/* Figma-Style Design System with Light/Dark Mode */
/* Accessibility: WCAG AA compliant color contrasts */

:root {
  /* Light Mode Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7f7f7;
  --color-bg-tertiary: #efefef;
  
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  
  --color-border-primary: #e0e0e0;
  --color-border-secondary: #f0f0f0;
  
  /* Accent Colors (Figma-style pastels) */
  --color-accent-blue: #5b7cff;
  --color-accent-purple: #a855f7;
  --color-accent-pink: #ec4899;
  --color-accent-green: #10b981;
  --color-accent-orange: #f97316;
  --color-accent-cyan: #06b6d4;
  
  /* Interactive Colors */
  --color-primary: #5b7cff;
  --color-primary-hover: #4563dd;
  --color-secondary: #f0f0f0;
  --color-secondary-hover: #e0e0e0;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-success: #10b981;
  --color-success-hover: #059669;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root.dark,
  :root[data-theme="dark"] {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #242424;
    --color-bg-tertiary: #2d2d2d;
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-text-tertiary: #808080;
    
    --color-border-primary: #3a3a3a;
    --color-border-secondary: #2d2d2d;
    
    --color-secondary: #2d2d2d;
    --color-secondary-hover: #3a3a3a;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  }
}

/* Light Mode (Explicit) */
:root[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f7f7f7;
  --color-bg-tertiary: #efefef;
  
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  
  --color-border-primary: #e0e0e0;
  --color-border-secondary: #f0f0f0;
  
  --color-secondary: #f0f0f0;
  --color-secondary-hover: #e0e0e0;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

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

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

code {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: var(--font-size-sm);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  white-space: nowrap;
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-secondary-hover);
}

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

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-danger-hover);
}

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

.btn-success:hover:not(:disabled) {
  background-color: var(--color-success-hover);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* ============================================
   Forms
   ============================================ */

.form-group {
  margin-bottom: var(--spacing-lg);
}

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

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  width: 100%;
  max-width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(91, 124, 255, 0.1);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

/* ============================================
   Cards & Containers
   ============================================ */

.card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-primary);
  margin-bottom: var(--spacing-lg);
}

.card-body {
  padding: var(--spacing-md) 0;
}

.card-footer {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-primary);
  margin-top: var(--spacing-lg);
}

/* ============================================
   Layout
   ============================================ */

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

.container-sm {
  max-width: 600px;
}

.container-lg {
  max-width: 1400px;
}

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

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

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

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

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

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
}

.flex-wrap {
  flex-wrap: wrap;
}

/* ============================================
   Utilities
   ============================================ */

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

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

.px-md { padding: 0 var(--spacing-md); }
.py-md { padding: var(--spacing-md) 0; }

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

.space-y-2 > * + * { margin-top: var(--spacing-md); }

.text-muted { color: var(--color-text-secondary); }
.text-subtle { color: var(--color-text-tertiary); }
.text-primary { color: var(--color-primary); }

.text-small { font-size: var(--font-size-sm); }
.text-large { font-size: var(--font-size-lg); }

.text-center { text-align: center; }
.text-right { text-align: right; }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.font-mono { font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace; }

.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-accent-blue);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.badge-success { background-color: var(--color-success); }
.badge-danger { background-color: var(--color-danger); }
.badge-purple { background-color: var(--color-accent-purple); }
.badge-pink { background-color: var(--color-accent-pink); }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .flex {
    flex-direction: column;
  }
  
  .flex-between {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fade-in var(--transition-base);
}

/* ============================================
   Skip Link for Accessibility
   ============================================ */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}