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

:root {
  --color-bg: #faf9f7;
  --color-bg-alt: #f0efe9;
  --color-text: #1a1a2e;
  --color-text-muted: #555;
  --color-primary: #2d4a6f;
  --color-primary-light: #4a7cba;
  --color-accent: #8b5e3c;
  --color-border: #ddd;
  --color-seed-bg: #fff8e1;
  --color-seed-border: #f9a825;
  --color-green-bg: #e8f5e9;
  --max-width: 1200px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-light); text-decoration: underline; }

img { max-width: 100%; height: auto; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }

/* === Navigation === */
.nav { background: #fff; border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; }
.nav__inner { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); display: flex; align-items: center; height: 64px; gap: var(--space-lg); }
.nav__logo { font-family: var(--font-serif); font-size: 1.25rem; font-weight: 700; color: var(--color-text); text-decoration: none; }
.nav__logo-pl { color: var(--color-accent); }
.nav__links { list-style: none; display: flex; gap: var(--space-sm); align-items: center; }
.nav__links a { padding: var(--space-sm) var(--space-md); border-radius: 6px; font-size: 0.9rem; color: var(--color-text); text-decoration: none; }
.nav__links a:hover { background: var(--color-bg-alt); }
.nav__link--active { background: var(--color-bg-alt); font-weight: 600; }
.nav__dropdown { position: relative; }
.nav__dropdown-menu { display: none; position: absolute; top: 100%; left: 0; background: #fff; border: 1px solid var(--color-border); border-radius: 8px; padding: var(--space-sm); min-width: 220px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.nav__dropdown:hover .nav__dropdown-menu { display: block; }
.nav__dropdown-menu a { display: block; padding: var(--space-sm) var(--space-md); white-space: nowrap; }
.nav__search { margin-left: auto; }
.nav__search input { padding: var(--space-sm) var(--space-md); border: 1px solid var(--color-border); border-radius: 20px; font-size: 0.875rem; width: 200px; transition: width 0.2s; }
.nav__search input:focus { width: 280px; outline: none; border-color: var(--color-primary); }
.nav__toggle { display: none; background: none; border: none; cursor: pointer; padding: var(--space-sm); }
.nav__overlay { display: none; }
@media (max-width: 768px) {
  .nav__inner { gap: var(--space-sm); }
  .nav__links { display: none; position: fixed; top: 64px; left: 0; right: 0; bottom: 0; background: #fff; flex-direction: column; padding: var(--space-lg); overflow-y: auto; z-index: 99; }
  .nav__links--open { display: flex; }
  .nav__toggle { display: flex; flex-direction: column; gap: 4px; }
  .nav__toggle span { width: 24px; height: 2px; background: var(--color-text); transition: 0.2s; }
  .nav__toggle--open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
  .nav__toggle--open span:nth-child(2) { opacity: 0; }
  .nav__toggle--open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }
  .nav__overlay--visible { display: block; position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 98; }
  .nav__search input { width: 140px; }
  .nav__search input:focus { width: 200px; }
  .nav__dropdown-menu { position: static; box-shadow: none; border: none; padding-left: var(--space-lg); }
  .nav__dropdown:hover .nav__dropdown-menu { display: none; }
  .nav__dropdown-menu--open { display: block !important; }
}

/* === Hero === */
.hero { background: linear-gradient(135deg, #1a1a2e 0%, #2d4a6f 50%, #4a7cba 100%); color: #fff; padding: var(--space-xl) var(--space-md); text-align: center; }
.hero__inner { max-width: 800px; margin: 0 auto; }
.hero h1 { font-family: var(--font-serif); font-size: 2.5rem; margin-bottom: var(--space-md); line-height: 1.3; }
.hero p { font-size: 1.15rem; line-height: 1.7; margin-bottom: var(--space-lg); opacity: 0.9; }
.hero-search { display: flex; max-width: 500px; margin: 0 auto; gap: var(--space-sm); }
.hero-search input { flex: 1; padding: var(--space-md); border: none; border-radius: 8px; font-size: 1rem; }
.hero-stats { display: flex; justify-content: center; gap: var(--space-xl); margin-top: var(--space-lg); }
.hero-stat { text-align: center; }
.hero-stat__number { font-size: 1.75rem; font-weight: 700; display: block; }
.hero-stat__label { font-size: 0.85rem; opacity: 0.8; }
@media (max-width: 768px) { .hero h1 { font-size: 1.75rem; } .hero-stats { gap: var(--space-lg); } }

