/* ============================================
   LTIA Design System
   Based on Platform Sync Wizard HiFi Designs
   ============================================ */

/* ============================================
   1. CSS VARIABLES - Design Tokens
   ============================================ */
:root {
    /* Color Palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-darker: #1e3a8a;
    --color-primary-light: #3b82f6;
    --color-primary-lighter: #60a5fa;
    
    --color-secondary: #6366f1;
    --color-secondary-dark: #4f46e5;
    --color-secondary-light: #818cf8;
    
    --color-success: #10b981;
    --color-success-dark: #059669;
    --color-success-light: #34d399;
    
    --color-warning: #f59e0b;
    --color-warning-dark: #d97706;
    --color-warning-light: #fbbf24;
    
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;
    --color-danger-light: #f87171;
    
    --color-info: #3b82f6;
    --color-info-dark: #2563eb;
    --color-info-light: #60a5fa;
    
    /* Accent Colors */
    --color-purple: #7c3aed;
    --color-purple-light: #8b5cf6;
    --color-orange: #ea580c;
    --color-orange-light: #f97316;
    
    /* Neutral Colors */
    --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;
    
    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    
    --color-bg-blue-light: #f0f9ff;
    --color-bg-blue: #dbeafe;
    --color-bg-green-light: #f0fdf4;
    --color-bg-green: #d1fae5;
    --color-bg-purple-light: #faf5ff;
    --color-bg-purple: #ede9fe;
    --color-bg-orange-light: #fff7ed;
    --color-bg-orange: #fed7aa;
    
    /* Border Colors */
    --color-border-light: #f3f4f6;
    --color-border: #e5e7eb;
    --color-border-medium: #d1d5db;
    --color-border-dark: #9ca3af;
    --color-border-blue: #bfdbfe;
    
    /* Text Colors */
    --color-text-primary: #111827;
    --color-text-secondary: #374151;
    --color-text-tertiary: #6b7280;
    --color-text-quaternary: #9ca3af;
    --color-text-link: #2563eb;
    
    /* Spacing Scale */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing-md: 0.75rem;    /* 12px */
    --spacing-lg: 1rem;       /* 16px */
    --spacing-xl: 1.25rem;    /* 20px */
    --spacing-2xl: 1.5rem;    /* 24px */
    --spacing-3xl: 2rem;      /* 32px */
    --spacing-4xl: 2.5rem;    /* 40px */
    --spacing-5xl: 3rem;      /* 48px */
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.15);
    
    /* Focus Rings */
    --focus-ring-primary: 0 0 0 3px rgba(37, 99, 235, 0.1);
    --focus-ring-success: 0 0 0 3px rgba(16, 185, 129, 0.1);
    --focus-ring-danger: 0 0 0 3px rgba(239, 68, 68, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.75rem;     /* 28px */
    --font-size-4xl: 2rem;        /* 32px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.6;
}

/* ============================================
   2. GRADIENTS
   ============================================ */
.gradient-primary {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
}

.gradient-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.gradient-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.gradient-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.gradient-purple {
    background: linear-gradient(135deg, #7c3aed 0%, #6366f1 100%);
}

.gradient-blue-light {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

/* ============================================
   3. CARD COMPONENTS
   ============================================ */
.card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-base);
}

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

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-2xl);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-sm);
}

.card-body {
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
}

.card-footer {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border-light);
}

/* Card Variants */
.card-elevated {
    box-shadow: var(--shadow-md);
    border: none;
}

.card-blue {
    background: var(--color-bg-blue-light);
    border-color: var(--color-border-blue);
}

.card-green {
    background: var(--color-bg-green-light);
    border-color: #bbf7d0;
}

.card-purple {
    background: var(--color-bg-purple-light);
    border-color: #ddd6fe;
}

.card-orange {
    background: var(--color-bg-orange-light);
    border-color: #fed7aa;
}

/* ============================================
   4. BUTTON COMPONENTS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    line-height: 1;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    border: none;
    white-space: nowrap;
}

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    height: 36px;
}

.btn-md {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-base);
    height: 44px;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-3xl);
    font-size: var(--font-size-lg);
    height: 52px;
}

.btn-xl {
    padding: var(--spacing-xl) var(--spacing-4xl);
    font-size: var(--font-size-lg);
    height: 56px;
}

.btn-full {
    width: 100%;
}

/* Primary Button */
.btn-primary {
    background: var(--color-primary-darker);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    box-shadow: 0 4px 12px rgba(30, 58, 138, 0.3);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
    background: white;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-medium);
}

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

/* Success Button */
.btn-success {
    background: var(--color-success);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: var(--color-success-dark);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* Danger Button */
.btn-danger {
    background: var(--color-danger);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-danger-dark);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* Warning Button */
.btn-warning {
    background: var(--color-warning);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: var(--color-warning-dark);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

/* Outline Variants */
.btn-outline-primary {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--color-bg-blue-light);
}

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

.btn-outline-danger:hover:not(:disabled) {
    background: #fef2f2;
}

/* Ghost Variants */
.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

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

/* Disabled State */
.btn:disabled {
    background: var(--color-gray-300);
    color: var(--color-gray-400);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn-secondary:disabled,
.btn-outline-primary:disabled,
.btn-outline-danger:disabled,
.btn-ghost:disabled {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
    color: var(--color-gray-400);
}

