/* ===================================================================
   Nous — pure mind, pure web
   Typography: Marcellus (inscriptional roman display) · Manrope (body)
   Palette: near-black ground, paper-white text, one muted bronze accent
   =================================================================== */

:root {
  --ground: oklch(0.16 0.005 80);           /* deep ink */
  --ground-soft: oklch(0.2 0.006 80);       /* raised surface */
  --rule: oklch(0.3 0.008 80);              /* subtle borders */
  --rule-strong: oklch(0.4 0.008 80);

  --paper: oklch(0.96 0.008 85);            /* warm paper-white */
  --paper-muted: oklch(0.75 0.01 80);       /* secondary text */
  --paper-faint: oklch(0.55 0.008 80);      /* captions */

  --accent: oklch(0.72 0.1 70);             /* muted bronze */
  --accent-soft: oklch(0.82 0.07 70);

  --code-ground: oklch(0.12 0.005 80);
  --code-key: oklch(0.78 0.05 70);          /* conf keys */
  --code-val: oklch(0.85 0.01 80);          /* conf values */

  --radius: 4px;
  --radius-lg: 8px;

  --font-display: "Marcellus", "Marcellus Fallback", "Cormorant Garamond", Georgia, serif;
  --font-body: "Manrope", "Manrope Fallback", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  color: var(--paper);
  background: var(--ground);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "kern" 1, "liga" 1;
  text-rendering: optimizeLegibility;
}

.wrap {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 3vw, 2.5rem);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ===================
   Typography
   =================== */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--paper);
  letter-spacing: 0;
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.6rem, 2vw + 0.9rem, 2.3rem);
  margin-bottom: 0.5em;
}

h3 {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-faint);
  margin-bottom: 1rem;
}

p { color: var(--paper); }

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in oklch, var(--accent) 35%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
a:hover { color: var(--accent-soft); text-decoration-color: currentColor; }

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--paper-faint);
  margin-bottom: 1.25rem;
}

code, kbd, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

:not(pre) > code {
  background: var(--ground-soft);
  color: var(--paper);
  padding: 0.08em 0.4em;
  border-radius: 3px;
  font-size: 0.86em;
  border: 1px solid var(--rule);
}

/* ===================
   Header / Nav
   =================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklch, var(--ground) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--rule);
}

.site-header .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  gap: 1.5rem;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--paper);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
}
.wordmark-latin { letter-spacing: 0.04em; }
.wordmark-greek {
  font-size: 0.95rem;
  color: var(--accent);
  opacity: 0.85;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.88rem;
}
.site-nav a {
  color: var(--paper-muted);
  text-decoration: none;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}
.site-nav a:hover { color: var(--paper); }

.site-nav .ghost-btn {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  color: var(--paper);
  transition: background 0.2s ease, border-color 0.2s ease;
}
.site-nav .ghost-btn:hover {
  background: var(--ground-soft);
  border-color: var(--paper);
  color: var(--paper);
}

@media (max-width: 620px) {
  .site-nav a:not(.ghost-btn) { display: none; }
}

/* ===================
   Hero
   =================== */
.hero {
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(3rem, 6vw, 5rem);
  text-align: center;
}

.hero-wrap { max-width: 720px; }

.wordmark-display {
  margin: 0 0 1.25rem;
  line-height: 1;
}

.greek-caps {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 7.5rem);
  letter-spacing: 0.08em;
  color: var(--paper);
  line-height: 1;
  display: inline-block;
}

.hero .tagline {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1.6vw + 0.9rem, 1.9rem);
  color: var(--paper);
  letter-spacing: 0.015em;
  line-height: 1.3;
  margin-bottom: 1.5rem;
}

.hero .subtagline {
  max-width: 52ch;
  margin: 0 auto 2.25rem;
  color: var(--paper-muted);
  font-size: 1.02rem;
  line-height: 1.65;
}

.cta-row {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  letter-spacing: 0.02em;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.05s ease;
}
.btn:active { transform: translateY(1px); }

.btn.primary {
  background: var(--paper);
  color: var(--ground);
}
.btn.primary:hover {
  background: color-mix(in oklch, var(--paper) 85%, var(--accent) 30%);
  color: var(--ground);
  text-decoration: none;
}

.btn.ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--rule-strong);
}
.btn.ghost:hover {
  border-color: var(--paper);
  background: var(--ground-soft);
  color: var(--paper);
  text-decoration: none;
}

.release-note {
  margin-top: 1.35rem;
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--paper-muted);
}
.release-note a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.release-note a:hover { color: var(--accent-soft); text-decoration: underline; text-decoration-color: currentColor; }
.release-note span[aria-hidden="true"] { color: var(--paper-faint); }

