:root {
  --ink: #102a31;
  --ink-deep: #071b21;
  --paper: #f3f0e7;
  --paper-light: #fbfaf5;
  --line: #d7d2c4;
  --muted: #607177;
  --teal: #2e716d;
  --teal-light: #d6e9e4;
  --gold: #c8953f;
  --gold-light: #f1e2bf;
  --coral: #bd664d;
  --white: #fff;
  --shadow: 0 24px 70px rgba(7, 27, 33, .12);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper-light);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: inherit; }
button, input { font: inherit; }
button { color: inherit; }
.wrap { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.narrow { width: min(920px, calc(100% - 40px)); }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; transform: translateY(-150%); background: var(--white); padding: 10px 14px; border-radius: 8px; }
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  color: #eaf5f2;
  background: rgba(7, 27, 33, .94);
  border-bottom: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(18px);
}
.nav-shell { min-height: 72px; display: flex; align-items: center; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand img { display: block; }
.brand small { color: #8eaaa7; font-weight: 600; letter-spacing: .03em; }
.site-header nav { display: flex; gap: 24px; margin-left: auto; }
.site-header nav a { color: #bfd0cd; text-decoration: none; font-size: .92rem; }
.site-header nav a:hover { color: var(--white); }
.prototype-badge { border: 1px solid rgba(255,255,255,.18); color: #b8cac6; padding: 6px 10px; border-radius: 999px; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; }

.hero {
  position: relative;
  overflow: hidden;
  color: #eff7f4;
  background:
    radial-gradient(circle at 82% 18%, rgba(46,113,109,.55), transparent 31%),
    radial-gradient(circle at 8% 76%, rgba(200,149,63,.16), transparent 28%),
    var(--ink-deep);
  padding: 100px 0 94px;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .16;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to right, transparent, black 60%);
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(300px, .7fr); gap: 78px; align-items: center; }
.eyebrow { margin: 0 0 15px; color: #8fc6bc; font-size: .75rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow.dark { color: var(--teal); }
h1, h2, h3 { line-height: 1.08; }
h1 { max-width: 800px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(3.2rem, 7vw, 6.4rem); font-weight: 500; letter-spacing: -.055em; }
h1 em { color: #d6b66e; font-style: normal; }
.hero-lead { max-width: 720px; margin: 28px 0 34px; color: #b9cfcb; font-size: 1.15rem; }
.question-box { max-width: 760px; }
.question-box label { display: block; margin-bottom: 8px; color: #dbe9e6; font-weight: 700; font-size: .9rem; }
.question-input { display: flex; background: var(--white); border: 1px solid rgba(255,255,255,.34); border-radius: 14px; padding: 7px; box-shadow: 0 15px 45px rgba(0,0,0,.24); }
.question-input input { min-width: 0; flex: 1; border: 0; outline: 0; color: var(--ink); background: transparent; padding: 11px 13px; }
.question-input button { border: 0; border-radius: 9px; background: var(--gold); color: #1d241e; padding: 10px 19px; font-weight: 800; cursor: pointer; }
.question-box > small { display: block; margin-top: 9px; color: #829c98; }
.browse-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 19px; color: #cddedb; font-size: .86rem; font-weight: 800; text-decoration-color: #6f918c; text-underline-offset: 4px; }
.browse-link:hover { color: var(--white); }

.hero-aside { padding: 25px; border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius); background: rgba(255,255,255,.055); box-shadow: 0 30px 90px rgba(0,0,0,.2); }
.aside-label { margin: 0 0 17px; color: #8fa9a5; font-size: .75rem; font-weight: 800; text-transform: uppercase; letter-spacing: .12em; }
.lineage-mini { list-style: none; margin: 0; padding: 0; }
.lineage-mini li { position: relative; display: grid; grid-template-columns: 34px 1fr; column-gap: 12px; padding: 8px 0 16px; }
.lineage-mini li:not(:last-child)::after { content: ""; position: absolute; left: 16px; top: 40px; height: 18px; width: 1px; background: rgba(255,255,255,.2); }
