:root {
  --bg-color: #000000;
  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --accent-color: #06c;
  --accent-glow: rgba(0, 102, 204, 0.4);
  --glass-bg: rgba(25, 25, 25, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Glassmorphism Header */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1rem 2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: transform 0.3s ease;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: var(--text-primary);
  text-decoration: none;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: 2rem;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Typography elements */
h1 {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 800px;
}

/* Gradient Text for emphasis */
.text-gradient {
  background: linear-gradient(90deg, #ff007f, #7f00ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

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

.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(127, 0, 255, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 2rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  margin-top: 2rem;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-color);
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

/* Featured Article Grid */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  margin: 4rem 0;
}

.article-card {
  background: #111;
  border-radius: 1.5rem;
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s ease;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.1);
  background: #151515;
}

.article-category {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.article-title {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-weight: 600;
}

.article-excerpt {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #555;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
}

/* Footer */
footer {
  padding: 4rem 2rem;
  text-align: center;
  background: #000;
  border-top: 1px solid #111;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Article Detail Page specific */
.article-header {
  padding: 8rem 2rem 4rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.article-content {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

.article-content p {
  color: var(--text-primary);
  opacity: 0.9;
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
  line-height: 1.7;
}

.article-content h2 {
  font-size: 2rem;
  margin: 3rem 0 1rem;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 1.8rem;
  }

  .article-grid {
    grid-template-columns: 1fr;
  }
}