/* ============================================================
   SciPIvot landing — "laboratory notebook x scientific journal"
   Palette validated for CVD safety: mark navy #1A5DA0, amber #A67C13
   on warm paper #FAF6EF (see docs/assets/ — validator: ALL PASS).
   ============================================================ */
:root {
  --paper: #faf6ef;
  --paper-deep: #f2ebdf;
  --card: #fffdf9;
  --ink: #004488;            /* headings / brand navy (paper figure navy) */
  --ink-deep: #002a55;
  --text: #22303f;
  --text-soft: #5c6b7d;
  --hairline: rgba(0, 68, 136, .16);
  --hairline-soft: rgba(0, 68, 136, .09);
  --navy-mark: #1a5da0;      /* validated chart navy */
  --amber: #a67c13;          /* validated chart amber */
  --amber-tint: #fbf3dc;     /* paper: original LLM plan */
  --navy-tint: #e1e8f1;      /* paper: human-corrected plan */
  --shadow: 0 18px 40px -18px rgba(26, 42, 64, .28);
  --radius: 14px;
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", sans-serif;
  --font-mono: "IBM Plex Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 90% 60% at 85% -10%, rgba(166, 124, 19, .07), transparent 60%),
    radial-gradient(ellipse 70% 50% at -10% 30%, rgba(26, 93, 160, .05), transparent 55%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.icon-defs { position: absolute; width: 0; height: 0; }
.icon { width: 1.05em; height: 1.05em; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; vertical-align: -0.15em; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: .6em 1em; z-index: 99; }
.skip-link:focus { left: 8px; }
.container { width: min(1120px, 92vw); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--font-display); color: var(--ink); line-height: 1.08; margin: 0 0 .5em; font-weight: 560; letter-spacing: -.012em; }
h1 { font-size: clamp(2.7rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); }
h3 { font-size: 1.28rem; line-height: 1.25; }
h1 em, h2 em, h3 em { font-style: italic; color: var(--amber); font-weight: 520; }
.eyebrow {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .16em;
  color: var(--amber); margin: 0 0 .9em; font-weight: 500;
}
.eyebrow.light { color: #e8c877; }
.section-lede { font-size: 1.06rem; color: var(--text-soft); max-width: 46em; margin: 0; }
.section { padding: 5.5rem 0; }
.section-heading { margin-bottom: 2.8rem; }
.section-heading.centered { text-align: center; }
.section-heading.centered .section-lede { margin-inline: auto; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline-soft);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: .85rem 0; }
.brand { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none; font-family: var(--font-display); font-size: 1.25rem; color: var(--ink); font-weight: 600; }
.brand b { font-weight: 600; color: var(--amber); }
.site-header nav { display: flex; gap: 1.6rem; align-items: center; }
.site-header nav a { text-decoration: none; font-size: .88rem; color: var(--text-soft); transition: color .2s; }
.site-header nav a:hover { color: var(--ink); }
.nav-github { display: inline-flex; gap: .4rem; align-items: center; border: 1px solid var(--hairline); padding: .42rem .95rem; border-radius: 999px; color: var(--ink) !important; }
.nav-github:hover { background: var(--ink); color: #fff !important; }
.menu-toggle { display: none; background: none; border: 0; padding: .5rem; cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; transition: .25s; }

/* ---------- buttons ---------- */
.button {
  display: inline-flex; align-items: center; gap: .55rem; text-decoration: none;
  padding: .82rem 1.5rem; border-radius: 999px; font-size: .95rem; font-weight: 500;
  border: 1px solid transparent; cursor: pointer; font-family: var(--font-body);
  transition: transform .18s ease, box-shadow .18s ease, background .18s;
}
.button-primary { background: var(--ink); color: #fff; box-shadow: 0 10px 24px -12px rgba(0, 68, 136, .55); }
.button-primary:hover { transform: translateY(-2px); background: var(--ink-deep); }
.button-outline { border-color: var(--hairline); color: var(--ink); background: transparent; }
.button-outline:hover { border-color: var(--ink); transform: translateY(-2px); }
.text-button { background: none; border: 0; color: var(--text-soft); cursor: pointer; font-size: .9rem; padding: .5rem; }
.text-button:hover { color: var(--ink); }
.text-link { display: inline-flex; align-items: center; gap: .45rem; color: var(--ink); text-decoration: none; font-weight: 500; border-bottom: 1.5px solid transparent; }
.text-link:hover { border-bottom-color: var(--amber); }