.lineage-mini span { grid-row: 1 / 3; display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; color: #d7b56c; font: 700 .7rem/1 ui-monospace, monospace; }
.lineage-mini b { font-size: .95rem; }
.lineage-mini small { color: #839c98; }

.library-section { padding: 100px 0 110px; background: var(--paper-light); }
.library-intro { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; align-items: end; }
.library-intro h2 { max-width: 780px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.8rem, 6vw, 5rem); font-weight: 500; letter-spacing: -.05em; }
.library-intro > p { margin: 0; color: var(--muted); font-size: 1.02rem; }
.library-tools { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin: 42px 0 22px; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-button { border: 1px solid var(--line); border-radius: 999px; padding: 8px 13px; color: var(--muted); background: var(--paper-light); font-size: .78rem; font-weight: 800; cursor: pointer; }
.filter-button:hover { border-color: var(--teal); color: var(--teal); }
.filter-button.active { border-color: var(--ink); color: var(--white); background: var(--ink); }
.result-count { flex: none; margin: 0; color: var(--muted); font: 700 .72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; letter-spacing: .06em; }
.library-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; align-items: start; }
.library-card { border: 1px solid var(--line); border-radius: 18px; background: var(--white); overflow: hidden; box-shadow: 0 12px 35px rgba(7, 27, 33, .055); }
.library-card > header { display: flex; justify-content: space-between; gap: 20px; padding: 20px 22px 0; }
.record-label { display: flex; align-items: center; gap: 9px; }
.record-label span { color: var(--teal); font-size: .68rem; font-weight: 900; text-transform: uppercase; letter-spacing: .09em; }
.record-label code { color: #83908f; font-size: .67rem; }
.record-number { color: #cfcbc0; font: 500 1.7rem/1 Georgia, "Times New Roman", serif; }
.library-card > h3 { margin: 20px 22px 8px; font-family: Georgia, "Times New Roman", serif; font-size: 1.65rem; font-weight: 500; letter-spacing: -.025em; }
.record-question { margin: 0 22px 15px; color: var(--teal); font-size: .85rem; font-weight: 800; }
.record-answer { margin: 0 22px 21px; color: #445b60; font-size: .93rem; }
.record-details { border-top: 1px solid var(--line); background: #f6f3eb; }
.record-details summary { display: flex; justify-content: space-between; align-items: center; padding: 14px 22px; list-style: none; color: var(--ink); font-size: .82rem; font-weight: 900; cursor: pointer; }
.record-details summary::-webkit-details-marker { display: none; }
.record-details summary span { color: var(--teal); font-size: 1.25rem; line-height: 1; }
.record-details[open] summary span { transform: rotate(45deg); }
.record-body { padding: 5px 22px 23px; }
.record-body h4 { margin: 0 0 9px; color: var(--teal); font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; }
.record-block ol { margin: 0; padding-left: 20px; }
.record-block li { margin: 7px 0; color: #40565b; font-size: .86rem; }
.record-warning { margin: 17px 0 13px; padding: 13px 15px; border-left: 3px solid var(--gold); background: #eee4cd; }
.record-warning b { color: #8c6327; font-size: .68rem; text-transform: uppercase; letter-spacing: .07em; }
.record-warning p, .record-note { margin: 4px 0 0; color: #625c50; font-size: .8rem; }
.record-note { margin: 13px 0; }
.record-sources { display: grid; gap: 6px; padding-top: 14px; border-top: 1px solid var(--line); }
.record-sources a { color: var(--teal); font-size: .8rem; font-weight: 800; }
.no-results { grid-column: 1 / -1; margin: 0; padding: 35px; border: 1px dashed #b9c7c4; border-radius: 15px; color: var(--muted); background: #edf3f0; text-align: center; }

.answer-section { padding: 96px 0 105px; background: var(--paper); }
.section-kicker { display: flex; justify-content: space-between; margin-bottom: 12px; color: #718085; font: 700 .7rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; letter-spacing: .08em; }
