@font-face {
  font-display: swap;
  font-family: 'Noto Color Emoji';
  font-style: normal;
  font-weight: 400;
  src: url('./fonts/NotoColorEmoji-COLRv1.woff2') format('woff2');
}

/* Tokens mirror the app's rendered vellum design system (see styles.css /
   vellum-ui) so this page reads as the app introducing itself. */
:root {
  color-scheme: light;
  --bg: #f7f2ea;
  --surface: #f1eae0;
  --surface-sunken: #e8ddcf;
  --surface-raised: #fffdf8;
  --ink: #2d2520;
  --ink-strong: #211a17;
  --ink-muted: #71665d;
  --ink-inverse: #fffdfa;
  --line: rgba(67, 50, 41, 0.17);
  --line-strong: #8d7c70;
  --accent: #653d78;
  --accent-soft: #eee3f2;
  --serif: 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --sans:
    system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Noto Color Emoji';
  --mono: ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', monospace, 'Noto Color Emoji';
  --measure: 62ch;
  --gutter: clamp(20px, 5vw, 56px);
}

[data-theme='dark'] {
  color-scheme: dark;
  --bg: #1a1512;
  --surface: #221c17;
  --surface-sunken: #14100d;
  --surface-raised: #282019;
  --ink: #e9e0d5;
  --ink-strong: #f5ede2;
  --ink-muted: #a2968a;
  --ink-inverse: #211a17;
  --line: rgba(233, 224, 213, 0.16);
  --line-strong: #6d6157;
  --accent: #b993cc;
  --accent-soft: rgba(185, 147, 204, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--surface-raised);
  border: 1px solid var(--line-strong);
  padding: 6px 12px;
  z-index: 20;
}

.skip-link:focus {
  left: 8px;
}

/* ---- header ---- */

.page-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
  padding: 28px var(--gutter) 0;
}

.wordmark {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink-strong);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.head-links {
  display: flex;
  align-items: baseline;
  gap: 20px;
  font-size: 0.9rem;
}

.head-links a {
  color: var(--ink-muted);
  text-decoration: none;
}

.head-links a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.head-links .head-cta {
  color: var(--accent);
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  padding: 6px 14px;
  background: var(--surface-raised);
}

.head-links .head-cta:hover {
  border-color: var(--accent);
  text-decoration: none;
  background: var(--accent-soft);
}

/* ---- hero ---- */

.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: clamp(48px, 9vh, 96px) var(--gutter) 0;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.1rem, 5.2vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink-strong);
  margin: 0;
  max-width: 18ch;
  text-wrap: balance;
}

.lede {
  max-width: var(--measure);
  font-size: 1.06rem;
  color: var(--ink);
  margin: 20px 0 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.button {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.92rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--surface-raised);
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  padding: 9px 18px;
  transition:
    background 120ms ease,
    border-color 120ms ease;
}

.button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--ink-strong);
}

.button-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--ink-inverse);
}

.button-primary:hover {
  background: var(--accent);
  color: var(--ink-inverse);
  filter: brightness(1.08);
}

/* ---- plates (screenshots framed like reference-book figures) ---- */

.plate {
  margin: clamp(36px, 6vh, 56px) 0 0;
}

.plate .screenshot-expand {
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  overflow: hidden;
  background: var(--surface-sunken);
  cursor: zoom-in;
  box-shadow:
    0 1px 0 var(--line),
    0 12px 28px -18px rgba(45, 37, 32, 0.45);
}

.plate .screenshot-expand:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.plate figcaption {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-muted);
  margin-top: 10px;
  letter-spacing: 0.02em;
}

/* ---- arguments (editorial numbered sections) ---- */

.argument {
  max-width: 960px;
  margin: 0 auto;
  padding: clamp(48px, 9vh, 88px) var(--gutter) 0;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 0 28px;
}

.argument-marker {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-muted);
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}

