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

:root {
  /* Dark Theme (Default) */
  --bg-color: #050505;
  --surface-color: #121212;
  --surface-color-hover: #1e1e1e;
  --primary-color: #8b5cf6;
  /* Violet-500 */
  --primary-glow: rgba(139, 92, 246, 0.5);
  --secondary-color: #6366f1;
  /* Indigo-500 */
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --accent-color: #d8b4fe;
  /* Violet-300 */
  --border-color: rgba(255, 255, 255, 0.05);
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.05);
  --glass-shadow: none;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --gradient-text: linear-gradient(to right, #c084fc, #6366f1);

  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
}

/* Light Theme Variables */
body.light {
  --bg-color: #f9fafb;
  /* Gray-50 */
  --surface-color: #ffffff;
  --surface-color-hover: #f3f4f6;
  --primary-color: #7c3aed;
  /* Violet-600 (Darker for contrast) */
  --primary-glow: rgba(124, 58, 237, 0.15);
  --secondary-color: #4f46e5;
  /* Indigo-600 */
  --text-primary: #111827;
  /* Gray-900 */
  --text-secondary: #4b5563;
  /* Gray-600 */
  --accent-color: #8b5cf6;
  /* Violet-500 */
  --border-color: rgba(0, 0, 0, 0.05);
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.05);
  --glass-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);

  --gradient-text: linear-gradient(to right, #7c3aed, #4f46e5);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

ul {
  list-style: none;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

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

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

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

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.flex {
  display: flex;
  gap: var(--spacing-md);
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Components */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-medium);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 14px 0 var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 var(--primary-glow);
}

.btn-outline {
  background: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background: rgba(139, 92, 246, 0.1);
}

/* Glassmorphism Card */
.glass-card,
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: var(--transition-medium);
  box-shadow: var(--glass-shadow);
}

.glass-card:hover,
.card:hover {
  border-color: rgba(139, 92, 246, 0.3);
  transform: translateY(-5px);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--spacing-md) 0;
  background: rgba(5, 5, 5, 0.8);
  /* Dark mode default */
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease;
}

body.light .navbar {
  background: rgba(255, 255, 255, 0.8);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition-medium);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Theme Toggle Button */
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--primary-color);
  background: rgba(139, 92, 246, 0.1);
}

/* Timeline Styles */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--primary-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2.6rem;
  /* Adjust based on padding-left of timeline */
  top: 0;
  width: 20px;
  height: 20px;
  background-color: var(--bg-color);
  border: 3px solid var(--primary-color);
  border-radius: 50%;
  z-index: 1;
  transition: background-color 0.3s ease;
}

.timeline-date {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  display: block;
}

.timeline-content {
  /* Inherits glass-card styles if applied */
}

.timeline-content ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-top: 1rem;
}

.timeline-content li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* Mobile Menu */
.hamburger {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--text-primary);
}

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

  h2 {
    font-size: 2rem;
  }

  .nav-links {
    display: none;
    /* Hidden by default on mobile */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-color);
    flex-direction: column;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    align-items: flex-start;
  }

  .nav-links.active {
    display: flex;
  }

  .hamburger {
    display: block;
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-dot {
    left: -2.1rem;
    width: 16px;
    height: 16px;
  }
}