1.3; color: var(--muted); }
button { font: inherit; color: inherit; background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 7px 12px; cursor: pointer; line-height: 1.25; }
button:hover:not(:disabled) { border-color: #4e7a71; }
button:disabled { opacity: 0.4; cursor: default; }
button[aria-pressed="true"] { background: #e8f0ec; color: #0d1716; border-color: #e8f0ec; }
button[aria-pressed="true"] small { color: #3f5853; }
button.primary { background: var(--accent); color: #1c1a10; border-color: var(--accent); font-weight: 600; }
button.primary small { color: #5b5133; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.muted { color: var(--muted); }

.top { height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 18px; border-bottom: 1px solid var(--line); }
.kicker { font-size: 12px; color: var(--muted); display: flex; gap: 6px; align-items: baseline; }
.kicker small { display: inline; }
h1 { margin: 2px 0 0; font-size: 19px; font-weight: 650; display: flex; gap: 10px; align-items: baseline; }
h1 small { display: inline; font-size: 12px; }
.top-actions { display: flex; gap: 10px; align-items: center; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 11px; padding: 2px; background: var(--bg-2); }
.seg button { border: 0; background: transparent; border-radius: 9px; padding: 5px 12px; font-size: 13px; white-space: nowrap; }
.seg button[aria-pressed="true"] { background: #e8f0ec; color: #0d1716; }
.modes button { min-width: 84px; font-size: 14px; }
.toplink { color: var(--ink); text-decoration: none; font-size: 13px; border: 1px solid var(--line); border-radius: 10px; padding: 5px 10px; text-align: center; }

main { height: calc(100dvh - 64px); display: grid; grid-template-columns: 240px minmax(0, 1fr) 330px; }
.list-btn { display: none; }
body.quizzing main { grid-template-columns: 0 minmax(0, 1fr) 340px; }
body.quizzing .side { visibility: hidden; }

.side { border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; padding: 12px; gap: 10px; }
#search { width: 100%; font: inherit; font-size: 14px; color: var(--ink); background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; }
.layers { display: flex; flex-wrap: wrap; gap: 5px; }
.layers button { font-size: 12px; padding: 4px 8px; border-radius: 8px; display: flex; gap: 5px; align-items: center; }
.layers i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.list { overflow: auto; min-height: 0; flex: 1; display: grid; align-content: start; gap: 2px; }
.list h3 { margin: 10px 0 3px; font-size: 12px; color: var(--muted); font-weight: 600; }
.list button { text-align: left; border: 0; background: transparent; padding: 5px 8px; border-radius: 8px; font-size: 14px; display: flex; justify-content: space-between; gap: 6px; align-items: baseline; }
.list button small { display: inline; font-size: 11px; }
.list button:hover { background: var(--bg-2); }
.list button.on { background: #3a3420; color: var(--accent); }
.badge { font-size: 10px; border: 1px solid #5b5133; color: var(--accent); border-radius: 5px; padding: 0 4px; white-space: nowrap; }
.badge.s { border-color: #4e6a8a; color: #a9c6ea; }
.badge.approx { border-color: #6a5a4a; color: #e9c8a6; }

