/* Base CSS Variables and Utilities */
:root {
  /* Color Palette */
  --primary-indigo: #4f46e5;
  --primary-violet: #7c3aed;
  --primary-blue: #2563eb;
  --accent-teal: #06b6d4;
  --accent-lime: #84cc16;
  --bg-white: #ffffff;
  --bg-light-gray: #f9f9f9;
  --text-dark: #111827;
  --text-medium: #4b5563;
  --text-light: #9ca3af;
  --shadow-color: rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-headline: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --bg-white: #111827;
  --bg-light-gray: #1f2937;
  --text-dark: #f9fafb;
  --text-medium: #d1d5db;
  --text-light: #9ca3af;
  --shadow-color: rgba(0, 0, 0, 0.3);
}

/* Global Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-white);
  color: var(--text-dark);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 3rem; /* 48px */
}

h2 {
  font-size: 2rem; /* 32px */
  font-weight: 600;
}

h3 {
  font-size: 1.5rem; /* 24px */
  font-weight: 600;
}

p {
  font-size: 1.125rem; /* 18px */
  margin-bottom: var(--spacing-md);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-2xl);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-indigo), var(--primary-violet), var(--primary-blue));
  color: white;
}

.btn-secondary {
  background-color: white;
  color: var(--primary-indigo);
  border: 1px solid var(--primary-indigo);
}

.btn-accent {
  background-color: var(--accent-teal);
  color: white;
}

/* Cards */
.card {
  background-color: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: 0 4px 16px var(--shadow-color);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px var(--shadow-color);
}

/* Section Styling */
.section {
  padding: var(--spacing-xl) 0;
}

.section-alt {
  background-color: var(--bg-light-gray);
}

/* Utilities */
.text-center {
  text-align: center;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.grid {
  display: grid;
}

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

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

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

/* Responsive Utilities */
@media (max-width: 1024px) {
  h1 {
    font-size: 2.5rem; /* 40px */
  }
  
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem; /* 32px */
  }
  
  h2 {
    font-size: 1.5rem; /* 24px */
  }
  
  .grid-cols-2, .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
}