.study-full-page {
  --bg2: var(--bg-alt);
  --panel2: var(--panel-2);
  --muted: var(--text-dim);
  --dim: var(--text-muted);
  --on-accent: var(--bg);
  --accent-press: var(--accent-bright);
  --r-ctl: var(--r-control);
  --image-bg: var(--image-stage);
  --overlay: color-mix(in srgb, var(--image-stage) 76%, transparent);
  min-height: 100vh;
  overflow-wrap: anywhere;
}

.study-full-page .site-head-in { width: min(1180px, calc(100% - 40px)); }
.study-head-actions { display: flex; align-items: center; gap: 14px; }
.head-link { color: var(--text-dim); font-size: 12.5px; text-decoration: none; }
.head-link:hover { color: var(--accent-bright); }
.study-full-root { min-height: calc(100vh - 62px); }
.study-loading { min-height: 70vh; display: grid; place-content: center; justify-items: center; gap: 8px; color: var(--text-muted); }
.study-loading span { color: var(--accent); font: 700 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .18em; }
.study-loading strong { color: var(--text-dim); font-size: 17px; }

.study-full-hub { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 62px 0 100px; }
.study-hub-hero { max-width: 800px; margin-bottom: 38px; }
.study-hub-hero h1 { max-width: 760px; }
.study-hub-hero .promise { max-width: 720px; }
.study-course-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.study-course-actions .btn { text-decoration: none; }
.study-hub-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 28px 0 36px; }
.study-hub-stat { padding: 16px 18px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-control); }
.study-hub-stat strong { display: block; color: var(--accent-bright); font: 700 25px/1.2 "SFMono-Regular", Consolas, monospace; }
.study-hub-stat span { display: block; margin-top: 5px; color: var(--text-muted); font: 600 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .1em; text-transform: uppercase; }
.study-hub-tools { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin: 42px 0 18px; }
.study-hub-tools h2 { margin: 0; }
.study-search { width: min(340px, 100%); min-height: 42px; padding: 9px 12px; color: var(--text); background: var(--panel); border: 1px solid var(--border-strong); border-radius: var(--r-control); }
.study-search:focus-visible { outline: none; box-shadow: var(--focus); border-color: var(--accent); }
.study-module-groups { display: grid; gap: 42px; }
.study-module-group > header { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 15px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.study-module-group > header h2 { margin: 0; font-size: 25px; }
.study-module-group > header span { color: var(--text-muted); font: 600 11px/1.4 "SFMono-Regular", Consolas, monospace; }
.study-module-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.study-module-card { min-width: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 15px; padding: 18px 19px; color: inherit; text-decoration: none; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-panel); transition: border-color .18s ease, transform .18s ease; }
.study-module-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.study-module-card:focus-visible { outline: none; box-shadow: var(--focus); }
.study-module-code { min-width: 52px; padding-top: 2px; color: var(--accent); font: 700 12px/1.4 "SFMono-Regular", Consolas, monospace; }
.study-module-card h3 { margin: 0 0 6px; color: var(--text); }
.study-module-card p { margin: 0; color: var(--text-dim); font-size: 13.5px; line-height: 1.65; }
.study-module-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.study-module-meta span { padding: 3px 8px; color: var(--text-muted); border: 1px solid var(--border); border-radius: 999px; font: 600 10px/1.35 "SFMono-Regular", Consolas, monospace; }
.study-module-meta .done { color: var(--good); border-color: color-mix(in srgb, var(--good) 38%, var(--border)); }
.study-empty { padding: 44px 20px; color: var(--text-muted); text-align: center; border: 1px dashed var(--border-strong); border-radius: var(--r-panel); }

