/* ==========================================================================
   DerekDiMatteo.com — Design Tokens & Core Theme Stylesheet
   Specification: Academic Editorial Humanities (docs/DESIGN.md & docs/BRAND_BOOK.md)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Surface & Canvas Ground */
  --color-surface: #faf9f6;                  /* Warm Archival Linen */
  --color-surface-dim: #dbdad7;
  --color-surface-bright: #faf9f6;
  --color-surface-card: #ffffff;            /* Elevated card surface */
  --color-surface-container: #efeeeb;
  --color-surface-container-high: #e9e8e5;
  --color-background: #faf9f6;

  /* Typography Inks */
  --color-on-surface: #1a1c1a;               /* Primary typography ink */
  --color-on-surface-variant: #44474b;       /* Muted secondary ink */
  --color-text-citation: #515c69;            /* Refereed journal / citation text */
  --color-text-metadata: #727f8d;            /* Captions, timestamps, DOIs */

  /* Inks & Brand Accents */
  --color-primary: #05101a;                  /* Deepest Ink */
  --color-primary-navy: #1a2530;             /* Deep Academic Slate Navy */
  --color-secondary: #3f6653;                /* Forest Sage Green */
  --color-secondary-dark: #2c5341;           /* Deep Forest Sage */
  --color-secondary-tint: #e8ede9;           /* Pale Sage tint for chips */
  --color-tertiary: #b85a3a;                 /* Warm Terracotta kiln accent */
  --color-tertiary-hover: #9e492e;           /* Darker rust */
  --color-tertiary-tint: #faeee9;            /* Terracotta tint */

  /* Borders & Dividers */
  --color-border-parchment: #e2dec9;         /* Archival parchment seam (1px) */
  --color-border-subtle: #ece8da;

  /* Focus Ring */
  --color-focus-ring: #2c5341;

  /* Typography Stacks */
  --font-serif: 'EB Garamond', Georgia, Garamond, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  /* Fluid Spacing Scale */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;

  /* Corner Radius */
  --radius-xs: 0.125rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;

  /* Max Widths */
  --max-width: 1200px;
  --measure-prose: 68ch;

  /* Shadows (Subtle, warm diffusion) */
  --shadow-subtle: 0 4px 20px -2px rgba(26, 37, 48, 0.05), 0 2px 6px -1px rgba(26, 37, 48, 0.03);
}

/* Base Reset & Document Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-background);
  color: var(--color-on-surface);
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  background-color: var(--color-background);
  color: var(--color-on-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility Focus Invariant */
:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
}

/* Reduced Motion Override */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -999px;
  left: 1rem;
  background: var(--color-primary-navy);
  color: #ffffff;
  padding: 0.5rem 1rem;
  z-index: 1000;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
}
.skip-link:focus {
  top: 1rem;
}

/* Typography Utility Hierarchy */
h1, h2, h3, h4, .serif-heading {
  font-family: var(--font-serif);
  font-weight: normal;
  color: var(--color-primary-navy);
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h2 {
  font-size: 1.875rem;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.375rem;
  line-height: 1.4;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-on-surface);
}

p.lead {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-on-surface-variant);
}

a {
  color: var(--color-primary-navy);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 120ms ease;
}
a:hover {
  color: var(--color-tertiary);
}

/* Global Navigation & Header */
.site-header {
  border-bottom: 1px solid var(--color-border-parchment);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand-lockup {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary-navy);
  text-decoration: none;
}

.brand-subtitle {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-secondary-dark);
  font-weight: 600;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary-navy);
  padding: 0.25rem 0;
  position: relative;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-tertiary);
}

.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-tertiary);
}

/* Layout Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Hero Section */
.hero {
  padding: var(--space-2xl) 0 var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border-parchment);
}

.hero-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-portrait-frame {
  border: 1px solid var(--color-border-parchment);
  padding: 0.5rem;
  background: #ffffff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-subtle);
  display: inline-block;
}

.hero-portrait {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-xs);
  object-fit: cover;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: 2.75rem;
  line-height: 1.2;
  color: var(--color-primary-navy);
  margin-bottom: var(--space-md);
  letter-spacing: -0.015em;
}

.hero-roles {
  display: inline-flex;
  gap: 0.75rem;
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

/* Badges & Chips */
.badge {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.badge-sage {
  background: var(--color-secondary-tint);
  color: var(--color-secondary-dark);
  border: 1px solid #cad6ce;
}

.badge-terracotta {
  background: var(--color-tertiary-tint);
  color: var(--color-tertiary);
  border: 1px solid #edd5cb;
}

.badge-slate {
  background: #efeeeb;
  color: var(--color-primary-navy);
  border: 1px solid var(--color-border-parchment);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 120ms ease;
  line-height: 1.2;
}

.btn-primary {
  background: var(--color-primary-navy);
  color: #ffffff;
  border: 1px solid var(--color-primary-navy);
}
.btn-primary:hover {
  background: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
  color: #ffffff;
}

.btn-accent {
  background: var(--color-tertiary);
  color: #ffffff;
  border: 1px solid var(--color-tertiary);
}
.btn-accent:hover {
  background: var(--color-tertiary-hover);
  border-color: var(--color-tertiary-hover);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary-navy);
  border: 1px solid var(--color-primary-navy);
}
.btn-outline:hover {
  background: #f0ede4;
  color: var(--color-primary-navy);
}

/* Three Pillars Section */
.section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-border-parchment);
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-pretitle {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--color-secondary-dark);
  margin-bottom: 0.25rem;
  display: block;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-parchment);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
}

.card-feature {
  border-top: 3px solid var(--color-secondary-dark);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-primary-navy);
  margin-bottom: var(--space-xs);
}

.card-body {
  color: var(--color-on-surface-variant);
  font-size: 0.9375rem;
  flex-grow: 1;
  margin-bottom: var(--space-md);
}

/* Monograph Feature Spotlight */
.monograph-spotlight {
  background: #ffffff;
  border: 1px solid var(--color-border-parchment);
  border-radius: var(--radius-sm);
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2.5rem;
  box-shadow: var(--shadow-subtle);
  align-items: center;
  margin: var(--space-xl) 0;
}

.book-cover-img {
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border-parchment);
  box-shadow: 0 8px 24px -4px rgba(26, 37, 48, 0.15);
  border-radius: var(--radius-xs);
  display: block;
}

.monograph-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--color-text-citation);
  margin-bottom: var(--space-sm);
}

/* Editorial Blockquote */
blockquote.editorial-quote {
  border-left: 2px solid var(--color-tertiary);
  padding-left: 1.25rem;
  margin: var(--space-lg) 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--color-primary-navy);
}

/* Marginalia / Footnote */
.marginalia {
  font-size: 0.8125rem;
  color: var(--color-text-citation);
  border-left: 1px solid var(--color-border-parchment);
  padding-left: 0.75rem;
  margin: 1rem 0;
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-parchment);
  padding: 3rem 0;
  font-size: 0.875rem;
  color: var(--color-text-metadata);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-heading {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-navy);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--color-on-surface-variant);
}

.footer-links a:hover {
  color: var(--color-tertiary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-parchment);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: left;
    gap: 1.5rem;
  }
  .hero-portrait-frame {
    max-width: 200px;
  }
  .pillars-grid {
    grid-template-columns: 1fr;
  }
  .monograph-spotlight {
    grid-template-columns: 1fr;
  }
  .book-cover-img {
    max-width: 200px;
    margin: 0 auto;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}