/* ============================================================
   CONTENT PAGES — shared chrome for project / tutorial / course / book
   Relies on the MD3 tokens defined in main.css.
   ============================================================ */

/* ---- Reading progress bar (md-linear-progress) ---- */
.progress-bar{position:fixed;top:0;left:0;width:100%;z-index:120;
  --md-linear-progress-track-color:transparent;
  --md-linear-progress-track-height:3px;
  --md-linear-progress-active-indicator-height:3px;
  --md-linear-progress-active-indicator-color:var(--primary)}

/* ---- Breadcrumb ---- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:5px;
  font-family:"Roboto Mono",monospace;font-size:.72rem;letter-spacing:.3px;
  color:var(--on-surface-variant);margin-bottom:18px}
.breadcrumb a{color:var(--primary);font-weight:500}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb > *:not(:first-child)::before{content:"/";margin-inline-end:5px;
  color:var(--on-surface-variant);opacity:.5}

/* ---- Generic content section spacing ---- */
.content-wrap{padding-block:40px 56px}
.article-shell{padding-block:48px 72px}
.prerequisite-callout{margin-top:22px}

/* ============================================================
   PROSE — long-form typography
   ============================================================ */
.prose{max-width:72ch;color:var(--on-surface);font-size:1.05rem;line-height:1.7}
.prose > * + *{margin-top:.85em}
.prose h2{font-family:"Roboto Flex";font-weight:500;font-size:1.6rem;line-height:1.3;
  letter-spacing:0;margin-top:1.7em;padding-top:.1em;scroll-margin-top:88px}
.prose h3{font-family:"Roboto Flex";font-weight:500;font-size:1.25rem;line-height:1.35;
  margin-top:1.35em;scroll-margin-top:88px}
.prose h4{font-weight:600;font-size:1.02rem;margin-top:1.1em}
.prose p{color:var(--on-surface-variant)}
.prose strong{color:var(--on-surface);font-weight:600}
.prose a{color:var(--primary);font-weight:500;text-decoration:underline;
  text-underline-offset:2px;text-decoration-color:var(--outline-variant)}
.prose a:hover{text-decoration-color:var(--primary)}
.prose .cref{font-weight:600;text-decoration:none;border-bottom:1px solid var(--outline-variant)}
.prose .cref:hover{border-bottom-color:var(--primary)}
.prose .cref--missing{color:var(--error);border-bottom-color:var(--error);cursor:help}
.prose .citation{font-weight:500;text-decoration:none;border-bottom:1px solid var(--outline-variant)}
.prose .citation:hover{border-bottom-color:var(--primary)}
.prose .citation--missing{color:var(--error);border-bottom-color:var(--error);cursor:help}
.prose ul,.prose ol{padding-left:1.4em;color:var(--on-surface-variant)}
.prose li{margin-top:.4em}
.prose li::marker{color:var(--primary)}
.prose blockquote{border-left:3px solid var(--primary);padding:.4em 0 .4em 1.2em;
  margin-left:0;color:var(--on-surface-variant);font-style:italic}
.prose hr{border:none;border-top:1px solid var(--outline-variant);margin:2.5em 0}
.prose img{border-radius:var(--shape-md);border:1px solid var(--outline-variant)}
.prose code{font-family:"Roboto Mono",monospace;font-size:.86em;
  background:var(--surface-container-high);color:var(--on-surface);
  padding:.12em .4em;border-radius:var(--shape-xs)}

