/* OpenAI Landing Page Clone - Solution */

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

body {
  background-color: #000000;
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
}

/* Header Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
}

.logo {
  font-size: 18px;
  font-weight: 600;
}

.login-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.login-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

/* Sidebar Styles */
.sidebar {
  position: fixed;
  left: 40px;
  top: 80px;
  width: 200px;
  z-index: 100;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-link {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
  transition: all 0.3s ease;
  font-size: 14px;
}

.sidebar-link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 1);
}

/* Main Content */
.main-content {
  margin-left: 280px;
  padding: 100px 40px 40px;
  max-width: 1200px;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 60px;
  border-radius: 20px;
  overflow: hidden;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #1e3c72 100%);
  opacity: 0.8;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 60px 40px;
}

.hero-title {
  font-size: 56px;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero-description {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 40px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* Button Styles */
.btn {
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: white;
  color: #000;
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 0.9);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(255, 255, 255, 0.2);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Featured Section */
.featured {
  margin-bottom: 60px;
}

.featured-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.featured-card {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 40px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(102, 126, 234, 0.2);
}

.featured-card.large {
  grid-column: 1;
}

.card-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.featured-card h3 {
  font-size: 24px;
  font-weight: 600;
}

/* Section Styles */
.section {
  margin-bottom: 80px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 40px;
}

/* News Grid */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.news-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.3s ease;
}

.news-card:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.news-thumbnail {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 8px;
  margin-bottom: 16px;
}

.news-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  font-weight: 600;
}

.news-meta {
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

/* Footer */
.footer {
  margin-top: 100px;
  padding: 60px 40px 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  margin-bottom: 8px;
  transition: color 0.3s ease;
}

.footer-col a:hover {
  color: rgba(255, 255, 255, 1);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.btn-download {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 14px 32px;
  font-size: 18px;
}

.btn-download:hover {
  background: rgba(255, 255, 255, 0.15);
}