/* ============================================================================
   5N3 Blog — knowledge base styles
   Layers on assets/theme.css (generated from Commons/theme.css). All colours,
   radii, shadows are theme tokens - no new hues, black/gray/white/red only.
   Layout: topbar + Obsidian-style sidebar + main column (+ TOC rail on docs).
   ========================================================================== */

/* ---- Reading progress ---------------------------------------------------- */
.progress-track { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 400; background: transparent; }
.progress-thumb { height: 100%; width: 0; background: var(--brand); transition: width 80ms linear; }

/* ---- Topbar --------------------------------------------------------------- */
/* Header geometry now comes from .c-topbar / .c-topbar-row in Commons - this
   file used to carry an identical copy of those rules, which is exactly the
   drift the shared chassis exists to prevent. The Blog opts OUT of the
   --contained modifier because its header spans the sidebar as well. */
.top-burger { display: none; width: 2.125rem; height: 2.125rem; border-radius: var(--radius-control); color: var(--text-secondary); }
.top-burger svg { width: 1.125rem; height: 1.125rem; }
.top-burger:hover { color: var(--text-primary); background: var(--surface-elevated); }
.top-search {
  display: inline-flex; align-items: center; gap: 0.5rem;
  margin-left: auto;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  font-size: 0.8125rem; color: var(--text-tertiary);
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), box-shadow var(--dur-med) var(--ease);
}
.top-search:hover { color: var(--text-secondary); border-color: var(--border-hover); box-shadow: 0 0 0 3px rgba(var(--brand-rgb), 0.08); }
.top-search svg { width: 0.875rem; height: 0.875rem; }
/* shared ecosystem chassis: text wordmark (accent N + suffix) + return pill */
.mk-suffix { margin-left: 0.375rem; }
.top-home {
  display: inline-flex; align-items: center;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--border); border-radius: var(--radius-full);
  font-size: 0.8125rem; font-weight: 500; color: var(--text-secondary);
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.top-home:hover { color: var(--text-primary); border-color: var(--border-hover); transform: translateY(-1px); }
kbd {
  font-family: inherit; font-size: 0.6875rem; font-weight: 600;
  padding: 0.0625rem 0.375rem;
  border: 1px solid var(--border); border-bottom-width: 2px;
  border-radius: 5px; color: var(--text-tertiary); background: var(--surface);
}

/* ---- Shell ---------------------------------------------------------------- */
.shell { display: grid; grid-template-columns: 16rem minmax(0, 1fr); max-width: 100rem; margin: 0 auto; }
.main { min-height: 80vh; padding: 0 clamp(1.25rem, 4vw, 4rem); max-width: 62rem; width: 100%; margin: 0 auto; }
.shell:has(.toc) { grid-template-columns: 16rem minmax(0, 1fr) 14rem; }

/* ---- Sidebar (Obsidian-ish) ------------------------------------------------ */
.sidebar {
  position: sticky; top: 3.4rem;
  height: calc(100vh - 3.4rem);
  overflow-y: auto;
  padding: 1.25rem 0.875rem 2rem;
  border-right: 1px solid var(--border);
  scrollbar-width: thin;
}
/* .side-search removed - the topbar search plus the Search view in EXPLORE
   already cover it. */
.side-group { margin-top: 1.5rem; }
/* First group sits flush against the sidebar's own padding now that nothing
   precedes it. */
.side-group:first-child { margin-top: 0; }
.side-label {
  font-size: 0.6563rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-tertiary);
  padding: 0 0.5rem; margin-bottom: 0.5rem;
}
.side-link {
  display: flex; align-items: center; gap: 0.625rem;
  padding: 0.4375rem 0.5rem; border-radius: var(--radius-control);
  font-size: 0.8438rem; font-weight: 500; color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.side-link:hover { color: var(--text-primary); background: var(--surface-elevated); }
.side-link.is-active { color: var(--text-primary); background: var(--surface-elevated); box-shadow: inset 2px 0 0 var(--brand); }
.side-ic { display: grid; place-items: center; width: 1rem; height: 1rem; color: var(--text-tertiary); }
.side-ic svg { width: 1rem; height: 1rem; }
.side-link.is-active .side-ic, .side-link:hover .side-ic { color: var(--brand-light); }
.side-count { margin-left: auto; font-size: 0.6875rem; color: var(--text-tertiary); border: 1px solid var(--border); border-radius: var(--radius-full); padding: 0 0.4375rem; }
.side-mini {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.3125rem 0.5rem; border-radius: var(--radius-control);
  font-size: 0.7813rem; color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.side-mini:hover { color: var(--text-primary); background: var(--surface-elevated); }
.side-mini svg { width: 0.8125rem; height: 0.8125rem; flex-shrink: 0; color: var(--text-tertiary); }
.side-mini span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-tags { display: flex; flex-wrap: wrap; gap: 0.375rem; padding: 0 0.5rem; }
.side-now { display: flex; align-items: center; gap: 0.5rem; padding: 0.25rem 0.5rem; font-size: 0.7813rem; color: var(--text-secondary); }
.now-dot { width: 0.4375rem; height: 0.4375rem; border-radius: 50%; background: var(--brand); box-shadow: 0 0 8px rgba(var(--brand-rgb), 0.8); flex-shrink: 0; }
@media (prefers-reduced-motion: no-preference) {
  .now-dot { animation: pulse 1.8s ease-in-out infinite; }
  @keyframes pulse { 50% { opacity: 0.45; } }
}
.shell-backdrop { display: none; }