.study-full-chapter { width: min(760px, calc(100% - 40px)); margin: 0 auto; padding: 50px 0 104px; }
.study-chapter-hero { margin-bottom: 62px; }
.study-chapter-hero h1 { margin-top: 10px; }
.study-chapter-hero .promise { margin-top: 10px; }
.study-chapter-meta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 22px; }
.study-chip { padding: 4px 9px; color: var(--text-muted); border: 1px solid var(--border); border-radius: 999px; font: 600 10px/1.35 "SFMono-Regular", Consolas, monospace; }
.study-chip.on { color: var(--good); border-color: color-mix(in srgb, var(--good) 35%, var(--border)); }
.study-lens-toggle { background: transparent; cursor: pointer; }
.study-lens-toggle:hover { color: var(--accent-bright); border-color: var(--accent); }
.study-lens-toggle:focus-visible { outline: none; box-shadow: var(--focus); }
.study-lens-toggle[aria-pressed="true"] { color: var(--accent-bright); background: color-mix(in srgb, var(--accent) 8%, transparent); border-color: var(--accent); }
.study-progress-track { height: 4px; margin-top: 20px; overflow: hidden; background: var(--border); border-radius: 99px; }
.study-progress-track span { display: block; height: 100%; background: var(--accent); border-radius: inherit; transition: width .18s ease; }
.study-objective { margin: 0; padding: 20px 22px; color: var(--text-dim); background: var(--panel); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: var(--r-control); font-size: 18px; }
.study-objective strong { color: var(--accent-bright); }
.study-map { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin: 18px 0 0; }
.study-map span { display: inline-flex; align-items: center; gap: 7px; color: var(--text-dim); font-size: 13px; }
.study-map span:not(:last-child)::after { content: "→"; color: var(--accent); font-family: monospace; }
.study-topic-list { display: grid; gap: 8px; margin: 20px 0 0; padding: 0; list-style: none; }
.study-topic-list li { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 10px; padding: 10px 12px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--r-control); color: var(--text-dim); font-size: 13.5px; }
.study-topic-list b { color: var(--accent); font-family: "SFMono-Regular", Consolas, monospace; }

.study-digest { margin: 58px 0; padding: 22px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-panel); }
.study-digest h2 { margin-bottom: 10px; }
.study-digest-one { margin: 16px 0 20px; padding: 14px 16px; background: color-mix(in srgb, var(--accent) 9%, var(--bg-alt)); border-left: 3px solid var(--accent); border-radius: var(--r-control); }
.study-digest-one span { display: block; margin-bottom: 5px; color: var(--accent); font: 700 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .12em; text-transform: uppercase; }
.study-digest-one strong { color: var(--text); }
.study-digest-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.study-digest-panel { padding: 15px 16px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--r-control); }
.study-digest-panel h3 { color: var(--accent-bright); font-size: 15px; }
.study-digest-panel ol, .study-digest-panel ul { margin: 8px 0 0; padding-left: 20px; color: var(--text-dim); font-size: 13.5px; }
.study-digest-check { margin: 16px 0 0; padding-top: 14px; border-top: 1px solid var(--border); color: var(--text-dim); }
.study-digest-check span { display: block; color: var(--text-muted); font: 700 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .12em; text-transform: uppercase; }

.study-full-node { min-width: 0; margin: 72px 0; scroll-margin-top: 84px; }
.study-node-head { margin-bottom: 18px; }
.study-node-head .section-label { margin-bottom: 7px; }
.study-node-head h2 { margin-bottom: 0; }
.study-node-core { margin: 18px 0 22px; padding: 16px 18px; background: color-mix(in srgb, var(--accent) 9%, var(--panel)); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: var(--r-control); }
.study-node-core span, .study-cue span { display: block; margin-bottom: 5px; color: var(--accent); font: 700 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .12em; text-transform: uppercase; }
.study-node-core p { margin: 0; color: var(--text); font-size: 18px; font-weight: 650; }
.study-node-body { min-width: 0; color: var(--text-dim); overflow-wrap: anywhere; }
.study-node-body > p:first-child:not(.teach-lead) { font-size: 17.5px; color: var(--text); }
.study-node-body p, .study-node-body li { line-height: 1.82; }
.study-node-body .teach-lead { margin-top: 22px; color: var(--text); font-weight: 650; }
.study-node-body .concept-list { display: grid; gap: 7px; padding-left: 22px; }
.study-node-body .flow { max-width: 100%; background: var(--image-stage); border: 1px solid var(--image-border); border-left: 3px solid var(--accent); white-space: pre-wrap; overflow-wrap: anywhere; word-break: break-word; }
.study-cue { margin: 24px 0 0; padding: 14px 16px; color: var(--text-dim); background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--r-control); }
.study-cue p { margin: 0; }