.argument-body {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.argument h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
  color: var(--ink-strong);
  margin: 0 0 12px;
}

.argument p {
  max-width: var(--measure);
  margin: 0 0 14px;
}

.fact-list {
  max-width: var(--measure);
  margin: 0;
  padding: 0;
  list-style: none;
}

.fact-list li {
  padding: 9px 0 9px 22px;
  position: relative;
  border-top: 1px solid var(--line);
}

.fact-list li::before {
  content: '·';
  position: absolute;
  left: 6px;
  color: var(--accent);
  font-weight: 700;
}

.aside {
  font-size: 0.92rem;
  color: var(--ink-muted);
  border-left: 2px solid var(--accent);
  padding-left: 14px;
}

/* ---- cli / mcp proof block ---- */

.ways-proof {
  max-width: var(--measure);
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  padding: 16px 18px;
  margin: 6px 0 10px;
}

.ways-proof pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--ink-strong);
  overflow-x: auto;
}

.ways-proof .prompt {
  color: var(--ink-muted);
  user-select: none;
}

.proof-line {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin: 12px 0 6px;
}

.proof-line code {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-strong);
  background: var(--surface-sunken);
  border-radius: 4px;
  padding: 1px 5px;
  overflow-wrap: anywhere;
}

.text-link {
  font-size: 0.9rem;
}

.proof-links {
  display: flex;
  gap: 18px;
  margin: 0;
}

/* ---- plain facts ---- */

.fine-print {
  max-width: 960px;
  margin: clamp(56px, 10vh, 104px) auto 0;
  padding: 0 var(--gutter);
}

.fine-print h2 {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin: 0 0 4px;
}

.fine-print dl {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.fine-print dl > div {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.fine-print dt {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  padding-top: 2px;
}

.fine-print dd {
  margin: 0;
  font-size: 0.94rem;
  max-width: var(--measure);
}

/* ---- closer ---- */

.closer {
  max-width: 960px;
  margin: 0 auto;
  padding: clamp(56px, 10vh, 104px) var(--gutter) clamp(64px, 10vh, 112px);
  text-align: center;
}

.closer p {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  color: var(--ink-strong);
  margin: 0 0 22px;
  text-wrap: balance;
}

.closer .hero-actions {
  justify-content: center;
  margin-top: 0;
}

/* ---- lightbox (DOM contract shared with features.js) ---- */

.screenshot-lightbox {
  border: none;
  padding: 0;
  background: transparent;
  max-width: min(1200px, 94vw);
  width: 100%;
}

.screenshot-lightbox::backdrop {
  background: rgba(33, 26, 23, 0.72);
}

.screenshot-lightbox-shell {
  background: var(--surface-raised);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  overflow: hidden;
}

.screenshot-lightbox-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.screenshot-lightbox-head button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  cursor: pointer;
}

.screenshot-lightbox-head button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.screenshot-lightbox-stage img {
  width: 100%;
  max-height: 80vh;
  object-fit: contain;
  background: var(--surface-sunken);
}

/* ---- footer ---- */

.page-foot {
  border-top: 1px solid var(--line-strong);
  background: var(--surface);
  margin-top: 0;
}

.page-foot {
  padding: 32px var(--gutter) 40px;
}

.page-foot .wordmark {
  font-size: 1.1rem;
}

.page-foot nav {
  display: flex;
  gap: 18px;
  margin: 12px 0 16px;
  font-size: 0.9rem;
}

.page-foot nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

.page-foot nav a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer-attribution {
  max-width: 72ch;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--ink-muted);
  margin: 0;
}

/* ---- responsive ---- */

@media (max-width: 720px) {
  .argument {
    grid-template-columns: minmax(0, 1fr);
  }

  .argument-marker {
    border-top: none;
    padding-top: 0;
    margin-bottom: 2px;
  }

  .fine-print dl > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-head {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .button {
    transition: none;
  }
}