/* ---- Pills & chips --------------------------------------------------------- */
.tag-pill { font-size: 0.6875rem; padding: 0.125rem 0.5625rem; cursor: pointer; transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease); }
.tag-pill:hover { color: var(--brand-light); border-color: var(--brand-light); }
.pill-draft { border-color: var(--caution); color: var(--caution); font-size: 0.6875rem; padding: 0.125rem 0.5rem; }
.diff-easy { border-color: rgba(79, 154, 108, 0.5); color: var(--success); }
.diff-mid { border-color: rgba(217, 164, 65, 0.5); color: var(--caution); }
.diff-hard { border-color: rgba(248, 113, 113, 0.5); color: var(--danger); }
.stack-chip {
  font-size: 0.6875rem; font-weight: 500;
  padding: 0.1875rem 0.5625rem;
  background: var(--surface-elevated); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-secondary);
}
.stack-row { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 0.875rem; }

/* ---- Hero ------------------------------------------------------------------- */
.hero { padding: clamp(3rem, 7vw, 5.5rem) 0 1rem; }
.hero h1 {
  margin-top: 1rem;
  font-size: clamp(2.125rem, 5vw, 3.375rem);
  font-weight: 800; letter-spacing: -0.035em; line-height: 1.06;
  color: var(--text-primary);
}
.hero-accent { color: var(--brand); }
.hero-sub { margin-top: 1.125rem; max-width: 38rem; font-size: 1.0313rem; color: var(--text-secondary); }
.hero-sub a { color: var(--brand-light); }
.hero-sub a:hover { text-decoration: underline; }
.hero-search {
  display: flex; align-items: center; gap: 0.75rem;
  width: 100%; max-width: 34rem;
  margin-top: 1.75rem; padding: 0.875rem 1.125rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; font-size: 0.9375rem; color: var(--text-tertiary);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease), transform var(--dur-med) var(--ease);
}
.hero-search:hover { border-color: var(--border-hover); transform: translateY(-1px); box-shadow: var(--shadow-card), 0 0 0 4px rgba(var(--brand-rgb), 0.07); }
.hero-search svg { width: 1.0625rem; height: 1.0625rem; color: var(--text-tertiary); }
.hero-search kbd { margin-left: auto; }
.hero-stats { display: flex; align-items: center; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; font-size: 0.8125rem; color: var(--text-tertiary); }
.hero-stats i { width: 3px; height: 3px; border-radius: 50%; background: var(--border-hover); }

/* ---- Sections ---------------------------------------------------------------- */
.section { padding-block: 2.25rem; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.section-title { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text-primary); }
.see-all { display: inline-flex; align-items: center; gap: 0.375rem; font-size: 0.8125rem; font-weight: 500; color: var(--text-tertiary); transition: color var(--dur-fast) var(--ease), gap var(--dur-fast) var(--ease); }
.see-all svg { width: 0.875rem; height: 0.875rem; }
.see-all:hover { color: var(--brand-light); gap: 0.5625rem; }

/* ---- Space cards --------------------------------------------------------------- */
.spaces-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 1rem; }
.space-card { display: flex; flex-direction: column; gap: 0.625rem; padding: 1.375rem; }
.space-ic {
  width: 2.375rem; height: 2.375rem;
  display: grid; place-items: center;
  border-radius: 10px;
  background: rgba(var(--brand-rgb), 0.1);
  border: 1px solid rgba(var(--brand-rgb), 0.22);
  color: var(--brand-light);
  transition: transform var(--dur-med) var(--ease);
}
.space-ic svg { width: 1.1875rem; height: 1.1875rem; }
.space-card:hover .space-ic { transform: scale(1.06); }
.space-foot { display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 0.5rem; }
.space-count { font-size: 0.75rem; color: var(--text-tertiary); }
.space-arrow { display: grid; place-items: center; color: var(--text-tertiary); transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease); }
.space-arrow svg { width: 0.9375rem; height: 0.9375rem; }
.c-card--interactive:hover .space-arrow { color: var(--brand-light); transform: translateX(3px); }

/* ---- Project cards --------------------------------------------------------------- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(17.5rem, 1fr)); gap: 1rem; }
.project-card { display: flex; flex-direction: column; gap: 0.625rem; }
.project-card--lg { padding: 1.5rem; }
.project-top { display: flex; align-items: center; gap: 0.5rem; }
.gh-mini { margin-left: auto; color: var(--text-tertiary); }
.gh-mini svg { width: 1rem; height: 1rem; }

