@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #FFFFFF;
  --bg-raised: #FFFFFF;
  --bg-sunken: #FAFAFA;
  --ink: #0A0A0A;
  --ink-soft: #6B6B6B;
  --line: #E8E8E8;
  --accent: #2647E8;
  --accent-ink: #FFFFFF;
  --danger: #C0362C;
  --danger-bg: #FBEBE9;
  --radius: 6px;
}

:root[data-theme="dark"] {
  --bg: #0A0A0A;
  --bg-raised: #131313;
  --bg-sunken: #050505;
  --ink: #F2F2F2;
  --ink-soft: #8C8C8C;
  --line: #232323;
  --accent: #5C7CFF;
  --accent-ink: #0A0A0A;
  --danger: #E5645A;
  --danger-bg: #2A1512;
}

/* Light is the default regardless of OS/browser preference — this is a
   product-storefront site, not a developer tool, and reads as brighter and
   more approachable in the vein of Anthropic/OpenAI's marketing pages.
   Dark mode is still available, opted into via data-theme="dark" (e.g. a
   future toggle control), just never auto-applied from prefers-color-scheme. */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 {
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 0.5em;
}
h1 { font-size: 3rem; line-height: 1.08; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.1rem; }
code, .mono, .num { font-family: 'IBM Plex Mono', monospace; }
a { color: var(--ink); text-decoration-color: var(--line); }
a:hover { color: var(--accent); }
p { color: var(--ink-soft); }

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 640px; margin: 0 auto; padding: 0 24px; }

.nav { border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; flex-wrap: wrap; gap: 8px 16px; }
.brand { font-weight: 700; font-size: 1.2rem; color: var(--ink); letter-spacing: -0.03em; }
.brand:hover { color: var(--ink); }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 20px; font-size: 0.9rem; }
.nav-links a { color: var(--ink-soft); }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 700px) {
  .nav .wrap { height: auto; padding: 12px 16px; }
  .nav-links { gap: 8px 14px; font-size: 0.85rem; }
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius); border: 1px solid transparent;
  font-size: 0.9rem; font-weight: 500; cursor: pointer; font-family: inherit;
  transition: opacity 0.12s ease;
}
.btn:hover { opacity: 0.82; text-decoration: none; }
.btn:active { opacity: 0.7; }
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-secondary { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.4; cursor: not-allowed; }

.card {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 28px;
}

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.82rem; font-weight: 500; color: var(--ink-soft); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: var(--radius);
  font-family: inherit; font-size: 0.95rem; background: var(--bg); color: var(--ink);
}
.field input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: var(--accent); }

.badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px;
  font-size: 0.75rem; font-weight: 500; background: var(--bg-sunken); color: var(--ink-soft); border: 1px solid var(--line);
}
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

.error-banner {
  background: var(--danger-bg); border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--danger); padding: 10px 14px; border-radius: var(--radius); font-size: 0.88rem; margin-bottom: 16px;
}

.hero { padding: 88px 0 64px; }
.hero .eyebrow { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.hero h1 { max-width: 700px; }
.hero p.lede { font-size: 1.15rem; max-width: 560px; margin: 20px 0 32px; }
.hero-actions { display: flex; gap: 12px; }

/* Parallax hero — the dot-grid background layer translates slower than the
   scrolling content (rAF-throttled JS sets the transform), picking up a
   subtle scale + blur as it recedes for a light depth effect. Pure CSS +
   ~20 lines of vanilla JS, no libraries. With JS off, or under
   prefers-reduced-motion, the layer simply sits static — fully readable
   either way. Same dot-grid visual language as .grid-graphic/.chart-card. */
.hero-parallax { position: relative; overflow: hidden; }
.hero-parallax-bg {
  position: absolute; inset: -30% -5%; z-index: 0; pointer-events: none;
  background-image:
    radial-gradient(ellipse 55% 45% at 78% 18%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 70%),
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: auto, 40px 40px, 40px 40px;
  opacity: 0.5;
  will-change: transform, filter;
}
.hero-parallax .hero-content { position: relative; z-index: 1; }
@media (prefers-reduced-motion: reduce) {
  .hero-parallax-bg { transform: none !important; filter: none !important; }
}