.andrew-lens {
  margin: 24px 0 0;
  padding: 21px;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--border));
  border-left: 4px solid var(--accent);
  border-radius: var(--r-panel);
}
.andrew-lens header { margin-bottom: 10px; }
.andrew-lens header .section-label { margin-bottom: 6px; }
.andrew-lens h3 { margin: 0; color: var(--text); font-size: 21px; }
.andrew-lens-hook { margin: 0 0 12px; color: var(--text-dim); font-size: 15px; line-height: 1.78; }
.andrew-lens-walkthrough,
.andrew-lens-check { margin: 10px 0 0; overflow: clip; background: var(--panel-2); border: 1px solid var(--border-strong); border-radius: var(--r-control); }
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > summary {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 9px;
  padding: 13px 15px;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > summary::-webkit-details-marker { display: none; }
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > summary::before {
  content: "▸";
  grid-row: 1 / span 2;
  align-self: center;
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  transition: transform .16s ease;
}
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check)[open] > summary::before { transform: rotate(90deg); }
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > summary:hover { background: color-mix(in srgb, var(--accent) 6%, var(--panel-2)); }
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > summary:focus-visible { outline: none; box-shadow: inset var(--focus); }
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check)[open] > summary { border-bottom: 1px solid var(--border); }
.andrew-lens-walkthrough summary > span,
.andrew-lens-check summary > span,
.andrew-lens-mapping > span,
.andrew-lens-steps > span,
.andrew-lens-formal > span,
.andrew-lens-check summary > span { display: block; margin-bottom: 4px; color: var(--accent); font: 750 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .11em; text-transform: uppercase; }
.andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > summary > strong { grid-column: 2; font-size: 14px; line-height: 1.45; }
.andrew-lens-body { display: grid; grid-template-columns: .82fr 1.18fr; gap: 10px; padding: 10px; }
.andrew-lens-body > div,
.andrew-lens-formal { padding: 14px 15px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--r-control); }
.andrew-lens-body :is(ul, ol) { display: grid; gap: 7px; margin: 7px 0 0; padding-left: 20px; color: var(--text-dim); font-size: 14px; line-height: 1.7; }
.andrew-lens-steps ol { counter-reset: lens-step; padding: 0; list-style: none; }
.andrew-lens-steps li { position: relative; padding-left: 29px; counter-increment: lens-step; }
.andrew-lens-steps li::before { content: counter(lens-step, decimal-leading-zero); position: absolute; left: 0; top: 1px; color: var(--accent); font: 700 10px/1.7 "SFMono-Regular", Consolas, monospace; }
.andrew-lens-formal { margin-top: 10px; border-color: color-mix(in srgb, var(--accent) 32%, var(--border)); }
.andrew-lens-formal p { margin: 0; color: var(--text); font-size: 14px; line-height: 1.75; }
.andrew-lens-boundary { margin: 10px 0 0; padding: 10px 12px; color: var(--text-muted); border-left: 2px solid var(--border-strong); font-size: 12.5px; line-height: 1.65; }
.andrew-lens-boundary strong { color: var(--text-dim); }
.andrew-lens-check > p { margin: 0; padding: 13px 15px 15px; color: var(--text-dim); line-height: 1.7; }
.andrew-lens-check > p strong { color: var(--accent-bright); }
.study-table-wrap {
  width: min(980px, calc(100vw - 32px));
  position: relative;
  left: 50%;
  margin: 26px 0 30px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  transform: translateX(-50%);
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-panel);
  scrollbar-color: var(--border-strong) var(--bg-alt);
}
.study-table-wrap:focus-visible { outline: none; box-shadow: var(--focus); }
.study-table-wrap table {
  width: 100%;
  min-width: 680px;
  margin: 0;
  border: 0;
  border-collapse: separate;
  border-spacing: 0;
  table-layout: auto;
  font-size: 14px;
  line-height: 1.55;
}
.study-table-wrap th,
.study-table-wrap td {
  padding: 12px 14px;
  overflow-wrap: anywhere;
  text-align: left;
  vertical-align: top;
}
.study-table-wrap thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  color: var(--accent-bright);
  background: color-mix(in srgb, var(--accent) 10%, var(--panel-2));
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 38%, var(--border));
  font: 750 10px/1.35 "SFMono-Regular", Consolas, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.study-table-wrap :is(th, td):not(:last-child) { border-right: 1px solid var(--border); }
.study-table-wrap tbody tr:not(:last-child) td { border-bottom: 1px solid var(--border); }
.study-table-wrap tbody td { color: var(--text-dim); background: var(--panel); }
.study-table-wrap tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--panel-2) 46%, var(--panel)); }
.study-table-wrap tbody tr:hover td { background: color-mix(in srgb, var(--accent) 8%, var(--panel)); }
.study-table-wrap tbody td:first-child {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  box-shadow: inset 3px 0 0 color-mix(in srgb, var(--accent) 58%, transparent);
  font-weight: 720;
}
.study-table-wrap tbody tr:nth-child(even) td:first-child { background: color-mix(in srgb, var(--accent) 10%, var(--panel)); }
.study-table-wrap tbody tr:hover td:first-child { background: color-mix(in srgb, var(--accent) 14%, var(--panel)); }
.study-table-wrap td strong { color: var(--text); }
.study-table-wrap thead th.is-empty::after { content: "比較面向"; color: var(--text-muted); }
.study-table-wrap tbody td.is-empty::after { content: "—"; color: var(--text-muted); }
.study-table-wrap table[data-study-columns="2"] :is(th, td):first-child { width: 34%; }
.study-table-wrap table[data-study-columns="3"] :is(th, td):first-child { width: 24%; }
.study-table-wrap table[data-study-columns="4"] :is(th, td):first-child { width: 22%; }
.study-table-wrap table[data-study-columns="5"] :is(th, td):first-child,
.study-table-wrap table[data-study-columns="6"] :is(th, td):first-child { width: 20%; }
.study-table-hint { display: none; color: var(--text-muted); font: 650 9.5px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .08em; }
.study-node-body .lesson-figure { width: min(980px, calc(100vw - 32px)); position: relative; left: 50%; margin: 24px 0; transform: translateX(-50%); overflow: hidden; background: var(--image-stage); border: 1px solid var(--image-border); border-radius: var(--r-panel); }
.study-node-body .lesson-figure img { display: block; width: 100%; max-height: 720px; object-fit: contain; background: var(--image-stage); border: 0; border-radius: 0; }
.study-node-body .lesson-figure figcaption { margin: 0; padding: 12px 15px; color: var(--text-dim); background: var(--image-stage); border-left: 0; border-top: 1px solid var(--image-border); }