/* Code blocks (works with or without Rouge highlighting) */
.prose pre,.code-block,.highlight{position:relative;background:var(--surface-container-high);
  border:1px solid var(--outline-variant);border-radius:var(--shape-md);
  padding:12px 14px;overflow-x:auto;font-size:.84rem;line-height:1.55;margin-top:.85em}
.prose pre code,.code-block code,.highlight code{background:none;padding:0;font-size:inherit;
  color:var(--on-surface);font-family:"Roboto Mono",monospace}
.highlight pre{margin:0;padding:0;border:0;background:transparent;overflow:visible}
.highlight .hll{background:var(--surface-container-highest)}
.highlight .c,.highlight .cm,.highlight .c1,.highlight .cs{color:#6f7f8f;font-style:italic}
.highlight .k,.highlight .kc,.highlight .kd,.highlight .kn,.highlight .kp,.highlight .kr,.highlight .kt{color:#7c4dff;font-weight:500}
.highlight .o,.highlight .ow{color:#006d77}
.highlight .p{color:var(--on-surface-variant)}
.highlight .n{color:var(--on-surface)}
.highlight .na,.highlight .nc,.highlight .nd,.highlight .ne,.highlight .nf,.highlight .nx{color:#006d9c}
.highlight .nb,.highlight .bp{color:#8a5100}
.highlight .s,.highlight .sb,.highlight .sc,.highlight .sd,.highlight .s1,.highlight .s2,.highlight .se,.highlight .sh,.highlight .si,.highlight .sx{color:#0b7a38}
.highlight .m,.highlight .mb,.highlight .mf,.highlight .mh,.highlight .mi,.highlight .mo,.highlight .il{color:#b3261e}
.highlight .nt{color:#8a5100}
.highlight .nv,.highlight .vc,.highlight .vg,.highlight .vi{color:#9c27b0}
.highlight .err{color:var(--error);background:var(--error-container)}
[data-theme="dark"] .highlight .c,[data-theme="dark"] .highlight .cm,[data-theme="dark"] .highlight .c1,[data-theme="dark"] .highlight .cs{color:#9aa6b2}
[data-theme="dark"] .highlight .k,[data-theme="dark"] .highlight .kc,[data-theme="dark"] .highlight .kd,[data-theme="dark"] .highlight .kn,[data-theme="dark"] .highlight .kp,[data-theme="dark"] .highlight .kr,[data-theme="dark"] .highlight .kt{color:#c7b8ff}
[data-theme="dark"] .highlight .o,[data-theme="dark"] .highlight .ow{color:#78d8df}
[data-theme="dark"] .highlight .na,[data-theme="dark"] .highlight .nc,[data-theme="dark"] .highlight .nd,[data-theme="dark"] .highlight .ne,[data-theme="dark"] .highlight .nf,[data-theme="dark"] .highlight .nx{color:#8ed8ff}
[data-theme="dark"] .highlight .nb,[data-theme="dark"] .highlight .bp,[data-theme="dark"] .highlight .nt{color:#ffca8a}
[data-theme="dark"] .highlight .s,[data-theme="dark"] .highlight .sb,[data-theme="dark"] .highlight .sc,[data-theme="dark"] .highlight .sd,[data-theme="dark"] .highlight .s1,[data-theme="dark"] .highlight .s2,[data-theme="dark"] .highlight .se,[data-theme="dark"] .highlight .sh,[data-theme="dark"] .highlight .si,[data-theme="dark"] .highlight .sx{color:#8ee6a4}
[data-theme="dark"] .highlight .m,[data-theme="dark"] .highlight .mb,[data-theme="dark"] .highlight .mf,[data-theme="dark"] .highlight .mh,[data-theme="dark"] .highlight .mi,[data-theme="dark"] .highlight .mo,[data-theme="dark"] .highlight .il{color:#ffb4ab}
[data-theme="dark"] .highlight .nv,[data-theme="dark"] .highlight .vc,[data-theme="dark"] .highlight .vg,[data-theme="dark"] .highlight .vi{color:#f0b6ff}
.copy-btn{position:absolute;top:10px;right:10px;opacity:0;transition:opacity var(--dur-short);
}
.prose pre:hover .copy-btn,.code-block:hover .copy-btn{opacity:1}
.copy-btn .m3-icon{font-size:14px}

/* Prose tables */
.prose table{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:1.2em}
.prose th,.prose td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--outline-variant)}
.prose th{font-weight:600;color:var(--on-surface);background:var(--surface-container-low)}
.prose td{color:var(--on-surface-variant)}

/* ---- Callouts ---- */
.callout{display:flex;gap:10px;padding:10px 12px;border-radius:var(--shape-md);
  background:var(--secondary-container);color:var(--on-secondary-container);margin-top:.9em}
.callout .m3-icon{font-size:20px;align-self:center;flex-shrink:0}
.callout p{margin:0;color:inherit;font-size:.95rem}
.callout strong{color:inherit}
.callout.tip{background:var(--primary-container);color:var(--on-primary-container)}
.callout.warning{background:#fff8eb;color:#8a5a00;border:1px solid #ffe2a8}
[data-theme="dark"] .callout.warning{background:#2b1700;color:#ffe2a8;border:1px solid #4d3300}
.callout.note{background:var(--secondary-container);color:var(--on-secondary-container)}

