/* ============================================
   DentalPedia — Global Styles
   ============================================ */

:root {
  /* Light theme (default) */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #7a7a9a;
  --border-color: #e2e8f0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-lg: 12px;
  --tooth-accent: #14b8a6;
  --tooth-accent-light: #ccfbf1;
  --eeat-bg: #f0fdf4;
  --eeat-border: #86efac;
  --source-bg: #eff6ff;
  --source-border: #93c5fd;
  --disclaimer-bg: #fefce8;
  --disclaimer-border: #fde047;
  --max-width: 1200px;
  --content-width: 800px;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #334155;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: #1e3a5f;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
  --tooth-accent: #2dd4bf;
  --tooth-accent-light: #134e4a;
  --eeat-bg: #0d2818;
  --eeat-border: #22c55e;
  --source-bg: #172554;
  --source-border: #3b82f6;
  --disclaimer-bg: #422006;
  --disclaimer-border: #ca8a04;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

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

/* ---- Layout ---- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.content-width { max-width: var(--content-width); margin: 0 auto; }

/* ---- Header / Navbar ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.9);
}
[data-theme="dark"] .navbar {
  background: rgba(15,23,42,0.9);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}
.navbar-brand:hover { text-decoration: none; color: var(--text-primary); }

.navbar-brand .logo-icon {
  font-size: 1.5rem;
}

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

.navbar-nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.navbar-nav a:hover { color: var(--accent); text-decoration: none; }

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-primary);
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); }

/* ---- Hero / Homepage ---- */
.hero {
  text-align: center;
  padding: 5rem 1.5rem 3rem;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}
.stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--tooth-accent);
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---- Search ---- */
.search-container {
  max-width: 600px;
  margin: 0 auto 3rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3rem;
  font-size: 1.1rem;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  background: var(--bg-card);
  color: var(--text-primary);
  transition: all 0.3s;
  outline: none;
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.search-input::placeholder { color: var(--text-muted); }

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-results {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 400px;
  overflow-y: auto;
  display: none;
  z-index: 50;
}
.search-results.active { display: block; }

.search-result-item {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.15s;
}
.search-result-item:hover { background: var(--bg-secondary); }
.search-result-item:last-child { border-bottom: none; }

.search-result-item .result-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}
.search-result-item .result-category {
  font-size: 0.8rem;
  color: var(--tooth-accent);
}

/* ---- Categories Grid ---- */
.categories-section {
  padding: 2rem 0 4rem;
}
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-align: center;
  transition: all 0.2s;
  text-decoration: none;
  color: var(--text-primary);
}
.category-card:hover {
  border-color: var(--tooth-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--text-primary);
}

.category-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.category-name { font-weight: 600; font-size: 0.95rem; }
.category-count { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }

/* ---- Recent Articles ---- */
.articles-section { padding: 2rem 0 4rem; }

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all 0.2s;
  text-decoration: none;
  color: var(--text-primary);
  display: block;
}
.article-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  text-decoration: none;
  color: var(--text-primary);
}
.article-card .card-category {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tooth-accent);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.article-card .card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}
.article-card .card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ---- Article Page ---- */
.article-page { padding: 2rem 0 4rem; }

.article-breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.article-breadcrumb a { color: var(--text-muted); }
.article-breadcrumb a:hover { color: var(--accent); }

.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
}
.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}
.article-body p { margin-bottom: 1.25rem; }
.article-body ul, .article-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}
.article-body li { margin-bottom: 0.5rem; }

/* ---- Table of Contents ---- */
.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}
.toc-title {
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}
.toc-list { list-style: none; }
.toc-list li { margin-bottom: 0.4rem; }
.toc-list a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.toc-list a:hover { color: var(--accent); }

/* ---- E-E-A-T Reviewer Card ---- */
.eeat-card {
  background: var(--eeat-bg);
  border: 1px solid var(--eeat-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 3rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.eeat-icon { font-size: 2rem; flex-shrink: 0; }
.eeat-content { flex: 1; }
.eeat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tooth-accent);
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.eeat-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.eeat-credentials {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}
.eeat-link a {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
}

/* ---- Sources Card ---- */
.sources-card {
  background: var(--source-bg);
  border: 1px solid var(--source-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.25rem;
}
.sources-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.75rem;
}
.sources-list { list-style: none; }
.sources-list li {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
}
.sources-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ---- Disclaimer ---- */
.disclaimer {
  background: var(--disclaimer-bg);
  border: 1px solid var(--disclaimer-border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-top: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
}
.disclaimer-icon { flex-shrink: 0; }

/* ---- Related Articles ---- */
.related-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}
.related-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

/* ---- Suggest Edit Button ---- */
.suggest-edit-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.suggest-edit-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* ---- Dentists Directory ---- */
.dentists-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.dentist-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all 0.2s;
}
.dentist-card:hover {
  box-shadow: var(--shadow-md);
}
.dentist-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.dentist-creds {
  font-size: 0.9rem;
  color: var(--tooth-accent);
  margin-bottom: 0.5rem;
}
.dentist-practice {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}
.dentist-articles {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-top: 4rem;
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-links a:hover { color: var(--accent); }

/* ---- Category Page ---- */
.category-header {
  padding: 3rem 0 2rem;
  text-align: center;
}
.category-header h1 {
  font-size: 2rem;
  font-weight: 800;
}
.category-header p {
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* ---- A-Z Index ---- */
.az-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-bottom: 2rem;
}
.az-index a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.az-index a:hover, .az-index a.active {
  background: var(--accent);
  color: white;
  text-decoration: none;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .hero { padding: 3rem 1rem 2rem; }
  .navbar-nav { gap: 0.75rem; }
  .navbar-nav a { font-size: 0.8rem; }
  .eeat-card { flex-direction: column; }
  .article-header h1 { font-size: 1.75rem; }
  .footer-content { flex-direction: column; text-align: center; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.25rem; }
}

@media (max-width: 480px) {
  .categories-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.75rem; }
  .navbar-nav { gap: 0.5rem; }
}