/* ---------- hero ---------- */
.hero { padding: 4.5rem 0 3.5rem; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 3.5rem; align-items: center; }
.hero-lede { font-size: 1.13rem; color: var(--text-soft); max-width: 34em; }
.hero-lede strong { color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin: 1.8rem 0 1.2rem; }
.hero-status { font-family: var(--font-mono); font-size: .74rem; letter-spacing: .05em; color: var(--text-soft); }
.hero-status span { margin: 0 .5em; color: var(--amber); }
.hero-status a { color: inherit; text-underline-offset: .2em; }

.plan-duel {
  background: var(--card); border: 1px solid var(--hairline-soft); border-radius: 20px;
  padding: 1.6rem; box-shadow: var(--shadow); position: relative;
}
.duel-caption { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .14em; color: var(--text-soft); margin: 0 0 1.1rem; }
.plan-card { border-radius: var(--radius); padding: 1.05rem 1.15rem; border: 1px solid transparent; }
.plan-card header { display: flex; justify-content: space-between; align-items: center; margin-bottom: .55rem; }
.plan-tag { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .11em; text-transform: uppercase; }
.plan-card p { margin: .35rem 0; font-size: .88rem; line-height: 1.55; }
.plan-goal span { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .12em; text-transform: uppercase; opacity: .7; margin-right: .5em; }
.plan-rejected { background: var(--amber-tint); border-color: rgba(166, 124, 19, .35); }
.plan-rejected .plan-tag, .plan-rejected .verdict { color: var(--amber); }
.plan-reference { background: var(--navy-tint); border-color: rgba(26, 93, 160, .35); }
.plan-reference .plan-tag, .plan-reference .verdict { color: var(--navy-mark); }
.verdict { font-size: 1.15rem; font-weight: 600; }
.duel-vs { display: flex; justify-content: center; margin: .65rem 0; }
.duel-vs span {
  font-family: var(--font-display); font-style: italic; font-size: 1.02rem; color: var(--text-soft);
  background: var(--card); border: 1px solid var(--hairline-soft); border-radius: 999px; padding: .18rem .95rem;
}
.duel-note { font-size: .78rem; color: var(--text-soft); margin: 1rem 0 0; border-top: 1px solid var(--hairline-soft); padding-top: .85rem; }

.hero-stats {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px;
  background: var(--hairline-soft); border: 1px solid var(--hairline-soft); border-radius: var(--radius);
  margin-top: 3.8rem; overflow: hidden;
}
.stat { background: var(--paper); padding: 1.35rem 1.2rem 1.25rem; }
.stat strong { display: block; font-family: var(--font-display); font-size: clamp(1.7rem, 3vw, 2.35rem); color: var(--ink); font-weight: 560; line-height: 1; }
.stat strong small { font-size: .6em; color: var(--amber); }
.stat span { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .07em; color: var(--text-soft); text-transform: uppercase; }

/* ---------- finding (dark band) ---------- */
.finding-section {
  background: linear-gradient(168deg, #0b2c52 0%, var(--ink-deep) 58%, #0e3562 100%);
  color: #d9e4f2; padding: 5.5rem 0;
}
.finding-section h2 { color: #fff; }
.finding-section h2 em { color: #e8c877; }
.finding-section .section-lede { color: #b7c7dc; }
.finding-section .section-lede strong { color: #fff; }
.finding-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem; margin-top: 3rem; }
.finding-card {
  background: rgba(255, 255, 255, .055); border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius); padding: 1.8rem;
}
.finding-kicker { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .15em; color: #e8c877; margin: 0 0 .8rem; }
.finding-card h3 { color: #fff; font-size: 1.35rem; }
.finding-card h3 em { color: #e8c877; }
.finding-card > p { color: #b7c7dc; font-size: .95rem; }
.chart-note { font-family: var(--font-mono); font-size: .68rem; color: #8fa5c0 !important; letter-spacing: .03em; margin-top: 1.1rem !important; }

