:root {
  --ink: #0f1b2d;
  --ink-2: #33415a;
  --muted: #5f6b7d;
  --line: #e2ddd2;
  --line-2: #eeeae1;
  --paper: #f7f5f0;
  --card: #ffffff;
  --brass: #b0925a;
  --brass-soft: #d8c9a3;
  --accent: #1d4e89;
  --verified: #1f6b52;   --verified-bg: #e6f2ec;
  --computed: #1d4e89;   --computed-bg: #e7eef8;
  --quoted:   #5b4a8a;   --quoted-bg:   #efebf8;
  --unverified: #9a5b0c; --unverified-bg: #fbf1e2;
  --abstained: #5f6b7d;  --abstained-bg: #eef0f3;
  --danger: #a3261f;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(15,27,45,.05), 0 4px 16px rgba(15,27,45,.05);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 15px/1.55 var(--sans); -webkit-font-smoothing: antialiased;
  font-feature-settings: "tnum" 1, "cv11" 1;
}
a { color: var(--accent); }
code { font-size: .9em; background: var(--line-2); padding: 1px 5px; border-radius: 4px; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
[hidden] { display: none !important; }

/* ---------- top bar ---------- */
.topbar { background: var(--ink); color: #fff; position: sticky; top: 0; z-index: 20; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 600; letter-spacing: .01em; }
.brand-mark { width: 22px; height: 22px; border-radius: 5px; background:
  linear-gradient(to top, var(--brass-soft) 0 45%, transparent 45%) 4px 100%/4px 100% no-repeat,
  linear-gradient(to top, var(--brass-soft) 0 70%, transparent 70%) 9px 100%/4px 100% no-repeat,
  linear-gradient(to top, var(--brass-soft) 0 100%, transparent 100%) 14px 100%/4px 100% no-repeat,
  #22324a; }
.nav { display: flex; gap: 22px; }
.nav a { color: #c9d1dd; text-decoration: none; font-size: 14px; }
.nav a:hover { color: #fff; }

/* ---------- hero ---------- */
.hero { background: var(--ink); color: #fff; padding: 56px 0 64px; border-bottom: 3px solid var(--brass); }
.eyebrow { color: var(--brass-soft); text-transform: uppercase; letter-spacing: .12em; font-size: 12px; font-weight: 600; margin: 0 0 14px; }
.hero h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(30px, 4.2vw, 46px); line-height: 1.15; margin: 0 0 18px; letter-spacing: -.01em; }
.lede { max-width: 720px; color: #c9d1dd; font-size: 17px; margin: 0 0 36px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #2a3a55; border: 1px solid #2a3a55; border-radius: var(--radius); overflow: hidden; margin: 0; }
.hero-stats > div { background: #13223a; padding: 18px 20px; }
.hero-stats dt { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: #93a0b5; }
.hero-stats dd { margin: 6px 0 4px; font-family: var(--serif); font-size: 30px; font-weight: 600; }
.hero-stats dd span { color: var(--brass-soft); font-size: 22px; padding: 0 4px; }
.hero-stats dd .vs { font-family: var(--sans); font-size: 14px; color: #93a0b5; }
.hero-stats p { margin: 0; font-size: 13px; color: #93a0b5; }

/* ---------- demo layout ---------- */
.demo { display: grid; grid-template-columns: 360px 1fr; gap: 24px; margin-top: -28px; position: relative; padding-bottom: 56px; align-items: start; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.filing-panel { position: sticky; top: 76px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; gap: 12px; }
.panel-head h2 { font-family: var(--serif); font-size: 19px; font-weight: 600; margin: 0; }

.drop { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 4px; padding: 26px 16px; border: 1.5px dashed #cfc7b5; border-radius: var(--radius); background: #fbfaf7; cursor: pointer; transition: border-color .15s, background .15s; }
.drop:hover, .drop:focus-visible, .drop.over { border-color: var(--accent); background: #f3f6fb; outline: none; }
.drop-icon { width: 34px; height: 40px; margin-bottom: 8px; border: 2px solid var(--ink-2); border-radius: 3px; position: relative; }
.drop-icon::before, .drop-icon::after { content: ""; position: absolute; left: 6px; right: 6px; height: 2px; background: var(--brass); }
.drop-icon::before { top: 12px; } .drop-icon::after { top: 20px; right: 12px; }
.samples { margin-top: 14px; }
.samples p { margin: 0 0 6px; }

