/* sight4agents: "Sites with sight."  Brand tokens are documented in BRAND.md and at /brand. */

@font-face { font-family: "Space Grotesk"; src: url("/fonts/space-grotesk-latin-wght-normal.woff2?v=0640890476") format("woff2-variations"), url("/fonts/space-grotesk-latin-wght-normal.woff2?v=0640890476") format("woff2"); font-weight: 300 700; font-display: swap; }
@font-face { font-family: "Inter"; src: url("/fonts/inter-latin-wght-normal.woff2?v=3100e775e8") format("woff2-variations"), url("/fonts/inter-latin-wght-normal.woff2?v=3100e775e8") format("woff2"); font-weight: 100 900; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url("/fonts/jetbrains-mono-latin-wght-normal.woff2?v=18be452724") format("woff2-variations"), url("/fonts/jetbrains-mono-latin-wght-normal.woff2?v=18be452724") format("woff2"); font-weight: 100 800; font-display: swap; }

:root {
  /* Brand palette (fixed) */
  --s4a-ink: #0E1020;
  --s4a-paper: #F6F5F0;
  --s4a-iris: #5B3DF5;
  --s4a-iris-light: #A493FF;
  --s4a-signal: #C6F432;
  --s4a-slate: #575D6E;
  --s4a-mist: #E4E2DA;
  --s4a-night: #161A2E;

  /* Type */
  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Semantic tokens (light) */
  --bg: var(--s4a-paper);
  --surface: #FFFFFF;
  --surface-2: #EFEDE6;
  --fg: var(--s4a-ink);
  --muted: var(--s4a-slate);
  --border: var(--s4a-mist);
  --accent: var(--s4a-iris);
  --accent-fg: #FFFFFF;
  --accent-soft: #ECE8FF;
  --signal: var(--s4a-signal);
  --code-bg: #EFEDE6;
  --radius: 16px;
  --maxw: 74rem;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--s4a-ink);
    --surface: var(--s4a-night);
    --surface-2: #1C2138;
    --fg: var(--s4a-paper);
    --muted: #A6ABBD;
    --border: #262B45;
    --accent: var(--s4a-iris-light);
    --accent-fg: var(--s4a-ink);
    --accent-soft: #221E4A;
    --code-bg: #12162A;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }
body { margin: 0; background: var(--bg); color: var(--fg); font: 400 1.0625rem/1.65 var(--font-body); font-feature-settings: "cv11", "ss01"; -webkit-font-smoothing: antialiased; }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
a { color: var(--accent); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; border-radius: 6px; box-shadow: 0 0 0 6px color-mix(in srgb, var(--s4a-ink) 70%, transparent); }
::selection { background: var(--signal); color: var(--s4a-ink); }
code { font-family: var(--font-mono); font-size: 0.86em; background: var(--code-bg); padding: 0.12em 0.4em; border-radius: 6px; }
pre { font-family: var(--font-mono); background: var(--s4a-ink); color: var(--s4a-paper); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.3rem; overflow-x: auto; line-height: 1.55; font-size: 0.875rem; }
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 0.6em; font-weight: 700; }
h1 { font-size: clamp(2.3rem, 5.4vw, 4rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.25rem); }
h3 { font-size: 1.15rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }

/* "Seen" highlight: an agent's focus box with corner brackets */
mark.seen { color: inherit; background: none; position: relative; padding: 0 0.12em; white-space: nowrap;
  background-image:
    linear-gradient(var(--signal), var(--signal)), linear-gradient(var(--signal), var(--signal)),
    linear-gradient(var(--signal), var(--signal)), linear-gradient(var(--signal), var(--signal)),
    linear-gradient(var(--signal), var(--signal)), linear-gradient(var(--signal), var(--signal)),
    linear-gradient(var(--signal), var(--signal)), linear-gradient(var(--signal), var(--signal)),
    linear-gradient(color-mix(in srgb, var(--signal) 28%, transparent), color-mix(in srgb, var(--signal) 28%, transparent));
  background-repeat: no-repeat;
  background-size: 0.32em 0.08em, 0.08em 0.32em, 0.32em 0.08em, 0.08em 0.32em, 0.32em 0.08em, 0.08em 0.32em, 0.32em 0.08em, 0.08em 0.32em, 100% 38%;
  background-position: 0 0.08em, 0 0.08em, 100% 0.08em, 100% 0.08em, 0 100%, 0 100%, 100% 100%, 100% 100%, 0 82%;
}

