/* ============================================
   MODERN DESIGN SYSTEM
   ============================================ */

:root {
    /* Colors */
    --ds-primary: #6366f1;
    --ds-primary-dark: #4f46e5;
    --ds-primary-light: #818cf8;
    --ds-secondary: #8b5cf6;
    --ds-accent: #ec4899;
    --ds-success: #10b981;
    --ds-warning: #f59e0b;
    --ds-danger: #ef4444;
    --ds-info: #3b82f6;
    
    /* Neutrals */
    --ds-gray-50: #f9fafb;
    --ds-gray-100: #f3f4f6;
    --ds-gray-200: #e5e7eb;
    --ds-gray-300: #d1d5db;
    --ds-gray-400: #9ca3af;
    --ds-gray-500: #6b7280;
    --ds-gray-600: #4b5563;
    --ds-gray-700: #374151;
    --ds-gray-800: #1f2937;
    --ds-gray-900: #111827;
    
    /* Text */
    --ds-text-primary: #111827;
    --ds-text-secondary: #6b7280;
    --ds-text-muted: #9ca3af;
    --ds-text-inverse: #ffffff;
    
    /* Backgrounds */
    --ds-bg-primary: #ffffff;
    --ds-bg-secondary: #f9fafb;
    --ds-bg-tertiary: #f3f4f6;
    --ds-bg-dark: #111827;
    
    /* Borders */
    --ds-border-light: #e5e7eb;
    --ds-border-medium: #d1d5db;
    --ds-border-dark: #9ca3af;
    
    /* Shadows */
    --ds-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --ds-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --ds-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --ds-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing */
    --ds-space-xs: 0.5rem;
    --ds-space-sm: 0.75rem;
    --ds-space-md: 1rem;
    --ds-space-lg: 1.5rem;
    --ds-space-xl: 2rem;
    --ds-space-2xl: 3rem;
    --ds-space-3xl: 4rem;
    
    /* Typography */
    --ds-font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --ds-font-size-xs: 0.75rem;
    --ds-font-size-sm: 0.875rem;
    --ds-font-size-base: 1rem;
    --ds-font-size-lg: 1.125rem;
    --ds-font-size-xl: 1.25rem;
    --ds-font-size-2xl: 1.5rem;
    --ds-font-size-3xl: 1.875rem;
    --ds-font-size-4xl: 2.25rem;
    --ds-font-size-5xl: 3rem;
    
    /* Border Radius */
    --ds-radius-sm: 0.375rem;
    --ds-radius-md: 0.5rem;
    --ds-radius-lg: 0.75rem;
    --ds-radius-xl: 1rem;
    --ds-radius-full: 9999px;
    
    /* Transitions */
    --ds-transition-fast: 150ms ease;
    --ds-transition-base: 200ms ease;
    --ds-transition-slow: 300ms ease;
}

/* ============================================
   GLOBAL RESET & BASE
   ============================================ */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--ds-font-sans);
    color: var(--ds-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--ds-text-primary);
    margin-bottom: var(--ds-space-md);
}

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

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

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

a:hover {
    color: var(--ds-primary-dark);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ds-space-xs);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    font-size: var(--ds-font-size-base);
    border-radius: var(--ds-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--ds-transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--ds-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--ds-shadow-md);
    color: white;
}

.btn-secondary {
    background: var(--ds-gray-200);
    color: var(--ds-text-primary);
}

.btn-secondary:hover {
    background: var(--ds-gray-300);
    color: var(--ds-text-primary);
}

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

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

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

.card {
    background: var(--ds-bg-primary);
    border-radius: var(--ds-radius-lg);
    box-shadow: var(--ds-shadow-sm);
    border: 1px solid var(--ds-border-light);
    overflow: hidden;
    transition: all var(--ds-transition-base);
}

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

.card-img-top {
    width: 100%;
    height: auto;
    display: block;
}

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

.card-title {
    font-size: var(--ds-font-size-lg);
    font-weight: 600;
    margin-bottom: var(--ds-space-sm);
    color: var(--ds-text-primary);
}

.card-text {
    color: var(--ds-text-secondary);
    font-size: var(--ds-font-size-sm);
}

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

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.75rem;
    font-size: var(--ds-font-size-xs);
    font-weight: 500;
    border-radius: var(--ds-radius-full);
    background: var(--ds-gray-200);
    color: var(--ds-text-primary);
}

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

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

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

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--ds-font-size-base);
    border: 1px solid var(--ds-border-medium);
    border-radius: var(--ds-radius-md);
    background: var(--ds-bg-primary);
    color: var(--ds-text-primary);
    transition: all var(--ds-transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--ds-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--ds-space-xs);
    color: var(--ds-text-primary);
}

/* ============================================
   BREADCRUMBS
   ============================================ */

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0 0 var(--ds-space-lg) 0;
    background: transparent;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    padding: 0 var(--ds-space-sm);
    color: var(--ds-text-muted);
}

.breadcrumb-item a {
    color: var(--ds-text-secondary);
    font-size: var(--ds-font-size-sm);
}

.breadcrumb-item.active {
    color: var(--ds-text-primary);
    font-weight: 500;
}

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

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--ds-space-xs); }
.mb-2 { margin-bottom: var(--ds-space-sm); }
.mb-3 { margin-bottom: var(--ds-space-md); }
.mb-4 { margin-bottom: var(--ds-space-lg); }
.mb-5 { margin-bottom: var(--ds-space-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--ds-space-xs); }
.mt-2 { margin-top: var(--ds-space-sm); }
.mt-3 { margin-top: var(--ds-space-md); }
.mt-4 { margin-top: var(--ds-space-lg); }
.mt-5 { margin-top: var(--ds-space-xl); }

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

/* ============================================
   PAGINATION
   ============================================ */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.page-item {
    display: inline-block;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0.5rem 0.75rem;
    color: var(--ds-text-primary);
    background: white;
    border: 1px solid var(--ds-border-light);
    border-radius: var(--ds-radius-md);
    text-decoration: none;
    transition: all var(--ds-transition-fast);
    font-weight: 500;
}

.page-link:hover {
    background: var(--ds-primary);
    color: white;
    border-color: var(--ds-primary);
    transform: translateY(-2px);
}

.page-item.active .page-link {
    background: var(--ds-primary);
    color: white;
    border-color: var(--ds-primary);
}

.page-item.disabled .page-link {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
    width: 100%;
}

.pagination-info {
    font-size: 0.875rem;
    color: var(--ds-text-secondary);
    text-align: center;
}

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

@media (max-width: 768px) {
    h1 { font-size: var(--ds-font-size-3xl); }
    h2 { font-size: var(--ds-font-size-2xl); }
    h3 { font-size: var(--ds-font-size-xl); }
    
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: var(--ds-font-size-sm);
    }
    
    .page-link {
        min-width: 36px;
        height: 36px;
        padding: 0.375rem 0.625rem;
        font-size: var(--ds-font-size-sm);
    }
}