@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #0066ff;
  --primary-dark: #0052cc;
  --gradient-start: #667eea;
  --gradient-end: #764ba2;
  --text-dark: #1a1a2e;
  --text-light: #6b7280;
  --bg-light: #f8fafc;
  --white: #ffffff;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--white);
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
}

.nav {
  display: flex;
  gap: 35px;
}

.nav a {
  color: var(--text-dark);
  font-weight: 500;
  transition: color 0.3s;
}

.nav a:hover {
  color: var(--primary);
}

.header-btn {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  padding: 10px 24px;
  border-radius: 25px;
  font-weight: 600;
  transition: transform 0.3s, box-shadow 0.3s;
}

.header-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

/* Hero Section */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(180deg, #f0f4ff 0%, var(--white) 100%);
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
  color: var(--gradient-start);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 25px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 20px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  padding: 16px 40px;
  border-radius: 30px;
  font-size: 18px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: var(--white);
  color: var(--text-dark);
  padding: 16px 40px;
  border-radius: 30px;
  font-size: 18px;
  font-weight: 600;
  border: 2px solid #e5e7eb;
  transition: all 0.3s;
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Features */
.features {
  padding: 100px 0;
}

.features.alt-bg {
  background: var(--bg-light);
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 15px;
  background: linear-gradient(135deg, var(--text-dark), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title p {
  font-size: 18px;
  color: var(--text-light);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--white);
  border-radius: 20px;
  padding: 40px;
  transition: all 0.3s;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin-bottom: 25px;
}

.feature-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-light);
  font-size: 16px;
}

/* Stats Section */
.stats {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
}

.stat-item h3 {
  font-size: 48px;
  font-weight: 900;
  color: white;
  margin-bottom: 10px;
}

.stat-item p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 16px;
}

/* Articles Section */
.articles {
  padding: 100px 0;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.article-card {
  background: var(--white);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  transition: all 0.3s;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.article-img {
  height: 200px;
  background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.article-content {
  padding: 25px;
}

.article-tag {
  display: inline-block;
  background: rgba(102, 126, 234, 0.1);
  color: var(--gradient-start);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
}

.article-card p {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 15px;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  color: #9ca3af;
  font-size: 13px;
}

/* Footer */
.footer {
  background: var(--text-dark);
  color: white;
  padding: 80px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 15px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  line-height: 1.8;
}

.footer-links h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

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

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

/* Article Page */
.article-page {
  padding: 120px 0 80px;
}

.article-header {
  max-width: 800px;
  margin: 0 auto 40px;
  text-align: center;
}

.article-header h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}

.article-info {
  display: flex;
  justify-content: center;
  gap: 30px;
  color: var(--text-light);
  font-size: 14px;
}

.article-body {
  max-width: 800px;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.9;
}

.article-body h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 40px 0 20px;
}

.article-body h3 {
  font-size: 22px;
  font-weight: 600;
  margin: 30px 0 15px;
}

.article-body p {
  margin-bottom: 20px;
  color: #374151;
}

.article-body ul, .article-body ol {
  margin: 20px 0;
  padding-left: 30px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body blockquote {
  border-left: 4px solid var(--gradient-start);
  padding-left: 20px;
  margin: 30px 0;
  font-style: italic;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .section-title h2 {
    font-size: 32px;
  }
}