:root {
  /* Color Palette - Premium Dark Theme */
  --bg-color: #0d1117;
  --bg-secondary: #161b22;
  --text-primary: #e6edf3;
  --text-secondary: #7d8590;
  --accent-color: #58a6ff;
  --accent-hover: #3182ce;
  --border-color: rgba(240, 246, 252, 0.1);
  --glass-bg: rgba(22, 27, 34, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Transitions & Shadows */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --shadow-sm: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 20px rgba(88, 166, 255, 0.2);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Glassmorphism Utilities */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

/* Typography basics */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 { font-size: 3.5rem; background: linear-gradient(135deg, #fff, var(--text-secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
h2 { font-size: 2.5rem; color: var(--text-primary); }
p { margin-bottom: var(--spacing-md); color: var(--text-secondary); font-size: 1.1rem; }
a { color: var(--accent-color); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-hover); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background-color: var(--accent-color);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(88, 166, 255, 0.4);
}

/* Base Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

section {
  padding: var(--spacing-xl) 0;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--spacing-md) 0;
  transition: background var(--transition-normal), padding var(--transition-normal);
}
.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--spacing-sm) 0;
}
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text-primary);
}
.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--accent-color);
  transition: width var(--transition-fast);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text-primary);
}
.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px; /* Offset for navbar */
}
.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -10%;
  width: 50vh;
  height: 50vh;
  background: radial-gradient(circle, rgba(88, 166, 255, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  z-index: -1;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero-text .subtitle {
  color: var(--accent-color);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}
.hero-image img {
  width: 100%;
  max-width: 400px;
  border-radius: 24px;
  box-shadow: var(--shadow-glow);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition-normal);
}
.hero-image img:hover {
  transform: translateY(-10px);
}
.hero-image::after {
  content: '';
  position: absolute;
  bottom: -20px;
  right: 10%;
  width: 80%;
  height: 20px;
  background: rgba(0,0,0,0.5);
  filter: blur(20px);
  border-radius: 50%;
  z-index: -1;
}

/* About Section */
.about {
  background-color: var(--bg-secondary);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}
.about-text {
  padding: var(--spacing-lg);
}

/* Video Section */
.video-section {
  text-align: center;
}
.video-container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--glass-border);
}
.video-container iframe, .video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-xl);
}
.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
}
.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}
.social-links a:hover {
  background: var(--accent-color);
  color: #fff;
  transform: translateY(-3px);
}
.footer-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Page Headers (for inner pages) */
.page-header {
  padding: 120px 0 60px;
  text-align: center;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text h1 {
    font-size: 2.5rem;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none; /* Mobile menu needed logic later if requested, for now just basic hiding or flex wrap */
  }
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
}