/* ============================================
   DENTAL DECODED — Global Styles
   Warm & Friendly Design System
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-primary: #2A9D8F;
  --color-primary-light: #3AB8A8;
  --color-primary-dark: #1F7A6F;
  --color-secondary: #264653;
  --color-accent: #E9C46A;
  --color-accent-warm: #F4A261;
  --color-bg: #FAFAF7;
  --color-bg-warm: #FFF8F0;
  --color-bg-card: #FFFFFF;
  --color-text: #2D3436;
  --color-text-light: #636E72;
  --color-text-muted: #9BA4A8;
  --color-border: #E8E8E4;
  --color-border-light: #F0F0EC;
  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-hover: 0 8px 25px rgba(42,157,143,0.15);
  --max-width: 1200px;
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-primary-dark);
}

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

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-secondary);
  line-height: 1.25;
}
h1 { font-size: 2.5rem; }
h2 { font-size: 1.85rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

main {
  flex: 1;
}

/* ============================================
   HEADER / NAV
   ============================================ */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-secondary);
  text-decoration: none;
}
.logo svg, .logo img {
  width: 38px;
  height: 38px;
}
.logo span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-links a:hover {
  color: var(--color-primary);
}
.nav-links a:hover::after {
  width: 100%;
}

.nav-search-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-light);
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.nav-search-btn:hover {
  color: var(--color-primary);
  background: var(--color-bg);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--color-bg-warm) 0%, #E8F6F3 100%);
  padding: 64px 0;
  margin-bottom: 48px;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-text h1 {
  font-size: 3rem;
  margin-bottom: 16px;
  color: var(--color-secondary);
}
.hero-text h1 span {
  color: var(--color-primary);
}
.hero-text p {
  font-size: 1.15rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
  text-decoration: none;
}
.hero-cta:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.hero-featured {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition);
}
.hero-featured:hover {
  transform: translateY(-4px);
}
.hero-featured-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
}
.hero-featured-body {
  padding: 24px;
}
.hero-featured-body .tag {
  display: inline-block;
  background: #E8F6F3;
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-xl);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.hero-featured-body h3 {
  margin-bottom: 8px;
}
.hero-featured-body h3 a {
  color: var(--color-secondary);
}
.hero-featured-body h3 a:hover {
  color: var(--color-primary);
}
.hero-featured-body p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ============================================
   CATEGORY TILES
   ============================================ */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
}
.section-header h2 {
  font-size: 1.85rem;
}
.section-header a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 16px;
  margin-bottom: 60px;
}

.category-tile {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.category-tile:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.category-tile .icon {
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #E8F6F3;
}
.category-tile .label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-secondary);
}
.category-tile .count {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ============================================
   ARTICLE CARDS
   ============================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
  margin-bottom: 60px;
}

.article-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.article-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.article-card-img {
  width: 100%;
  height: 190px;
  object-fit: cover;
}
.article-card-img-placeholder {
  width: 100%;
  height: 190px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.article-card-body {
  padding: 20px;
}
.article-card-body .tag {
  display: inline-block;
  background: #E8F6F3;
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}
.article-card-body h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}
.article-card-body h3 a {
  color: var(--color-secondary);
}
.article-card-body h3 a:hover {
  color: var(--color-primary);
}
.article-card-body p {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}
.article-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-muted);
}

/* ============================================
   SINGLE ARTICLE PAGE
   ============================================ */
.article-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article-page .breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}
.article-page .breadcrumb a {
  color: var(--color-text-light);
}
.article-page .breadcrumb a:hover {
  color: var(--color-primary);
}

.article-header {
  margin-bottom: 36px;
}
.article-header .tag {
  display: inline-block;
  background: #E8F6F3;
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}
.article-header h1 {
  font-size: 2.6rem;
  margin-bottom: 16px;
  line-height: 1.2;
}
.article-header .article-meta {
  font-size: 0.9rem;
}

.article-hero-img {
  width: 100%;
  border-radius: var(--radius-lg);
  margin-bottom: 36px;
  max-height: 420px;
  object-fit: cover;
}

.article-content {
  font-size: 1.08rem;
  line-height: 1.85;
}
.article-content h2 {
  margin-top: 40px;
  margin-bottom: 16px;
  font-size: 1.6rem;
}
.article-content h3 {
  margin-top: 32px;
  margin-bottom: 12px;
}
.article-content p {
  margin-bottom: 18px;
}
.article-content ul, .article-content ol {
  margin-bottom: 18px;
  padding-left: 24px;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 16px 24px;
  margin: 24px 0;
  background: #E8F6F3;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-secondary);
}
.article-content code {
  background: var(--color-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}
.article-content pre {
  background: var(--color-secondary);
  color: #e8e8e4;
  padding: 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 18px;
}
.article-content img {
  border-radius: var(--radius-md);
  margin: 24px 0;
}

/* Key takeaway box */
.callout {
  background: linear-gradient(135deg, #E8F6F3, #FFF8F0);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 28px 0;
  border-left: 4px solid var(--color-primary);
}
.callout h4 {
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* ============================================
   CATEGORY PAGE
   ============================================ */
.category-header {
  background: linear-gradient(135deg, var(--color-bg-warm), #E8F6F3);
  padding: 48px 0;
  margin-bottom: 40px;
  text-align: center;
}
.category-header .icon {
  font-size: 3rem;
  margin-bottom: 12px;
}
.category-header h1 {
  margin-bottom: 8px;
}
.category-header p {
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================
   SEARCH PAGE
   ============================================ */
.search-section {
  padding: 48px 0 80px;
}

.search-box {
  max-width: 640px;
  margin: 0 auto 48px;
  position: relative;
}
.search-box input {
  width: 100%;
  padding: 16px 24px 16px 52px;
  font-size: 1.1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-family: var(--font-body);
  background: #fff;
  transition: border-color var(--transition);
  outline: none;
}
.search-box input:focus {
  border-color: var(--color-primary);
}
.search-box .search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

.search-results-count {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

/* ============================================
   ABOUT / CONTACT PAGES
   ============================================ */
.static-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.static-page h1 {
  margin-bottom: 24px;
}
.static-page p {
  margin-bottom: 16px;
  color: var(--color-text-light);
  font-size: 1.05rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 480px;
  margin-top: 32px;
}
.contact-form label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-secondary);
}
.contact-form input,
.contact-form textarea {
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition);
  outline: none;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--color-primary);
}
.contact-form textarea {
  resize: vertical;
  min-height: 140px;
}
.contact-form button {
  background: var(--color-primary);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-xl);
  border: none;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  align-self: flex-start;
}
.contact-form button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--color-secondary);
  color: #B0BEC5;
  padding: 48px 0 24px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 12px;
}
.footer-brand span {
  color: var(--color-primary-light);
}
.footer-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 300px;
}

.footer-col h4 {
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  color: #B0BEC5;
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-col a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

/* ============================================
   LOADING STATE
   ============================================ */
.skeleton {
  background: linear-gradient(90deg, var(--color-border-light) 25%, #fff 50%, var(--color-border-light) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.loading-spinner {
  display: flex;
  justify-content: center;
  padding: 60px;
}
.loading-spinner::after {
  content: '';
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-text h1 { font-size: 2.2rem; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  h1 { font-size: 2rem; }
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    gap: 16px;
  }

  .hero { padding: 36px 0; }
  .hero-text h1 { font-size: 1.8rem; }
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-header h1 { font-size: 1.8rem; }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   UTILITY
   ============================================ */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-4 { margin-bottom: 32px; }
.no-articles {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}
.no-articles h3 {
  margin-bottom: 8px;
  color: var(--color-text-light);
}