.answer-card { border: 1px solid var(--line); border-radius: 26px; background: var(--paper-light); overflow: hidden; box-shadow: var(--shadow); }
.answer-head { display: flex; justify-content: space-between; gap: 30px; padding: 38px 40px 26px; border-bottom: 1px solid var(--line); }
.answer-head h2 { max-width: 650px; margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 5vw, 3.6rem); font-weight: 500; letter-spacing: -.04em; }
.confidence { flex: none; display: flex; align-items: center; gap: 12px; }
.confidence-ring { display: grid; place-items: center; width: 48px; height: 48px; border: 3px solid var(--teal); border-radius: 50%; font-weight: 900; }
.confidence div { display: grid; }
.confidence small { color: var(--muted); }
.answer-copy { padding: 31px 40px 22px; font-family: Georgia, "Times New Roman", serif; font-size: 1.25rem; }
.answer-copy p { margin: 0 0 18px; }
.answer-meta { display: grid; grid-template-columns: repeat(4, 1fr); margin: 4px 40px 28px; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.answer-meta div { padding: 15px; border-right: 1px solid var(--line); }
.answer-meta div:last-child { border: 0; }
.answer-meta span, .answer-meta b { display: block; }
.answer-meta span { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .07em; }
.answer-meta b { margin-top: 4px; font-size: .92rem; }
.caveat { display: grid; grid-template-columns: 75px 1fr; margin: 0 40px 26px; padding: 17px 18px; border-left: 3px solid var(--gold); background: #f2ead8; }
.caveat span { color: #946724; font-size: .72rem; font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
.caveat p { margin: 0; color: #5e594f; font-size: .9rem; }
.answer-actions { display: flex; gap: 10px; padding: 0 40px 40px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 44px; border: 1px solid var(--ink); border-radius: 10px; padding: 9px 16px; text-decoration: none; font-weight: 800; cursor: pointer; }
.button.primary { color: var(--white); background: var(--ink); }
.button.secondary { background: transparent; }

.waterfall-section { color: #dceae7; background: var(--ink-deep); padding: 100px 0 110px; }
.waterfall-intro { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; align-items: end; margin-bottom: 45px; }
.waterfall-intro h2, .principles-section h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.8rem, 6vw, 5rem); font-weight: 500; letter-spacing: -.05em; }
.waterfall-intro p { margin: 0 0 14px; color: #99b0ac; }
.text-button { padding: 0; border: 0; border-bottom: 1px solid #779b95; color: #bad5d0; background: transparent; font-weight: 800; cursor: pointer; }
.waterfall-layout { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 34px; }
.waterfall-rail { position: sticky; top: 94px; align-self: start; display: grid; }
.waterfall-rail a { display: flex; align-items: center; gap: 10px; padding: 9px 0; color: #809b96; text-decoration: none; font-size: .85rem; }
.waterfall-rail a:hover { color: var(--white); }
.waterfall-rail span { color: #c79b50; font: 700 .68rem ui-monospace, monospace; }
.waterfall-stack { min-width: 0; }
.layer { margin-bottom: 14px; border: 1px solid rgba(255,255,255,.14); border-radius: 17px; background: rgba(255,255,255,.045); overflow: clip; }
.layer[open] { background: #f5f2e9; color: var(--ink); }
.layer summary { display: grid; grid-template-columns: 50px 1fr auto; gap: 15px; align-items: center; min-height: 82px; padding: 14px 22px; cursor: pointer; list-style: none; }
.layer summary::-webkit-details-marker { display: none; }
.layer summary::after { content: "+"; grid-column: 4; font-size: 1.4rem; color: #8fa49f; }
.layer[open] summary::after { content: "−"; color: var(--teal); }
.layer-number { display: grid; place-items: center; width: 43px; height: 43px; border: 1px solid currentColor; border-radius: 50%; color: #c99b4c; font: 800 .7rem ui-monospace, monospace; }
.layer summary > span:nth-child(2) { display: grid; }
.layer summary small { color: #809b96; font-size: .66rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.layer[open] summary small { color: var(--teal); }
.layer summary b { font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; font-weight: 500; }