/* Abstract "data grid" graphic — sharp geometric lines, not an illustration */
.grid-graphic {
  height: 280px; border: 1px solid var(--line); border-radius: 10px; margin: 56px 0;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 40px 40px;
  background-color: var(--bg-sunken);
  position: relative;
  overflow: hidden;
}
.grid-graphic .node { position: absolute; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.grid-graphic .node::after { content: ''; position: absolute; inset: -6px; border: 1px solid var(--accent); border-radius: 50%; opacity: 0.35; }

.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin: 56px 0; }
.stat-cell { padding: 24px; border-right: 1px solid var(--line); }
.stat-cell:last-child { border-right: none; }
.stat-cell .num { font-size: 2rem; font-weight: 600; display: block; color: var(--ink); }
.stat-cell .label { font-size: 0.85rem; color: var(--ink-soft); margin-top: 4px; }

.section-title { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft); font-weight: 600; margin-bottom: 16px; }

.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin: 24px 0 40px; }
.category-cell { background: var(--bg-raised); padding: 20px 24px; display: block; color: var(--ink); text-decoration: none; transition: background 0.12s ease; }
.category-cell:hover { background: var(--bg-sunken); color: var(--ink); text-decoration: none; }
.category-cell .count { font-family: 'IBM Plex Mono', monospace; color: var(--accent); font-size: 0.85rem; }

.taxonomy-grid, .product-meta-grid, .asset-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
}
.taxonomy-cell, .meta-cell, .asset-cell { background: var(--bg-raised); padding: 16px 18px; }
.meta-label { display:block; font-family:'IBM Plex Mono', monospace; font-size:0.72rem; text-transform:uppercase; letter-spacing:0.04em; color:var(--ink-soft); margin-bottom:4px; }
.meta-value { display:block; font-size:0.9rem; color:var(--ink); }
.asset-grid { grid-template-columns: repeat(2, 1fr); }
.asset-cell .amount small { font-size:0.82rem; font-weight:400; color:var(--ink-soft); }
.product-stat-row { grid-template-columns: repeat(4, 1fr); margin:16px 0; }
.product-stat-row .stat-cell .num { font-size:1.35rem; }
@media (max-width: 800px) {
  .taxonomy-grid, .product-meta-grid, .asset-grid, .product-stat-row { grid-template-columns: 1fr; }
}

.callout-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; border: 1px solid var(--line); border-radius: 10px; padding: 22px 26px; margin: 0 0 48px; }
.callout-band h3 { margin: 0; font-size: 1.02rem; }
@media (max-width: 700px) { .callout-band { flex-direction: column; align-items: flex-start; } }
@media (max-width: 700px) { .category-grid { grid-template-columns: 1fr; } .hero h1 { font-size: 2.2rem; } .stat-row { grid-template-columns: repeat(2, 1fr); } }

.runtime-layer-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.runtime-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.runtime-flow-step {
  min-height: 112px; background: var(--bg-raised); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px; display: flex; flex-direction: column; justify-content: space-between; gap: 16px;
}
@media (max-width: 900px) {
  .runtime-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .runtime-layer-grid, .runtime-flow { grid-template-columns: 1fr; }
}

.pricing { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 700px) { .pricing { grid-template-columns: 1fr; } }
.price-card .amount { font-size: 2.4rem; font-weight: 600; margin: 14px 0 4px; letter-spacing: -0.02em; }
.price-card .amount small { font-size: 1rem; font-weight: 400; color: var(--ink-soft); }
.price-card ul { list-style: none; padding: 0; margin: 20px 0; font-size: 0.9rem; }
.price-card li { padding: 9px 0; border-top: 1px solid var(--line); color: var(--ink-soft); display: flex; gap: 8px; }
.price-card li:first-child { border-top: none; }
.price-card li::before { content: '-'; color: var(--ink-soft); }

