/* ============================================
   Base Typography & Body Styles
   ============================================ */

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  color: var(--color-text-body);
  background-color: var(--color-bg-primary);
  line-height: var(--lh-normal);
}

/* ── Headings ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text-heading);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
}

h1 {
  font-size: var(--fs-5xl);
  font-weight: var(--fw-bold);
}

h2 {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-bold);
}

h3 {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
}

h4 {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
}

h5 {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
}

h6 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
}

/* ── Body Text ── */
p {
  margin-bottom: var(--space-4);
  color: var(--color-text-body);
}

p:last-child {
  margin-bottom: 0;
}

strong, b {
  font-weight: var(--fw-semibold);
}

small {
  font-size: var(--fs-sm);
}

/* ── Links ── */
a {
  transition: color var(--transition-fast);
}

.link {
  color: var(--color-primary);
  font-weight: var(--fw-medium);
  position: relative;
}

.link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.link:hover::after {
  width: 100%;
}

/* ── Code / Mono ── */
code, .mono {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  background: var(--color-bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

/* ── Section Titles ── */
.section-label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-widest);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  display: block;
}

.section-title {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-heading);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: var(--lh-relaxed);
}

/* ── Dividers ── */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* ── Selection ── */
mark {
  background: var(--color-forest-100);
  color: var(--color-forest-800);
  padding: 0.1em 0.3em;
  border-radius: var(--radius-sm);
}

/* ── Utility: Text ── */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-heading { color: var(--color-text-heading); }
.text-white { color: var(--color-text-inverse); }

/* ── Utility: Display ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ── Animations: Fade In on Scroll ── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }
.animate-on-scroll.delay-4 { transition-delay: 0.4s; }