/* ---- Mathematical writing primitives ---- */
.statement-block,.algorithm-block{
  --primitive-accent:var(--primary);
  --primitive-tint:var(--primary-container);
  --primitive-on-tint:var(--on-primary-container);
  position:relative;
  overflow:hidden;
  border:1px solid color-mix(in srgb,var(--primitive-accent) 34%,var(--outline-variant));
  border-left:5px solid var(--primitive-accent);
  border-radius:var(--shape-md);
  background:linear-gradient(135deg,
    color-mix(in srgb,var(--primitive-tint) 38%,var(--surface-container-lowest)) 0%,
    var(--surface-container-lowest) 58%);
  box-shadow:0 1px 2px rgba(var(--shadow),.08);
  margin-block:1.15em;
}
.statement-block::before,.algorithm-block::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:linear-gradient(90deg,var(--primitive-accent),transparent);
  opacity:.78;
}
.statement-block__head,.algorithm-block__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px;
  padding:13px 16px 8px;
}
.statement-block__kind,.algorithm-block__kind{
  display:inline-flex;
  align-items:center;
  min-height:24px;
  padding:2px 9px;
  border-radius:var(--shape-full);
  background:var(--primitive-tint);
  color:var(--primitive-on-tint);
  font-family:"Roboto Mono",monospace;
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.7px;
  text-transform:uppercase;
}
.statement-block__title,.algorithm-block__title{
  color:var(--on-surface);
  font-family:"Roboto Flex";
  font-size:1.02rem;
  font-weight:600;
  letter-spacing:0;
}
.statement-block__body,.algorithm-block__body{
  padding:0 16px 15px;
}
.statement-block__body > *,.algorithm-block__body > *{margin-top:.72em}
.statement-block__body > :first-child,.algorithm-block__body > :first-child{margin-top:0}
.statement-block p,.algorithm-block p,
.statement-block li,.algorithm-block li{color:var(--on-surface-variant)}
.statement-block strong,.algorithm-block strong{color:var(--on-surface)}
.statement-block em{color:var(--on-surface)}
.statement-block--theorem{
  --primitive-accent:var(--primary);
  --primitive-tint:var(--primary-container);
  --primitive-on-tint:var(--on-primary-container);
}
.statement-block--proposition{
  --primitive-accent:#2f6f62;
  --primitive-tint:#d4f3ea;
  --primitive-on-tint:#062018;
}
.statement-block--lemma{
  --primitive-accent:#8a5a00;
  --primitive-tint:#ffe2a8;
  --primitive-on-tint:#2b1700;
}
.statement-block--remark{
  --primitive-accent:var(--tertiary);
  --primitive-tint:var(--tertiary-container);
  --primitive-on-tint:var(--on-tertiary-container);
  background:var(--surface-container-low);
  border-left-style:double;
}
.algorithm-block{
  --primitive-accent:#6b5ca5;
  --primitive-tint:#e8ddff;
  --primitive-on-tint:#21143f;
}
.algorithm-steps{
  list-style:none;
  counter-reset:algorithm-step;
  display:grid;
  gap:8px;
  padding:0;
}
.algorithm-steps li{
  counter-increment:algorithm-step;
  display:grid;
  grid-template-columns:34px minmax(0,1fr);
  gap:10px;
  align-items:start;
  padding:9px 10px;
  border:1px solid var(--outline-variant);
  border-radius:var(--shape-sm);
  background:color-mix(in srgb,var(--surface-container-lowest) 82%,var(--primitive-tint));
}
.algorithm-steps li::before{
  content:counter(algorithm-step,decimal-leading-zero);
  display:inline-grid;
  place-items:center;
  justify-self:start;
  width:34px;
  min-width:34px;
  height:24px;
  border-radius:var(--shape-full);
  background:var(--primitive-tint);
  color:var(--primitive-on-tint);
  font-family:"Roboto Mono",monospace;
  font-size:.68rem;
  font-weight:600;
}
.algorithm-step-content{min-width:0}
.algorithm-step-content > * + *{margin-top:4px}
.algorithm-step-equation{
  display:block;
  text-align:center;
  color:var(--on-surface);
  line-height:1.55;
}
.algorithm-steps code{white-space:nowrap}
.algorithm-code{
  counter-reset:algorithm-line;
  display:grid;
  gap:2px;
  padding:8px;
  border:1px solid var(--outline-variant);
  border-radius:var(--shape-sm);
  background:color-mix(in srgb,var(--surface-container-lowest) 86%,var(--primitive-tint));
  overflow-x:auto;
}
.alg-line{
  counter-increment:algorithm-line;
  display:grid;
  grid-template-columns:34px minmax(0,1fr);
  align-items:baseline;
  gap:10px;
  min-height:28px;
  padding:4px 6px;
  border-radius:var(--shape-xs);
  color:var(--on-surface-variant);
}
.alg-line::before{
  content:counter(algorithm-line,decimal-leading-zero);
  display:inline-grid;
  place-items:center;
  width:28px;
  height:22px;
  border-radius:var(--shape-full);
  background:var(--primitive-tint);
  color:var(--primitive-on-tint);
  font-family:"Roboto Mono",monospace;
  font-size:.64rem;
  font-weight:600;
}
.alg-line:hover{background:color-mix(in srgb,var(--primitive-tint) 32%,transparent)}
.alg-line__body{min-width:0}
.alg-indent-1 .alg-line__body{padding-left:18px}
.alg-indent-2 .alg-line__body{padding-left:36px}
.alg-indent-3 .alg-line__body{padding-left:54px}
.alg-keyword{
  color:var(--on-surface);
  font-family:"Roboto Mono",monospace;
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.2px;
  text-transform:uppercase;
}
.alg-comment{
  color:var(--on-surface-variant);
  font-style:italic;
  opacity:.86;
}
.alg-display{
  grid-column:2;
  color:var(--on-surface);
  text-align:center;
  padding:3px 8px 7px;
  line-height:1.55;
}
.alg-line--display::before{visibility:hidden}
.alg-line--display:hover{background:transparent}
[data-theme="dark"] .statement-block--proposition{
  --primitive-accent:#8adccb;
  --primitive-tint:#173b34;
  --primitive-on-tint:#d4f3ea;
}
[data-theme="dark"] .statement-block--lemma{
  --primitive-accent:#ffca74;
  --primitive-tint:#4b3200;
  --primitive-on-tint:#ffe2a8;
}
[data-theme="dark"] .algorithm-block{
  --primitive-accent:#d0bcff;
  --primitive-tint:#352a5d;
  --primitive-on-tint:#efe6ff;
}