.study-real-card { width: min(980px, calc(100vw - 32px)); position: relative; left: 50%; margin: 28px 0; transform: translateX(-50%); overflow: hidden; background: var(--image-stage); border: 1px solid var(--image-border); border-radius: var(--r-panel); }
.study-real-open { width: 100%; display: grid; padding: 0; color: inherit; background: var(--image-stage); border: 0; cursor: zoom-in; }
.study-real-open:focus-visible { outline: none; box-shadow: inset var(--focus); }
.study-real-media { min-height: 260px; display: grid; place-items: center; position: relative; background: var(--image-stage); }
.study-real-media img { display: block; width: 100%; max-height: 660px; object-fit: contain; background: var(--image-stage); }
.study-real-media.is-sensitive img { filter: blur(28px) brightness(.45); }
.study-sensitive-reveal { position: absolute; inset: 0; z-index: 2; display: grid; place-content: center; justify-items: center; gap: 8px; padding: 20px; color: var(--text); background: color-mix(in srgb, var(--image-stage) 36%, transparent); border: 0; cursor: pointer; }
.study-sensitive-reveal span { color: var(--text-dim); font-size: 13px; }
.study-real-zoom { position: absolute; right: 12px; bottom: 12px; padding: 6px 10px; color: var(--text); background: color-mix(in srgb, var(--image-stage) 84%, transparent); border: 1px solid var(--image-border); border-radius: var(--r-control); font-size: 12px; }
.study-real-caption { padding: 15px 17px 17px; border-top: 1px solid var(--image-border); }
.study-real-caption h3 { color: var(--text); }
.study-real-caption p { margin: 8px 0; color: var(--text-dim); font-size: 13.5px; }
.study-real-caption .boundary { color: var(--warn); }
.study-real-error { padding: 34px 20px; color: var(--bad); text-align: center; }
.study-optional-images { margin: 64px 0; border: 1px solid var(--border); border-radius: var(--r-panel); background: var(--panel); }
.study-optional-images summary { padding: 16px 18px; color: var(--text); cursor: pointer; }
.study-optional-images summary::before { color: var(--accent); }
.study-optional-images .optional-body { padding: 0 18px 18px; }
.study-optional-images .study-real-card { width: 100%; left: auto; transform: none; }

.study-worked-list { display: grid; gap: 18px; }
.study-worked { padding: 20px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-panel); }
.study-worked h3 { font-size: 20px; }
.study-worked-stem { padding: 13px 15px; color: var(--text); background: var(--bg-alt); border-left: 3px solid var(--warn); border-radius: var(--r-control); }
.study-worked .takeaway { margin-top: 16px; }
.study-action-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 18px; }
.study-action-state { color: var(--text-muted); font-size: 12.5px; }
.study-action-state.good { color: var(--good); }

