/*
 * Typography System
 * Font hierarchy, reading experience optimization
 */

/* ============================================
   BASE TYPOGRAPHY
   ============================================ */

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}


/* ============================================
   HEADINGS
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-normal);
  letter-spacing: -0.015em;
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-normal);
  letter-spacing: -0.01em;
}


/* ============================================
   BODY TEXT
   ============================================ */

p {
  margin-bottom: var(--space-md);
  max-width: 75ch; /* Optimal reading line length */
}

.section__paragraph {
  font-family: var(--font-secondary);
  font-size: var(--font-size-body);
  line-height: var(--line-height-loose);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.section__paragraph--large {
  font-size: 1.25rem;
  line-height: var(--line-height-relaxed);
}

.section__paragraph--small {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}


/* ============================================
   LINKS
   ============================================ */

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

a:focus {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.inline-link {
  color: var(--color-slate-blue);
  border-bottom: 1px solid var(--color-slate-blue);
  padding-bottom: 1px;
  transition: border-color var(--transition-fast);
}

.inline-link:hover {
  opacity: 1;
  border-bottom-color: transparent;
}


/* ============================================
   SPECIAL TEXT STYLES
   ============================================ */

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

em {
  font-style: italic;
}

.section__disclaimer {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin-top: var(--space-xl);
}


/* ============================================
   CAPTIONS
   ============================================ */

.diagram__caption,
.illustration__caption {
  font-family: var(--font-primary);
  font-size: var(--font-size-caption);
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--space-sm);
  font-style: italic;
}


/* ============================================
   RESPONSIVE TYPOGRAPHY
   ============================================ */

@media (max-width: 767px) {
  .section__paragraph {
    font-size: 1rem;
    line-height: 1.7;
  }
  
  .section__paragraph--large {
    font-size: 1.125rem;
  }
}