.citation-bibliography{
  margin-top:2.4em;
  padding-top:1.2em;
  border-top:1px solid var(--outline-variant);
}
.citation-bibliography h2{
  margin-top:0;
}
.citation-list{
  list-style:none;
  counter-reset:citation-ref;
  display:grid;
  gap:12px;
  padding-left:0!important;
}
.citation-list li{
  counter-increment:citation-ref;
  position:relative;
  display:block;
  margin-top:0;
}
.citation-list li::before{
  content:counter(citation-ref);
  position:absolute;
  top:14px;
  left:14px;
  z-index:1;
  display:grid;
  place-items:center;
  width:30px;
  height:30px;
  border-radius:var(--shape-full);
  background:var(--primary-container);
  color:var(--on-primary-container);
  font-family:"Roboto Mono",monospace;
  font-size:.72rem;
  font-weight:600;
}
.citation-card{
  min-width:0;
  display:grid;
  gap:5px;
  min-height:74px;
  padding:13px 16px 13px 58px;
  border:1px solid var(--outline-variant);
  border-radius:var(--shape-md);
  background:var(--surface-container-low);
  box-shadow:0 1px 2px rgba(var(--shadow),.06);
}
a.citation-card{
  text-decoration:none!important;
}
.citation-card--clickable{
  cursor:pointer;
  transition:background-color 0.2s, border-color 0.2s, transform 0.15s;
}
.citation-card--clickable:hover{
  background:var(--surface-container-high);
  border-color:color-mix(in srgb,var(--primary) 65%,transparent);
  transform:translateY(-1px);
}
.citation-card--clickable:active{
  transform:translateY(0);
}
.citation-card__title{
  color:var(--on-surface);
  font-family:"Roboto Flex";
  font-size:1rem;
  font-weight:600;
  line-height:1.35;
  letter-spacing:0;
}
.citation-card__authors{
  color:var(--on-surface-variant);
  font-size:.92rem;
  line-height:1.45;
}
.citation-card__meta{
  color:var(--on-surface-variant);
  font-family:"Roboto Mono",monospace;
  font-size:.74rem;
  line-height:1.45;
}
.citation-card__link{
  justify-self:start;
  display:inline-flex;
  align-items:center;
  min-height:26px;
  padding:2px 9px;
  border-radius:var(--shape-full);
  background:var(--secondary-container);
  color:var(--on-secondary-container)!important;
  font-family:"Roboto Mono",monospace;
  font-size:.68rem;
  font-weight:600!important;
  text-decoration:none!important;
  border-bottom:none!important;
}

/* ---- Figures ---- */
.media-ph{min-height:320px}
.project-teaser-img {
  width: 100%;
  height: auto;
  border-radius: var(--shape-md);
  border: 1px solid var(--outline-variant);
  object-fit: cover;
  display: block;
}
.project-figure-img {
  width: 100%;
  height: auto;
  border-radius: var(--shape-md);
  border: 1px solid var(--outline-variant);
  object-fit: cover;
  display: block;
}
.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  border-radius: var(--shape-md);
  border: 1px solid var(--outline-variant);
}
.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.system-media-img, .system-media-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}


