/* Haircarebuy - Premium Stylesheet */
:root {
  --primary-color: #1a5f4a;
  --primary-dark: #0d3d30;
  --primary-light: #2d7d5f;
  --secondary-color: #e8a54b;
  --accent-color: #4a9d7c;
  --text-color: #1a1a2e;
  --text-light: #4a4a5a;
  --text-muted: #6b7280;
  --bg-color: #fafcfb;
  --bg-light: #f0f5f3;
  --bg-cream: #f8f6f2;
  --bg-gradient-start: #f0f7f4;
  --bg-gradient-end: #e8f4f0;
  --border-color: #e2e8e5;
  --border-light: #eef2ef;
  --white: #ffffff;
  --shadow-sm: 0 2px 8px rgba(26, 95, 74, 0.06);
  --shadow-md: 0 4px 20px rgba(26, 95, 74, 0.1);
  --shadow-lg: 0 8px 40px rgba(26, 95, 74, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1280px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.7;
  color: var(--text-color);
  background-color: var(--bg-color);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { line-height: 1.3; color: var(--text-color); font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); }
p { margin-bottom: 1rem; color: var(--text-light); }
p:last-child { margin-bottom: 0; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: var(--max-width); margin: 0 auto; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo img { height: 90px; width: auto; object-fit: contain; transition: var(--transition); filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1)); }
.logo:hover img { transform: scale(1.02); filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15)); }
.logo-text { font-size: 2.5rem; font-weight: 800; color: var(--primary-color); display: flex; align-items: baseline; }
.logo-text span { color: var(--secondary-color); font-weight: 400; }
.nav { display: flex; align-items: center; gap: 32px; }
.nav-links { display: flex; gap: 8px; }
.nav-links a {
  color: var(--text-light);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 10px 18px;
  border-radius: var(--radius);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--primary-color); background: var(--bg-light); }
.nav-links a.active { color: var(--primary-color); font-weight: 600; }

/* Language Switcher */
.language-switcher { position: relative; }
.language-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-color);
  transition: var(--transition);
}
.language-btn:hover { background: var(--primary-color); color: white; border-color: var(--primary-color); }
.language-switcher:hover .language-btn svg { transform: rotate(180deg); }
.language-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  overflow: hidden;
}
.language-switcher:hover .language-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.language-dropdown a { display: block; padding: 12px 16px; color: var(--text-color); font-weight: 500; transition: var(--transition); }
.language-dropdown a:hover { background: var(--bg-light); color: var(--primary-color); }
.language-dropdown a.active { background: var(--bg-cream); color: var(--primary-color); font-weight: 600; }

/* Mobile Menu */
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-menu-btn span { width: 24px; height: 2px; background: var(--text-color); border-radius: 2px; transition: var(--transition); }
.mobile-menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 50%, var(--bg-cream) 100%);
  padding: 80px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(74, 157, 124, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(232, 165, 75, 0.08) 0%, transparent 50%);
  animation: heroFloat 20s ease-in-out infinite;
}
@keyframes heroFloat { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(2%, 2%); } }
.hero .container { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 24px;
  box-shadow: 0 4px 20px rgba(26, 95, 74, 0.3);
}
.hero h1 {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  line-height: 1.2;
}
.hero p { font-size: 1.25rem; color: var(--text-light); max-width: 680px; margin: 0 auto 40px; line-height: 1.8; }

/* Stats */
.stats-bar { display: flex; justify-content: center; gap: 60px; margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--border-light); }
.stat-item { text-align: center; }
.stat-number { font-size: 2.5rem; font-weight: 800; color: var(--primary-color); display: block; }
.stat-label { font-size: 0.875rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* Section */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-subtitle { display: inline-block; color: var(--primary-color); font-weight: 600; font-size: 0.875rem; text-transform: uppercase; letter-spacing: 2px; margin-bottom: 12px; }
.section-title { margin-bottom: 16px; }
.section-description { color: var(--text-light); max-width: 600px; margin: 0 auto; font-size: 1.125rem; }