.system-note {
  margin-top: 0.55rem;
  font-size: 0.8rem;
  color: var(--paper-faint);
  letter-spacing: 0.02em;
}

.hero-visual {
  margin-top: clamp(3rem, 6vw, 5rem);
  max-width: 1100px;
}
.hero-visual img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  box-shadow: 0 40px 80px -32px rgba(0, 0, 0, 0.75);
}

/* ===================
   Sections
   =================== */
section { padding: clamp(3rem, 6vw, 5rem) 0; border-top: 1px solid var(--rule); }

/* Essence */
.essence-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}
.essence-col h2 { margin-bottom: 0; }
.essence-body {
  font-size: 1.02rem;
  color: var(--paper);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}
.essence-specs {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 0.5rem 1.25rem;
  font-size: 0.92rem;
  line-height: 1.55;
}
.essence-specs div { display: contents; }
.essence-specs dt {
  font-family: var(--font-body);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper-faint);
  padding-top: 3px;
}
.essence-specs dd { color: var(--paper); }
@media (max-width: 760px) {
  .essence-grid { grid-template-columns: 1fr; }
  .essence-specs { grid-template-columns: 100px 1fr; }
}

/* Keys */
.keys-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(1.5rem, 3vw, 3rem);
  margin-top: 2.25rem;
}
@media (max-width: 760px) { .keys-grid { grid-template-columns: 1fr; } }

.key-table { border-top: 1px solid var(--rule); padding-top: 1.25rem; }
.key-table table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.key-table tr + tr td { border-top: 1px solid color-mix(in oklch, var(--rule) 70%, transparent); }
.key-table td {
  padding: 0.65rem 0;
  vertical-align: top;
}
.key-table td:first-child { width: 44%; color: var(--paper); font-family: var(--font-mono); font-size: 0.85rem; }
.key-table td:last-child { color: var(--paper-muted); }

kbd {
  display: inline-block;
  padding: 0.12em 0.42em;
  background: var(--ground-soft);
  border: 1px solid var(--rule-strong);
  border-bottom-width: 2px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.78em;
  color: var(--paper);
}

/* Config */
.config-lede { font-size: 1.02rem; color: var(--paper-muted); margin: 0.5rem 0 1.75rem; max-width: 60ch; line-height: 1.65; }
.config-aside { font-size: 0.92rem; color: var(--paper-muted); margin: 1.5rem 0 0.5rem; }

.code-block {
  background: var(--code-ground);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.4rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.7;
}
.code-block code { color: var(--paper); font-family: var(--font-mono); }
.code-wrap code { white-space: pre-wrap; word-break: break-all; }
.tok-key { color: var(--code-key); }
.tok-val { color: var(--code-val); }

.config-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 2rem;
  font-size: 0.92rem;
}
.config-table th {
  text-align: left;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper-faint);
  padding: 0.75rem 1rem 0.75rem 0;
  border-bottom: 1px solid var(--rule-strong);
}
.config-table td {
  padding: 0.7rem 1rem 0.7rem 0;
  border-bottom: 1px solid color-mix(in oklch, var(--rule) 70%, transparent);
  color: var(--paper);
  vertical-align: top;
}
.config-table td:first-child { color: var(--accent); font-family: var(--font-mono); font-size: 0.88rem; width: 25%; }
.config-table td:nth-child(2) { color: var(--paper-muted); width: 20%; }
.config-table td:last-child { color: var(--paper-muted); }

/* Philosophy */
.philosophy { padding: clamp(3.5rem, 7vw, 6rem) 0; text-align: center; }
.philosophy blockquote {
  border: 0;
  padding: 0;
  margin: 0;
}
.philosophy .greek {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 9vw, 6rem);
  color: var(--paper);
  line-height: 1;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}
.philosophy .body {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 0.8vw + 0.9rem, 1.35rem);
  color: var(--paper-muted);
  max-width: 44ch;
  margin: 0 auto;
  line-height: 1.55;
  font-style: italic;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0 3rem;
  background: var(--ground);
}
.footer-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: baseline;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--paper-muted);
}
.footer-brand { max-width: 56ch; }
.footer-mark {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--accent);
  margin-right: 0.35rem;
  letter-spacing: 0.03em;
}
.footer-wrap a {
  color: var(--paper);
  text-decoration: none;
}
.footer-wrap a:hover {
  color: var(--accent-soft);
  text-decoration: underline;
  text-decoration-color: currentColor;
}
.footer-links span { color: var(--paper-faint); margin: 0 0.35rem; }