.study-lab-breakout, .study-quiz-breakout { width: min(1040px, calc(100vw - 32px)); position: relative; left: 50%; margin: 24px 0; transform: translateX(-50%); }
.study-lab-breakout .lab-card, .study-quiz-breakout .quiz-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-panel); padding: 20px; }
.study-lab-breakout canvas { max-width: 100%; }
.study-full-page .question-option { min-width: 0; grid-template-columns: auto minmax(0, 1fr); }
.study-full-page .question-option > span:last-child, .study-full-page .calc-field { min-width: 0; }
.study-full-page .calc-field .input { width: 100%; min-width: 0; }
.study-recall-list { display: grid; gap: 10px; margin: 18px 0; padding: 0; list-style: none; counter-reset: recall; }
.study-recall-list li { position: relative; padding: 14px 16px 14px 54px; color: var(--text-dim); background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-control); counter-increment: recall; }
.study-recall-list li::before { content: counter(recall, decimal-leading-zero); position: absolute; left: 17px; top: 14px; color: var(--accent); font: 700 11px/1.6 "SFMono-Regular", Consolas, monospace; }
.study-recall-check { display: flex; align-items: flex-start; gap: 10px; padding: 14px 16px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--r-control); cursor: pointer; }
.study-recall-check input { width: 18px; height: 18px; margin-top: 5px; accent-color: var(--accent); }
.study-recall-check span { color: var(--text-dim); }

.study-boundary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.study-boundary-card { padding: 16px 18px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-control); }
.study-boundary-card h3 { color: var(--accent-bright); font-size: 16px; }
.study-boundary-card ul { margin: 8px 0 0; padding-left: 20px; color: var(--text-dim); font-size: 13.5px; }
.study-boundary-card.sources { grid-column: 1 / -1; }
.study-boundary-card.sources li { overflow-wrap: anywhere; }
.study-netter { margin: 62px 0; padding: 20px; background: var(--panel); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: var(--r-panel); }
.study-netter-grid { display: grid; gap: 10px; margin-top: 16px; }
.study-netter-card { display: block; padding: 14px 15px; color: inherit; text-decoration: none; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--r-control); }
a.study-netter-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.study-netter-card span { display: block; color: var(--accent); font: 700 10px/1.4 "SFMono-Regular", Consolas, monospace; letter-spacing: .1em; }
.study-netter-card strong { display: block; margin: 5px 0; }
.study-netter-card p { margin: 0; color: var(--text-dim); font-size: 13px; }
.study-netter-note { color: var(--text-muted); font-size: 12.5px; }

.study-chapter-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 72px; padding-top: 24px; border-top: 1px solid var(--border); }
.study-chapter-nav a { padding: 14px 16px; color: var(--text-dim); text-decoration: none; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-control); }
.study-chapter-nav a:hover { color: var(--text); border-color: var(--accent); }
.study-chapter-nav a:last-child { text-align: right; }
.study-chapter-nav .hub { grid-column: 1 / -1; text-align: center; }

.study-full-image-dialog { width: min(1180px, calc(100vw - 32px)); max-width: none; max-height: calc(100vh - 32px); padding: 0; overflow: auto; color: var(--text); background: var(--image-stage); border: 1px solid var(--image-border); border-radius: var(--r-panel); }
.study-full-image-dialog::backdrop { background: color-mix(in srgb, var(--image-stage) 86%, transparent); }
.study-full-image-dialog > header { position: sticky; top: 0; z-index: 3; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; background: var(--image-stage); border-bottom: 1px solid var(--image-border); }
.study-full-image-dialog h2 { margin: 0; font-size: 25px; }
.study-full-dialog-stage { min-height: 55vh; display: grid; place-items: center; background: var(--image-stage); }
.study-full-dialog-stage img { display: block; max-width: 100%; max-height: 78vh; object-fit: contain; background: var(--image-stage); }
.study-full-image-dialog > p { padding: 0 18px; color: var(--text-dim); }
.study-full-image-dialog .source-line { padding-bottom: 16px; }
.study-full-page .toast { z-index: 100; background: var(--panel-2); color: var(--text); }

@media (max-width: 900px) {
  .study-head-actions .head-link { display: none; }
  .study-hub-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .study-module-grid { grid-template-columns: 1fr; }
  .study-digest-grid, .study-boundary-grid { grid-template-columns: 1fr; }
  .andrew-lens-body { grid-template-columns: 1fr; }
  .study-boundary-card.sources { grid-column: auto; }
}