.progress { display: flex; gap: 12px; align-items: center; padding: 14px; background: #f3f6fb; border-radius: var(--radius); margin-top: 12px; }
.progress p { margin: 2px 0 0; }
.spinner { width: 22px; height: 22px; border-radius: 50%; border: 2.5px solid #c9d6ea; border-top-color: var(--accent); animation: spin .8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }

.entity { font-family: var(--serif); font-size: 21px; font-weight: 600; margin: 0; line-height: 1.25; }
.kv { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 14px; margin: 16px 0 6px; }
.kv dt { font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); }
.kv dd { margin: 1px 0 0; font-weight: 600; font-size: 14px; }
.subhead { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 18px 0 6px; font-weight: 600; }
.metrics { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line-2); }
.metrics li { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; padding: 8px 0; border-bottom: 1px solid var(--line-2); }
.metrics .m-label { font-size: 13px; color: var(--ink-2); }
.metrics .m-value { font-weight: 600; text-align: right; }
.metrics .m-period { font-size: 12px; color: var(--muted); }
.metrics .m-change { font-size: 12px; text-align: right; }
.up { color: var(--verified); } .down { color: var(--danger); }
.note { font-size: 13px; background: var(--unverified-bg); color: #5d3a08; border-left: 3px solid var(--unverified); padding: 8px 10px; border-radius: 4px; margin-top: 12px; }
.privacy-inline { margin: 14px 0 0; }

/* ---------- ask ---------- */
.quota { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.quota-bar { width: 90px; height: 6px; background: var(--line-2); border-radius: 6px; overflow: hidden; }
.quota-bar > i { display: block; height: 100%; background: var(--accent); border-radius: 6px; transition: width .3s; }
.model-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 14px; }
.model-opt { text-align: left; background: #fbfaf7; border: 1.5px solid var(--line); border-radius: var(--radius); padding: 10px 14px; cursor: pointer; font: inherit; color: inherit; transition: border-color .15s, background .15s; }
.model-opt:hover { border-color: #b9c3d3; }
.model-opt[aria-checked="true"] { border-color: var(--accent); background: #f3f6fb; box-shadow: inset 0 0 0 1px var(--accent); }
.model-name { display: flex; align-items: center; gap: 6px; font-weight: 600; }
.model-sub { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; }
.lock { width: 10px; height: 8px; background: var(--ink-2); border-radius: 2px; position: relative; margin-top: 4px; }
.lock::before { content: ""; position: absolute; left: 1.5px; top: -5px; width: 5px; height: 6px; border: 1.5px solid var(--ink-2); border-bottom: 0; border-radius: 4px 4px 0 0; }
.unlocked .lock { background: var(--verified); } .unlocked .lock::before { border-color: var(--verified); transform: translateX(3px); }

.ask-form { display: flex; gap: 10px; align-items: stretch; }
.ask-form textarea { flex: 1; resize: none; font: inherit; padding: 11px 14px; border: 1.5px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink); min-height: 48px; }
.ask-form textarea:focus { outline: none; border-color: var(--accent); }
.ask-form textarea:disabled { background: #f4f2ed; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 600 14px var(--sans); padding: 10px 18px; border-radius: 8px; border: 1.5px solid transparent; cursor: pointer; text-decoration: none; white-space: nowrap; }
.btn.primary { background: var(--ink); color: #fff; }
.btn.primary:hover:not(:disabled) { background: #1c2e4a; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn.light { background: var(--brass-soft); color: var(--ink); }
.btn.ghost-light { border-color: #53627c; color: #fff; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; font-size: 13px; color: var(--accent); cursor: pointer; text-decoration: underline; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font: 13px var(--sans); background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px; cursor: pointer; color: var(--ink-2); text-align: left; }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.suggestions { margin-top: 10px; }
.form-error { color: var(--danger); font-size: 13px; margin: 10px 0 0; }

/* ---------- feed & cards ---------- */
.feed { margin-top: 18px; display: flex; flex-direction: column; gap: 16px; }
.empty { border: 1px dashed var(--line); border-radius: var(--radius); padding: 22px; background: #fbfaf7; }
.empty-title { font-family: var(--serif); font-size: 17px; margin: 0 0 12px; }
.legend { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; font-size: 13px; color: var(--muted); }
.legend .badge { margin-right: 6px; }

.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.badge.verified { color: var(--verified); background: var(--verified-bg); }
.badge.computed { color: var(--computed); background: var(--computed-bg); }
.badge.quoted { color: var(--quoted); background: var(--quoted-bg); }
.badge.unverified { color: var(--unverified); background: var(--unverified-bg); }
.badge.abstained { color: var(--abstained); background: var(--abstained-bg); }