/* ---- Post rows --------------------------------------------------------------------- */
.post-list { display: flex; flex-direction: column; }
.post-row {
  display: block; padding: 1.125rem 0.625rem;
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius-control);
  transition: background var(--dur-fast) var(--ease);
}
.post-row:hover { background: rgba(245, 245, 245, 0.025); }
.post-row:hover .post-title { color: var(--brand-light); }
.post-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem; font-size: 0.7813rem; color: var(--text-tertiary); }
.post-meta > svg { width: 0.8125rem; height: 0.8125rem; }
.row-col { display: inline-flex; align-items: center; gap: 0.375rem; color: var(--text-secondary); font-weight: 500; }
.row-col svg { width: 0.8125rem; height: 0.8125rem; color: var(--brand-light); }
.post-title { margin-top: 0.3125rem; font-size: 1.0938rem; font-weight: 600; letter-spacing: -0.01em; color: var(--text-primary); transition: color var(--dur-fast) var(--ease); }
.post-summary { margin-top: 0.3125rem; font-size: 0.9063rem; color: var(--text-secondary); max-width: 44rem; }
.post-tags { margin-top: 0.75rem; display: flex; flex-wrap: wrap; gap: 0.375rem; }

/* ---- Now strip ---------------------------------------------------------------------- */
.now-strip { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.375rem; }
.now-live { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--brand-light); flex-shrink: 0; }
.now-items { font-size: 0.875rem; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.now-strip .space-arrow { margin-left: auto; flex-shrink: 0; }

/* ---- Page head (collections, projects, timeline, now) -------------------------------- */
.page-head { display: flex; gap: 1.25rem; padding: clamp(2.5rem, 5vw, 4rem) 0 2rem; }
.page-ic {
  width: 3rem; height: 3rem; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(var(--brand-rgb), 0.1);
  border: 1px solid rgba(var(--brand-rgb), 0.22);
  color: var(--brand-light);
}
.page-ic svg { width: 1.5rem; height: 1.5rem; }
.page-head h1 { margin-top: 0.375rem; font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800; letter-spacing: -0.03em; color: var(--text-primary); }
.topic-row { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 1rem; }
.ext-link { display: inline-flex; align-items: center; gap: 0.375rem; margin-top: 1rem; font-size: 0.8125rem; font-weight: 500; color: var(--brand-light); }
.ext-link svg { width: 0.8125rem; height: 0.8125rem; }
.ext-link:hover { text-decoration: underline; }
.list-label { margin-top: 2rem; padding: 0; }
.empty-state { margin-top: 1.5rem; }
.empty-state a { color: var(--brand-light); }

/* ---- Article / docs layout -------------------------------------------------------------- */
.crumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem; padding-top: 2rem; font-size: 0.8125rem; color: var(--text-tertiary); }
.crumbs a { transition: color var(--dur-fast) var(--ease); }
.crumbs a:hover { color: var(--brand-light); }
.crumb-here { color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 18rem; }
.article { padding-bottom: 2rem; }
.article-head { margin-top: 1.5rem; }
.article-head h1 { font-size: clamp(1.875rem, 4.5vw, 2.75rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.12; color: var(--text-primary); }
.article-summary { margin-top: 0.875rem; font-size: 1.0625rem; color: var(--text-secondary); max-width: 42rem; }
.article-head .post-meta { margin-top: 1rem; }
.article-head .post-tags { margin-top: 0.875rem; }
.cover { margin-top: 2rem; border-radius: var(--radius-card); border: 1px solid var(--border); }
.project-head .project-top { margin-bottom: 0.875rem; }
.project-actions { display: flex; flex-wrap: wrap; gap: 0.625rem; margin-top: 1.25rem; }
.project-actions .c-btn { font-size: 0.875rem; padding: 0.5625rem 1.125rem; }
.project-actions svg { width: 1rem; height: 1rem; }

/* ---- TOC rail ------------------------------------------------------------------------------ */
.toc {
  position: sticky; top: 3.4rem;
  height: calc(100vh - 3.4rem);
  overflow-y: auto;
  padding: 2.5rem 1.25rem 2rem 0.5rem;
  font-size: 0.8125rem;
  display: none;
}
.toc ul { display: flex; flex-direction: column; gap: 0.125rem; border-left: 1px solid var(--border); }
.toc a {
  display: block; padding: 0.25rem 0 0.25rem 0.875rem;
  color: var(--text-tertiary);
  border-left: 2px solid transparent; margin-left: -1px;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.toc a:hover { color: var(--text-primary); }
.toc a.is-active { color: var(--brand-light); border-left-color: var(--brand); }
.toc-l2 a { padding-left: 0.875rem; }
.toc-l3 a { padding-left: 1.75rem; font-size: 0.7813rem; }