.skip { position: absolute; left: -9999px; top: 0; background: var(--signal); color: var(--s4a-ink); padding: 0.5rem 1rem; z-index: 10; font-weight: 600; }
.skip:focus { left: 1rem; top: 1rem; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 0.75rem 1.5rem; min-height: 4.25rem; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--fg); text-decoration: none; }
.wordmark { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; letter-spacing: -0.03em; }
.wordmark .four { color: var(--accent); }
.site-header nav { margin-left: auto; }
nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; }
.site-header nav a { color: var(--muted); text-decoration: none; font-weight: 500; padding: 0.35rem 0; font-size: 0.97rem; }
.site-header nav a:hover, .site-header nav a[aria-current="page"] { color: var(--fg); }
.site-header nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--signal); }
.agent-toggle { font-family: var(--font-mono); font-size: 0.8rem; text-decoration: none; color: var(--fg); border: 1px solid var(--border); background: var(--surface); padding: 0.35rem 0.7rem; border-radius: 999px; white-space: nowrap; }
.agent-toggle span { color: var(--accent); font-weight: 700; }
.agent-toggle:hover { border-color: var(--accent); }

/* Sections */
main > section { padding: 4rem 0; border-bottom: 1px solid var(--border); }
main > section:last-child { border-bottom: 0; }
main > section > p, main > section > .list { max-width: 46rem; }
.eyebrow { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--font-mono); color: var(--fg); font-weight: 500; font-size: 0.82rem; letter-spacing: 0.02em; border: 1px solid var(--border); background: var(--surface); padding: 0.3rem 0.75rem; border-radius: 999px; }
.eyebrow::before { content: ""; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 3px color-mix(in srgb, var(--signal) 30%, transparent); }
.lead { font-size: clamp(1.1rem, 2vw, 1.28rem); color: var(--muted); max-width: 42rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }

.hero { padding: 5rem 0 4.5rem !important; }
.hero-sm { padding: 4rem 0 3rem !important; }
.hero-home { display: grid; gap: 3rem; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); align-items: center; }
.hero-home h1 { margin-top: 1.25rem; max-width: 16ch; }

/* Agent view panel */
.agent-view { margin: 0; background: var(--s4a-ink); color: var(--s4a-paper); border-radius: 20px; border: 1px solid #262B45; box-shadow: 0 30px 60px -30px color-mix(in srgb, var(--s4a-iris) 55%, transparent), 0 0 0 6px color-mix(in srgb, var(--s4a-iris) 12%, transparent); overflow: hidden; }
.agent-view-bar { display: flex; align-items: center; gap: 0.4rem; padding: 0.75rem 1rem; border-bottom: 1px solid #262B45; }
.agent-view-bar span { width: 0.65rem; height: 0.65rem; border-radius: 50%; background: #3A4060; }
.agent-view-bar span.lit { background: var(--s4a-signal); }
.agent-view-bar b { margin-left: auto; font: 500 0.75rem var(--font-mono); color: #A6ABBD; letter-spacing: 0.04em; }
.agent-view pre { margin: 0; border: 0; border-radius: 0; background: transparent; font-size: 0.84rem; white-space: pre-wrap; word-break: break-word; }
.av-cmd { color: var(--s4a-iris-light); }
.av-out { color: var(--s4a-paper); }
.av-warn { color: var(--s4a-ink); background: var(--s4a-signal); padding: 0.05em 0.35em; border-radius: 4px; }
.agent-view figcaption { padding: 0.7rem 1rem 0.9rem; font-size: 0.82rem; color: #A6ABBD; border-top: 1px solid #262B45; }
.agent-view figcaption a { color: var(--s4a-signal); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.8rem 1.35rem; border-radius: 999px; border: 1px solid var(--border); color: var(--fg); text-decoration: none; font: 600 1rem var(--font-display); background: var(--surface); transition: transform .12s ease, box-shadow .15s ease; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px -10px color-mix(in srgb, var(--s4a-ink) 60%, transparent); }
.btn-primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn-primary::after { content: "→"; }

/* Steps, cards, FAQ */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 1.75rem 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr)); }
.steps li { counter-increment: step; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.35rem; position: relative; }
.steps li::before { content: "0" counter(step); display: block; font: 600 0.8rem var(--font-mono); color: var(--accent); margin-bottom: 0.9rem; letter-spacing: 0.06em; }
.steps li:nth-child(4) { border-color: color-mix(in srgb, var(--signal) 70%, var(--border)); box-shadow: inset 0 3px 0 var(--signal); }
.steps p, .card p, .faq-item p { margin: 0; color: var(--muted); }
.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); margin-top: 1.75rem; }
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; background: var(--surface); }
.card h3::before { content: ""; display: block; width: 1.6rem; height: 0.3rem; border-radius: 2px; background: var(--accent); margin-bottom: 1rem; }
.list { padding-left: 1.2rem; }
.list li { margin: 0.4rem 0; }
.list li::marker { color: var(--accent); }
.faq { display: grid; gap: 1.5rem 2rem; grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr)); }
.faq-item { border-top: 2px solid var(--border); padding-top: 1rem; }
.faq-item h3::before { content: "? "; color: var(--accent); font-family: var(--font-mono); }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); margin: 1.5rem 0; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { text-align: left; padding: 0.8rem 1rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); font: 600 0.85rem var(--font-display); text-transform: uppercase; letter-spacing: 0.05em; }
tr:last-child td { border-bottom: 0; }
td:first-child a, td:first-child { font-family: var(--font-mono); font-size: 0.88rem; }