/* ============================================================
   ARTICLE GRID (tutorial) — content + sticky TOC
   ============================================================ */
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:28px;align-items:start}
.article-main{min-width:0}
.article-side{position:sticky;top:88px}
.article-head{margin-bottom:18px}
.article-head h1{font-family:"Roboto Flex";font-weight:600;font-size:2.6rem;
  line-height:1.1;letter-spacing:0;margin:14px 0 12px}
.article-head .lede{font-size:1.15rem;color:var(--on-surface-variant);line-height:1.5;max-width:62ch}
.meta-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.pill{display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 12px;
  border-radius:var(--shape-full);font-family:"Roboto Mono",monospace;font-size:.72rem;
  font-weight:500;letter-spacing:.3px;background:var(--surface-container-high);
  color:var(--on-surface-variant)}
.pill.accent{background:var(--tertiary-container);color:var(--on-tertiary-container)}

.toc{border-left:2px solid var(--outline-variant);padding-left:18px}
.toc-title{font-family:"Roboto Mono",monospace;font-size:.68rem;letter-spacing:1.5px;
  text-transform:uppercase;color:var(--on-surface-variant);margin-bottom:12px}
.toc ul{list-style:none;display:flex;flex-direction:column;gap:2px}
.toc a{display:block;padding:5px 10px;border-radius:var(--shape-sm);font-size:.84rem;
  color:var(--on-surface-variant);line-height:1.4;transition:background var(--dur-short),color var(--dur-short)}
.toc a:hover{background:var(--surface-container)}
.toc a.sub{padding-left:22px;font-size:.8rem}
.toc a.active{color:var(--primary);background:var(--primary-container);font-weight:500}

/* ---- Prev/next pager ---- */
.page-nav{display:flex;justify-content:space-between;gap:10px;margin-top:34px;
  padding-top:18px;border-top:1px solid var(--outline-variant)}
.page-nav a{flex:1;max-width:48%;padding:10px 12px;border-radius:var(--shape-md);
  border:1px solid var(--outline-variant);transition:background var(--dur-short),border-color var(--dur-short)}
.page-nav a:hover{background:var(--surface-container);border-color:var(--outline)}
.page-nav a.next{text-align:right;margin-left:auto}
.page-nav small{font-family:"Roboto Mono",monospace;font-size:.68rem;letter-spacing:.5px;
  text-transform:uppercase;color:var(--on-surface-variant);display:flex;align-items:center;gap:4px}
.page-nav a.next small{justify-content:flex-end}
.page-nav b{display:block;font-family:"Roboto Flex";font-weight:500;color:var(--on-surface);margin-top:4px}

/* ============================================================
   PROJECT PAGE
   ============================================================ */
.project{max-width:1040px;margin-inline:auto;padding-block:32px 52px}
.project-sheet-head{text-align:center;margin-inline:auto;max-width:860px}
.proj-hero h1{font-family:"Roboto Flex";font-weight:600;font-size:3.4rem;
  line-height:1.05;letter-spacing:0;margin:10px 0 8px}
.project-venue{font-size:1rem;color:var(--on-surface-variant);margin:0 0 12px}
.project-award-pill{
  display:inline-flex;align-items:center;gap:6px;margin:0 0 12px;padding:4px 14px;
  border-radius:var(--shape-full);background:var(--error-container);color:var(--on-error-container);
  font-size:.85rem;font-weight:600;border:1px solid var(--error-container);
}
.project-award-pill .m3-icon{font-size:20px}
.proj-hero .subtitle{font-size:1.12rem;color:var(--on-surface-variant);max-width:68ch;margin-inline:auto}
.authors-row{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 14px;margin:14px 0 4px;font-size:1rem}
.authors-row a,.authors-row span.name{color:var(--on-surface-variant)}
.authors-row a{color:var(--primary);text-decoration:none}
.authors-row a:hover{text-decoration:underline}
.authors-row .me{color:var(--on-surface);font-weight:600;border-bottom:2px solid var(--tertiary)}
.affil{color:var(--on-surface-variant);font-size:.9rem;margin-top:2px;text-align:center}
.project-teaser{margin:22px 0 12px}
.project-teaser .media-ph{width:100%;border-radius:var(--shape-md);
  border:1px solid var(--outline-variant);overflow:hidden}
.artifact-row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:14px 0 22px}
.project-block{margin:22px 0}
.abstract{background:var(--surface-container-low);border:1px solid var(--outline-variant);
  border-radius:var(--shape-md);padding:16px 18px}
.abstract p{color:var(--on-surface-variant);line-height:1.65;margin:0;font-size:1rem}
.project-block h2{font-family:"Roboto Flex";font-weight:500;font-size:1.35rem;line-height:1.3;margin-bottom:10px}
.resource-list{display:grid;gap:8px}
.resource-item{display:grid;gap:10px;align-items:start;
  padding:10px;border-radius:var(--shape-md);border:1px solid var(--outline-variant);
  background:var(--surface-container-low);transition:background var(--dur-short),border-color var(--dur-short)}
.resource-item:hover{background:var(--surface-container);border-color:var(--outline)}
.resource-item b{display:block;color:var(--on-surface);font-weight:500}
.resource-item small{display:block;color:var(--on-surface-variant);line-height:1.45;margin-top:2px}
.project-figures{display:flex;flex-direction:column;gap:10px}
.project-figures h2{margin-bottom:0}
.figure-card{display:flex;flex-direction:column;gap:8px;
  padding:10px;border-radius:var(--shape-md);border:1px solid var(--outline-variant);
  background:var(--surface-container-low)}
.figure-placeholder{width:100%;border-radius:var(--shape-md);border:1px solid var(--outline-variant)}
.figure-placeholder{min-height:220px}
.figure-card figcaption{color:var(--on-surface-variant);font-size:.92rem;line-height:1.55}
.figure-card figcaption b{display:block;color:var(--on-surface);font-weight:500;margin-bottom:4px}
.project-note{padding:12px 14px;border-radius:var(--shape-md);background:var(--surface-container-low);
  color:var(--on-surface-variant);font-size:.92rem;line-height:1.55}
.cite{margin-top:30px}
.cite h2{font-family:"Roboto Flex";font-weight:500;font-size:1.3rem;margin-bottom:14px}

