/* base.css — palette, typography, layout, and shared editorial primitives.
 *
 * This file carries everything cross-cutting across Janus site pages.
 * Page-specific styles (rings-diagram, strata, faces, body-diagram,
 * coalition-diagram, etc.) live inline on the page that owns them.
 */

:root {
  --bg: #f3ede2;
  --bg-deep: #ede6d6;
  --bg-dark: #1a1815;
  --bg-dark-soft: #232019;
  --ink: #1a1612;
  --ink-soft: #5b544a;
  --ink-mute: #8a8275;
  --ink-on-dark: #ece5d4;
  --ink-on-dark-soft: #a59c8a;
  --rule: #d6cdb8;
  --rule-dark: #3a352c;
  --accent: #b9531c;
  --accent-soft: #d2956b;
  --serif: 'Fraunces', 'Iowan Old Style', 'Source Serif Pro', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --measure: 40rem;
  --measure-hero: 50rem;
  --measure-wide: 62rem;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--accent); color: var(--bg); }

/* Branded-noun keywords — LinkedIn, Microsoft, Microsoft 365, GitHub,
   Azure, Project Aura, digital workers, etc. Bold accent so corporate
   sponsor names jump off the page. No underline (avoids hyperlink
   confusion); works alongside <em> when the word is also being
   italicized for editorial reasons. */
.kw {
  font-weight: 600;
  color: var(--accent);
}
.on-dark .kw {
  color: var(--accent-soft);
}
@media print {
  .kw { color: #b9531c; }
}

/* ----------------- layout ----------------- */

main { display: block; }
section { padding: 7rem 2rem; position: relative; }
section.tight { padding: 4rem 2rem; }
section.tall { padding: 11rem 2rem; }

.col { max-width: var(--measure); margin: 0 auto; }
.col-wide { max-width: var(--measure-wide); margin: 0 auto; }

.label {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
  margin: 0 0 2.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.9rem;
}
.label::before {
  content: "";
  width: 1.6rem; height: 1px; background: currentColor;
  display: inline-block;
}
.label.center { justify-content: center; }
.label.center::before { display: none; }
.label.center::after {
  content: "";
  width: 1.6rem; height: 1px; background: currentColor;
  display: inline-block;
  margin-left: 0.9rem;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-style: normal;
  margin: 0;
  letter-spacing: -0.015em;
  line-height: 1.1;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
h1 { font-size: clamp(2.4rem, 5.5vw, 4.4rem); }
h2 { font-size: clamp(2rem, 4vw, 3.2rem); margin-bottom: 1.8rem; }
h3 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); margin-bottom: 1rem; }

p { margin: 0 0 1.4em 0; }
p:last-child { margin-bottom: 0; }
em { font-style: italic; color: var(--ink); }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .2s; }
a:hover { border-bottom-color: var(--accent); }

hr { border: none; height: 1px; background: var(--rule); margin: 4rem auto; max-width: 4rem; }
.on-dark hr { background: var(--rule-dark); }

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

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 2rem 6rem;
}
.hero .col { max-width: var(--measure-hero); }
.hero .kicker {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 5rem;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  line-height: 1.05;
  margin-bottom: 2.2rem;
  font-variation-settings: "opsz" 144, "SOFT" 50, "WONK" 0;
}
.hero .turn {
  font-style: italic;
  color: var(--accent);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.35;
  margin-top: 2rem;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.hero .scroll-cue {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-mute);
  opacity: 0.7;
}
.hero .scroll-cue::after {
  content: "";
  display: block;
  width: 1px;
  height: 2.5rem;
  background: currentColor;
  margin: 0.8rem auto 0;
  animation: drift 2.4s ease-in-out infinite;
}
@keyframes drift {
  0%, 100% { transform: scaleY(0.4); transform-origin: top; opacity: 0.4; }
  50% { transform: scaleY(1); transform-origin: top; opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .hero .scroll-cue::after { animation: none; opacity: 0.5; }
}

/* ----------------- vignette ----------------- */

.vignette {
  margin: 3.5rem auto;
  padding: 2.4rem 2.6rem;
  background: var(--bg-deep);
  border-left: 2px solid var(--accent);
  font-style: italic;
  font-size: 1.05em;
  line-height: 1.55;
  color: var(--ink);
  max-width: var(--measure);
}
.vignette p { margin-bottom: 1em; }
.vignette .attrib {
  font-style: normal;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-top: 1.2rem;
}

/* ----------------- message bubble ----------------- */

.message {
  max-width: 28rem;
  margin: 2.5rem auto;
  padding: 1.6rem 1.8rem;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 14px 14px 14px 4px;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(0,0,0,0.02), 0 12px 30px -20px rgba(0,0,0,0.15);
  position: relative;
}
.message::before {
  content: "Janus";
  position: absolute;
  top: -1.6rem; left: 0;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.on-dark .message {
  background: var(--bg-dark-soft);
  border-color: var(--rule-dark);
  color: var(--ink-on-dark);
}

/* ----------------- dark sections ----------------- */

.dark { background: var(--bg-dark); color: var(--ink-on-dark); }
.dark h1, .dark h2, .dark h3 { color: var(--ink-on-dark); }
.dark .label { color: var(--ink-on-dark-soft); }
.dark p { color: var(--ink-on-dark); }
.dark em { color: var(--accent-soft); }
.dark .vignette {
  background: var(--bg-dark-soft);
  color: var(--ink-on-dark);
  border-left-color: var(--accent);
}
.dark .vignette .attrib { color: var(--ink-on-dark-soft); }

/* ----------------- axes grid ----------------- */

.axes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 3rem auto 0;
  max-width: var(--measure-wide);
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}
@media (max-width: 800px) { .axes { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .axes { grid-template-columns: 1fr; } }
.axes .axis {
  padding: 1.8rem 1.6rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.axes .axis .n {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  display: block;
}
.axes .axis .name {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-style: italic;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
}
.axes .axis .gloss {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
  line-height: 1.5;
}

/* ----------------- close section ----------------- */

.close { text-align: center; padding: 12rem 2rem 8rem; }
.close h2 {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  margin-bottom: 2rem;
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 80;
}
.close .small {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
  margin-top: 4rem;
}
.close .glyph { font-size: 1.8rem; margin-top: 3rem; opacity: 0.6; }

/* ----------------- site nav ----------------- */

.site-nav {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 1.6rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 237, 226, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
}
.site-nav .brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  border: none;
  font-weight: 600;
}
.site-nav .brand img { width: 22px; height: 22px; display: block; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 1.6rem; }
.site-nav a { color: var(--ink-soft); border: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--accent); }

@media (max-width: 600px) {
  .site-nav { flex-direction: column; gap: 1rem; align-items: flex-start; }
  .site-nav ul { flex-wrap: wrap; gap: 1rem; }
}

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

.site-footer {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  padding: 3rem 2rem;
  border-top: 1px solid var(--rule);
  text-align: center;
}
.site-footer .authorship {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--ink-soft);
  margin-bottom: 0.6rem;
  font-style: normal;
}
.site-footer .authorship em { font-style: italic; }
.site-footer a { color: var(--ink-soft); border: none; }
.site-footer a:hover { color: var(--accent); }

/* ----------------- small-screen tuning ----------------- */

@media (max-width: 600px) {
  section { padding: 5rem 1.5rem; }
  .hero { padding: 3rem 1.5rem 5rem; }
  body { font-size: 18px; }
}