/* About Section */
.about-section { background: var(--white); }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-text h2 { margin-bottom: 24px; color: var(--primary-color); }
.about-text > p { font-size: 1.1rem; line-height: 1.9; }
.about-features { display: grid; gap: 24px; margin-top: 40px; }
.about-feature { display: flex; align-items: flex-start; gap: 20px; padding: 24px; background: var(--bg-light); border-radius: var(--radius); transition: var(--transition); }
.about-feature:hover { transform: translateX(8px); box-shadow: var(--shadow-md); }
.about-feature-icon { width: 56px; height: 56px; background: linear-gradient(135deg, var(--primary-color), var(--accent-color)); color: white; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.about-feature-icon svg { width: 28px; height: 28px; }
.about-feature h4 { margin-bottom: 6px; color: var(--text-color); }
.about-feature p { font-size: 0.95rem; margin: 0; color: var(--text-light); }
.about-image { background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%); border-radius: var(--radius-lg); height: 560px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: white; position: relative; overflow: hidden; box-shadow: var(--shadow-lg); }
.about-image::before { content: ''; position: absolute; inset: 0; background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
.about-image-content { text-align: center; position: relative; z-index: 1; }
.about-image-icon { width: 100px; height: 100px; background: rgba(255, 255, 255, 0.15); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 24px; font-size: 3rem; }
.about-image h3 { color: white; font-size: 1.75rem; margin-bottom: 8px; }
.about-image p { color: rgba(255, 255, 255, 0.8); font-size: 1rem; }

/* Category Cards */
.category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.category-card { background: var(--white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 32px; transition: var(--transition); position: relative; overflow: hidden; }
.category-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--primary-color), var(--accent-color)); transform: scaleX(0); transition: transform 0.3s ease; }
.category-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.category-card:hover::before { transform: scaleX(1); }
.category-card-icon { width: 72px; height: 72px; background: linear-gradient(135deg, var(--bg-light), var(--bg-cream)); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 2rem; margin-bottom: 20px; transition: var(--transition); }
.category-card:hover .category-card-icon { background: linear-gradient(135deg, var(--primary-color), var(--accent-color)); transform: scale(1.1); }
.category-card h3 { margin-bottom: 12px; color: var(--text-color); transition: var(--transition); }
.category-card:hover h3 { color: var(--primary-color); }
.category-card p { color: var(--text-light); margin-bottom: 20px; line-height: 1.7; }
.category-card .card-link { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-color); font-weight: 600; font-size: 0.95rem; }
.category-card .card-link svg { width: 20px; height: 20px; transition: transform 0.3s ease; }
.category-card:hover .card-link svg { transform: translateX(4px); }

/* Articles */
.bg-light { background: var(--bg-light); }
.articles-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 32px; }
.article-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); box-shadow: var(--shadow-sm); }
.article-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.article-card-image { height: 200px; background: linear-gradient(135deg, var(--primary-color), var(--accent-color)); display: flex; align-items: center; justify-content: center; font-size: 4rem; position: relative; }
.article-card-image::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to bottom, transparent 60%, rgba(0,0,0,0.3)); }
.article-card-content { padding: 28px; }
.article-card-tag { display: inline-block; background: var(--bg-light); color: var(--primary-color); padding: 6px 14px; border-radius: 50px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.article-card h3 { margin-bottom: 12px; color: var(--text-color); transition: var(--transition); }
.article-card:hover h3 { color: var(--primary-color); }
.article-card p { color: var(--text-light); font-size: 0.95rem; line-height: 1.7; margin-bottom: 0; }
.article-card .read-more { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; color: var(--primary-color); font-weight: 600; font-size: 0.9rem; }
.article-card .read-more svg { width: 18px; height: 18px; transition: transform 0.3s ease; }
.article-card:hover .read-more svg { transform: translateX(4px); }

/* Disclaimer Box */
.disclaimer-box { background: linear-gradient(135deg, var(--bg-cream), var(--bg-light)); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 40px; margin-top: 40px; border-left: 4px solid var(--secondary-color); }
.disclaimer-box h3 { color: var(--primary-color); margin-bottom: 16px; }
.disclaimer-box ul { padding-left: 20px; }
.disclaimer-box li { list-style: disc; margin-bottom: 8px; color: var(--text-light); }

/* Footer */
.footer { background: var(--primary-dark); color: white; padding: 80px 0 32px; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand h3 { color: white; margin-bottom: 16px; }
.footer-brand p { color: rgba(255, 255, 255, 0.7); font-size: 0.95rem; line-height: 1.8; }
.footer-links h4 { color: white; margin-bottom: 20px; font-size: 1rem; }
.footer-links a { display: block; color: rgba(255, 255, 255, 0.7); padding: 8px 0; font-size: 0.95rem; transition: var(--transition); }
.footer-links a:hover { color: white; transform: translateX(4px); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 32px; text-align: center; font-size: 0.875rem; }
.footer-bottom p { color: rgba(255, 255, 255, 0.7); display: inline-block; }
.footer-bottom a { color: rgba(255, 255, 255, 0.7); }
.footer-bottom a:hover { color: white; }

/* Page Header */
.page-header { background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end)); padding: 80px 0 60px; text-align: center; }
.page-header h1 { color: var(--primary-color); margin-bottom: 12px; }
.page-header p { color: var(--text-light); max-width: 600px; margin: 0 auto; font-size: 1.125rem; }