/* ---- Developed system pages ---- */
.system-kind-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin:0 0 12px;
  padding:4px 14px;
  border-radius:var(--shape-full);
  background:var(--secondary-container);
  color:var(--on-secondary-container);
  font-family:"Roboto Mono",monospace;
  font-size:.74rem;
  font-weight:600;
  letter-spacing:.3px;
  text-transform:uppercase;
}
.system-kind-pill .m3-icon{font-size:19px}
.system-detail-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;
  overflow:hidden;
  border:1px solid var(--outline-variant);
  border-radius:var(--shape-md);
  background:var(--outline-variant);
}
.system-detail-item{
  background:var(--surface-container-low);
  padding:14px;
}
.system-detail-item p{
  color:var(--on-surface-variant);
  margin-top:6px;
  line-height:1.55;
}
.system-feature-section h2{font-family:"Roboto Flex";font-weight:500;font-size:1.35rem;line-height:1.3;margin-bottom:10px}
.system-stats{
  justify-content:center;
  padding:14px;
  border:1px solid var(--outline-variant);
  border-radius:var(--shape-md);
  background:var(--surface-container-low);
}

/* ============================================================
   SUBJECT AREA PAGE
   ============================================================ */
.subject-area{max-width:1040px;margin-inline:auto;padding-block:32px 56px}
.subject-hero{text-align:center;margin-inline:auto;max-width:860px}
.subject-hero h1{font-family:"Roboto Flex";font-weight:600;font-size:3.2rem;
  line-height:1.06;letter-spacing:0;margin:10px 0 10px}
.subject-hero .subtitle{font-size:1.12rem;color:var(--on-surface-variant);max-width:68ch;margin-inline:auto}
.subject-teaser{margin:22px 0 14px}
.subject-teaser .media-ph{width:100%;border-radius:var(--shape-md);
  border:1px solid var(--outline-variant);overflow:hidden}
.subject-lede{max-width:860px;margin-inline:auto}
.subject-prose{margin-top:28px}
.subject-publications{margin-top:48px;padding-top:28px;border-top:1px solid var(--outline-variant)}
.subject-publications .section-head{margin-bottom:18px}
.subject-pub-list{max-width:900px}
.subject-empty,.publication-missing{color:var(--on-surface-variant)}
.publication-missing{
  padding:12px 14px;
  border:1px dashed var(--outline);
  border-radius:var(--shape-md);
  background:var(--surface-container-low);
}

/* ============================================================
   COURSE PAGE
   ============================================================ */
.course{max-width:1000px;margin-inline:auto;padding-block:32px 52px}
.course-head h1{font-family:"Roboto Flex";font-weight:600;font-size:2.8rem;
  line-height:1.1;letter-spacing:0;margin:12px 0 12px}
.course-head .lede{font-size:1.15rem;color:var(--on-surface-variant);max-width:70ch;line-height:1.55}
.meta-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1px;
  background:var(--outline-variant);border:1px solid var(--outline-variant);
  border-radius:var(--shape-md);overflow:hidden;margin:20px 0}
.meta-grid .cell{background:var(--surface-container-low);padding:12px 14px}
.meta-grid .k{font-family:"Roboto Mono",monospace;font-size:.66rem;letter-spacing:1px;
  text-transform:uppercase;color:var(--on-surface-variant);display:flex;align-items:center;gap:6px}
.meta-grid .v{font-size:1rem;color:var(--on-surface);font-weight:500;margin-top:6px}
.course h2{font-family:"Roboto Flex";font-weight:500;font-size:1.5rem;margin:48px 0 18px;letter-spacing:0}

