/* Founda Library — paper / ink / coral / acid system, mobile-first */

:root {
  --paper:     #F4F1EA;
  --paper-light: #FBF9F4;
  --paper-warm: #EAE4D5;
  --paper-soft: rgba(244, 241, 234, 0.55);
  --ink:       #0F0F0F;
  --ink-soft:  rgba(15, 15, 15, 0.55);
  --ink-faint: rgba(15, 15, 15, 0.16);
  --acid:      #DBFF4C;
  --coral:     #FF7A55;
  --border:    rgba(15, 15, 15, 0.10);
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Geist', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
body { min-height: 100vh; min-height: 100dvh; }
a { color: inherit; text-decoration: none; }
em.accent {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-weight: 400;
  color: var(--coral);
}

.shell {
  max-width: 720px;
  margin: 0 auto;
  padding: 36px 22px 56px;
}

/* Header */
.lib-header { margin-bottom: 36px; }
.lib-eyebrow {
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 14px;
}
.lib-title {
  font-family: 'Geist', sans-serif;
  font-weight: 700;
  font-size: 44px;
  line-height: 0.98;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}
.lib-subtitle {
  font-family: 'Geist', sans-serif;
  font-weight: 500;
  font-size: 16px;
  line-height: 1.45;
  color: var(--ink);
  max-width: 480px;
}

/* Item cards on index */
.lib-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
}
.lib-item {
  display: block;
  background: var(--paper-light);
  border: 1.5px solid var(--ink);
  border-radius: 14px;
  padding: 22px 22px 20px;
  transition: background 0.12s, transform 0.12s;
}
.lib-item:hover { background: var(--paper-warm); transform: translateY(-1px); }
.lib-item-kind {
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.lib-item-title {
  font-family: 'Geist', sans-serif;
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.lib-item-subtitle {
  font-family: 'Geist', sans-serif;
  font-weight: 500;
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.lib-item-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.lib-item-arrow {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 22px;
  color: var(--coral);
}

/* Item landing pages */
.item .lib-eyebrow { color: var(--coral); }
.item-title {
  font-family: 'Geist', sans-serif;
  font-weight: 700;
  font-size: 44px;
  line-height: 0.98;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.item-subtitle {
  font-family: 'Geist', sans-serif;
  font-weight: 500;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
  margin-bottom: 26px;
  max-width: 500px;
}
.item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.item-meta span {
  background: var(--paper-warm);
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  padding: 6px 12px;
  border-radius: 999px;
}
.item-section {
  margin-bottom: 26px;
}
.item-section-label {
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.item-audience {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 18px;
  line-height: 1.42;
  color: var(--ink);
  padding-left: 14px;
  border-left: 2px solid var(--coral);
}
.item-list {
  list-style: none;
  padding: 0;
}
.item-list li {
  font-family: 'Geist', sans-serif;
  font-weight: 500;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  padding-left: 18px;
  position: relative;
  margin-bottom: 8px;
}
.item-list li::before {
  content: '/';
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  color: var(--coral);
  position: absolute;
  left: 0;
}

/* CTAs */
.item-ctas {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 36px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.01em;
  padding: 16px 24px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  text-align: center;
  min-height: 56px;
  transition: background 0.12s, color 0.12s, transform 0.12s;
}
.btn:active { transform: scale(0.985); }
.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover { background: var(--coral); }
.btn-secondary {
  background: var(--paper-light);
  color: var(--ink);
  border: 1.5px solid var(--ink);
}
.btn-secondary:hover { background: var(--ink); color: var(--paper); }
.btn .arrow {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 22px;
}

/* Thesis line */
.thesis {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink-soft);
  padding-left: 14px;
  border-left: 2px solid var(--coral);
  margin-bottom: 28px;
}

/* Back link on item pages */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 28px;
}
.back-link:hover { color: var(--ink); }

/* Footer */
.lib-footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px dashed var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}
.wordmark {
  font-family: 'Geist', sans-serif;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.wordmark::after {
  content: '.';
  color: var(--coral);
  font-family: 'Instrument Serif', serif;
  font-style: italic;
}

@media (min-width: 700px) {
  .lib-title { font-size: 56px; }
  .item-title { font-size: 56px; }
  .item-ctas { flex-direction: row; }
  .btn { flex: 1; }
}