.viewer { position: relative; min-height: 0; overflow: hidden; background: radial-gradient(ellipse at 50% 42%, #1c302d 0%, #0d1716 70%); }
#stage, #stage canvas, #labels { position: absolute; inset: 0; width: 100%; height: 100%; }
#stage canvas { touch-action: none; }
#labels { pointer-events: none; }
#labels svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
#labels line { stroke: #cfe0da; stroke-width: 1; opacity: 0.6; }
#labels circle { fill: #f4f8f6; }
.tag { position: absolute; left: 0; top: 0; font-size: 13px; font-weight: 600; background: #0d1716e0; border: 1px solid var(--accent); border-radius: 7px; padding: 3px 8px; white-space: nowrap; text-align: center; }
.tag small { font-size: 10px; }
.tag.pin { border-color: var(--hint); color: #ffe2bf; }
.tag.flash-ok { border-color: var(--ok); }
.tag.flash-no { border-color: var(--no); color: #ffd9da; }
.view-bar { position: absolute; top: 12px; left: 12px; display: flex; gap: 5px; flex-wrap: wrap; z-index: 2; max-width: calc(100% - 24px); }
.view-bar button { font-size: 12px; padding: 4px 9px; background: #13211fe6; }
.view-bar button[aria-pressed="true"] { background: #e8f0ec; color: #0d1716; }
.hemi { position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%); z-index: 2; background: #13211fe6; }
.gizmo { position: absolute; right: 14px; bottom: 14px; width: 92px; height: 92px; border-radius: 50%; background: #0d1716b3; border: 1px solid var(--line); z-index: 2; }
.gizmo span { position: absolute; font-size: 12px; font-weight: 650; transform: translate(-50%, -50%); }
.gizmo span.back { opacity: 0.4; font-weight: 400; }
.facing { position: absolute; right: 116px; bottom: 18px; margin: 0; font-size: 12px; color: var(--muted); text-align: right; z-index: 2; }
.facing b { color: var(--ink); font-weight: 600; }
.loading { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; font-size: 15px; background: #0d1716cc; z-index: 5; }

.quiz { background: #1d302d; border: 1px solid #4e7a71; border-radius: 14px; padding: 12px 16px; }
.quiz .qhead { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); }
.quiz .qtext { font-size: 17px; font-weight: 600; margin: 6px 0 4px; line-height: 1.5; }
.quiz .qtext small { font-size: 12px; font-weight: 400; }
.quiz .fb { margin: 8px 0 0; font-size: 14px; line-height: 1.55; }
.quiz .fb.ok { color: var(--ok); } .quiz .fb.no { color: var(--no); } .quiz .fb.hint { color: var(--hint); }
.quiz .fb small { color: inherit; opacity: 0.8; }
.quiz .opts { display: grid; gap: 6px; margin-top: 8px; }
.quiz .opts button { text-align: left; }
.quiz .opts button.right { border-color: var(--ok); background: #183229; }
.quiz .opts button.wrong { border-color: var(--no); background: #2e1a1c; }
.quiz .row { display: flex; gap: 8px; justify-content: flex-end; margin-top: 10px; flex-wrap: wrap; }
.quiz .pick2 { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.quiz .pick2 button { flex: 1; min-width: 110px; }
.quiz ul { margin: 6px 0 0; padding-left: 18px; font-size: 14px; line-height: 1.7; }
.quiz ul button { border: 0; background: none; padding: 0; color: var(--accent); text-decoration: underline; cursor: pointer; }

.panel { border-left: 1px solid var(--line); overflow: auto; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.eyebrow { margin: 0 0 6px; font-size: 12px; color: var(--muted); font-weight: 600; }
.card h2 { margin: 0 0 4px; font-size: 21px; }
.card h2 small { font-size: 13px; }
.card .badges { display: flex; gap: 5px; flex-wrap: wrap; margin: 6px 0 10px; }
.card .sect { margin: 10px 0 0; }
.card .sect b { display: block; font-size: 12px; color: var(--muted); font-weight: 600; margin-bottom: 2px; }
.card .sect p { margin: 0; line-height: 1.6; font-size: 15px; }
.card .sect.confuse p { color: #ffe2bf; }
.card .chips { display: flex; gap: 5px; flex-wrap: wrap; }
.card .chips button { font-size: 12px; padding: 3px 8px; }
.card .acts { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 12px; }
.card .acts button, .card .acts a { font-size: 13px; padding: 6px 10px; }
.card .lab { display: inline-block; color: #1c1a10; background: var(--accent); border-radius: 10px; text-decoration: none; font-weight: 600; }
.card .lab small { color: #5b5133; }
.credit { font-size: 11px; color: var(--muted); margin: 0; line-height: 1.5; }