/* === Section === */
.section { padding: var(--space-xl) var(--space-md); }
.section__inner { max-width: var(--max-width); margin: 0 auto; }
.section__title { font-family: var(--font-serif); font-size: 1.75rem; margin-bottom: var(--space-lg); text-align: center; }

/* === Domain Grid (Home) === */
.domain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.domain-card { background: #fff; border: 1px solid var(--color-border); border-radius: 12px; padding: var(--space-lg); text-align: center; transition: transform 0.15s, box-shadow 0.15s; }
.domain-card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.domain-card__icon { font-size: 2rem; margin-bottom: var(--space-sm); }
.domain-card h3 { font-family: var(--font-serif); margin-bottom: var(--space-sm); }
.domain-card p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.5; }
.domain-card__count { display: inline-block; margin-top: var(--space-sm); font-size: 0.8rem; color: var(--color-primary); font-weight: 600; }
@media (max-width: 768px) { .domain-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .domain-grid { grid-template-columns: 1fr; } }

/* === Feature row === */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin-top: var(--space-lg); }
.feature-card { background: #fff; border: 1px solid var(--color-border); border-radius: 12px; padding: var(--space-lg); }
.feature-card h3 { font-family: var(--font-serif); margin-bottom: var(--space-md); padding-bottom: var(--space-sm); border-bottom: 2px solid var(--color-border); }

/* === Footer === */
.footer { background: var(--color-text); color: #ccc; padding: var(--space-xl) var(--space-md) var(--space-md); margin-top: var(--space-xl); }
.footer__inner { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-lg); }
.footer h4 { color: #fff; margin-bottom: var(--space-sm); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer p { font-size: 0.875rem; line-height: 1.6; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: var(--space-xs); }
.footer a { color: #aaa; font-size: 0.875rem; }
.footer a:hover { color: #fff; }
.footer__bottom { max-width: var(--max-width); margin: var(--space-lg) auto 0; padding-top: var(--space-md); border-top: 1px solid #444; font-size: 0.8rem; text-align: center; }
@media (max-width: 768px) { .footer__inner { grid-template-columns: 1fr 1fr; } .feature-row { grid-template-columns: 1fr; } }
@media (max-width: 480px) { .footer__inner { grid-template-columns: 1fr; } }

/* === Entry Card (library) === */
.entry-card { background: #fff; border: 1px solid var(--color-border); border-radius: 8px; padding: var(--space-md); transition: box-shadow 0.15s; }
.entry-card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.entry-card__header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-sm); font-size: 0.8rem; }
.entry-card__domain { color: var(--color-primary-light); font-weight: 600; text-transform: uppercase; font-size: 0.75rem; letter-spacing: 0.05em; }
.entry-card__title { font-family: var(--font-serif); font-size: 1rem; margin-bottom: var(--space-xs); }
.entry-card__title a { color: var(--color-text); }
.entry-card__author { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: var(--space-sm); }
.entry-card__summary { font-size: 0.875rem; line-height: 1.5; color: var(--color-text-muted); }
.entry-card__footer { margin-top: var(--space-sm); display: flex; gap: var(--space-xs); flex-wrap: wrap; }

/* === Tag === */
.tag { display: inline-block; padding: 2px 8px; background: var(--color-bg-alt); border-radius: 4px; font-size: 0.75rem; color: var(--color-text-muted); }

/* === Access Badge === */
.access-badge { display: inline-flex; align-items: center; gap: 4px; padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
.access-badge--public-domain { background: #e3f2e7; color: #2e7d32; }
.access-badge--open-access { background: #e3f2fd; color: #1565c0; }
.access-badge--copyrighted { background: #fce4ec; color: #c62828; }

/* === Seed Banner === */
.seed-banner { padding: var(--space-md); border-radius: 8px; margin-bottom: var(--space-lg); font-size: 0.9rem; }
.seed-banner--seed { background: var(--color-seed-bg); border: 1px solid var(--color-seed-border); }
.seed-banner--reviewed { background: var(--color-green-bg); border: 1px solid #66bb6a; }