/* Generic per-row preview card for the 13 smaller verification products —
   every product's row shape differs, so key/value pairs render inline for
   primitives and pretty-printed JSON for nested objects/arrays. */
.kv-list { display: grid; grid-template-columns: 200px 1fr; gap: 10px 16px; margin: 0; }
.kv-list dt { font-family: 'IBM Plex Mono', monospace; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); align-self: start; padding-top: 3px; }
.kv-list dd { margin: 0; font-size: 0.92rem; word-break: break-word; align-self: start; }
.kv-pre { background: var(--bg-sunken); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; overflow-x: auto; font-size: 0.8rem; line-height: 1.5; white-space: pre-wrap; word-break: break-word; margin: 0; }
@media (max-width: 700px) { .kv-list { grid-template-columns: 1fr; } .kv-list dt { padding-top: 0; } }

.sample-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.sample-table th { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-weight: 500; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }
.sample-table td { padding: 10px 14px; border-bottom: 1px solid var(--line); }
.sample-table tr:last-child td { border-bottom: none; }
.table-wrap { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; overflow-x: auto; }

.chart-card { border: 1px solid var(--line); border-radius: 10px; padding: 24px 28px 20px; margin: 20px 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 32px 32px; background-color: var(--bg-sunken); background-position: -1px -1px; }
.chart-card-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.chart-card-head h3 { margin: 0; font-size: 0.98rem; }
.chart-card-head .muted { font-size: 0.8rem; }
.chart-label { font-size: 12px; fill: var(--ink-soft); font-family: 'Instrument Sans', sans-serif; }
.chart-value { font-size: 12px; fill: var(--ink); }
.chart-track { fill: var(--line); opacity: 0.6; }
.chart-bar { fill: var(--accent); }
.chart-bar-alt { fill: var(--ink); opacity: 0.55; }
.chart-foot { font-size: 0.82rem; margin: 14px 0 0; }
.chart-foot code { font-family: 'IBM Plex Mono', monospace; background: var(--bg-sunken); padding: 1px 6px; border-radius: 3px; color: var(--ink); }

.verify-row { display: grid; grid-template-columns: 220px 1fr 48px; align-items: center; gap: 14px; margin-bottom: 14px; }
.verify-row:last-of-type { margin-bottom: 0; }
.verify-label { font-size: 0.88rem; color: var(--ink-soft); }
.verify-track { height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.verify-fill { height: 100%; background: var(--accent); border-radius: 4px; }
.verify-fill.alt { background: var(--ink); opacity: 0.55; }
.verify-pct { font-size: 0.85rem; text-align: right; }
@media (max-width: 700px) { .verify-row { grid-template-columns: 1fr; gap: 6px; } .verify-pct { text-align: left; } }

.charts-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 20px 0 56px; align-items: start; }
@media (max-width: 900px) { .charts-grid { grid-template-columns: 1fr; } }