@media (max-width: 680px) {
  .study-full-page .site-head-in { width: min(100% - 28px, 1180px); }
  .study-head-actions { gap: 8px; }
  .study-head-actions .head-meta { font-size: 9px; }
  .study-full-hub, .study-full-chapter { width: min(100% - 32px, 760px); padding-top: 38px; }
  .study-hub-tools { display: grid; }
  .study-search { width: 100%; }
  .study-hub-stats { gap: 8px; }
  .study-hub-stat { padding: 13px 14px; }
  .study-module-card { grid-template-columns: 44px minmax(0, 1fr); padding: 15px; }
  .study-digest { padding: 17px; }
  .study-full-node { margin: 60px 0; }
  .study-course-actions { display: grid; }
  .study-course-actions .btn { width: 100%; justify-content: center; }
  .andrew-lens { margin-top: 20px; padding: 16px; }
  .andrew-lens h3 { font-size: 19px; }
  .study-table-hint { display: block; margin: 0 0 7px; }
  .study-table-wrap table { min-width: 620px; }
  .study-real-media { min-height: 180px; }
  .study-lab-breakout, .study-quiz-breakout { width: calc(100vw - 20px); }
  .study-lab-breakout .lab-card, .study-quiz-breakout .quiz-card { padding: 14px; }
  .study-chapter-nav { grid-template-columns: 1fr; }
  .study-chapter-nav a:last-child { text-align: left; }
  .study-chapter-nav .hub { grid-column: auto; text-align: left; }
  .model3d-layout { grid-template-columns: 1fr; }
  .model3d-stage { height: 390px; }
  .image-lab-grid { grid-template-columns: 1fr; }
  .histo-frame img { height: min(72vw, 360px); }
  .study-full-page .calc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media screen and (max-width: 680px) {
  .study-table-wrap:has(table.study-table-simple) {
    overflow: visible;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
  .study-table-wrap:has(table.study-table-simple):focus-visible { box-shadow: var(--focus); }
  .study-table-wrap:has(table.study-table-simple) + .study-table-hint,
  .study-table-hint:has(+ .study-table-wrap table.study-table-simple) { display: none; }
  .study-table-wrap table.study-table-simple { min-width: 0; display: block; font-size: 13.5px; }
  .study-table-simple thead { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
  .study-table-simple tbody { display: grid; gap: 10px; }
  .study-table-simple tbody tr { display: block; overflow: hidden; background: var(--panel); border: 1px solid var(--border-strong); border-radius: var(--r-control); }
  .study-table-simple tbody td {
    width: 100% !important;
    display: grid;
    grid-template-columns: minmax(86px, 30%) minmax(0, 1fr);
    gap: 12px;
    padding: 10px 12px;
    border-right: 0 !important;
    border-bottom: 1px solid var(--border) !important;
    box-shadow: none;
  }
  .study-table-simple tbody td:last-child { border-bottom: 0 !important; }
  .study-table-simple tbody td::before {
    content: attr(data-label);
    align-self: start;
    color: var(--accent-bright);
    font: 700 9px/1.45 "SFMono-Regular", Consolas, monospace;
    letter-spacing: .06em;
    text-transform: uppercase;
  }
  .study-table-simple tbody td.is-empty::after { grid-column: 2; grid-row: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .study-full-page *, .study-full-page *::before, .study-full-page *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

@media print {
  .study-full-page { --bg: #faf7f0; --bg-alt: #f3eee3; --panel: #fffdf8; --panel-2: #f7f1e7; --border: #ddd3c2; --border-strong: #c7baa5; --text: #2a261c; --text-dim: #5f594e; --text-muted: #766f62; --accent: #8e6034; --accent-bright: #71471f; --image-stage: #111; }
  .site-head, .study-action-row, .study-lab-breakout, .study-quiz-breakout, .study-chapter-nav { display: none !important; }
  .study-full-chapter { width: 100%; padding: 0; }
  .study-full-node { break-inside: avoid; }
  .andrew-lens { break-inside: avoid; background: transparent; }
  .andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check) > * { display: block !important; }
  .andrew-lens :is(.andrew-lens-walkthrough, .andrew-lens-check):not([open]) > *:not(summary) { display: block !important; }
}

html[data-reading-scale="1.5"] .andrew-lens-body,
html[data-reading-scale="1.75"] .andrew-lens-body,
html[data-reading-scale="2"] .andrew-lens-body { grid-template-columns: 1fr; }