/* === Page Header === */
.page-header { background: var(--color-bg-alt); padding: var(--space-lg) var(--space-md); border-bottom: 1px solid var(--color-border); }
.page-header__inner { max-width: var(--max-width); margin: 0 auto; }
.page-header h1 { font-family: var(--font-serif); font-size: 2rem; margin-bottom: var(--space-sm); }
.page-header p { color: var(--color-text-muted); max-width: 650px; }
.page-header .breadcrumb { font-size: 0.8rem; color: var(--color-text-muted); margin-bottom: var(--space-sm); }
.page-header .breadcrumb a { color: var(--color-text-muted); }
.page-header .breadcrumb a:hover { color: var(--color-primary); }

/* === Library Entry Detail === */
.library-entry { max-width: var(--max-width); margin: 0 auto; padding: var(--space-lg) var(--space-md); display: grid; grid-template-columns: 2fr 1fr; gap: var(--space-lg); }
.library-entry__main { }
.library-entry__meta { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-md); font-size: 0.875rem; }
.library-entry__meta-item { padding: var(--space-xs) var(--space-sm); background: var(--color-bg-alt); border-radius: 4px; }
.library-entry h1 { font-family: var(--font-serif); font-size: 1.75rem; margin-bottom: var(--space-xs); }
.library-entry h2 { font-size: 1.15rem; color: var(--color-text-muted); font-weight: 400; margin-bottom: var(--space-lg); }
.library-entry h3 { font-family: var(--font-serif); font-size: 1.15rem; margin: var(--space-lg) 0 var(--space-sm); padding-bottom: var(--space-xs); border-bottom: 2px solid var(--color-border); }
.library-entry p { line-height: 1.7; margin-bottom: var(--space-md); }
.library-entry__sidebar { }
.library-entry__sidebar-box { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: 8px; padding: var(--space-md); margin-bottom: var(--space-md); }
.library-entry__sidebar-box h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-muted); margin-bottom: var(--space-sm); }
.library-entry__sidebar-box .btn { display: block; text-align: center; padding: var(--space-sm) var(--space-md); background: var(--color-primary); color: #fff; border-radius: 6px; font-weight: 600; margin-top: var(--space-sm); }
.library-entry__sidebar-box .btn:hover { background: var(--color-primary-light); text-decoration: none; }
.citation-box { font-family: var(--font-mono); font-size: 0.8rem; background: #fff; padding: var(--space-sm); border-radius: 4px; line-height: 1.5; word-break: break-all; }
@media (max-width: 768px) { .library-entry { grid-template-columns: 1fr; } }

/* === Thinker Index === */
.thinker-index { max-width: var(--max-width); margin: 0 auto; padding: var(--space-lg) var(--space-md); display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }
.thinker-card { background: #fff; border: 1px solid var(--color-border); border-radius: 8px; padding: var(--space-md); text-align: center; }
.thinker-card__name { font-weight: 600; }
.thinker-card__dates { font-size: 0.8rem; color: var(--color-text-muted); }
.thinker-card__domain { font-size: 0.75rem; color: var(--color-primary-light); margin-top: var(--space-xs); }
@media (max-width: 768px) { .thinker-index { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .thinker-index { grid-template-columns: 1fr; } }

/* === Thinker Profile === */
.thinker-profile { max-width: var(--max-width); margin: 0 auto; padding: var(--space-lg) var(--space-md); display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
@media (max-width: 768px) { .thinker-profile { grid-template-columns: 1fr; } }

/* === Pathway === */
.pathway { max-width: var(--max-width); margin: 0 auto; padding: var(--space-lg) var(--space-md); }
.pathway-step { display: flex; gap: var(--space-md); padding: var(--space-md) 0; border-bottom: 1px solid var(--color-border); }
.pathway-step__number { flex-shrink: 0; width: 40px; height: 40px; background: var(--color-primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; }
.pathway-step__content { flex: 1; }
.pathway-step__title { font-family: var(--font-serif); font-size: 1rem; font-weight: 600; }
.pathway-step__author { font-size: 0.85rem; color: var(--color-text-muted); }

/* === Courses Page === */
.courses-page { max-width: var(--max-width); margin: 0 auto; padding: var(--space-lg) var(--space-md); }
.course-link-card { background: #fff; border: 1px solid var(--color-border); border-radius: 8px; padding: var(--space-md); margin-bottom: var(--space-md); }

/* === Tag list === */
.tag-list { display: flex; flex-wrap: wrap; gap: var(--space-sm); padding: var(--space-md) 0; }