.staff-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.staff{display:flex;gap:10px;align-items:center;background:var(--surface-container-low);
  border:1px solid var(--outline-variant);border-radius:var(--shape-md);padding:10px}
.staff.staff--link{cursor:pointer;transition:background .2s ease,border-color .2s ease}
.staff.staff--link:hover{background:var(--surface-container);border-color:var(--outline)}
.staff .avatar{width:56px;height:56px;border-radius:50%;flex-shrink:0}
.staff .avatar .placeholder-label{display:none}
.staff b{display:block;font-weight:500}
.staff small{color:var(--on-surface-variant);font-size:.8rem}
.staff a{color:var(--primary);font-size:.8rem;text-decoration:none}

.schedule{width:100%;border-collapse:collapse;font-size:.92rem;
  border:1px solid var(--outline-variant);border-radius:var(--shape-md);overflow:hidden}
.schedule thead th{background:var(--surface-container);color:var(--on-surface);
  font-weight:600;text-align:left;padding:9px 12px;font-size:.8rem}
.schedule td{padding:9px 12px;border-top:1px solid var(--outline-variant);
  color:var(--on-surface-variant);vertical-align:top}
.schedule tr:hover td{background:var(--surface-container-low)}
.schedule .wk{font-family:"Roboto Mono",monospace;color:var(--tertiary);font-weight:500;white-space:nowrap}
.schedule-date{color:var(--on-surface-variant);font-size:.78rem}
.schedule .topic{color:var(--on-surface);font-weight:500}
.schedule a{color:var(--primary);text-decoration:none;font-size:.82rem}
.schedule .tag-due{display:inline-block;font-family:"Roboto Mono",monospace;font-size:.66rem;
  padding:1px 7px;border-radius:var(--shape-full);background:var(--tertiary-container);
  color:var(--on-tertiary-container)}

.grade-list{display:flex;flex-direction:column;gap:8px;max-width:520px}
.grade-row{display:grid;grid-template-columns:160px 1fr 44px;gap:10px;align-items:center}
.grade-row .lab{color:var(--on-surface);font-size:.92rem}
.grade-bar{
  --md-linear-progress-track-height:10px;
  --md-linear-progress-active-indicator-height:10px;
  --md-linear-progress-track-color:var(--surface-container-high);
  --md-linear-progress-active-indicator-color:var(--primary);
  --md-linear-progress-track-shape:var(--shape-full);
}
.grade-row .pct{font-family:"Roboto Mono",monospace;font-size:.82rem;color:var(--on-surface-variant);text-align:right}
.course-prose{margin-top:48px;max-width:none}

/* ============================================================
   BOOK — landing
   ============================================================ */
.book{max-width:1000px;margin-inline:auto;padding-block:32px 52px}
.book-hero{display:grid;grid-template-columns:220px 1fr;gap:28px;align-items:center;margin-bottom:16px}
.book-cover{aspect-ratio:3/4;border-radius:var(--shape-md);overflow:hidden;position:relative;
  border:1px solid var(--outline-variant);background:var(--primary-container);
  color:var(--on-primary-container);padding:18px 16px;display:flex;flex-direction:column;justify-content:space-between}
.book-cover .bc-top{font-family:"Roboto Mono",monospace;font-size:.62rem;letter-spacing:2px;
  text-transform:uppercase;opacity:.8}
.book-cover .bc-title{font-family:"Roboto Flex";font-weight:600;font-size:1.5rem;line-height:1.15;letter-spacing:0}
.book-cover .bc-auth{font-size:.82rem;opacity:.9}
.book-cover svg{position:absolute;right:-30px;top:40%;width:140px;opacity:.22}
.book-intro h1{font-family:"Roboto Flex";font-weight:600;font-size:2.6rem;
  line-height:1.1;letter-spacing:0;margin:10px 0 10px}
.book-intro .subtitle{font-size:1.15rem;color:var(--on-surface-variant);max-width:54ch}
.book-stats{display:flex;gap:22px;margin:20px 0 22px;flex-wrap:wrap}
.book-stats .stat b{font-family:"Roboto Flex";font-weight:600;font-size:1.5rem;color:var(--primary)}
.book-stats .stat span{display:block;font-family:"Roboto Mono",monospace;font-size:.68rem;
  letter-spacing:.5px;color:var(--on-surface-variant);text-transform:uppercase}

