:root {
  /* Colors */
  --bg-color: #121212;
  --surface-color: #1e1e1e;
  --surface-hover: #2d2d2d;
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --secondary-color: #475569;
  --secondary-hover: #334155;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --border-color: #333333;
  --error-color: #ef4444;
  --success-color: #10b981;
  --accent-color: #f59e0b;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  
  /* Borders */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.5;
  margin: 0;
  padding: var(--spacing-md);
}

/* Common Reset/Utilities */
* {
  box-sizing: border-box;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

button {
  cursor: pointer;
  font-family: inherit;
}

/* Common Container */
.container-main {
  max-width: 1200px;
  margin: 0 auto;
  background-color: var(--surface-color);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}

/* Common Form Elements */
input, select, textarea {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

/* Common Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-weight: 500;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: var(--secondary-hover);
  text-decoration: none;
}