.layer-status { padding: 5px 9px; border: 1px solid rgba(255,255,255,.16); border-radius: 999px; color: #94aca8; font-size: .72rem; }
.layer[open] .layer-status { border-color: var(--line); color: var(--muted); }
.layer-status.pending { color: #ddb991; }
.layer-content { padding: 5px 28px 31px 93px; border-top: 1px solid var(--line); }
.layer-purpose { color: var(--muted); }
.source-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
.source-grid article, .claim-list article, .review-grid article, .rationale, .reflection-grid article { border: 1px solid var(--line); border-radius: 13px; background: var(--paper-light); padding: 18px; }
.source-grid article > span { color: var(--teal); font-size: .67rem; font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
.source-grid h3 { margin: 9px 0 7px; font-size: 1rem; line-height: 1.3; }
.source-grid p { color: var(--muted); font-size: .82rem; }
.source-grid a { color: var(--teal); font-size: .8rem; font-weight: 800; }
.evidence-list { list-style: none; margin: 20px 0 0; padding: 0; }
.evidence-list li { display: grid; grid-template-columns: 58px 1fr; gap: 10px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.evidence-list li:last-child { border: 0; }
.evidence-list code, .claim-list code { color: var(--teal); font-weight: 900; }
.evidence-list div { display: grid; }
.evidence-list span { color: var(--muted); font-size: .8rem; }
.claim-list { display: grid; gap: 11px; margin-top: 20px; }
.claim-list header { display: flex; justify-content: space-between; }
.claim-list h3 { margin: 12px 0 6px; font-size: 1.06rem; line-height: 1.4; }
.claim-list p { margin: 0; color: var(--muted); font-size: .84rem; }
.pill { display: inline-flex; align-items: center; border-radius: 999px; padding: 4px 8px; font-size: .65rem; font-weight: 900; text-transform: uppercase; letter-spacing: .05em; }
.pill.supported { color: #24665c; background: var(--teal-light); }
.pill.qualified { color: #8b6423; background: var(--gold-light); }
.pill.pending { color: #8b4a38; background: #f1d7cf; }
.review-grid { display: grid; gap: 10px; margin: 20px 0; }
.review-grid article { display: grid; grid-template-columns: 42px 1fr auto; gap: 13px; align-items: center; }
.avatar { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%; color: var(--white); background: var(--ink); font-size: .7rem; font-weight: 900; }
.review-grid h3 { margin: 0 0 4px; font-size: .95rem; }
.review-grid p { margin: 0; color: var(--muted); font-size: .81rem; }
.challenge-box { padding: 17px; border: 1px dashed var(--gold); border-radius: 12px; background: #f5ead4; }
.challenge-box p { margin: 4px 0 0; color: #6d6558; font-size: .85rem; }
.rationale h3 { margin-top: 0; font-family: Georgia, "Times New Roman", serif; font-size: 1.5rem; }
.rationale > p { font-family: Georgia, "Times New Roman", serif; font-size: 1.08rem; }
.rationale dl { margin: 22px 0 0; }
.rationale dl div { display: grid; grid-template-columns: 150px 1fr; gap: 15px; padding: 11px 0; border-top: 1px solid var(--line); }
.rationale dt { color: var(--teal); font-size: .72rem; font-weight: 900; text-transform: uppercase; letter-spacing: .06em; }
.rationale dd { margin: 0; font-size: .88rem; }
.layer blockquote { margin: 19px 0 0; padding: 22px 24px; border-left: 4px solid var(--teal); background: var(--white); font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; }
.reflection-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 11px; margin-top: 20px; }
.reflection-grid h3 { margin-top: 0; font-size: 1rem; }
.reflection-grid p { margin-bottom: 0; color: var(--muted); font-size: .86rem; }

.principles-section { padding: 110px 0; background: #dfe9e5; }
.principles-section .eyebrow { color: var(--teal); }
.principles-section h2 { color: var(--ink); }
.principle-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 45px; }
.principle-grid article { min-height: 240px; display: flex; flex-direction: column; padding: 24px; border: 1px solid #bdcfca; border-radius: 16px; background: rgba(255,255,255,.45); }
.principle-grid span { color: var(--teal); font: 800 .72rem ui-monospace, monospace; }
