/* The Heart Is the Fuel — design system
   Direction: "Saint-Exupéry's night-flight manual, fine-press edition" */

@font-face {
  font-family: 'Fraunces';
  src: url('fonts/fraunces-var.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Fraunces';
  src: url('fonts/fraunces-var-italic.woff2') format('woff2');
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'Geist Mono';
  src: url('fonts/geist-mono.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}

:root {
  --night: #0d0a06;
  --night-raised: #171208;
  --paper: #f2ead9;
  --paper-dim: #e6dcc6;
  --ink: #1a140c;
  --ink-soft: #5c4e38;
  --gold: #c8a86a;
  --gold-dim: #94805a;
  --gold-line: #2a2113;
  --ember: #e0662c;
  --ember-bright: #f0a03c;
  --sky-dim: #a89878;
  --serif: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--night);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--gold); }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.reading { max-width: 46rem; margin: 0 auto; padding: 0 24px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--gold);
  text-transform: uppercase;
}
.eyebrow--ink { color: #8a6a2c; }

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-decoration: none;
  padding: 15px 30px;
  border-radius: 3px;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.btn--solid { background: var(--gold); color: var(--night); }
.btn--solid:hover { background: var(--ember-bright); transform: translateY(-1px); }
.btn--ghost { border: 1px solid var(--gold-dim); color: var(--gold); }
.btn--ghost:hover { border-color: var(--gold); transform: translateY(-1px); }

.rule { border: 0; border-top: 1px solid var(--gold-line); }

/* fine-press plate frame */
.plate {
  border: 1px solid var(--gold-line);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,.55);
  position: relative;
}
.plate::after {
  content: '';
  position: absolute; inset: 10px;
  border: 1px solid rgba(200,168,106,.22);
  border-radius: 3px;
  pointer-events: none;
}
.plate-caption {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--gold-dim);
  text-transform: uppercase;
  text-align: center;
  margin-top: 14px;
}

/* paper (cream) sections */
.paper-section { background: var(--paper); color: var(--ink); }
.paper-section .eyebrow { color: #8a6a2c; }

::selection { background: var(--ember); color: var(--night); }

/* reading pages (paper + book) */
.doc-body { background: var(--paper); color: var(--ink); }
.doc-body .reading p {
  margin: 0 0 1.35em;
  font-size: 19px;
  line-height: 1.72;
}
.doc-body .reading p + p { text-indent: 0; }
.doc-body h1, .doc-body h2, .doc-body h3 { font-weight: 560; line-height: 1.18; }
.doc-body .reading h2 {
  font-size: 34px;
  margin: 2.6em 0 .9em;
}
.doc-body .reading h3 { font-size: 24px; margin: 2em 0 .7em; }
.doc-body .reading blockquote {
  margin: 2em 0;
  padding-left: 1.4em;
  border-left: 2px solid var(--gold);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 20px;
}
.doc-body .reading em { font-style: italic; }
.doc-body .reading .sec-label {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: #8a6a2c;
  text-transform: uppercase;
  margin: 4.2em 0 .6em;
}
.doc-body .reading h2 + .sec-label { margin-top: 0; }
.footnotes { font-size: 15px; color: var(--ink-soft); }

/* top nav for doc pages */
.docnav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,10,6,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gold-line);
}
.docnav-inner {
  max-width: 1160px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.docnav a { text-decoration: none; }
.docnav .brand {
  font-family: var(--mono); font-size: 12px; letter-spacing: .22em;
  color: var(--gold); text-transform: uppercase;
}
.docnav .links { display: flex; gap: 22px; }
.docnav .links a {
  font-family: var(--mono); font-size: 12px; letter-spacing: .16em;
  color: var(--sky-dim); text-transform: uppercase;
}
.docnav .links a:hover, .docnav .links a.active { color: var(--paper); }

@media (max-width: 720px) {
  body { font-size: 17px; }
  .doc-body .reading p { font-size: 17px; }
  .eyebrow { font-size: 10px; letter-spacing: 0.2em; }
}