/* ============================================
   Reyous Design System - Glass.photo Inspired
   ============================================ */

/* ============================================
   CONFIGURABLE FONTS
   
   To change fonts, modify the --font-primary and --font-secondary
   variables below. Popular clean options:
   
   Modern Sans:
   - Inter: 'Inter', sans-serif
   - Space Grotesk: 'Space Grotesk', sans-serif
   - DM Sans: 'DM Sans', sans-serif
   - Work Sans: 'Work Sans', sans-serif
   
   Classic:
   - Helvetica: 'Helvetica Neue', Helvetica, Arial, sans-serif
   - System: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif
   
   ============================================ */

:root {
  /* TYPOGRAPHY CONFIGURATION */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  
  /* FONT SCALE */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.25rem;    /* 36px */
  --text-5xl: 3rem;       /* 48px */
  
  /* FONT WEIGHTS */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* SPACING SYSTEM - 4px base unit */
  --space-0: 0;
  --space-1: 0.25rem;     /* 4px */
  --space-2: 0.5rem;      /* 8px */
  --space-3: 0.75rem;     /* 12px */
  --space-4: 1rem;        /* 16px */
  --space-5: 1.25rem;     /* 20px */
  --space-6: 1.5rem;      /* 24px */
  --space-8: 2rem;        /* 32px */
  --space-10: 2.5rem;     /* 40px */
  --space-12: 3rem;       /* 48px */
  --space-16: 4rem;       /* 64px */
  --space-20: 5rem;       /* 80px */
  --space-24: 6rem;       /* 96px */
  
  /* BORDER RADIUS */
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius: 0.25rem;       /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-full: 9999px;
  
  /* SHADOWS */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* LIGHT THEME COLORS */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* SEMANTIC COLORS - LIGHT THEME */
  --color-background: var(--color-white);
  --color-background-secondary: var(--color-gray-50);
  --color-background-tertiary: var(--color-gray-100);
  
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-tertiary: var(--color-gray-500);
  --color-text-muted: var(--color-gray-400);
  
  --color-border: var(--color-gray-200);
  --color-border-secondary: var(--color-gray-300);
  
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-light: #dbeafe;
  
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-error: #ef4444;
  --color-error-light: #fee2e2;
}

/* DARK THEME */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: var(--color-gray-900);
    --color-background-secondary: var(--color-gray-800);
    --color-background-tertiary: var(--color-gray-700);
    
    --color-text-primary: var(--color-gray-50);
    --color-text-secondary: var(--color-gray-300);
    --color-text-tertiary: var(--color-gray-400);
    --color-text-muted: var(--color-gray-500);
    
    --color-border: var(--color-gray-700);
    --color-border-secondary: var(--color-gray-600);
    
    --color-accent: #60a5fa;
    --color-accent-hover: #3b82f6;
    --color-accent-light: #1e3a8a;
    
    --color-success: #34d399;
    --color-success-light: #064e3b;
    --color-warning: #fbbf24;
    --color-warning-light: #78350f;
    --color-error: #f87171;
    --color-error-light: #7f1d1d;
  }
}

/* MANUAL DARK MODE CLASS */
.dark {
  --color-background: var(--color-gray-900);
  --color-background-secondary: var(--color-gray-800);
  --color-background-tertiary: var(--color-gray-700);
  
  --color-text-primary: var(--color-gray-50);
  --color-text-secondary: var(--color-gray-300);
  --color-text-tertiary: var(--color-gray-400);
  --color-text-muted: var(--color-gray-500);
  
  --color-border: var(--color-gray-700);
  --color-border-secondary: var(--color-gray-600);
  
  --color-accent: #60a5fa;
  --color-accent-hover: #3b82f6;
  --color-accent-light: #1e3a8a;
  
  --color-success: #34d399;
  --color-success-light: #064e3b;
  --color-warning: #fbbf24;
  --color-warning-light: #78350f;
  --color-error: #f87171;
  --color-error-light: #7f1d1d;
}

/* ============================================
   BASE STYLES
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4) 0;
  font-family: var(--font-primary);
  font-weight: var(--font-semibold);
  line-height: 1.25;
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin: 0 0 var(--space-4) 0;
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease-in-out;
}

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

/* Typography Utilities */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }

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

.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* ============================================
   LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-sm {
  width: 100%;
  max-width: 768px;
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-xs {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

/* ============================================
   FLEXBOX UTILITIES
   ============================================ */

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-none { flex: none; }

/* Gap utilities */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ============================================
   SPACING UTILITIES
   ============================================ */

/* Margin */
.m-0 { margin: 0; }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }
.mt-20 { margin-top: var(--space-20); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Padding */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.pt-4 { padding-top: var(--space-4); }
.pt-6 { padding-top: var(--space-6); }
.pt-8 { padding-top: var(--space-8); }

.pb-4 { padding-bottom: var(--space-4); }
.pb-6 { padding-bottom: var(--space-6); }
.pb-8 { padding-bottom: var(--space-8); }

/* ============================================
   WIDTH & HEIGHT
   ============================================ */

.w-full { width: 100%; }
.w-auto { width: auto; }
.h-full { height: 100%; }
.h-auto { height: auto; }

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4);
  min-height: 64px;
}

.nav-brand {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color 0.15s ease-in-out;
}

.nav-brand:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  transition: all 0.15s ease-in-out;
}

.nav-link:hover {
  color: var(--color-text-primary);
  background-color: var(--color-background-secondary);
}

.nav-link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
}

/* Mobile Navigation */
.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--text-lg);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius);
  transition: background-color 0.15s ease-in-out;
}

.nav-mobile-toggle:hover {
  background-color: var(--color-background-secondary);
}

