@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  color-scheme: light;

  /* Light Mode Palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f4f7fb;
  --bg-tertiary: rgba(15, 23, 42, 0.04);

  --text-primary: #0f172a;
  --text-secondary: #55637a;

  --accent-cyan: #0e7490;
  --accent-purple: #2563eb;
  --accent-gradient: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-cyan) 100%);

  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.22);
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);

  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --spacing-xxl: 8rem;
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 24px;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

/* Glassmorphism Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: all 0.3s ease;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.28);
}

.btn-secondary {
  background: #fff;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 8rem 5% 4rem;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: var(--accent-gradient);
  filter: blur(150px);
  opacity: 0.18;
  z-index: -1;
  border-radius: 50%;
}

.badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 1.5rem;
  max-width: 900px;
}

.hero h1 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Features Section */
.features {
  padding: var(--spacing-xxl) 5%;
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-primary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.05), 0 16px 32px rgba(15, 23, 42, 0.1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-tertiary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* CTA Section */
.cta {
  padding: var(--spacing-xxl) 5%;
  text-align: center;
  position: relative;
}

.cta-container {
  max-width: 800px;
  margin: 0 auto;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-card);
  padding: 4rem 2rem;
  position: relative;
  overflow: hidden;
}

.cta-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
}

.cta h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Footer */
.footer {
  padding: 4rem 5% 2rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
}

/* Article Styles */
.article-header {
  padding: 10rem 5% 4rem;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--glass-border);
}

.article-header h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  max-width: 900px;
  margin: 0 auto 1.5rem;
  line-height: 1.2;
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 5%;
}

.article-content p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 2rem;
  margin: 3rem 0 1.5rem;
  color: var(--text-primary);
}

.article-content ul {
  list-style-type: disc;
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.article-content li {
  margin-bottom: 0.75rem;
}

.article-content strong {
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 2rem;
    text-align: center;
  }
}