.cta { text-align: center; }
.cta > p { margin-left: auto; margin-right: auto; }
.cta h2 { font-size: clamp(2rem, 4vw, 3rem); }
.small { font-size: 0.88rem; color: var(--muted); }
.more { font-weight: 600; text-decoration: none; font-family: var(--font-display); }

/* Brand page */
.figures { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); margin: 1.75rem 0; }
.logo-fig { margin: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.logo-stage { display: grid; place-items: center; min-height: 10rem; padding: 2rem; background: var(--s4a-paper); }
.logo-fig.on-dark .logo-stage { background: var(--s4a-ink); }
.logo-stage img { max-width: 100%; height: 56px; }
.logo-fig.small .logo-stage img { height: 96px; }
.logo-fig figcaption { padding: 0.75rem 1rem; font-size: 0.88rem; color: var(--muted); border-top: 1px solid var(--border); }
.swatches { list-style: none; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); margin: 1.75rem 0; }
.swatch { border: 1px solid var(--border); border-radius: var(--radius); padding: 0 0 1rem; background: var(--surface); overflow: hidden; line-height: 1.5; }
.swatch > *:not(.chip) { margin-left: 1rem; margin-right: 1rem; }
.swatch .small { display: block; margin-top: 0.4rem; }
.swatch code.var { background: none; padding: 0; color: var(--muted); }
.chip { display: block; height: 5.5rem; margin-bottom: 0.9rem; border-bottom: 1px solid var(--border); }
.chip-ink { background: var(--s4a-ink); } .chip-paper { background: var(--s4a-paper); } .chip-iris { background: var(--s4a-iris); }
.chip-iris-light { background: var(--s4a-iris-light); } .chip-signal { background: var(--s4a-signal); } .chip-slate { background: var(--s4a-slate); }
.chip-mist { background: var(--s4a-mist); } .chip-night { background: var(--s4a-night); }
.specimens { display: grid; gap: 1rem; margin: 1.75rem 0; }
.specimen { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; background: var(--surface); }
.spec-sample { font-size: clamp(1.4rem, 3.4vw, 2.4rem); line-height: 1.2; margin-bottom: 0.75rem; }
.spec-display .spec-sample { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.03em; }
.spec-body .spec-sample { font-family: var(--font-body); font-weight: 400; letter-spacing: -0.01em; }
.spec-mono .spec-sample { font-family: var(--font-mono); font-size: clamp(1.1rem, 2.6vw, 1.7rem); }
.specimen h3 { margin-bottom: 0.2rem; }

/* Search */
.search label { display: block; font-weight: 600; margin-bottom: 0.5rem; }
.search-row { display: flex; gap: 0.5rem; flex-wrap: wrap; max-width: 40rem; }
.search input { flex: 1 1 16rem; font: inherit; color: var(--fg); background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 0.75rem 1.15rem; }
.search input:focus { border-color: var(--accent); }
.results { list-style: none; padding: 0; display: grid; gap: 1.5rem; }
.results h2 { font-size: 1.25rem; margin-bottom: 0.2rem; }
.results p { margin: 0.2rem 0; max-width: 46rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 2.5rem 0; margin-top: 2rem; font-size: 0.92rem; color: var(--muted); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1.5rem 3rem; justify-content: space-between; align-items: flex-start; }
.footer-brand p { margin: 0.6rem 0 0; }
.footer-brand strong { color: var(--fg); font-family: var(--font-display); }
.footer-brand .wordmark { font-size: 1.15rem; }
.site-footer nav ul { flex-direction: column; gap: 0.35rem; font-family: var(--font-mono); font-size: 0.82rem; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--fg); }

@media (max-width: 56rem) {
  .hero-home { grid-template-columns: 1fr; gap: 2.5rem; }
}
@media (max-width: 40rem) {
  .header-inner { padding-top: 0.65rem; padding-bottom: 0.65rem; gap: 0.5rem 1rem; }
  .site-header nav { order: 3; width: 100%; margin-left: 0; }
  .agent-toggle { margin-left: auto; }
  .hero { padding: 3rem 0 3rem !important; }
  main > section { padding: 2.75rem 0; }
  .wordmark { font-size: 1.15rem; }
}