/* Breadcrumb */
.breadcrumb { padding: 16px 0; background: var(--bg-light); }
.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 0.875rem; }
.breadcrumb-list a { color: var(--primary-color); font-weight: 500; }
.breadcrumb-list a:hover { text-decoration: underline; }
.breadcrumb-list span { color: var(--text-muted); }
.breadcrumb-list li:not(:last-child)::after { content: '/'; margin-left: 8px; color: var(--text-muted); }

/* Content Section */
.content-section { padding: 80px 0; }
.content-card { background: var(--white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 40px; margin-bottom: 32px; transition: var(--transition); }
.content-card:hover { box-shadow: var(--shadow-md); }
.content-card h2 { color: var(--primary-color); margin-bottom: 20px; padding-bottom: 16px; border-bottom: 2px solid var(--bg-light); }
.content-card p { font-size: 1.05rem; line-height: 1.9; }
.content-card ul, .content-card ol { margin: 20px 0; padding-left: 24px; }
.content-card li { margin-bottom: 12px; color: var(--text-light); line-height: 1.8; }
.content-card strong { color: var(--text-color); }

/* Article Page */
.article-container { max-width: 800px; margin: 0 auto; padding: 60px 24px; }
.article-header { margin-bottom: 48px; padding-bottom: 32px; border-bottom: 1px solid var(--border-color); }
.article-header h1 { color: var(--primary-color); margin-bottom: 16px; line-height: 1.3; }
.article-meta { display: flex; gap: 24px; color: var(--text-muted); font-size: 0.9rem; }
.article-meta span { display: flex; align-items: center; gap: 6px; }
.article-content { line-height: 1.9; }
.article-content h2 { color: var(--primary-color); margin: 48px 0 24px; }
.article-content h3 { color: var(--text-color); margin: 32px 0 16px; }
.article-content p { font-size: 1.05rem; margin-bottom: 20px; }
.article-content ul, .article-content ol { margin: 24px 0; padding-left: 24px; }
.article-content li { margin-bottom: 12px; color: var(--text-color); }
.article-content table { width: 100%; border-collapse: collapse; margin: 32px 0; background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.article-content th, .article-content td { padding: 16px 20px; border: 1px solid var(--border-color); text-align: left; }
.article-content th { background: var(--bg-light); font-weight: 600; color: var(--primary-color); }
.article-content td { color: var(--text-color); }
.article-note { background: linear-gradient(135deg, var(--bg-cream), var(--bg-light)); border-left: 4px solid var(--secondary-color); padding: 24px 28px; margin: 32px 0; border-radius: 0 var(--radius) var(--radius) 0; }
.article-note strong { color: var(--primary-color); }

/* Related Articles */
.related-articles { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--border-color); }
.related-articles h3 { margin-bottom: 24px; color: var(--primary-color); }
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.related-item { background: var(--bg-light); padding: 24px; border-radius: var(--radius); transition: var(--transition); }
.related-item:hover { background: var(--white); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.related-item a { color: var(--primary-color); font-weight: 600; font-size: 1rem; display: block; margin-bottom: 8px; }
.related-item:hover a { color: var(--primary-dark); }
.related-item p { font-size: 0.875rem; color: var(--text-muted); margin: 0; }

/* Responsive */
@media (max-width: 1024px) { .about-content { grid-template-columns: 1fr; gap: 48px; } .about-image { order: -1; height: 400px; } .footer-content { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 768px) { .nav-links { display: none; } .mobile-menu-btn { display: flex; } .nav.active .nav-links { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--white); padding: 16px; border-bottom: 1px solid var(--border-color); box-shadow: var(--shadow-lg); } .nav-links a { padding: 16px 20px; } .stats-bar { flex-direction: column; gap: 24px; } .section { padding: 60px 0; } .hero { padding: 60px 0 80px; } .footer-content { grid-template-columns: 1fr; gap: 32px; } .category-grid { grid-template-columns: 1fr; } .articles-grid { grid-template-columns: 1fr; } }
@media (max-width: 480px) { .header-inner { padding: 12px 16px; } .container { padding: 0 16px; } .category-card { padding: 24px; } .content-card { padding: 24px; } }