.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; animation: rise .25s ease-out; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } }
.card-head { padding: 12px 18px; background: #fbfaf7; border-bottom: 1px solid var(--line-2); display: flex; justify-content: space-between; gap: 12px; align-items: baseline; }
.card-q { margin: 0; font-weight: 600; }
.card-meta { margin: 0; font-size: 12px; color: var(--muted); white-space: nowrap; }
.card-body { padding: 18px; }
.card-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.value { font-family: var(--serif); font-size: 40px; line-height: 1.05; font-weight: 600; letter-spacing: -.01em; margin: 0; }
.value-exact { color: var(--muted); font-size: 13px; margin: 4px 0 0; }
.concept { font-size: 16px; font-weight: 600; margin: 14px 0 2px; }
.qname { font: 12px ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--muted); word-break: break-all; }
.facts-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.tag { font-size: 12px; background: var(--line-2); color: var(--ink-2); border-radius: 5px; padding: 3px 8px; }
.tag.dim { background: #f1ebdc; color: #5b4a22; }
.tag.src { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.summary { margin: 14px 0 0; color: var(--ink-2); }
.status-detail { font-size: 12px; color: var(--muted); margin: 6px 0 0; max-width: 360px; text-align: right; }
.formula { font: 13px ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--computed-bg); color: var(--computed); padding: 8px 12px; border-radius: 6px; margin-top: 12px; overflow-x: auto; }
.inputs { display: grid; gap: 8px; margin-top: 12px; }
.input-row { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; padding: 10px 12px; border: 1px solid var(--line-2); border-radius: 8px; }
.input-row .v { font-weight: 600; text-align: right; }
.input-row .p { font-size: 12px; color: var(--muted); }
blockquote.quote { margin: 14px 0 0; padding: 10px 14px; border-left: 3px solid var(--quoted); background: var(--quoted-bg); font-family: var(--serif); font-size: 16px; }
.warn { font-size: 13px; color: #5d3a08; background: var(--unverified-bg); border-radius: 6px; padding: 8px 10px; margin-top: 12px; }

details.more { margin-top: 16px; border-top: 1px solid var(--line-2); padding-top: 10px; }
details.more summary { cursor: pointer; font-size: 13px; font-weight: 600; color: var(--accent); }
.ev-table { width: 100%; border-collapse: collapse; font-size: 12.5px; margin-top: 10px; }
.ev-table th { text-align: left; font-weight: 600; color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.ev-table td { padding: 6px 8px; border-bottom: 1px solid var(--line-2); vertical-align: top; }
.ev-table td.num { text-align: right; white-space: nowrap; font-weight: 600; }
.ev-table tr.cited td { background: var(--verified-bg); }
.card.pending .card-body { display: flex; gap: 12px; align-items: center; color: var(--muted); }
.card-foot { display: flex; justify-content: space-between; gap: 10px; margin-top: 14px; font-size: 12px; color: var(--muted); }
.copy { font-size: 12px; }

/* ---------- sections ---------- */
.band { background: #efece4; padding: 56px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.band.dark { background: var(--ink); color: #fff; border: 0; }
.section-title { font-family: var(--serif); font-size: 28px; font-weight: 600; margin: 0 0 22px; }
.steps { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.steps li { counter-increment: s; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.steps li::before { content: counter(s, decimal-leading-zero); font-family: var(--serif); color: var(--brass); font-size: 22px; font-weight: 600; }
.steps h3 { margin: 6px 0 6px; font-size: 16px; }
.steps p { margin: 0; font-size: 14px; color: var(--ink-2); }
.results { padding: 56px 24px; }
.results-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: start; }
.results-grid > * { min-width: 0; }
.table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; font-size: 14px; }
.table caption { caption-side: bottom; text-align: left; font-size: 12px; color: var(--muted); padding-top: 8px; }
.table th, .table td { padding: 11px 14px; text-align: right; border-bottom: 1px solid var(--line-2); }
.table th:first-child, .table td:first-child { text-align: left; }
.table th { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); background: #fbfaf7; }
.table td.strong { font-weight: 700; color: var(--verified); }
.findings p { margin: 0 0 14px; }
.contact { display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.contact p { color: #c9d1dd; max-width: 620px; margin: 0; }
.contact-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.footer { padding: 28px 0 40px; }
.footer p { margin: 0 0 8px; }