/* ============================================
   5. ICON COMPONENTS
   ============================================ */
.icon-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.icon-wrapper-sm {
    width: 32px;
    height: 32px;
    font-size: 1rem;
}

.icon-wrapper-md {
    width: 40px;
    height: 40px;
    font-size: 1.125rem;
}

.icon-wrapper-lg {
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
}

.icon-wrapper-xl {
    width: 64px;
    height: 64px;
    font-size: 2rem;
}

/* Icon Colors */
.icon-blue {
    background: var(--color-bg-blue);
    color: var(--color-primary);
}

.icon-green {
    background: var(--color-bg-green);
    color: var(--color-success-dark);
}

.icon-purple {
    background: var(--color-bg-purple);
    color: var(--color-purple);
}

.icon-orange {
    background: var(--color-bg-orange);
    color: var(--color-orange);
}

.icon-gray {
    background: var(--color-bg-secondary);
    color: var(--color-gray-600);
}

/* ============================================
   6. BADGE COMPONENTS
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: var(--color-bg-blue);
    color: var(--color-primary-dark);
}

.badge-success {
    background: var(--color-bg-green);
    color: var(--color-success-dark);
}

.badge-warning {
    background: var(--color-bg-orange);
    color: var(--color-warning-dark);
}

.badge-danger {
    background: #fee2e2;
    color: var(--color-danger-dark);
}

.badge-gray {
    background: var(--color-bg-tertiary);
    color: var(--color-gray-600);
}

/* ============================================
   7. FORM COMPONENTS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-2xl);
}

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

.form-label-required::after {
    content: '*';
    color: var(--color-danger);
    margin-left: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    transition: all var(--transition-base);
}

.form-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: var(--color-bg-primary);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 12px;
    padding-right: 2.5rem;
}

.form-select option {
    padding: 8px;
    background-color: white;
    color: var(--color-text-primary);
}

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

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--focus-ring-primary);
}

.form-input-lg {
    height: 48px;
    padding: var(--spacing-lg) var(--spacing-xl);
}

.form-select.form-input-lg {
    padding-right: 2.5rem;
}

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

.form-helper {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-sm);
}

.form-error {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-danger);
    margin-top: var(--spacing-sm);
}

.form-input-error {
    border-color: var(--color-danger);
}

.form-input-error:focus {
    box-shadow: var(--focus-ring-danger);
}

/* Checkbox */
.checkbox-wrapper {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.checkbox-input {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.checkbox-label {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
}

/* ============================================
   8. ALERT COMPONENTS
   ============================================ */
.alert {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.alert-icon {
    flex-shrink: 0;
    font-size: var(--font-size-xl);
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
}

.alert-message {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
}

.alert-info {
    background: var(--color-bg-blue-light);
    border-color: var(--color-border-blue);
    color: var(--color-primary-darker);
}

.alert-success {
    background: var(--color-bg-green-light);
    border-color: #bbf7d0;
    color: #065f46;
}

.alert-warning {
    background: var(--color-bg-orange-light);
    border-color: var(--color-bg-orange);
    color: #92400e;
}

.alert-danger {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}

/* ============================================
   9. LIST COMPONENTS
   ============================================ */
.list-group {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.list-item {
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: background var(--transition-fast);
}

.list-item:last-child {
    border-bottom: none;
}

.list-item:hover {
    background: var(--color-bg-secondary);
}

.list-item-clickable {
    cursor: pointer;
}

.list-item-icon {
    flex-shrink: 0;
}

.list-item-content {
    flex: 1;
    min-width: 0;
}

.list-item-title {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.list-item-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.list-item-action {
    flex-shrink: 0;
}

/* ============================================
   10. EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-5xl) var(--spacing-3xl);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-2xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--color-gray-400);
}

.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state-description {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-3xl);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   11. LOADING STATES
   ============================================ */
.spinner {
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: 20px;
    height: 20px;
}

.spinner-md {
    width: 32px;
    height: 32px;
}

.spinner-lg {
    width: 48px;
    height: 48px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

/* ============================================
   12. UTILITY CLASSES
   ============================================ */
/* Spacing */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-2xl); }
.mt-4 { margin-top: var(--spacing-3xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-2xl); }
.mb-4 { margin-bottom: var(--spacing-3xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-lg); }
.p-3 { padding: var(--spacing-2xl); }
.p-4 { padding: var(--spacing-3xl); }

/* Text */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }

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

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

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-link { color: var(--color-text-link); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }

/* Display */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-lg); }
.gap-3 { gap: var(--spacing-2xl); }

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

/* Borders */
.border { border: 1px solid var(--color-border); }
.border-t { border-top: 1px solid var(--color-border); }
.border-b { border-bottom: 1px solid var(--color-border); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* ============================================
   13. RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 768px) {
    :root {
        --spacing-3xl: 1.5rem;
        --spacing-4xl: 2rem;
        --spacing-5xl: 2.5rem;
    }
}