/* === Utility === */
.text-center { text-align: center; }
.btn { display: inline-block; padding: var(--space-sm) var(--space-md); background: var(--color-primary); color: #fff; border-radius: 6px; font-weight: 600; text-decoration: none; }
.btn:hover { background: var(--color-primary-light); color: #fff; text-decoration: none; }
.btn--outline { background: transparent; border: 1px solid var(--color-primary); color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; }

/* === Phase 3: Library search & filters === */
.library-controls { margin-bottom: var(--space-lg); }
.library-search-wrapper { margin-bottom: var(--space-md); }
.library-search-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.library-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(45, 74, 111, 0.1);
}
.library-filters {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  align-items: center;
}
.filter-select {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.875rem;
  background: #fff;
  cursor: pointer;
  min-width: 140px;
  flex: 1 0 auto;
}
.filter-select:focus {
  outline: none;
  border-color: var(--color-primary);
}
.filter-clear-btn {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.875rem;
  background: var(--color-bg-alt);
  cursor: pointer;
  white-space: nowrap;
}
.filter-clear-btn:hover { background: var(--color-border); }

/* === Result count === */
.library-results-info {
  margin-bottom: var(--space-md);
  min-height: 1.5rem;
}
.result-count {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* === Library grid === */
.library-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
@media (max-width: 768px) { .library-grid { grid-template-columns: 1fr; } }

/* === Filtered out === */
.entry-card.filtered-out { display: none; }

/* === Pagefind results overlay === */
.pagefind-results {
  position: fixed;
  top: 64px;
  right: 0;
  width: 480px;
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  background: #fff;
  border-left: 1px solid var(--color-border);
  box-shadow: -4px 0 20px rgba(0,0,0,0.1);
  z-index: 200;
}
.pagefind-results__inner { padding: var(--space-md); }
.pagefind-results__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}
.pagefind-results__header h3 { font-family: var(--font-serif); font-size: 1.1rem; }
.pagefind-result-item {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: var(--space-sm);
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.1s;
}
.pagefind-result-item:hover { background: var(--color-bg-alt); }
.pagefind-result-item strong { display: block; font-size: 0.95rem; }
.pagefind-result-meta { font-size: 0.8rem; color: var(--color-text-muted); }
.pagefind-result-excerpt { font-size: 0.825rem; color: var(--color-text-muted); display: block; margin-top: 2px; }
@media (max-width: 768px) { .pagefind-results { width: 100%; } }

/* === Seed dot on card === */
.seed-dot { font-size: 0.85rem; line-height: 1; }

/* === Domain stats === */
.domain-stats {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}
.domain-stats__item { text-align: center; }
.domain-stats__number { display: block; font-size: 1.5rem; font-weight: 700; color: var(--color-primary); }
.domain-stats__label { font-size: 0.8rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* === Thinker mini grid (domain pages) === */
.thinker-mini-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}
.thinker-mini-card {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.875rem;
  transition: background 0.1s;
}
.thinker-mini-card:hover { background: var(--color-bg-alt); text-decoration: none; }
.thinker-mini-card strong { display: block; }
.thinker-mini-card span { font-size: 0.8rem; color: var(--color-text-muted); display: block; }
@media (max-width: 480px) { .thinker-mini-grid { grid-template-columns: 1fr; } }

/* === Domain intro === */
.domain-intro p { margin-bottom: var(--space-md); }
.domain-intro ul, .domain-intro ol { margin: var(--space-sm) 0 var(--space-md) var(--space-lg); }

/* === Reviewer checklist === */
.library-entry__checklist { background: #fff8e1; border-color: #f9a825; }
.checklist { list-style: none; font-size: 0.875rem; }
.checklist__item { margin-bottom: var(--space-sm); }
.checklist__checkbox { margin-right: var(--space-sm); }
.checklist__prompt {
  margin-top: var(--space-md);
  padding: var(--space-sm);
  background: #fff;
  border-radius: 4px;
  font-size: 0.8rem;
  line-height: 1.5;
}
.checklist__prompt code {
  background: var(--color-bg-alt);
  padding: 1px 4px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* === Phase 4: Accessibility & Production === */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: #fff;
  z-index: 1000;
  border-radius: 0 0 6px 6px;
  font-weight: 600;
  font-size: 0.9rem;
}
.skip-link:focus {
  top: 0;
  color: #fff;
  text-decoration: none;
}

/* Focus styles for keyboard users */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Reduced motion */
@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;
  }
}

/* Print styles */
@media print {
  .nav,
  .footer,
  .hero-search,
  .btn {
    display: none !important;
  }
  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}