@media (max-width: 768px) {
  .nav-mobile-toggle {
    display: block;
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .nav-link {
    padding: var(--space-3) var(--space-4);
    width: 100%;
    text-align: left;
  }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  font-family: inherit;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background-color: transparent;
  color: currentColor;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  white-space: nowrap;
  user-select: none;
}

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

.btn:disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* Button Variants */
.btn-primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

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

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

.btn-secondary:hover {
  background-color: var(--color-background-tertiary);
  border-color: var(--color-border-secondary);
}

.btn-ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-text-secondary);
}

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

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

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

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.15s ease-in-out;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-background-secondary);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-background-secondary);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.form-input,
.form-textarea,
.form-select {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-family: inherit;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

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

.form-error {
  color: var(--color-error);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.form-input.error,
.form-textarea.error,
.form-select.error {
  border-color: var(--color-error);
}

.form-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Form row for side-by-side fields */
.form-row {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.form-row .form-group {
  margin-bottom: 0;
}

.form-group-half {
  flex: 1;
}

@media (max-width: 480px) {
  .form-row {
    flex-direction: column;
    gap: 0;
  }
  
  .form-row .form-group {
    margin-bottom: var(--space-6);
  }
}

/* Form fieldset for grouped fields */
.form-fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin: 0 0 var(--space-6) 0;
  background-color: var(--color-background-secondary);
}

.form-legend {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  padding: 0 var(--space-2);
  margin-bottom: var(--space-4);
}

.form-legend-hint {
  font-weight: var(--font-normal);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

/* Or divider */
.form-divider {
  display: flex;
  align-items: center;
  margin: var(--space-4) 0;
}

.form-divider::before,
.form-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

.form-divider-text {
  padding: 0 var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-medium);
}

/* Alert styles */
.alert {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}

.alert-error {
  background-color: var(--color-error-light);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

/* ============================================
   BADGES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.badge-success {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

.badge-error {
  background-color: var(--color-error-light);
  color: var(--color-error);
}

.badge-secondary {
  background-color: var(--color-background-tertiary);
  color: var(--color-text-tertiary);
}

/* ============================================
   SEGMENTED CONTROLS (iOS-style)
   ============================================ */

.segmented-control {
  display: inline-flex;
  background-color: var(--color-background-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
  gap: var(--space-1);
  box-shadow: var(--shadow-sm);
}

.segmented-control-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  font-family: inherit;
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--color-text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  white-space: nowrap;
  user-select: none;
  min-width: 60px;
}

.segmented-control-item:hover {
  color: var(--color-text-primary);
  background-color: var(--color-background-tertiary);
}

.segmented-control-item.active {
  background-color: var(--color-background);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
  font-weight: var(--font-semibold);
}

.segmented-control-item:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Segmented Control Sizes */
.segmented-control-sm {
  padding: 2px;
  gap: 2px;
}

.segmented-control-sm .segmented-control-item {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  min-width: 50px;
}

.segmented-control-lg {
  padding: var(--space-2);
  gap: var(--space-1);
}

.segmented-control-lg .segmented-control-item {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  min-width: 80px;
}

/* Content panels for segmented controls */
.segmented-content {
  margin-top: var(--space-6);
}

.segmented-panel {
  display: none;
}

.segmented-panel.active {
  display: block;
  animation: fadeIn 0.2s ease-out;
}

/* ============================================
   GRID LAYOUTS
   ============================================ */

.grid {
  display: grid;
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.col-span-1 { grid-column: span 1 / span 1; }
.col-span-2 { grid-column: span 2 / span 2; }
.col-span-3 { grid-column: span 3 / span 3; }
.col-span-4 { grid-column: span 4 / span 4; }

/* ============================================
   ITEM COMPONENTS
   ============================================ */

.item-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.item-card {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
  color: inherit;
  display: block;
}

.item-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-border-secondary);
}

.item-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-background-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.item-content {
  padding: var(--space-6);
}

.item-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.item-description {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}

.item-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* ============================================
   UTILITIES
   ============================================ */

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

.top-0 { top: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }

.top-3 { top: var(--space-3); }
.right-3 { right: var(--space-3); }

.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-50 { z-index: 50; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 640px) {
  .container,
  .container-sm,
  .container-xs {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }
  
  .item-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .flex-col-mobile {
    flex-direction: column;
  }
  
  .text-center-mobile {
    text-align: center;
  }
  
  .segmented-control {
    flex-direction: column;
    align-items: stretch;
  }
  
  .segmented-control-item {
    text-align: center;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

.transition {
  transition: all 0.15s ease-in-out;
}

/* ============================================
   FOCUS STYLES
   ============================================ */

.focus\:outline-none:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
}

.focus\:ring:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   SEARCH COMPONENTS
   ============================================ */

.search-container {
  position: relative;
  width: 100%;
}

.search-loading {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-results {
  margin-top: var(--space-2);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-height: 400px;
  overflow-y: auto;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top: 2px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* User card styling for search results */
.user-card {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.15s ease-in-out;
}

.user-card:last-child {
  border-bottom: none;
}

.user-card:hover {
  background-color: var(--color-background-secondary);
}

.user-header {
  margin-bottom: var(--space-3);
}

.user-avatar {
  flex-shrink: 0;
}

.user-name {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.user-username {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.user-actions {
  display: flex;
  justify-content: flex-end;
}

/* Utility classes */
.w-12 { width: 3rem; }
.h-12 { height: 3rem; }
.rounded-full { border-radius: 50%; }
.bg-accent { background-color: var(--color-accent); }
.text-white { color: white; }
.py-8 { padding-top: var(--space-20); padding-bottom: var(--space-20); }