.principle-grid h3 { margin: auto 0 10px; font-family: Georgia, "Times New Roman", serif; font-size: 1.5rem; font-weight: 500; }
.principle-grid p { margin: 0; color: #5b706c; font-size: .88rem; }
.closing-section { padding: 82px 0; background: var(--paper); }
.closing-card { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; padding: 48px; border: 1px solid var(--line); border-radius: 22px; background: var(--paper-light); box-shadow: var(--shadow); }
.closing-card h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 4vw, 3.4rem); font-weight: 500; letter-spacing: -.04em; }
.closing-card > p { align-self: end; margin: 0; color: var(--muted); }

.site-footer { color: #99aeaa; background: var(--ink-deep); padding: 30px 0; }
.footer-grid { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; font-size: .8rem; }
.footer-grid p { margin: 0; text-align: center; }
.footer-grid > a { justify-self: end; color: #b9ceca; text-decoration: none; }
.footer-brand { color: var(--white); }
.toast { position: fixed; right: 22px; bottom: 22px; z-index: 80; opacity: 0; transform: translateY(12px); pointer-events: none; color: var(--white); background: var(--ink); border-radius: 10px; padding: 11px 15px; box-shadow: var(--shadow); transition: .2s ease; }
.toast.show { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .site-header nav { display: none; }
  .prototype-badge { margin-left: auto; }
  .hero { padding-top: 72px; }
  .hero-grid, .library-intro, .waterfall-intro, .closing-card { grid-template-columns: 1fr; }
  .hero-aside { max-width: 520px; }
  .answer-meta { grid-template-columns: 1fr 1fr; }
  .answer-meta div:nth-child(2) { border-right: 0; }
  .answer-meta div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .waterfall-layout { grid-template-columns: 1fr; }
  .waterfall-rail { position: static; display: flex; gap: 14px; overflow-x: auto; padding-bottom: 8px; }
  .waterfall-rail a { flex: none; }
  .principle-grid { grid-template-columns: 1fr 1fr; }
  .reflection-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .footer-brand, .footer-grid > a { justify-self: center; }
}

@media (max-width: 620px) {
  .wrap, .narrow { width: min(100% - 24px, 1180px); }
  .nav-shell { min-height: 64px; }
  .brand small, .prototype-badge { display: none; }
  .hero { padding: 58px 0 64px; }
  h1 { font-size: clamp(2.8rem, 14vw, 4.6rem); }
  .hero-lead { font-size: 1rem; }
  .question-input { display: grid; }
  .question-input button { margin-top: 5px; }
  .library-section, .answer-section, .waterfall-section, .principles-section { padding: 70px 0; }
  .library-intro { gap: 18px; }
  .library-tools { align-items: flex-start; flex-direction: column; margin-top: 30px; }
  .filter-bar { flex-wrap: nowrap; width: 100%; overflow-x: auto; padding-bottom: 5px; }
  .filter-button { flex: none; }
  .library-grid { grid-template-columns: 1fr; }
  .library-card > h3 { font-size: 1.45rem; }
  .section-kicker { display: grid; gap: 5px; }
  .answer-head { display: grid; padding: 27px 22px 22px; }
  .confidence { order: -1; }
  .answer-copy { padding: 25px 22px 15px; font-size: 1.1rem; }
  .answer-meta { margin: 4px 22px 22px; grid-template-columns: 1fr; }
  .answer-meta div { border-right: 0; border-bottom: 1px solid var(--line); }
  .answer-meta div:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
  .caveat { grid-template-columns: 1fr; gap: 6px; margin: 0 22px 20px; }
  .answer-actions { padding: 0 22px 28px; flex-direction: column; }
  .waterfall-intro { gap: 22px; }
  .layer summary { grid-template-columns: 44px 1fr; padding: 12px 15px; }
  .layer summary::after { grid-column: 3; grid-row: 1; }
  .layer-status { display: none; }
  .layer-content { padding: 4px 17px 24px; }
  .source-grid, .principle-grid { grid-template-columns: 1fr; }
  .review-grid article { grid-template-columns: 42px 1fr; }
  .review-grid .pill { grid-column: 2; justify-self: start; }
  .rationale dl div { grid-template-columns: 1fr; gap: 5px; }
  .principle-grid article { min-height: 200px; }
  .closing-card { padding: 28px 22px; gap: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}