@media (max-width: 1200px) {
  main, body.quizzing main { grid-template-columns: minmax(0, 1fr) 320px; }
  .side { position: fixed; left: 0; top: 64px; bottom: 0; width: 270px; z-index: 6; background: var(--bg); transform: translateX(-102%); transition: transform 0.2s; box-shadow: 4px 0 20px #0008; }
  body.list-open .side { transform: none; }
  .list-btn { display: inline-block; border-color: var(--accent) !important; }
}
@media (max-width: 980px) {
  main { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(0, 1fr) auto; height: auto; min-height: calc(100dvh - 64px); }
  main, body.quizzing main { grid-template-columns: minmax(0, 1fr); }
  .viewer { height: 62dvh; }
  body.quizzing .viewer { height: 48dvh; }
  .panel { border-left: 0; border-top: 1px solid var(--line); }
  .top { height: auto; flex-wrap: wrap; padding: 8px 12px; }
  .modes button { min-width: 0; }
  .facing { display: none; }
  .gizmo { width: 66px; height: 66px; bottom: 62px; right: 10px; }
  .gizmo span { font-size: 11px; }
}
body.quizzing .list-btn { display: none !important; }

/* 病例页 */
.case-tabs { display: flex; gap: 6px; margin: 8px 0 4px; flex-wrap: wrap; }
.case-tabs button { flex: 1; min-width: 90px; font-size: 13px; }
.case-tabs button[aria-pressed="true"] { background: #e8f0ec; color: #0d1716; }
.quiz .opts.types button { display: flex; align-items: center; gap: 8px; }
.quiz .opts.types button[aria-pressed="true"], .quiz .opts.checks button[aria-pressed="true"] { border-color: var(--accent); background: #183229; color: var(--ink); }
.quiz .opts.checks button.right { border-color: var(--ok); } .quiz .opts.checks button.wrong { border-color: var(--no); }
.quiz .opts.types i { width: 12px; height: 12px; border-radius: 50%; flex: none; }
.quiz .opts.checks button { display: flex; align-items: flex-start; gap: 8px; }
.quiz .opts.checks .box { width: 18px; height: 18px; border: 1px solid var(--line); border-radius: 4px; flex: none; text-align: center; line-height: 16px; font-size: 13px; }
.quiz .fb.muted { color: var(--muted); font-size: 13px; }
.quiz .fb.senior { border-left: 3px solid #c9b8f0; padding-left: 8px; }
.quiz ul.outcomes { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 6px; }
.quiz ul.outcomes li { background: #0f1d1b; border: 1px solid var(--line); border-radius: 10px; padding: 6px 10px; font-size: 14px; line-height: 1.5; }
.quiz ul.outcomes li b { display: inline-block; min-width: 54px; margin-right: 6px; }
.quiz ul.outcomes li.ok b { color: var(--ok); } .quiz ul.outcomes li.no b { color: var(--no); }
.quiz input[type=range] { width: 100%; margin: 10px 0 2px; }
.quiz .ticks { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); }
.quiz .ticks span.on { color: var(--ink); font-weight: 600; }

.case-pick { display: flex; gap: 6px; margin-bottom: 6px; flex-wrap: wrap; }
.case-pick button { flex: 1; min-width: 120px; font-size: 13px; }
.case-pick button[aria-pressed="true"] { background: #e8f0ec; color: #0d1716; }
.quiz .pick2 button[aria-pressed="true"] { border-color: var(--accent); background: #183229; color: var(--ink); }
.quiz .opts button[aria-pressed="true"] { border-color: var(--accent); background: #183229; color: var(--ink); }
.stroke-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 8px; align-items: end; }
.stroke-panel figure { margin: 0; text-align: center; font-size: 12px; }
.stroke-panel svg { width: 100%; height: auto; display: block; background: #0f1d1b; border-radius: 10px; }
.stroke-panel figcaption small { display: block; font-size: 10px; color: var(--muted); }
.quiz .row.left { justify-content: flex-start; }
.quiz a.lab { display: inline-block; padding: 6px 10px; border: 1px solid var(--line); border-radius: 10px; color: var(--accent); text-decoration: none; font-size: 13px; }
.quiz a.lab small { display: block; font-size: 10px; color: var(--muted); }
.sect-after { margin-top: 10px; border-top: 1px solid var(--line); padding-top: 6px; }
.sect-ct { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 6px; }
.quiz ul.outcomes li .ab { display: block; font-weight: 600; margin-bottom: 2px; }