/* delta chart (single-hue magnitude bars; values direct-labeled) */
.delta-chart { margin-top: 1.4rem; display: grid; gap: .62rem; }
.delta-row { display: grid; grid-template-columns: 4.2rem 1fr 5rem; align-items: center; gap: .8rem; }
.delta-name { font-family: var(--font-mono); font-size: .74rem; color: #c9d7ea; }
.delta-track { height: 12px; background: rgba(255, 255, 255, .1); border-radius: 3px; position: relative; overflow: hidden; }
.delta-bar {
  position: absolute; right: 0; top: 0; bottom: 0; width: var(--w);
  background: #e8c877; border-radius: 3px 0 0 3px;
}
.delta-val { font-family: var(--font-mono); font-size: .78rem; color: #fff; text-align: right; }

/* repair viz (two-state, direct labels) */
.repair-viz { margin-top: 1.4rem; display: grid; gap: 1.15rem; }
.repair-label { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; color: #c9d7ea; margin: 0 0 .5rem; text-transform: uppercase; }
.repair-bars { display: grid; gap: .55rem; }
.repair-bar { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: .8rem; }
.repair-fill { height: 11px; width: var(--w); border-radius: 3px; display: block; }
.repair-good .repair-fill { background: #8fc98a; }
.repair-bad .repair-fill { background: #e8c877; }
.repair-num { font-family: var(--font-mono); font-size: .78rem; color: #fff; white-space: nowrap; }

/* ---------- cases ---------- */
.case-tabs { display: flex; gap: .6rem; flex-wrap: wrap; justify-content: center; margin-bottom: 1.8rem; }
.case-tabs button {
  font-family: var(--font-body); font-size: .88rem; color: var(--text-soft); cursor: pointer;
  background: transparent; border: 1px solid var(--hairline-soft); border-radius: 999px; padding: .62rem 1.15rem;
  display: inline-flex; align-items: center; gap: .6rem; transition: .2s;
}
.case-tabs button span { font-family: var(--font-mono); font-size: .68rem; color: var(--amber); }
.case-tabs button:hover { border-color: var(--ink); color: var(--ink); }
.case-tabs button[aria-selected="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.case-tabs button[aria-selected="true"] span { color: #e8c877; }

.example-panel {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 2.2rem;
  background: var(--card); border: 1px solid var(--hairline-soft); border-radius: 20px;
  padding: 2.2rem; box-shadow: var(--shadow);
}
.case-context-top { display: flex; gap: 1rem; align-items: center; margin-bottom: .9rem; }
.domain-tag {
  font-family: var(--font-mono); font-size: .66rem; letter-spacing: .12em;
  background: var(--navy-tint); color: var(--ink); padding: .32rem .75rem; border-radius: 999px;
}
.example-label { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .12em; color: var(--text-soft); }
.case-context h3 { margin-bottom: .65rem; }
.case-context > p { color: var(--text-soft); font-size: .94rem; }
.evidence-window {
  border: 1px solid var(--hairline-soft); border-radius: 12px; padding: 1rem 1.15rem;
  background: color-mix(in srgb, var(--paper) 65%, var(--card)); margin: 1.2rem 0;
}
.evidence-title { display: flex; gap: .55rem; align-items: center; font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; color: var(--ink); margin-bottom: .75rem; }
.evidence-window dl { margin: 0; display: grid; gap: .55rem; }
.evidence-window dl div { display: grid; grid-template-columns: 8.5rem 1fr; gap: .8rem; font-size: .86rem; }
.evidence-window dt { font-family: var(--font-mono); font-size: .72rem; color: var(--amber); text-transform: uppercase; letter-spacing: .06em; padding-top: .12em; }
.evidence-window dd { margin: 0; color: var(--text); }
.case-schematic { border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline-soft); }
.snapshot-note { font-family: var(--font-mono); font-size: .68rem; color: var(--text-soft); letter-spacing: .03em; margin-top: .9rem; }