.book-toc{margin-top:28px}
.book-toc h2{font-family:"Roboto Flex";font-weight:500;font-size:1.5rem;margin-bottom:8px}
.part-title{font-family:"Roboto Mono",monospace;font-size:.74rem;letter-spacing:1.5px;
  text-transform:uppercase;color:var(--tertiary);margin:28px 0 8px}
.toc-chapter{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--shape-md);
  border:1px solid var(--outline-variant);margin-top:6px;
  transition:background var(--dur-short),border-color var(--dur-short)}
.toc-chapter:hover{background:var(--surface-container-low);border-color:var(--outline)}
.toc-chapter .num{font-family:"Roboto Mono",monospace;font-weight:500;color:var(--primary);
  font-size:1rem;min-width:28px}
.toc-chapter b{font-family:"Roboto Flex";font-weight:500;color:var(--on-surface)}

/* ============================================================
   BOOK — chapter reader
   ============================================================ */
.chapter-grid{display:grid;grid-template-columns:240px minmax(0,1fr);gap:28px;align-items:start;
  max-width:1100px;margin-inline:auto}
.chapter-nav{position:sticky;top:88px;max-height:calc(100vh - 110px);overflow-y:auto;
  border-right:1px solid var(--outline-variant);padding-right:18px}
.chapter-nav .book-link{display:flex;align-items:center;gap:8px;font-family:"Roboto Flex";
  font-weight:600;color:var(--on-surface);margin-bottom:14px;font-size:.95rem}
.chapter-nav ol{list-style:none;counter-reset:ch}
.chapter-nav li{counter-increment:ch}
.chapter-nav .pt{font-family:"Roboto Mono",monospace;font-size:.64rem;letter-spacing:1px;
  text-transform:uppercase;color:var(--on-surface-variant);margin:16px 0 6px}
.chapter-nav a{display:flex;gap:10px;padding:8px 10px;border-radius:var(--shape-sm);
  font-size:.86rem;color:var(--on-surface-variant);line-height:1.35;
  transition:background var(--dur-short),color var(--dur-short)}
.chapter-nav a::before{content:counter(ch);font-family:"Roboto Mono",monospace;
  color:var(--outline);font-size:.78rem;min-width:16px}
.chapter-nav a:hover{background:var(--surface-container)}
.chapter-nav a.active{background:var(--primary-container);color:var(--on-primary-container);font-weight:500}
.chapter-nav a.active::before{color:var(--on-primary-container)}
.chapter-main{min-width:0;padding-bottom:40px}
.chapter-main .ch-eyebrow{font-family:"Roboto Mono",monospace;font-size:.74rem;letter-spacing:2px;
  text-transform:uppercase;color:var(--tertiary)}
.chapter-main h1{font-family:"Roboto Flex";font-weight:600;font-size:2.6rem;
  line-height:1.1;letter-spacing:0;margin:8px 0 28px}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:900px){
  .article-grid{grid-template-columns:1fr}
  .article-side{display:none}
  .chapter-grid{grid-template-columns:1fr}
  .chapter-nav{position:static;border-right:none;border-bottom:1px solid var(--outline-variant);
    padding-right:0;padding-bottom:18px;margin-bottom:8px;max-height:none}
  .book-hero{grid-template-columns:1fr;gap:28px}
  .book-cover{max-width:220px}
}
@media (max-width:680px){
  .meta-grid{grid-template-columns:1fr 1fr}
  .schedule{display:block;overflow-x:auto;white-space:nowrap}
  .grade-row{grid-template-columns:120px 1fr 40px}
  .page-nav{flex-direction:column}
  .page-nav a{max-width:100%}
  .project,.subject-area,.course,.book{padding-block:28px 44px}
  .article-head h1,.proj-hero h1,.subject-hero h1,.course-head h1,.book-intro h1,.chapter-main h1{font-size:2rem}
  .system-detail-grid{grid-template-columns:1fr}
  .abstract{padding:12px}
  .resource-item{padding:10px}
  .citation-list li::before{top:12px;left:12px;width:28px;height:28px}
  .citation-card{padding:11px 12px 11px 52px}
}

/* ---------- Figure lightbox ---------- */
.fig-zoom{display:block;cursor:zoom-in}
.fig-lightbox{
  position:fixed;inset:0;z-index:1000;
  display:flex;align-items:center;justify-content:center;
  background:rgba(0,0,0,.82);cursor:zoom-out;
  animation:fig-lightbox-in var(--dur-short,150ms) var(--ease-standard,ease) both;
}
.fig-lightbox img{
  max-width:95vw;max-height:95vh;object-fit:contain;
  border-radius:var(--shape-md,12px);
}
@keyframes fig-lightbox-in{from{opacity:0}to{opacity:1}}
@media (prefers-reduced-motion:reduce){.fig-lightbox{animation:none}}