/* ---- Prose ----------------------------------------------------------------------------------- */
.prose { margin-top: 2.25rem; font-size: 1.0313rem; line-height: 1.8; color: var(--text-muted-title); }
.prose p { margin: 0 0 1.125em; }
.prose h2, .prose h3, .prose h4 { position: relative; color: var(--text-primary); scroll-margin-top: 5rem; }
.prose h2 { margin: 2.25em 0 0.75em; font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.prose h3 { margin: 1.75em 0 0.625em; font-size: 1.1875rem; font-weight: 600; }
.prose h4 { margin: 1.5em 0 0.5em; font-size: 1rem; font-weight: 600; }
.anchor { position: absolute; margin-left: 0.5rem; color: var(--text-tertiary); opacity: 0; transition: opacity var(--dur-fast) var(--ease); }
.prose h2:hover .anchor, .prose h3:hover .anchor, .prose h4:hover .anchor { opacity: 1; }
.anchor:hover { color: var(--brand-light); }
.prose a { color: var(--brand-light); text-decoration: underline; text-decoration-color: transparent; text-underline-offset: 3px; transition: text-decoration-color var(--dur-fast) var(--ease); }
.prose a:hover { text-decoration-color: var(--brand-light); }
.prose strong { color: var(--text-primary); font-weight: 600; }
.prose ul, .prose ol { margin: 0 0 1.125em; padding-left: 1.375rem; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.375em; }
.prose li::marker { color: var(--text-tertiary); }
.prose ul ul, .prose ol ol, .prose ul ol, .prose ol ul { margin: 0.375em 0 0; }
.prose code {
  background: var(--surface-elevated); border: 1px solid var(--border);
  border-radius: 5px; padding: 0.125em 0.375em;
  font-size: 0.8438em;
  font-family: ui-monospace, 'Cascadia Mono', 'Segoe UI Mono', Menlo, monospace;
}
.prose pre {
  margin: 0 0 1.25em; padding: 1.125rem 1.375rem;
  background: var(--nav-bg); border: 1px solid var(--border);
  border-radius: 10px; overflow-x: auto; line-height: 1.65;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: 0.8125em; }
.prose blockquote { margin: 0 0 1.125em; padding: 0.25em 0 0.25em 1.125em; border-left: 3px solid var(--brand); color: var(--text-secondary); }
.prose blockquote p { margin: 0; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.25em 0; }
.prose img { border-radius: var(--radius-card); border: 1px solid var(--border); margin: 0 0 1.25em; cursor: zoom-in; transition: transform var(--dur-med) var(--ease); }
.prose img:hover { transform: scale(1.005); }
.table-wrap { overflow-x: auto; margin: 0 0 1.25em; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.9063rem; }
.prose th { text-align: left; font-size: 0.6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-secondary); padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border-hover); }
.prose td { padding: 0.5625rem 0.75rem; border-bottom: 1px solid var(--border); }
.mermaid { display: flex; justify-content: center; background: var(--nav-bg); border: 1px solid var(--border); border-radius: 10px; padding: 1.25rem; margin: 0 0 1.25em; }

/* callouts */
.callout { margin: 0 0 1.25em; padding: 0.875rem 1.125rem; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); }
.callout p { margin: 0.375rem 0 0; font-size: 0.9375rem; }
.callout-head { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8125rem; font-weight: 600; }
.callout-head svg { width: 1rem; height: 1rem; }
.callout--note { border-color: rgba(245, 245, 245, 0.14); }
.callout--note .callout-head { color: var(--text-primary); }
.callout--tip { border-color: rgba(79, 154, 108, 0.4); }
.callout--tip .callout-head { color: var(--success); }
.callout--warning { border-color: rgba(217, 164, 65, 0.45); }
.callout--warning .callout-head { color: var(--caution); }

/* terminal window */
.term { margin: 0 0 1.25em; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--nav-bg); }
.term-bar { display: flex; align-items: center; gap: 0.375rem; padding: 0.5625rem 0.875rem; border-bottom: 1px solid var(--border); background: var(--surface); }
.term-bar span { width: 0.6875rem; height: 0.6875rem; border-radius: 50%; background: var(--surface-elevated); border: 1px solid var(--border); }
.term-bar span:first-child { background: rgba(var(--brand-rgb), 0.55); border-color: transparent; }
.term-bar em { margin-left: 0.5rem; font-style: normal; font-size: 0.6875rem; color: var(--text-tertiary); }
.term pre { margin: 0; padding: 1rem 1.25rem; overflow-x: auto; line-height: 1.65; }
.term code { font-size: 0.8125em; font-family: ui-monospace, 'Cascadia Mono', 'Segoe UI Mono', Menlo, monospace; color: var(--text-muted-title); }