.decision-heading { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 1.1rem; }
.decision-heading h4 { margin: 0; font-family: var(--font-display); font-size: 1.22rem; color: var(--ink); font-weight: 560; }
.decision-heading span { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .13em; color: var(--text-soft); }
.answer-options { display: grid; gap: .85rem; }
.answer {
  display: grid; grid-template-columns: 2.35rem 1fr 1.25rem; gap: .95rem; align-items: start;
  text-align: left; padding: 1.05rem 1.15rem; border-radius: var(--radius); cursor: pointer;
  border: 1.5px solid var(--hairline-soft); background: var(--paper); font-family: var(--font-body);
  transition: border-color .18s, transform .18s, box-shadow .18s;
}
.answer:hover { border-color: var(--ink); transform: translateY(-2px); box-shadow: var(--shadow); }
.answer[aria-pressed="true"] { border-color: var(--ink); box-shadow: var(--shadow); }
.answer-letter {
  font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; color: var(--ink);
  border: 1.5px solid var(--hairline); border-radius: 10px; width: 2.35rem; height: 2.35rem;
  display: grid; place-items: center;
}
.answer-body { display: grid; gap: .28rem; }
.answer-body strong { color: var(--ink); font-size: .98rem; }
.answer-body span { color: var(--text-soft); font-size: .87rem; line-height: 1.55; }
.answer-radio { width: 1.15rem; height: 1.15rem; border-radius: 50%; border: 1.5px solid var(--hairline); margin-top: .35rem; }
.answer[aria-pressed="true"] .answer-radio { border: .38rem solid var(--ink); }
.answer.is-correct { border-color: var(--navy-mark); background: var(--navy-tint); }
.answer.is-wrong { border-color: var(--amber); background: var(--amber-tint); }
.answer-result {
  margin-top: 1.15rem; padding: 1.15rem 1.25rem; border-radius: var(--radius); font-size: .92rem;
  border: 1.5px solid var(--navy-mark); background: var(--navy-tint); color: var(--ink-deep);
}
.answer-result.wrong { border-color: var(--amber); background: var(--amber-tint); color: #6b4e08; }
.answer-result strong { display: block; margin-bottom: .35rem; }
.case-controls { display: flex; align-items: center; gap: 1rem; margin-top: 1.35rem; }
.example-feedback { font-family: var(--font-mono); font-size: .72rem; color: var(--text-soft); min-height: 1.2em; margin: .9rem 0 0; }

/* ---------- results ---------- */
.results-section {
  background: var(--paper-deep);
  border-top: 1px solid var(--hairline-soft); border-bottom: 1px solid var(--hairline-soft);
  padding: 5.5rem 0;
}
.results-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: end; }
.result-panel {
  background: var(--card); border: 1px solid var(--hairline-soft); border-radius: 20px;
  padding: 1.8rem 2rem 1.5rem; box-shadow: var(--shadow);
}
.result-toolbar { display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.segmented { display: inline-flex; background: var(--paper-deep); border-radius: 999px; padding: .28rem; gap: .25rem; }
.segmented button, .effort-picker button {
  border: 0; background: transparent; cursor: pointer; font-family: var(--font-body); font-size: .84rem;
  padding: .52rem 1.15rem; border-radius: 999px; color: var(--text-soft); transition: .18s;
}
.segmented button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.effort-picker { display: inline-flex; align-items: center; gap: .35rem; }
.effort-label { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em; color: var(--text-soft); margin-right: .5rem; text-transform: uppercase; }
.effort-picker button { font-family: var(--font-mono); font-size: .78rem; padding: .45rem .85rem; border: 1px solid var(--hairline-soft); }
.effort-picker button[aria-pressed="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }

.results-table { width: 100%; border-collapse: collapse; }
.results-table th, .results-table td { text-align: left; padding: .78rem .65rem; border-bottom: 1px solid var(--hairline-soft); font-size: .92rem; }
.results-table thead th {
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .11em; text-transform: uppercase;
  color: var(--text-soft); font-weight: 500; border-bottom: 1px solid var(--hairline);
}
.results-table tbody th, .results-table tfoot th { font-weight: 500; color: var(--ink); white-space: nowrap; }
.model-symbol {
  display: inline-grid; place-items: center; width: 1.75rem; height: 1.75rem; border-radius: 7px;
  background: var(--navy-tint); color: var(--ink); font-family: var(--font-mono); font-size: .78rem;
  margin-right: .65rem; font-weight: 500;
}
.model-symbol.human { background: var(--ink); color: #e8c877; }
.meter { position: relative; height: 14px; background: var(--paper-deep); border-radius: 4px; overflow: visible; min-width: 220px; }
.meter-fill {
  position: absolute; left: 0; top: 0; bottom: 0; width: var(--w); background: var(--navy-mark);
  border-radius: 4px 2px 2px 4px; transition: width .5s cubic-bezier(.2, .7, .2, 1);
}
.human-fill { background: var(--ink-deep); }
.chance {
  position: absolute; top: -4px; bottom: -4px; width: 0;
  border-left: 1.5px dashed rgba(0, 68, 136, .55); z-index: 2;
}
.human-mark { position: absolute; top: -7px; font-size: .85rem; color: var(--ink); transform: translateX(-50%); z-index: 3; }
.score-cell { font-family: var(--font-mono); font-size: 1.02rem !important; color: var(--ink); font-weight: 500; }
.best-cell { font-family: var(--font-mono); font-size: .78rem !important; color: var(--text-soft); }
.human-row th, .human-row td { border-top: 1px solid var(--hairline); border-bottom: 0; padding-top: 1rem; }
.result-bottom { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; margin-top: 1.15rem; padding-top: 1.1rem; border-top: 1px solid var(--hairline-soft); }
#result-summary { font-family: var(--font-mono); font-size: .78rem; color: var(--text-soft); margin: 0; }
.result-notes p { font-size: .82rem; color: var(--text-soft); max-width: 62em; margin: 1.3rem 0 0; }

/* ---------- protocol ---------- */
.protocol-section { padding: 5.5rem 0; }
.pipeline { list-style: none; margin: 0 0 3rem; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.6rem; counter-reset: step; }
.pipeline li { border-top: 2px solid var(--hairline); padding-top: 1.25rem; position: relative; }
.step-number {
  font-family: var(--font-display); font-style: italic; font-size: 1.55rem; color: var(--amber);
  display: block; margin-bottom: .55rem;
}
.pipeline h3 { font-size: 1.12rem; margin-bottom: .4rem; }
.pipeline p { font-size: .88rem; color: var(--text-soft); margin: 0; }
.boundary-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem; }
.boundary { border-radius: var(--radius); padding: 1.7rem 1.9rem; border: 1.5px solid; }
.boundary.can-see { background: var(--navy-tint); border-color: rgba(26, 93, 160, .35); }
.boundary.held-back { background: var(--amber-tint); border-color: rgba(166, 124, 19, .3); }
.boundary-label { display: inline-flex; align-items: center; gap: .55rem; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .13em; margin: 0 0 .85rem; }
.boundary.can-see .boundary-label { color: var(--navy-mark); }
.boundary.held-back .boundary-label { color: var(--amber); }
.boundary h3 { margin-bottom: .45rem; }
.boundary p { margin: 0; font-size: .92rem; color: var(--text-soft); }