/* ---------- beginner guide, transparency, FAQ ---------- */
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; margin: -14px 0 32px; }
.section { padding: 56px 24px; }
.section-intro { max-width: 760px; color: var(--ink-2); font-size: 16px; margin: -8px 0 28px; }
.subsection { font-family: var(--serif); font-size: 21px; font-weight: 600; margin: 40px 0 16px; }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.guide-grid > *, .use-grid > *, .transparency > * { min-width: 0; }
.info-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.info-card h3 { font-family: var(--serif); font-size: 19px; margin: 0 0 10px; }
.info-card p { margin: 0 0 10px; font-size: 14.5px; color: var(--ink-2); }
.howto { margin: 0 0 12px; padding-left: 20px; font-size: 14px; color: var(--ink-2); display: grid; gap: 8px; }
.starter { margin: 0 0 12px; padding: 0; list-style: none; display: grid; gap: 6px; }
.starter li { font-size: 14px; background: var(--paper); border: 1px solid var(--line-2); border-radius: 8px; padding: 7px 10px; }
.starter li::before { content: "\201C"; color: var(--brass); font-family: var(--serif); margin-right: 2px; }
.starter li::after { content: "\201D"; color: var(--brass); font-family: var(--serif); margin-left: 1px; }
.use-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.use-card { background: var(--card); border: 1px solid var(--line); border-top: 3px solid var(--brass); border-radius: var(--radius); padding: 16px; }
.use-card h4 { margin: 0 0 6px; font-size: 14.5px; }
.use-card p { margin: 0; font-size: 13.5px; color: var(--ink-2); }
.glossary { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 32px; margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 22px; }
.glossary > div { padding: 12px 0; border-bottom: 1px solid var(--line-2); min-width: 0; }
.glossary dt { font-weight: 600; font-size: 14.5px; }
.glossary dd { margin: 3px 0 0; font-size: 14px; color: var(--ink-2); }
.transparency { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.transparency > div { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.transparency h3 { margin: 0 0 12px; font-size: 16px; }
.transparency .legend { font-size: 13.5px; color: var(--ink-2); }
.plain { margin: 0; padding-left: 18px; display: grid; gap: 8px; font-size: 14px; color: var(--ink-2); }
.faq { max-width: 860px; display: grid; gap: 10px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 0 20px; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 15.5px; padding: 16px 28px 16px 0; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 13px; font-size: 20px; color: var(--brass); font-weight: 400; }
.faq details[open] summary::after { content: "\2212"; }
.faq summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.faq details p { margin: 0 0 18px; color: var(--ink-2); max-width: 720px; }
.footer-links a { color: var(--ink); }

/* ---------- dialogs ---------- */
.dialog { border: 0; border-radius: 14px; padding: 26px; width: min(440px, calc(100vw - 32px)); box-shadow: 0 20px 60px rgba(15,27,45,.3); color: var(--ink); }
.dialog::backdrop { background: rgba(15,27,45,.45); }
.dialog h2 { font-family: var(--serif); margin: 0 0 8px; font-size: 22px; }
.field-label { display: block; font-size: 12px; font-weight: 600; margin: 14px 0 6px; }
.input { width: 100%; font: 16px ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 8px; text-transform: uppercase; }
.input:focus { outline: none; border-color: var(--accent); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin: 18px 0 8px; }
.dialog-actions.stack { flex-direction: column; align-items: stretch; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .demo { grid-template-columns: 1fr; }
  .filing-panel { position: static; }
  .steps { grid-template-columns: 1fr 1fr; }
  .guide-grid, .transparency { grid-template-columns: 1fr; }
  .use-grid { grid-template-columns: 1fr 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .contact { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 620px) {
  .wrap { padding: 0 16px; }
  .nav { display: none; }
  .hero { padding: 36px 0 52px; }
  .hero-stats { grid-template-columns: 1fr; }
  .model-switch { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .use-grid, .glossary { grid-template-columns: 1fr; }
  .section { padding: 40px 16px; }
  .hero-cta { margin-top: -8px; }
  .hero-cta .btn { white-space: normal; text-align: center; }
  .value { font-size: 32px; }
  .card-head { flex-direction: column; gap: 2px; }
  .status-detail { text-align: left; }
  .results { padding: 40px 16px; }
  .ev-table { display: block; overflow-x: auto; }
  .table { font-size: 12.5px; }
  .table th, .table td { padding: 9px 8px; }
  .table th { letter-spacing: 0; font-size: 10px; }
}