/* "How it works" page — a step pipeline with a light 3D fan, and a
   receipt-style card that tilts toward the cursor. Both are plain CSS
   perspective/transform (no WebGL, no animation libraries) — the tilt is a
   ~15-line vanilla-JS mousemove handler, everything degrades to a flat,
   perfectly readable card with JS off. */
.pipeline { display: flex; gap: 18px; margin: 40px 0 8px; perspective: 1600px; }
@media (max-width: 900px) { .pipeline { flex-direction: column; } }
.pipeline-step {
  flex: 1; background: var(--bg-raised); border: 1px solid var(--line); border-radius: 10px;
  padding: 22px 20px; position: relative; transform-style: preserve-3d;
  transition: transform 0.25s ease, box-shadow 0.25s ease; will-change: transform;
}
.pipeline-step:nth-child(1) { transform: rotateY(6deg); }
.pipeline-step:nth-child(2) { transform: rotateY(3deg); }
.pipeline-step:nth-child(3) { transform: rotateY(-3deg); }
.pipeline-step:nth-child(4) { transform: rotateY(-6deg); }
.pipeline-step:hover { transform: rotateY(0deg) translateY(-4px); box-shadow: 0 16px 32px -20px rgba(0,0,0,0.35); }
@media (max-width: 900px) { .pipeline-step { transform: none !important; } .pipeline-step:hover { transform: translateX(4px) !important; } }
.pipeline-step .step-num { font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; color: var(--accent); margin-bottom: 10px; display: block; }
.pipeline-step h4 { margin: 0 0 8px; font-size: 1rem; font-weight: 600; }
.pipeline-step p { margin: 0; font-size: 0.86rem; color: var(--ink-soft); line-height: 1.55; }
.pipeline-arrow { display: flex; align-items: center; justify-content: center; color: var(--line); font-size: 1.3rem; padding-top: 40px; }
@media (max-width: 900px) { .pipeline-arrow { transform: rotate(90deg); padding: 4px 0; } }

.receipt-wrap { perspective: 1200px; margin: 40px 0; }
.receipt-card {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.86rem; max-width: 480px; margin: 0 auto;
  background: var(--bg-raised); border: 1px solid var(--line); border-radius: 10px;
  padding: 26px 26px 22px; box-shadow: 0 20px 40px -28px rgba(0,0,0,0.4);
  transform-style: preserve-3d; transition: transform 0.08s linear; will-change: transform;
}
.receipt-card .receipt-head { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px dashed var(--line); padding-bottom: 12px; margin-bottom: 14px; }
.receipt-card .receipt-head span:first-child { color: var(--ink-soft); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; }
.receipt-row { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; border-bottom: 1px dashed var(--line); }
.receipt-row:last-of-type { border-bottom: none; }
.receipt-row .k { color: var(--ink-soft); flex-shrink: 0; }
.receipt-row .v { text-align: right; word-break: break-word; }
.receipt-row .v.link { color: var(--accent); }
.receipt-verdict { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--line); display: flex; justify-content: space-between; align-items: center; }
.receipt-verdict .v-label { font-weight: 600; }
.receipt-verdict .v-tag { background: var(--bg-sunken); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; font-size: 0.72rem; }
@media (max-width: 520px) {
  .receipt-card { font-size: 0.8rem; padding: 20px 18px 18px; }
  .receipt-row { flex-direction: column; gap: 4px; }
  .receipt-row .v { text-align: left; }
}

.footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--ink-soft); font-size: 0.85rem; margin-top: 80px; }
.row-between { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 6px 24px; }
.muted { color: var(--ink-soft); }
.stack { display: flex; flex-direction: column; gap: 16px; }
.mt-16 { margin-top: 16px; } .mt-32 { margin-top: 32px; } .mt-48 { margin-top: 48px; } .mt-64 { margin-top: 64px; }