/* ---------- use ---------- */
.use-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; margin-bottom: 2.4rem; }
.use-card {
  background: var(--card); border: 1px solid var(--hairline-soft); border-radius: var(--radius);
  padding: 1.75rem; transition: transform .2s, box-shadow .2s;
}
.use-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.use-icon { width: 2.6rem; height: 2.6rem; border-radius: 10px; background: var(--navy-tint); color: var(--ink); display: grid; place-items: center; margin: 0 0 1rem; }
.use-icon .icon { width: 1.25rem; height: 1.25rem; }
.use-card h3 { font-size: 1.15rem; }
.use-card p { color: var(--text-soft); font-size: .92rem; }
.snippet-wrap { border-radius: var(--radius); overflow: hidden; border: 1px solid rgba(255, 255, 255, .1); background: #0b2c52; }
.snippet-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: .8rem 1.25rem; background: rgba(255, 255, 255, .06);
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .14em; color: #9db4d1;
}
.copy-btn {
  display: inline-flex; align-items: center; gap: .45rem; background: rgba(255, 255, 255, .1);
  border: 0; color: #d9e4f2; font-family: var(--font-mono); font-size: .72rem;
  padding: .38rem .85rem; border-radius: 999px; cursor: pointer; transition: .18s;
}
.copy-btn:hover { background: rgba(255, 255, 255, .22); }
.snippet-wrap pre { margin: 0; padding: 1.45rem 1.55rem; overflow-x: auto; }
.snippet-wrap code { font-family: var(--font-mono); font-size: .82rem; line-height: 1.75; color: #d9e4f2; }
.snippet-wrap code .cm { color: #7f96b3; }

/* ---------- faq ---------- */
.faq-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 3rem; align-items: start; }
.faq-list { display: grid; gap: .7rem; }
.faq-list details {
  border: 1px solid var(--hairline-soft); border-radius: 12px; background: var(--card);
  padding: 1.15rem 1.35rem;
}
.faq-list summary {
  cursor: pointer; font-weight: 500; color: var(--ink); list-style: none;
  display: flex; justify-content: space-between; gap: 1rem; font-size: 1.02rem;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--amber); font-family: var(--font-mono); transition: transform .2s; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { margin: .75rem 0 0; color: var(--text-soft); font-size: .93rem; }

/* ---------- cite (dark) ---------- */
.cite-section {
  background: linear-gradient(168deg, #0b2c52, var(--ink-deep));
  color: #d9e4f2; padding: 5rem 0;
}
.cite-section h2 { color: #fff; }
.cite-section .section-lede { color: #b7c7dc; }
.cite-inner { display: grid; grid-template-columns: 1fr 1.15fr; gap: 3rem; align-items: center; }
.cite-box { border-radius: var(--radius); overflow: hidden; border: 1px solid rgba(255, 255, 255, .14); background: rgba(0, 0, 0, .22); }
.cite-box pre { margin: 0; padding: 1.35rem 1.55rem; overflow-x: auto; }
.cite-box code { font-family: var(--font-mono); font-size: .76rem; line-height: 1.65; color: #d9e4f2; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--hairline-soft); padding: 3rem 0 2rem; }
.footer-main { display: flex; justify-content: space-between; gap: 2.5rem; flex-wrap: wrap; }
.footer-main p { color: var(--text-soft); font-size: .88rem; margin: .85rem 0 0; }
.footer-main nav { display: grid; gap: .55rem; align-content: start; }
.footer-main nav a { color: var(--text-soft); text-decoration: none; font-size: .9rem; }
.footer-main nav a:hover { color: var(--ink); }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap;
  margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--hairline-soft);
  font-family: var(--font-mono); font-size: .72rem; color: var(--text-soft);
}
.footer-bottom a { color: var(--ink); text-decoration: none; }

/* ---------- reveal motion ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .1s; }
.reveal.d2 { transition-delay: .2s; }
.reveal.d3 { transition-delay: .3s; }
.reveal.d4 { transition-delay: .4s; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .button:hover, .answer:hover, .use-card:hover { transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero-grid, .finding-grid, .example-panel, .results-heading,
  .boundary-panel, .cite-inner, .faq-section { grid-template-columns: 1fr; }
  .pipeline { grid-template-columns: 1fr 1fr; }
  .use-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .menu-toggle { display: block; }
  .site-header nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 1.1rem;
    background: var(--paper); padding: 1.4rem 4vw 1.8rem; border-bottom: 1px solid var(--hairline);
  }
  .site-header nav.open { display: flex; }
  .hero { padding-top: 2.5rem; }
}
@media (max-width: 560px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .pipeline { grid-template-columns: 1fr; }
  .result-panel { padding: 1.25rem; }
  .example-panel { padding: 1.35rem; }
  .delta-row { grid-template-columns: 3.4rem 1fr 4.4rem; gap: .55rem; }
}