/* ---- Series ------------------------------------------------------------------------------------ */
.series-banner { margin-top: 2rem; padding: 1rem 1.25rem; display: flex; align-items: center; flex-wrap: wrap; gap: 0.625rem 1rem; font-size: 0.9375rem; color: var(--text-secondary); }
.series-banner strong { color: var(--text-primary); }
.series-parts { display: flex; gap: 0.375rem; margin-left: auto; }
.series-part { width: 1.75rem; height: 1.75rem; display: grid; place-items: center; border: 1px solid var(--border); border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 600; color: var(--text-secondary); transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease); }
.series-part:hover { color: var(--text-primary); border-color: var(--border-hover); }
.series-part.is-current { background: var(--brand); border-color: var(--brand); color: #fff; }
.series-nav { margin-top: 3rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.series-nav .c-btn { font-size: 0.875rem; padding: 0.625rem 1.125rem; }

/* ---- Related + prev/next ------------------------------------------------------------------------ */
.related { margin-top: 3rem; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr)); gap: 0.875rem; margin-top: 0.875rem; }
.related-card { padding: 1.125rem; }
.related-title { margin-top: 0.375rem; font-size: 0.9375rem; font-weight: 600; color: var(--text-primary); }
.pn { margin-top: 2.5rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.875rem; }
.pn-card { display: flex; flex-direction: column; gap: 0.375rem; padding: 1rem 1.25rem; font-size: 0.9063rem; font-weight: 500; color: var(--text-primary); }
.pn-card .side-label { margin: 0; padding: 0; }
.pn-next { text-align: right; align-items: flex-end; }

/* ---- Timeline ------------------------------------------------------------------------------------ */
.timeline { position: relative; padding: 0.5rem 0 2rem 1.25rem; }
.timeline::before { content: ''; position: absolute; left: 0.3125rem; top: 0; bottom: 0; width: 2px; background: var(--border); }
.tl-item { position: relative; margin-bottom: 1.125rem; }
.tl-marker { position: absolute; left: -1.25rem; top: 1.375rem; width: 0.8125rem; height: 0.8125rem; border-radius: 50%; background: var(--bg); border: 2px solid var(--border-hover); transform: translateX(-38%); }
.tl-done .tl-marker { border-color: var(--border-hover); }
.tl-now .tl-marker { border-color: var(--brand); background: var(--brand); box-shadow: 0 0 10px rgba(var(--brand-rgb), 0.7); }
.tl-next .tl-marker { border-style: dashed; }
.tl-next .tl-body { border-style: dashed; opacity: 0.85; }
.tl-body { padding: 1.125rem 1.375rem; }
.tl-title { margin-top: 0.3125rem; font-size: 1.0313rem; font-weight: 600; color: var(--text-primary); }

/* ---- Now page ------------------------------------------------------------------------------------- */
.now-prose h2 { margin-top: 1.75em; }

/* ---- Search modal ----------------------------------------------------------------------------------- */
.search-modal {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: grid; place-items: start center;
  padding: clamp(3rem, 12vh, 8rem) 1rem 2rem;
}
.search-modal[hidden] { display: none; }
.search-panel {
  width: 100%; max-width: 36rem;
  background: var(--surface);
  border: 1px solid var(--border-hover);
  border-radius: 14px;
  box-shadow: var(--shadow-card-hover);
  overflow: hidden;
  animation: search-in 160ms var(--ease);
}
@keyframes search-in { from { opacity: 0; transform: translateY(-8px) scale(0.985); } }
.search-head { display: flex; align-items: center; gap: 0.75rem; padding: 0.875rem 1.125rem; border-bottom: 1px solid var(--border); }
.search-head svg { width: 1.0625rem; height: 1.0625rem; color: var(--text-tertiary); flex-shrink: 0; }
.search-head input { flex: 1; background: none; border: 0; outline: 0; font: inherit; font-size: 0.9688rem; color: var(--text-primary); }
.search-head input::placeholder { color: var(--text-tertiary); }
.search-results { max-height: 22rem; overflow-y: auto; padding: 0.5rem; }
.search-hint { padding: 1.25rem; font-size: 0.875rem; color: var(--text-tertiary); text-align: center; }
.sr-item { display: block; padding: 0.625rem 0.875rem; border-radius: var(--radius-control); }
.sr-item.is-sel, .sr-item:hover { background: var(--surface-elevated); }
.sr-top { display: flex; align-items: center; gap: 0.5rem; font-size: 0.6875rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-tertiary); }
.sr-title { font-size: 0.9063rem; font-weight: 600; color: var(--text-primary); margin-top: 0.125rem; }
.sr-item.is-sel .sr-title { color: var(--brand-light); }
.sr-sub { font-size: 0.8125rem; color: var(--text-secondary); margin-top: 0.125rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---- Lightbox ----------------------------------------------------------------------------------------- */
.lightbox { position: fixed; inset: 0; z-index: 600; background: rgba(0, 0, 0, 0.88); display: grid; place-items: center; padding: 2rem; cursor: zoom-out; animation: search-in 160ms var(--ease); }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 100%; max-height: 100%; border-radius: var(--radius-card); }

/* ============================================================================
   INFORMATION ARCHITECTURE - visual weight
   ----------------------------------------------------------------------------
   Nothing below introduces a new colour, font, radius, shadow or spacing value.
   Everything is built from the existing tokens. The ONLY thing these rules add
   is hierarchy: projects read larger than topics, topics larger than views.

     LAYER 1  projects   .project-card / .side-project / .proj-*
     LAYER 2  topics     .topic-tile / .topic-card / .side-link
     LAYER 3  views      .view-chip / .side-view / .arc-*

   If you ever find yourself giving a topic the same size as a project, the
   architecture has drifted. That size difference IS the information.
   ========================================================================== */

/* ---- Sidebar: three layers ------------------------------------------------------------- */
.side-label { display: flex; align-items: center; justify-content: space-between; }
.side-label-all {
  font-size: 0.6563rem; font-weight: 600; letter-spacing: 0.06em;
  color: var(--text-tertiary); text-transform: uppercase;
  transition: color var(--dur-fast) var(--ease);
}
.side-label-all:hover { color: var(--brand-light); }

/* LAYER 1 - largest sidebar item. Product name, weightier type, status dot. */
.side-project {
  display: flex; align-items: center; gap: 0.5625rem;
  padding: 0.5rem 0.5rem; border-radius: var(--radius-control);
  /* Larger than .side-link (topics) and .side-view (views) on purpose.
     Size ladder: project 0.9063 > topic 0.8438 > view 0.7813. */
  font-size: 0.9063rem; font-weight: 600; color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.side-project:hover { color: var(--text-primary); background: var(--surface-elevated); }
.side-project.is-active { color: var(--text-primary); background: var(--surface-elevated); box-shadow: inset 2px 0 0 var(--brand); }
.side-project-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-dot { width: 0.4375rem; height: 0.4375rem; border-radius: 50%; flex-shrink: 0; }
.dot-live { background: var(--success); box-shadow: 0 0 7px rgba(79, 154, 108, 0.7); }
.dot-wip { background: var(--brand); box-shadow: 0 0 7px rgba(var(--brand-rgb), 0.7); }
.dot-plan { background: var(--border-hover); }

/* LAYER 3 - smallest, quietest. A view is only a way to look at things. */
.side-view {
  display: flex; align-items: center; gap: 0.625rem; width: 100%;
  padding: 0.3125rem 0.5rem; border-radius: var(--radius-control);
  font-size: 0.7813rem; font-weight: 400; color: var(--text-tertiary);
  text-align: left;
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.side-view:hover { color: var(--text-secondary); background: var(--surface-elevated); }
.side-view.is-active { color: var(--text-primary); background: var(--surface-elevated); box-shadow: inset 2px 0 0 var(--brand); }
.side-view .side-ic svg { width: 0.875rem; height: 0.875rem; }
.side-view kbd { margin-left: auto; }
.side-group--views { padding-top: 0.25rem; }

/* ---- Homepage: layer eyebrows + flagship section ---------------------------------------- */
.section-head .c-eyebrow { margin-bottom: 0.25rem; }
.section-title--lg { font-size: 1.5rem; }
.section--flagship { padding-top: 1.5rem; }

/* LAYER 1 - project cards. Feature variant is the largest object on the site. */
.projects-grid--feature { grid-template-columns: repeat(auto-fill, minmax(21rem, 1fr)); gap: 1.125rem; }
.project-card--feature { padding: 1.625rem 1.75rem; gap: 0.75rem; }
.project-card-title { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text-primary); }
.project-card--feature .project-card-title { font-size: 1.375rem; }
.project-card-foot {
  display: flex; align-items: center; gap: 0.5rem; margin-top: auto; padding-top: 1rem;
  font-size: 0.75rem; color: var(--text-tertiary);
}
.project-card-foot .space-arrow { margin-left: auto; }

/* LAYER 2 - topic tiles. Deliberately one row tall: a topic is a doorway, not
   a product. Never let these grow to project-card size. */
.topics-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 0.625rem; }
.topic-tile { display: flex; align-items: center; gap: 0.75rem; padding: 0.8125rem 1rem; }
.topic-ic {
  display: grid; place-items: center; width: 1.875rem; height: 1.875rem; flex-shrink: 0;
  border-radius: var(--radius-control); border: 1px solid var(--border);
  background: var(--surface-elevated); color: var(--brand-light);
}
.topic-ic svg { width: 0.9375rem; height: 0.9375rem; }
.topic-tile-body { display: flex; flex-direction: column; gap: 0.0625rem; min-width: 0; }
.topic-tile-name { font-size: 0.9063rem; font-weight: 600; color: var(--text-primary); }
.topic-tile-count { font-size: 0.7188rem; color: var(--text-tertiary); }
.topic-tile .space-arrow { margin-left: auto; }

/* Topics index page - roomier than a tile, still smaller than a project card. */
.topic-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: 1rem; }
.topic-card { display: flex; flex-direction: column; gap: 0.625rem; padding: 1.375rem; }

/* ---- Article metadata card -------------------------------------------------------------- */
/* The one place every article answers "where do I belong?" - same six cells,
   same order, every time. */
.meta-card {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px; margin-top: 1.75rem; padding: 0; overflow: hidden;
  background: var(--border);
}
.meta-cell { padding: 0.875rem 1.125rem; background: var(--surface); }
.meta-cell dt {
  font-size: 0.6563rem; font-weight: 600; letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--text-tertiary);
}
.meta-cell dd { margin-top: 0.375rem; font-size: 0.8438rem; color: var(--text-secondary); }
.meta-none { color: var(--text-tertiary); }
.meta-project, .meta-topic {
  display: inline-flex; align-items: center; gap: 0.4375rem; font-weight: 600;
  color: var(--text-primary); transition: color var(--dur-fast) var(--ease);
}
.meta-project:hover, .meta-topic:hover { color: var(--brand-light); }
.meta-topic svg { width: 0.875rem; height: 0.875rem; color: var(--brand-light); }

/* Article rows carry both coordinates. Project reads stronger than topic
   because a project is the bigger object. */
.row-project { display: inline-flex; align-items: center; gap: 0.375rem; color: var(--text-primary); font-weight: 600; }
.row-project svg { width: 0.8125rem; height: 0.8125rem; color: var(--brand-light); }

/* ---- Project (product) page ------------------------------------------------------------- */
.fact-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1px; margin-top: 1.75rem; overflow: hidden;
  border: 1px solid var(--border); border-radius: var(--radius-card); background: var(--border);
}
.fact { display: flex; flex-direction: column; gap: 0.375rem; padding: 0.875rem 1.125rem; background: var(--surface); }
.fact-k { font-size: 0.6563rem; font-weight: 600; letter-spacing: 0.09em; text-transform: uppercase; color: var(--text-tertiary); }
.fact-v { font-size: 0.875rem; font-weight: 600; color: var(--text-primary); }

.proj-nav { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 1.75rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--border); }
.proj-nav-chip {
  padding: 0.3125rem 0.75rem; border-radius: var(--radius-full);
  border: 1px solid var(--border); background: var(--surface);
  font-size: 0.75rem; font-weight: 500; color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.proj-nav-chip:hover { color: var(--brand-light); border-color: var(--brand-light); }

.proj-section { margin-top: 3rem; scroll-margin-top: 5rem; }
.proj-h {
  display: flex; align-items: center; gap: 0.5625rem;
  font-size: 1.375rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text-primary);
}
.proj-h svg { width: 1.125rem; height: 1.125rem; color: var(--brand-light); }
.proj-lead { margin-top: 0.5rem; font-size: 0.875rem; color: var(--text-tertiary); }
.proj-section .post-list, .proj-section .timeline, .proj-section .gallery { margin-top: 1.25rem; }
.stack-row--lg { gap: 0.4375rem; }
.stack-row--lg .stack-chip { font-size: 0.7813rem; padding: 0.25rem 0.6875rem; }

/* Gallery */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); gap: 1rem; }
.shot { display: flex; flex-direction: column; gap: 0.5rem; }
.shot img { width: 100%; border-radius: var(--radius-card); border: 1px solid var(--border); cursor: zoom-in; }
.shot figcaption { font-size: 0.7813rem; color: var(--text-tertiary); }

/* Roadmap */
.roadmap { display: flex; flex-direction: column; margin-top: 1.25rem; }
.rm-item {
  display: flex; align-items: center; gap: 0.875rem;
  padding: 0.8125rem 0; border-bottom: 1px solid var(--border);
}
.rm-item:last-child { border-bottom: 0; }
.rm-marker { width: 0.5625rem; height: 0.5625rem; border-radius: 50%; flex-shrink: 0; border: 2px solid var(--border-hover); }
.rm-done .rm-marker { background: var(--success); border-color: var(--success); }
.rm-now .rm-marker { background: var(--brand); border-color: var(--brand); box-shadow: 0 0 9px rgba(var(--brand-rgb), 0.7); }
.rm-label { font-size: 0.9375rem; color: var(--text-secondary); }
.rm-done .rm-label { color: var(--text-tertiary); }
.rm-now .rm-label { color: var(--text-primary); font-weight: 600; }
.rm-state {
  margin-left: auto; font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--text-tertiary); white-space: nowrap;
}
.rm-done .rm-state { color: var(--success); }
.rm-now .rm-state { color: var(--brand-light); }

/* Downloads */
.dl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 0.75rem; margin-top: 1.25rem; }
.dl-card { display: flex; align-items: center; gap: 0.875rem; padding: 1rem 1.125rem; }
.dl-ic { display: grid; place-items: center; width: 2rem; height: 2rem; flex-shrink: 0; border-radius: var(--radius-control); border: 1px solid var(--border); background: var(--surface-elevated); color: var(--brand-light); }
.dl-ic svg { width: 0.9375rem; height: 0.9375rem; }
.dl-body { display: flex; flex-direction: column; gap: 0.0625rem; min-width: 0; }
.dl-label { font-size: 0.875rem; font-weight: 600; color: var(--text-primary); }
.dl-kind { font-size: 0.6875rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-tertiary); }

/* Project chips on a topic page - keeps layer 1 visible from inside layer 2. */
.proj-strip { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.875rem; }
.proj-chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.375rem 0.8125rem; border-radius: var(--radius-full);
  border: 1px solid var(--border); background: var(--surface);
  font-size: 0.8125rem; font-weight: 600; color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.proj-chip:hover { color: var(--text-primary); border-color: var(--border-hover); transform: translateY(-1px); }

/* ---- LAYER 3: view pages ---------------------------------------------------------------- */
/* All five views share one header and one switcher so they read as lenses over
   the same content rather than five more categories. */
.page-ic--view { color: var(--text-tertiary); }
.view-switch { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 1.125rem; }
.view-chip {
  padding: 0.3125rem 0.8125rem; border-radius: var(--radius-full);
  border: 1px solid var(--border); background: var(--surface);
  font-size: 0.75rem; font-weight: 500; color: var(--text-tertiary);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.view-chip:hover { color: var(--text-primary); border-color: var(--border-hover); }
.view-chip.is-active { color: var(--text-primary); border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); }
.timeline--compact .tl-body { padding: 0.875rem 1.125rem; }
.timeline--compact .tl-title { font-size: 0.9375rem; }

/* Archive - the densest view in the system. Deliberately plain: it is an
   index, not a browse experience. */
.arc-year { margin-top: 2.5rem; }
.arc-year-head { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: 0.625rem; border-bottom: 1px solid var(--border); }
.arc-year-head h2 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text-primary); }
.arc-year-head span { font-size: 0.75rem; color: var(--text-tertiary); }
.arc-list { display: flex; flex-direction: column; }
.arc-item { display: flex; align-items: center; gap: 1rem; padding: 0.625rem 0; border-bottom: 1px solid var(--border); }
.arc-item:last-child { border-bottom: 0; }
.arc-link { display: flex; align-items: baseline; gap: 0.875rem; min-width: 0; flex: 1; }
.arc-date { font-size: 0.75rem; color: var(--text-tertiary); white-space: nowrap; min-width: 4.5rem; }
.arc-title { font-size: 0.9063rem; color: var(--text-secondary); transition: color var(--dur-fast) var(--ease); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.arc-link:hover .arc-title { color: var(--brand-light); }
.arc-meta { display: flex; gap: 0.375rem; flex-shrink: 0; }
.arc-tag { font-size: 0.6875rem; color: var(--text-tertiary); border: 1px solid var(--border); border-radius: var(--radius-full); padding: 0.0625rem 0.5rem; white-space: nowrap; }
.arc-tag--project { color: var(--text-secondary); border-color: var(--border-hover); }

/* ---- Reveal ------------------------------------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); }
  .reveal.in-view { animation: rise 600ms var(--ease) forwards; animation-delay: calc(var(--i, 0) * 70ms); }
  @keyframes rise { to { opacity: 1; transform: translateY(0); } }
}

/* ---- Footer -------------------------------------------------------------------------------------------- */
.site-footer { margin-top: 3rem; border-top: 1px solid var(--border); }
.footer-row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; padding-block: 1.75rem; font-size: 0.8125rem; color: var(--text-tertiary); }
.footer-row a { transition: color var(--dur-fast) var(--ease); }
.footer-row a:hover { color: var(--brand-light); }

/* ---- Responsive ------------------------------------------------------------------------------------------ */
@media (min-width: 1280px) {
  .main.has-toc ~ .toc, .shell .toc { display: block; }
}
@media (max-width: 1279.98px) {
  .shell, .shell:has(.toc) { grid-template-columns: 16rem minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 900px) {
  .shell, .shell:has(.toc) { grid-template-columns: minmax(0, 1fr); }
  .top-burger { display: grid; place-items: center; }
  .sidebar {
    position: fixed; left: 0; top: 3.4rem; bottom: 0; z-index: 350;
    width: min(18rem, 84vw);
    background: var(--nav-bg);
    border-right: 1px solid var(--border);
    transform: translateX(-102%);
    transition: transform 240ms var(--ease);
  }
  .sidebar.is-open { transform: translateX(0); box-shadow: var(--shadow-card-hover); }
  .shell-backdrop { display: block; position: fixed; inset: 3.4rem 0 0; z-index: 340; background: rgba(0, 0, 0, 0.55); opacity: 0; pointer-events: none; transition: opacity 240ms var(--ease); }
  .shell-backdrop.is-open { opacity: 1; pointer-events: auto; }
  .top-search span { display: none; }
  .pn { grid-template-columns: 1fr; }
  .page-head { flex-direction: column; gap: 1rem; }
  .meta-card { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .arc-item { flex-wrap: wrap; gap: 0.5rem; }
  .arc-link { flex-basis: 100%; }
  .arc-meta { padding-left: 5.375rem; }
}
@media (max-width: 560px) {
  .meta-card { grid-template-columns: minmax(0, 1fr); }
  .arc-link { flex-wrap: wrap; gap: 0.25rem; }
  .arc-meta { padding-left: 0; }
}