/* Company overview and editorial pages share the existing type and color system. */
.company-page { padding-bottom: 48px; }
.company-page .hero { padding-bottom: 56px; }
.company-hero { display: grid; grid-template-columns: 1.5fr 1fr; gap: 56px; align-items: center; }
.company-hero h1 { font-size: clamp(2.25rem,4vw,3.4rem); }
.company-page .hero-actions { flex-wrap: wrap; }
.brand, .nav-links a, .btn { text-decoration: none; }
.company-evidence { border: 1px solid var(--line); background: var(--bg-sunken); padding: 28px; border-radius: 10px; }
.company-evidence div { padding: 20px 0; border-top: 1px solid var(--line); }
.company-evidence span { display: block; font: 0.75rem 'IBM Plex Mono',monospace; color: var(--accent); margin-bottom: 8px; }
.company-evidence strong { display: block; font-size: 1.05rem; }
.company-evidence p:last-child { margin-bottom: 0; font-size: .85rem; }
.company-section { border-top: 1px solid var(--line); padding: 56px 0; scroll-margin-top: 24px; }
.company-heading { max-width: 680px; margin-bottom: 28px; }
.company-heading h2 { margin-bottom: 12px; }
.company-steps { list-style: none; padding: 0; margin: 32px 0 0; display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 24px; counter-reset: step; }
.company-steps li { counter-increment: step; min-width: 0; }
.company-steps li::before { content: '0' counter(step); display: block; color: var(--accent); font: .85rem 'IBM Plex Mono',monospace; border-top: 2px solid var(--accent); padding-top: 16px; margin-bottom: 20px; }
.company-steps p { font-size: .95rem; }
.company-offer { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; border: 1px solid var(--line); border-radius: 12px; padding: 36px; margin: 16px 0 56px; background: var(--bg-sunken); scroll-margin-top: 24px; }
.company-purchase { padding: 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); align-self: start; }
.company-price { font-size: 2.6rem; font-weight: 600; color: var(--ink); margin: 12px 0 0; letter-spacing: -.04em; }
.company-price span { font-size: .85rem; font-weight: 400; letter-spacing: 0; }
.company-note { font-size: .85rem; line-height: 1.65; }
.company-inclusions { padding-left: 20px; }
.company-inclusions li { margin: 10px 0; }
.company-split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.company-jump { display: flex; flex-wrap: wrap; gap: 12px 24px; padding-top: 12px; font-size: .9rem; }
.company-jump a { text-underline-offset: 5px; }
.article-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; padding-bottom: 56px; }
.article-card { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 10px; padding: 32px; }
.article-card:first-child { grid-column: 1 / -1; background: var(--bg-sunken); }
.article-card h2 { font-size: 1.5rem; }
.article-card h2 a { text-decoration: none; }
.article-read { margin-top: auto; padding-top: 16px; color: var(--accent); }
.company-article { max-width: 780px; margin: 0 auto; padding: 48px 24px 64px; }
.article-back { display: inline-block; margin-bottom: 36px; color: var(--ink-soft); }
.company-article h1 { font-size: clamp(2rem,4vw,3rem); }
.article-dek { font-size: 1.2rem; }
.article-byline { font-size: .85rem; }
.article-contents { padding: 24px; margin: 32px 0; background: var(--bg-sunken); border: 1px solid var(--line); border-radius: 8px; }
.article-contents a { display: block; margin-top: 10px; }
.company-article section { margin: 40px 0; scroll-margin-top: 24px; }
.company-article section p { color: var(--ink); font-size: 1.05rem; line-height: 1.8; }
.company-article h2 { font-size: 1.65rem; }
@media(max-width:900px) { .company-hero { grid-template-columns: 1fr; gap: 24px; } .company-steps { grid-template-columns: repeat(2,minmax(0,1fr)); } }
@media(max-width:600px) { .company-offer,.company-split,.article-grid,.company-steps { grid-template-columns: 1fr; } .company-offer { padding: 24px; gap: 20px; } .company-purchase { padding: 20px; } .company-split { gap: 32px; } .company-section { padding: 36px 0; } .company-page .hero { padding-top: 48px; } .article-card { padding: 24px; } .company-article { padding-top: 32px; } }

.footer-grid { display:grid; grid-template-columns:1.5fr repeat(3,1fr); gap:32px; align-items:start; }
.footer-grid h2 { font-size:.85rem; margin:0 0 16px; }
.footer-grid nav a { display:block; margin:0 0 10px; text-decoration:none; }
.footer-grid nav span { display:block; color:var(--ink-soft); font-size:.75rem; }
.footer-about p { max-width:240px; margin:12px 0; }
.footer-copyright { padding-top:16px; }
@media(max-width:760px) { .footer-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:28px; } }
@media(max-width:420px) { .footer-about { grid-column:1 / -1; } }