/**
 * Tsharok LMS Design System
 * Unified styles for consistent UI/UX across all pages
 */

/* ============================================ */
/* CSS Variables - Design Tokens */
/* ============================================ */

:root {
    /* Primary Colors */
    --color-primary: #4F46E5; /* Indigo-600 */
    --color-primary-dark: #4338CA; /* Indigo-700 */
    --color-primary-light: #6366F1; /* Indigo-500 */
    --color-primary-lighter: #818CF8; /* Indigo-400 */
    
    /* Secondary Colors */
    --color-secondary: #7C3AED; /* