/* ============================================================
   nl2protocol — landing page styles
   Aesthetic: academic paper meets terminal.
   Palette: solarized-light family (echoes the live-mode report).
   Type: EB Garamond (display + body), JetBrains Mono (code, nav).
   ============================================================ */

:root {
  /* Cool slate palette — biotech / lab-software register
     (Benchling / Latch / Inductive Bio family).
     Replaced solarized-warm with Tailwind's slate scale for the
     surfaces, more-saturated accents for the cite hues. */
  --bg:       #f7f6f3;  /* Notion off-white — tiny warm cast      */
  --panel:    #ffffff;  /* pure white — cards/panels              */
  --panel-2:  #efeeea;  /* warm-neutral — alternate panel         */
  --ink:      #0f172a;  /* slate-900 — primary text               */
  --ink-2:    #020617;  /* slate-950 — emphasized text            */
  --dim:      #475569;  /* slate-600 — secondary text             */
  --dim-2:    #94a3b8;  /* slate-400 — tertiary text              */
  --grid:     #e2e8f0;  /* slate-200 — borders                    */
  --rule:     #cbd5e1;  /* slate-300 — stronger rules             */

  /* Provenance hues — saturated to fit the cooler palette.
     Same semantic mapping as v1/v2 (blue=instruction, yellow=domain
     default, orange=inferred, green=reviewer agree, red=disagree). */
  --cite-instr:    #2563eb;  /* blue-600   — from instruction      */
  --cite-domain:   #d97706;  /* amber-600  — domain default        */
  --cite-infer:    #ea580c;  /* orange-600 — inferred              */
  --cite-agree:    #16a34a;  /* green-600  — reviewer agree        */
  --cite-disagree: #dc2626;  /* red-600    — reviewer disagree     */

  /* Typography — sans-forward for "technical product" feel.
     Variable name is legacy (was "serif" pre-experiment); kept to
     avoid a search-and-replace churn. */
  --font-serif: "IBM Plex Sans", -apple-system, BlinkMacSystemFont,
                "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo,
                Consolas, monospace;

  /* Layout — wider than v1; less reading-column, more data-display */
  --width-page: 1280px;
  --width-text: 800px;
  --gutter: 2rem;
}

/* ---------- Reset / base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  /* Sans appears visually larger than serif at the same point size; 17px
     keeps overall density similar to the v1 academic look. */
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  /* Cool palette doesn't want the warm radial; flat surface reads
     "lab software" cleaner. */
  background: var(--bg);
}

a { color: inherit; }

::selection {
  background: color-mix(in srgb, var(--cite-instr) 25%, transparent);
  color: var(--ink-2);
}

/* ---------- Layout containers ---------- */

.site-header,
main > section,
.site-footer > * {
  max-width: var(--width-page);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ---------- Header ---------- */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 1.6rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--grid);
}

.brand {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.96rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-mark {
  position: relative;
}

.brand-mark::after {
  /* The signature: a colored underline echoing the cited-text motif */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  background: var(--cite-instr);
}

.brand:hover .brand-mark::after {
  background: var(--cite-infer);
  transition: background 200ms ease;
}

.primary-nav {
  display: flex;
  gap: 1.5rem;
}

.primary-nav a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--dim);
  text-decoration: none;
  text-transform: lowercase;
  letter-spacing: 0.01em;
  padding: 0.2rem 0;
  position: relative;
  transition: color 150ms ease;
}

.primary-nav a:hover {
  color: var(--ink);
}

.primary-nav a:hover::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--cite-instr);
}

.ext {
  display: inline-block;
  font-size: 0.85em;
  color: var(--dim-2);
  margin-left: 0.05em;
}

/* ---------- Hero ---------- */

.hero {
  padding-top: 6rem;
  padding-bottom: 5rem;
  max-width: 980px;
}

.meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
  letter-spacing: 0.04em;
  text-transform: lowercase;
  margin: 0 0 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  align-items: center;
}

.meta .sep {
  color: var(--dim-2);
  opacity: 0.7;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--cite-agree);
  font-weight: 500;
}

.live-dot {
  width: 7px;
  height: 7px;
  background: var(--cite-agree);
  border-radius: 50%;
  animation: pulse 1.8s ease-in-out infinite;
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--cite-agree) 50%, transparent);
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 color-mix(in srgb, var(--cite-agree) 40%, transparent); }
  50%      { opacity: 0.5; box-shadow: 0 0 0 6px color-mix(in srgb, var(--cite-agree) 0%, transparent); }
}

.hero-pitch {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.6rem, 3.8vw, 2.55rem);
  line-height: 1.22;
  letter-spacing: -0.012em;
  margin: 0 0 1.5rem;
  color: var(--ink-2);
}

.hero-pitch .dash {
  color: var(--dim);
  font-weight: 400;
  margin: 0 0.1em;
}

/* ---------- Cited text — the visual signature ---------- */

.cite {
  position: relative;
  cursor: help;
  text-decoration: none;
  border-bottom: 2.5px solid;
  padding-bottom: 1px;
  transition: background-color 180ms ease, border-color 180ms ease;
  outline: none;
}

.cite-instr  { border-color: var(--cite-instr); }
.cite-domain { border-color: var(--cite-domain); }
.cite-infer  { border-color: var(--cite-infer); }
.cite-agree  { border-color: var(--cite-agree); }

.cite-instr:hover,
.cite-instr:focus  { background: color-mix(in srgb, var(--cite-instr)  14%, transparent); }
.cite-domain:hover,
.cite-domain:focus { background: color-mix(in srgb, var(--cite-domain) 14%, transparent); }
.cite-infer:hover,
.cite-infer:focus  { background: color-mix(in srgb, var(--cite-infer)  14%, transparent); }
.cite-agree:hover,
.cite-agree:focus  { background: color-mix(in srgb, var(--cite-agree)  14%, transparent); }

/* Tooltip — appears above the cite on hover/focus */
.cite::after {
  content: attr(data-prov);
  position: absolute;
  bottom: calc(100% + 0.65rem);
  left: 0;
  background: var(--ink-2);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.4rem 0.7rem;
  white-space: nowrap;
  max-width: 90vw;
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
  border-radius: 2px;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  z-index: 10;
  /* Small arrow */
  border-bottom: 4px solid transparent; /* spacing trick — actual arrow via ::before */
}

.cite::before {
  content: "";
  position: absolute;
  bottom: calc(100% + 0.3rem);
  left: 1rem;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--ink-2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
  z-index: 11;
}

.cite:hover::after,
.cite:focus::after,
.cite:hover::before,
.cite:focus::before {
  opacity: 1;
  transform: translateY(0);
}

/* Tooltip text may be long; allow wrapping when needed */
.cite[data-prov*=" "]:hover::after {
  white-space: normal;
  max-width: 320px;
}

/* ---------- Hero aside + CTA + legend ---------- */

.hero-aside {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.0rem;
  color: var(--dim);
  margin: 0 0 2.5rem;
  max-width: 42ch;
}

.hero-aside .aside-note {
  color: var(--ink-2);
  font-style: italic;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 3.5rem;
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.75rem 1.4rem;
  text-decoration: none;
  border: 1.5px solid transparent;
  text-transform: lowercase;
  letter-spacing: 0.025em;
  transition: background 180ms ease, color 180ms ease,
              border-color 180ms ease, transform 100ms ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.btn-primary {
  background: var(--ink-2);
  color: var(--bg);
  border-color: var(--ink-2);
}

.btn-primary:hover {
  background: var(--cite-instr);
  border-color: var(--cite-instr);
}

.btn-primary .arrow {
  transition: transform 200ms ease;
}

.btn-primary:hover .arrow {
  transform: translateX(3px);
}

.btn-secondary {
  background: transparent;
  color: var(--ink-2);
  border-color: var(--rule);
}

.btn-secondary:hover {
  border-color: var(--ink-2);
  background: color-mix(in srgb, var(--ink) 4%, transparent);
}

.btn:active {
  transform: translateY(1px);
}

/* Legend — soft introduction to the cite palette */
.legend {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--dim);
  text-transform: lowercase;
  letter-spacing: 0.02em;
}

.legend li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.swatch {
  display: inline-block;
  width: 18px;
  height: 3px;
  border-radius: 1px;
}

.sw-instr  { background: var(--cite-instr); }
.sw-domain { background: var(--cite-domain); }
.sw-infer  { background: var(--cite-infer); }
.sw-agree  { background: var(--cite-agree); }

/* ---------- Hero stats bar — quantitative anchor ---------- */

.stats-bar {
  margin: 2.5rem 0 0;
  padding: 1.4rem 0 0;
  border-top: 1px solid var(--grid);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem 2rem;
}

.stats-bar .stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin: 0;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0;
  order: 2;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--ink-2);
  margin: 0;
  line-height: 1;
  order: 1;
  /* Subtle baseline accent — colored underline echoing the cite motif */
  display: inline-block;
  border-bottom: 2px solid var(--cite-instr);
  padding-bottom: 0.25rem;
  align-self: flex-start;
}

.stats-bar .stat:nth-child(1) .stat-value { border-bottom-color: var(--cite-instr); }
.stats-bar .stat:nth-child(2) .stat-value { border-bottom-color: var(--cite-domain); }
.stats-bar .stat:nth-child(3) .stat-value { border-bottom-color: var(--cite-agree); }
.stats-bar .stat:nth-child(4) .stat-value { border-bottom-color: var(--cite-infer); }

@media (max-width: 720px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem 1.5rem;
  }
  .stat-value { font-size: 1.5rem; }
}

/* ---------- Generic section ---------- */

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
  border-top: 1px solid var(--grid);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--dim);
  margin: 0 0 3rem;
  /* Marginal label — sits on the left margin like an academic paper section */
  display: inline-block;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--grid);
}

/* ---------- How it works ---------- */

.how-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.how-panel {
  background: var(--panel);
  border: 1px solid var(--grid);
  border-top-width: 3px;
  padding: 1.6rem 1.6rem 1.4rem;
  display: flex;
  flex-direction: column;
  min-height: 280px;
  position: relative;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.how-panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -16px rgba(7, 54, 66, 0.25);
}

.how-panel-1 { border-top-color: var(--cite-instr); }
.how-panel-2 { border-top-color: var(--cite-domain); }
.how-panel-3 { border-top-color: var(--cite-agree); }

.how-header {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin: 0 0 1rem;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dim-2);
  letter-spacing: 0.04em;
}

.how-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink-2);
}

.how-body {
  font-size: 0.98rem;
  line-height: 1.6;
  margin: 0 0 1.5rem;
  color: var(--ink);
}

.how-body em {
  font-style: italic;
  color: var(--ink-2);
}

.how-meta {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px dashed var(--rule);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--dim);
}

.how-meta-key {
  text-transform: lowercase;
  letter-spacing: 0.06em;
}

.how-meta-val {
  font-family: var(--font-mono);
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  color: var(--ink-2);
  font-size: 0.74rem;
}

/* ---------- Differentiation list ---------- */

.diff {
  max-width: var(--width-text);
}

.diff-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: diff;
}

.diff-item {
  counter-increment: diff;
  margin: 0 0 2.4rem;
  padding-left: 4rem;
  position: relative;
}

.diff-item::before {
  content: counter(diff, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--dim-2);
  letter-spacing: 0.04em;
  /* Subtle underline accent in the cite palette per item */
}

.diff-item:nth-child(1)::after,
.diff-item:nth-child(2)::after,
.diff-item:nth-child(3)::after {
  content: "";
  position: absolute;
  left: 0;
  top: 1.5rem;
  width: 28px;
  height: 2px;
}

.diff-item:nth-child(1)::after { background: var(--cite-instr); }
.diff-item:nth-child(2)::after { background: var(--cite-domain); }
.diff-item:nth-child(3)::after { background: var(--cite-agree); }

.diff-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.005em;
  color: var(--ink-2);
}

.diff-body {
  font-size: 1.0rem;
  line-height: 1.65;
  margin: 0;
  color: var(--ink);
}

/* ---------- Figure ---------- */

.figure {
  /* Wider than text column — let the screenshot breathe.
     On large viewports, break out of the page max-width and span
     ~75% of the viewport. Capped at 1700px so ultrawide monitors
     don't make the image absurdly large. min() floor keeps the
     figure at the default page-width on smaller viewports so this
     override never NARROWS the figure. */
}

main > section.figure {
  max-width: min(max(var(--width-page), 75vw), 1700px);
}

.screenshot {
  margin: 0;
}

.screenshot-frame {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--grid);
  /* Subtle frame shadow to feel like a printed plate */
  box-shadow:
    0 1px 0 var(--rule),
    0 24px 48px -24px rgba(7, 54, 66, 0.18);
  overflow: hidden;
}

.screenshot-frame img {
  display: block;
  width: 100%;
  height: auto;
}

/* Placeholder shown until the real screenshot is wired.
   Hides automatically once the <img> loads (broken-img fallback below
   replaces it visually). */
.screenshot-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--dim);
  background:
    repeating-linear-gradient(
      135deg,
      var(--panel) 0 14px,
      var(--panel-2) 14px 28px
    );
  min-height: 320px;
  letter-spacing: 0.02em;
}

.screenshot-placeholder small {
  font-size: 0.72rem;
  color: var(--dim-2);
}

.screenshot-placeholder code {
  font-family: var(--font-mono);
  background: var(--bg);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
  color: var(--ink-2);
}

/* When the actual image successfully loads, it stacks ON TOP of
   the placeholder (z-index default). Place a covering layer so the
   placeholder isn't visible behind transparent corners of a real
   screenshot. */
.screenshot-frame img:not([alt=""]) {
  position: relative;
  z-index: 2;
  background: var(--panel);
}

figcaption {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--dim);
  margin: 1.2rem 0 0;
  max-width: var(--width-text);
}

.fig-num {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-2);
  margin-right: 0.5rem;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--grid);
  margin-top: 3rem;
  padding-top: 3rem;
  padding-bottom: 4rem;
  /* Subtle cool gradient — slightly more saturated than the page bg */
  background: linear-gradient(to bottom,
    var(--bg) 0%,
    var(--panel-2) 100%);
}

.footer-grid {
  max-width: var(--width-page);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem 3rem;
}

.footer-brand {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.brand-mark-sm {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--ink);
  position: relative;
}

.brand-mark-sm::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1.5px;
  background: var(--cite-instr);
}

.dim {
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.footer-nav a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
  text-decoration: none;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  transition: color 150ms ease;
}

.footer-nav a:hover {
  color: var(--ink-2);
}

.attribution {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--dim);
  margin: 0;
  width: 100%;
  text-align: right;
}

.attribution a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--cite-instr);
  padding-bottom: 1px;
  transition: border-color 200ms ease;
}

.attribution a:hover {
  border-bottom-color: var(--cite-infer);
}

/* ---------- Responsive ---------- */

@media (max-width: 880px) {
  html { font-size: 17px; }

  .hero {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }

  .how-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .how-panel {
    min-height: 0;
  }

  .diff-item {
    padding-left: 3.2rem;
  }
}

@media (max-width: 600px) {
  :root { --gutter: 1.25rem; }

  html { font-size: 16px; }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    padding-top: 1.2rem;
    padding-bottom: 1.2rem;
  }

  .primary-nav {
    gap: 1rem;
    flex-wrap: wrap;
  }

  .hero-pitch {
    line-height: 1.28;
  }

  .footer-grid {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .attribution {
    text-align: left;
  }

  /* Mobile tooltip: anchor centered & wrap */
  .cite::after {
    max-width: 80vw;
    white-space: normal;
    left: 0;
    right: auto;
  }
}

/* ---------- Print friendliness (someone might want to print as a brief) ---------- */

@media print {
  body { background: white; }
  .site-header, .site-footer, .hero-cta, .live-indicator, .legend { display: none; }
  .cite { border-bottom: none; }
  .cite::after, .cite::before { display: none; }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0ms !important;
    transition-duration: 0ms !important;
  }
}

/* ============================================================
   ----------  SUB-PAGE STYLES  ----------
   Shared across non-landing pages: limitations, docs, log.
   Designed to inherit the landing page's typography + palette
   while giving sub-pages a slightly different rhythm
   (smaller hero, scannable content blocks).
   ============================================================ */

/* ---------- Page hero (smaller than landing hero) ---------- */

.page-hero {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
  max-width: var(--width-text);
}

.page-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
  text-transform: lowercase;
  letter-spacing: 0.04em;
  margin: 0 0 1.6rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 0.9rem;
}

.back-link a {
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 150ms ease, border-color 150ms ease;
  padding-bottom: 1px;
}

.back-link a:hover {
  color: var(--cite-instr);
  border-bottom-color: var(--cite-instr);
}

.meta-tag {
  color: var(--ink-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.page-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.012em;
  margin: 0 0 1.2rem;
  color: var(--ink-2);
}

.page-title .dash {
  color: var(--dim);
  font-weight: 400;
  margin: 0 0.15em;
}

.page-lede {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 2rem;
  max-width: 60ch;
}

/* ---------- Tag legend (dl-based; one dt+dd per row) ---------- */

.tag-legend {
  margin: 1.5rem 0 0;
  padding: 1.1rem 1.3rem;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--cite-domain);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tag-legend-row {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
}

.tag-legend dt {
  margin: 0;
  flex: 0 0 auto;
}

.tag-legend dd {
  margin: 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--dim);
  line-height: 1.5;
}

/* ---------- The tag itself ---------- */

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: lowercase;
  letter-spacing: 0.04em;
  padding: 0.18rem 0.55rem;
  border: 1px solid;
  border-radius: 2px;
  white-space: nowrap;
  vertical-align: middle;
  line-height: 1.4;
}

/* User-facing tag system on /limitations/ */

.tag-hard {
  /* hard limit — physical/API constraint, can't bypass */
  color: var(--cite-disagree);
  border-color: color-mix(in srgb, var(--cite-disagree) 50%, transparent);
  background: color-mix(in srgb, var(--cite-disagree) 7%, transparent);
}

.tag-required {
  /* required — something user must provide */
  color: var(--cite-instr);
  border-color: color-mix(in srgb, var(--cite-instr) 50%, transparent);
  background: color-mix(in srgb, var(--cite-instr) 7%, transparent);
}

.tag-rec {
  /* recommendation — best practice */
  color: #8a6800; /* darker than var(--cite-domain) for legibility */
  border-color: color-mix(in srgb, var(--cite-domain) 55%, transparent);
  background: color-mix(in srgb, var(--cite-domain) 10%, transparent);
}

.tag-watch {
  /* watch for — known extraction failure mode */
  color: var(--cite-infer);
  border-color: color-mix(in srgb, var(--cite-infer) 50%, transparent);
  background: color-mix(in srgb, var(--cite-infer) 7%, transparent);
}

/* Architectural tag system — kept for the engineering log post draft.
   Same color assignments, different labels. */

.tag-bug      { color: var(--cite-disagree);
                border-color: color-mix(in srgb, var(--cite-disagree) 50%, transparent);
                background: color-mix(in srgb, var(--cite-disagree) 7%, transparent); }
.tag-intent   { color: var(--cite-infer);
                border-color: color-mix(in srgb, var(--cite-infer) 50%, transparent);
                background: color-mix(in srgb, var(--cite-infer) 7%, transparent); }
.tag-capacity { color: #8a6800;
                border-color: color-mix(in srgb, var(--cite-domain) 55%, transparent);
                background: color-mix(in srgb, var(--cite-domain) 10%, transparent); }
.tag-infra    { color: var(--cite-instr);
                border-color: color-mix(in srgb, var(--cite-instr) 50%, transparent);
                background: color-mix(in srgb, var(--cite-instr) 7%, transparent); }

/* ---------- Sub-page section spacing override ---------- */

.limit-class {
  padding-top: 3.5rem;
  padding-bottom: 1.5rem;
  max-width: var(--width-text);
}

.class-lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--dim);
  margin: -1.5rem 0 2rem; /* tightens up under the section label */
  max-width: 58ch;
}

/* ---------- Limit card ---------- */

.limit {
  padding: 1.4rem 1.6rem;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--rule);
  margin: 0 0 1rem;
  transition: border-left-color 200ms ease, transform 200ms ease;
}

.limit:hover {
  transform: translateX(2px);
}

/* Color the left edge based on the contained tag — uses :has() which
   works in all evergreen browsers. Graceful: falls back to neutral
   when :has() isn't supported. */
.limit:has(.tag-hard)     { border-left-color: var(--cite-disagree); }
.limit:has(.tag-required) { border-left-color: var(--cite-instr); }
.limit:has(.tag-rec)      { border-left-color: var(--cite-domain); }
.limit:has(.tag-watch)    { border-left-color: var(--cite-infer); }
.limit:has(.tag-bug)      { border-left-color: var(--cite-disagree); }
.limit:has(.tag-intent)   { border-left-color: var(--cite-infer); }
.limit:has(.tag-capacity) { border-left-color: var(--cite-domain); }
.limit:has(.tag-infra)    { border-left-color: var(--cite-instr); }

.limit-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin: 0 0 0.7rem;
}

.limit-header h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.3;
  letter-spacing: -0.005em;
  margin: 0;
  color: var(--ink-2);
  flex: 1 1 auto;
}

.limit p {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0;
}

.limit p code {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  background: color-mix(in srgb, var(--ink) 5%, transparent);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
  color: var(--ink-2);
}

.limit p em {
  font-style: italic;
  color: var(--ink-2);
}

/* ---------- Active-page indicator in nav ---------- */

.primary-nav a[aria-current="page"] {
  color: var(--ink);
  position: relative;
}

.primary-nav a[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1.5px;
  background: var(--cite-instr);
}

/* ---------- Page closer (small pointer block at the bottom) ---------- */

.page-closer {
  padding-top: 2.5rem;
  padding-bottom: 4rem;
  max-width: var(--width-text);
}

.closer-lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--dim);
  margin: 0;
}

.closer-lede a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--cite-instr);
  padding-bottom: 1px;
  transition: border-color 200ms ease;
}

.closer-lede a:hover {
  border-bottom-color: var(--cite-infer);
}

/* ---------- Sub-page responsive overrides ---------- */

@media (max-width: 880px) {
  .page-hero {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }

  .limit-class {
    padding-top: 2.5rem;
  }

  .tag-legend {
    padding: 1rem;
  }
}

@media (max-width: 600px) {
  .limit-header {
    flex-direction: column;
    gap: 0.5rem;
  }

  .tag-legend-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }
}

/* ============================================================
   ----------  DOCS PAGE STYLES  ----------
   Section structure echoes limit-class but supports code blocks,
   numbered step lists, callouts, and a field-reference dl.
   ============================================================ */

/* On-this-page TOC at top of the docs hero */

.page-toc {
  margin: 2rem 0 0;
  padding: 1.1rem 1.3rem;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--cite-instr);
  max-width: 520px;
}

.toc-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--dim);
  margin: 0 0 0.7rem;
}

.page-toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-toc a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  padding-bottom: 1px;
  transition: color 150ms ease, border-color 150ms ease;
}

.page-toc a:hover {
  color: var(--cite-instr);
  border-bottom-color: var(--cite-instr);
}

/* Docs section width — slightly wider than limit-class to fit code blocks */

.docs-class {
  padding-top: 3.5rem;
  padding-bottom: 2.5rem;
  max-width: var(--width-text);
  scroll-margin-top: 1rem; /* anchor offset */
}

/* H3 within docs sections */

.docs-h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -0.005em;
  color: var(--ink-2);
  margin: 2.2rem 0 0.9rem;
}

.docs-h3:first-of-type {
  margin-top: 1.4rem;
}

/* Body text in docs */

.docs-para {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  margin: 0 0 1rem;
}

.docs-aside {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--dim);
  margin: -0.4rem 0 1.5rem; /* tightens up under code blocks */
  max-width: 60ch;
}

.docs-aside em {
  color: var(--ink-2);
}

.docs-pointer {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--dim);
  margin: 2rem 0 0;
  padding: 0.9rem 1.1rem;
  background: color-mix(in srgb, var(--cite-domain) 6%, var(--bg));
  border-left: 2px solid color-mix(in srgb, var(--cite-domain) 60%, transparent);
}

.docs-pointer a {
  color: var(--ink-2);
  border-bottom: 1px solid var(--cite-instr);
  text-decoration: none;
  padding-bottom: 1px;
}

/* Numbered step list (quickstart) */

.step-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.step-list li {
  counter-increment: step;
  margin: 0 0 1.4rem;
  padding-left: 3rem;
  position: relative;
}

.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--cite-instr);
  border: 1.5px solid color-mix(in srgb, var(--cite-instr) 50%, transparent);
  border-radius: 50%;
  background: var(--panel);
}

.step-list p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  line-height: 1.55;
  padding-top: 0.2rem; /* aligns with circle center */
  color: var(--ink);
}

.step-list strong {
  color: var(--ink-2);
}

/* Plain content lists in docs */

.docs-list {
  margin: 0 0 1.5rem;
  padding-left: 1.2rem;
}

.docs-list li {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 0.6rem;
}

.docs-list-spaced li {
  margin: 0 0 1rem;
}

.docs-list strong {
  color: var(--ink-2);
  font-weight: 600;
}

.docs-list code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
  color: var(--ink-2);
}

.docs-list em {
  font-style: italic;
  color: var(--ink-2);
}

/* Code blocks (multi-line) */

.code-block {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.55;
  color: var(--ink-2);
  background: var(--panel-2);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--cite-instr);
  padding: 1rem 1.2rem;
  margin: 1.2rem 0 1.6rem;
  overflow-x: auto;
  white-space: pre;
}

.code-block code {
  font-family: inherit;
  font-size: inherit;
  background: none;
  padding: 0;
  color: inherit;
}

/* Field reference dl/dt/dd */

.field-ref {
  margin: 0 0 1.5rem;
  padding: 1rem 1.2rem;
  background: var(--panel);
  border: 1px solid var(--grid);
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.field-ref dt {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-2);
  margin: 0;
}

.field-ref dt code {
  background: none;
  padding: 0;
  color: inherit;
  font-weight: 500;
}

.field-ref dd {
  font-family: var(--font-serif);
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--ink);
  margin: 0.15rem 0 0 1.2rem;
}

.field-ref dd code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  padding: 0.08rem 0.3rem;
  border-radius: 2px;
  color: var(--ink-2);
}

/* Callouts (info / tip / warn) */

.callout {
  margin: 1.5rem 0;
  padding: 0.95rem 1.2rem;
  border: 1px solid var(--grid);
  background: var(--panel);
  border-left-width: 3px;
}

.callout p {
  font-family: var(--font-serif);
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--ink);
  margin: 0;
}

.callout p strong {
  color: var(--ink-2);
}

.callout p code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  padding: 0.08rem 0.3rem;
  border-radius: 2px;
  color: var(--ink-2);
}

.callout-info {
  border-left-color: var(--cite-instr);
  background: color-mix(in srgb, var(--cite-instr) 4%, var(--panel));
}

.callout-tip {
  border-left-color: var(--cite-domain);
  background: color-mix(in srgb, var(--cite-domain) 5%, var(--panel));
}

.callout-warn {
  border-left-color: var(--cite-infer);
  background: color-mix(in srgb, var(--cite-infer) 5%, var(--panel));
}

/* Docs-page responsive overrides */

@media (max-width: 880px) {
  .docs-class {
    padding-top: 2.5rem;
  }

  .code-block {
    font-size: 0.78rem;
    padding: 0.8rem 0.9rem;
  }
}

@media (max-width: 600px) {
  .step-list li {
    padding-left: 2.5rem;
  }

  .step-list li::before {
    width: 1.6rem;
    height: 1.6rem;
    font-size: 0.78rem;
  }

  .field-ref {
    padding: 0.8rem 0.9rem;
  }

  .field-ref dd {
    margin-left: 0;
  }
}

/* ============================================================
   ----------  ENGINEERING LOG STYLES  ----------
   Index page (list of posts) + individual post page styles.
   ============================================================ */

/* Post list on /log/ index */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.post-item {
  padding: 1.4rem 1.6rem;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--cite-instr);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.post-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -16px rgba(7, 54, 66, 0.2);
}

.post-header {
  margin: 0 0 0.7rem;
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--dim);
  text-transform: lowercase;
  letter-spacing: 0.04em;
  margin: 0 0 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.8rem;
  align-items: center;
}

.post-meta time {
  color: var(--ink-2);
  font-weight: 500;
}

.post-meta .post-num {
  color: var(--cite-instr);
}

.post-meta .post-reading {
  color: var(--dim);
  font-style: italic;
}

.post-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.3;
  letter-spacing: -0.008em;
  margin: 0;
}

.post-title a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 150ms ease, color 150ms ease;
}

.post-title a:hover {
  color: var(--cite-instr);
  border-bottom-color: var(--cite-instr);
}

.post-excerpt {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  margin: 0;
}

.post-excerpt em {
  color: var(--ink-2);
}

/* Individual post page */

.post-hero {
  padding-top: 3rem;
  padding-bottom: 3rem;
  max-width: var(--width-text);
}

.post-title-page {
  /* Slightly tighter than .page-title for the larger post title */
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  margin-bottom: 1.6rem;
}

/* The "What fixing this looks like" note inside each limit card */

.limit-fix {
  margin: 0.9rem 0 0;
  padding: 0.7rem 0.9rem;
  background: color-mix(in srgb, var(--cite-instr) 5%, transparent);
  border-left: 2px solid color-mix(in srgb, var(--cite-instr) 50%, transparent);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--ink);
}

.limit-fix strong {
  color: var(--ink-2);
  font-style: normal;
  font-weight: 600;
}

.limit-fix code {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  padding: 0.08rem 0.3rem;
  border-radius: 2px;
  color: var(--ink-2);
}