/* 从学习页/练习题点进来时，顶栏左上的小标题换成“回到刚才的课/题目”（../pathways/backlink.js） */
.kicker .backlink { padding: 1px 9px; font-size: 12px; border-radius: 8px; }
.kicker .backlink small { color: #5b5133; }

/* 2026-10-03：中英切换（与通路实验室、学习页共用开关，见 ../pathways/lang.js）。结构名称（.dual）中英都显示 */
html[data-lang="zh"] small.en { display: none !important; }
html[data-lang="en"] .zh { display: none !important; }
html[data-lang="en"] small.en { display: inline; font-size: inherit; color: inherit; letter-spacing: 0; margin: 0; }
html[data-lang] .dual .zh { display: inline !important; }
html[data-lang] .dual small.en { display: block !important; font-size: 0.74em; color: var(--muted); }
.list.dual button small.en { display: inline !important; margin-left: 6px; }
.lang { font-size: 13px; padding: 5px 12px; }

/* 2026-10-03（续）：结构列表整体是 .dual（名称中英都显示），里面的分组标题、徽章、“没有找到”加 .solo，跟着开关只显示一种语言 */
html[data-lang="en"] .dual .solo .zh { display: none !important; }
html[data-lang="zh"] .dual .solo small.en, html[data-lang="zh"] .list.dual button .solo small.en { display: none !important; }
html[data-lang="en"] .dual .solo small.en, html[data-lang="en"] .list.dual button .solo small.en { display: inline !important; font-size: inherit; color: inherit; margin: 0; }
.badge small { display: inline; font-size: inherit; color: inherit; }
.layers button small { display: inline; font-size: inherit; color: inherit; }
.qhead small { display: inline; font-size: inherit; color: inherit; }
.card .sect b small { display: inline; font-size: inherit; color: inherit; }
.quiz ul.outcomes li b small { display: inline; font-size: inherit; color: inherit; }
.card .chips button small, .quiz ul.dual button small { font-size: 10px; }
html[data-lang="en"] .gizmo span { font-size: 10px; }
@media (max-width: 980px) { html[data-lang="en"] .gizmo span { font-size: 9px; } }

/* 2026-10-06：阿尔茨海默病病例（情况单选题、神经元小图、和 H.M. 对照表） */
.sit { margin-top: 10px; }
.quiz .sit-opts button:disabled { opacity: 1; }
.quiz .sit-opts button.other { color: var(--muted); }
.ad-fig { margin: 10px 0 0; }
.ad-fig svg { width: 100%; height: auto; display: block; background: #0f1d1b; border-radius: 10px; }
.ad-fig figcaption { font-size: 12px; color: var(--muted); text-align: center; margin-top: 3px; }
.ad-fig figcaption small { display: block; font-size: 10px; }
.quiz table.cmp { width: 100%; border-collapse: collapse; margin-top: 6px; font-size: 13px; line-height: 1.4; table-layout: fixed; }
.quiz table.cmp th, .quiz table.cmp td { border: 1px solid var(--line); padding: 5px 6px; vertical-align: top; text-align: left; overflow-wrap: anywhere; }
.quiz table.cmp thead th { background: #0f1d1b; font-weight: 600; }
.quiz table.cmp tbody th { width: 26%; font-weight: 600; color: var(--muted); }
.quiz table.cmp small { font-size: 11px; }
.quiz .sit-opts button.right, .quiz .sit-opts button.right[aria-pressed="true"] { border-color: var(--ok); background: #183229; color: var(--ink); }
.quiz .sit-opts button.wrong, .quiz .sit-opts button.wrong[aria-pressed="true"] { border-color: var(--no); background: #2e1a1c; color: var(--ink); }