/* Navigation Dropdown */
.nav-item-dropdown { position: relative; }
.nav-dropdown-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-light);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 10px 18px;
  border-radius: var(--radius);
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  transition: var(--transition);
}
.nav-dropdown-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform 0.3s ease;
}
.nav-item-dropdown:hover .nav-dropdown-btn { color: var(--primary-color); background: var(--bg-light); }
.nav-item-dropdown:hover .nav-dropdown-btn::after { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  overflow: hidden;
  z-index: 100;
}
.nav-item-dropdown:hover .nav-dropdown-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.nav-dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  color: var(--text-color);
  font-weight: 500;
  transition: var(--transition);
  border-bottom: 1px solid var(--border-light);
}
.nav-dropdown-menu a:last-child { border-bottom: none; }
.nav-dropdown-menu a:hover { background: var(--bg-light); color: var(--primary-color); }
.nav-dropdown-icon { width: 40px; height: 40px; background: var(--bg-light); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; transition: var(--transition); }
.nav-dropdown-menu a:hover .nav-dropdown-icon { background: var(--primary-color); color: white; }
.nav-dropdown-text { display: flex; flex-direction: column; }
.nav-dropdown-title { font-weight: 600; color: var(--text-color); }
.nav-dropdown-desc { font-size: 0.8rem; color: var(--text-muted); font-weight: 400; }

/* Knowledge Base Section */
.knowledge-section { padding: 100px 0; background: linear-gradient(180deg, var(--white) 0%, var(--bg-light) 100%); }
.knowledge-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; margin-top: 60px; }
.knowledge-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.knowledge-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}
.knowledge-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.knowledge-card:hover::before { transform: scaleX(1); }
.knowledge-icon { width: 80px; height: 80px; background: linear-gradient(135deg, var(--bg-light), var(--bg-cream)); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 2.2rem; margin: 0 auto 20px; transition: var(--transition); }
.knowledge-card:hover .knowledge-icon { background: linear-gradient(135deg, var(--primary-color), var(--accent-color)); transform: scale(1.1); }
.knowledge-card h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--text-color); transition: var(--transition); }
.knowledge-card:hover h3 { color: var(--primary-color); }
.knowledge-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; margin: 0; }
.knowledge-card .card-arrow { width: 40px; height: 40px; background: var(--bg-light); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 20px auto 0; opacity: 0; transform: translateY(10px); transition: var(--transition); }
.knowledge-card:hover .card-arrow { opacity: 1; transform: translateY(0); background: var(--primary-color); color: white; }

/* Topic Tags */
.topic-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.topic-tag { background: var(--bg-light); padding: 8px 16px; border-radius: 50px; font-size: 0.85rem; color: var(--text-light); font-weight: 500; transition: var(--transition); }
.topic-tag:hover { background: var(--primary-color); color: white; }

/* Section Divider */
.section-divider { display: flex; align-items: center; justify-content: center; gap: 16px; margin: 40px 0; color: var(--text-muted); font-size: 0.9rem; font-weight: 500; }
.section-divider::before, .section-divider::after { content: ''; width: 60px; height: 1px; background: var(--border-color); }

/* Responsive updates */
@media (max-width: 1024px) { .knowledge-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { .nav-dropdown-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; background: var(--bg-light); border-radius: 0; padding: 8px 0; min-width: auto; } .nav-item-dropdown:hover .nav-dropdown-menu { transform: none; } .nav-dropdown-menu a { padding: 12px 20px 12px 50px; } .knowledge-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .knowledge-grid { grid-template-columns: 1fr; } }

/* Pillars Section - 五大知识领域 */
.pillars-section { padding: 100px 0; background: linear-gradient(180deg, var(--white) 0%, var(--bg-light) 100%); }
.pillars-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; margin-top: 60px; }
.pillar-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  transition: var(--transition);
  overflow: hidden;
}
.pillar-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}
.pillar-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.pillar-card:hover::before { transform: scaleX(1); }
.pillar-icon {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--bg-light), var(--bg-cream));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-color);
  transition: var(--transition);
}
.pillar-card:hover .pillar-icon { background: linear-gradient(135deg, var(--primary-color), var(--accent-color)); color: white; transform: scale(1.1); }
.pillar-number {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--bg-light);
  line-height: 1;
  transition: var(--transition);
}
.pillar-card:hover .pillar-number { color: rgba(26, 95, 74, 0.1); }
.pillar-card h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--text-color); transition: var(--transition); }
.pillar-card:hover h3 { color: var(--primary-color); }
.pillar-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.pillar-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.pillar-tags span {
  background: var(--bg-light);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  color: var(--text-light);
  font-weight: 500;
}
.pillar-link { display: inline-flex; align-items: center; gap: 6px; color: var(--primary-color); font-weight: 600; font-size: 0.9rem; transition: var(--transition); }
.pillar-link:hover { gap: 10px; }

/* Responsive for pillars */
@media (max-width: 1200px) { .pillars-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { .pillars-grid { grid-template-columns: repeat(2, 1fr); } .pillars-section { padding: 60px 0; } }
@media (max-width: 480px) { .pillars-grid { grid-template-columns: 1fr; } }