:root {
  --primary-color: #FF9F1C;
  --secondary-color: #2EC4B6;
  --accent-color: #E71D36;
  --bg-light: #FFFFFF;
  --bg-dark: #0f172a;
  --bg-dark-secondary: #1e293b;
  --bg-card: rgba(255, 255, 255, 0.02);
  --text-primary: #2D3436;
  --text-secondary: #636E72;
  --text-muted: #B2BEC3;
  --text-white: #FFFFFF;
  --text-white-secondary: rgba(255, 255, 255, 0.7);
  --border-color: #E8ECEF;
  --border-dark: rgba(255, 255, 255, 0.05);
  --shadow-sm: 0 2px 8px rgba(45, 52, 54, 0.08);
  --shadow-md: 0 4px 16px rgba(45, 52, 54, 0.12);
  --shadow-lg: 0 8px 32px rgba(45, 52, 54, 0.16);
  --shadow-dark: 0 20px 40px rgba(0, 0, 0, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

[data-theme="light"] {
  --bg-light: #f8fafc;
  --bg-dark: #f1f5f9;
  --bg-dark-secondary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.8);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-white: #0f172a;
  --text-white-secondary: #475569;
  --border-color: #e2e8f0;
  --border-dark: rgba(15, 23, 42, 0.1);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 8px 32px rgba(15, 23, 42, 0.12);
  --shadow-dark: 0 20px 40px rgba(15, 23, 42, 0.15);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-light);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* ========== RESPONSIVE BREAKPOINTS ========== */
/* === PC (Desktop) - default styles already applied (1025px+) === */

/* === Tablet (768px - 1024px) === */
@media (max-width: 1024px) {
  .container {
    max-width: 900px;
    padding: 0 var(--spacing-md);
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.625rem; }
  h3 { font-size: 1.35rem; }
  h4 { font-size: 1.15rem; }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
  .grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.95rem;
  }
}

/* === Mobile (481px - 768px) === */
@media (max-width: 768px) {
  .container {
    max-width: 680px;
    padding: 0 var(--spacing-sm);
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  h4 { font-size: 1.1rem; }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    min-width: 140px;
  }
  
  .flex {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .flex-row-sm {
    flex-direction: row;
  }
}

/* === Small Mobile (max-width: 480px) === */
@media (max-width: 480px) {
  .container {
    max-width: 100%;
    padding: 0 var(--spacing-xs);
  }
  
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.1rem; }
  h4 { font-size: 1rem; }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .grid-4 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    width: 100%;
    max-width: 280px;
  }
  
  .flex {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  p {
    font-size: 0.9rem;
    line-height: 1.6;
  }
}

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

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

a:hover {
  color: var(--accent-color);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition-fast);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 1rem;
  transition: all var(--transition-normal);
}

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

.btn-primary:hover {
  background-color: #e68a00;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: white;
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

img {
  max-width: 100%;
  height: auto;
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.section {
  padding: var(--spacing-2xl) 0;
}

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

.section-title h2 {
  font-size: 2rem;
  color: var(--text-primary);
}

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

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

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
}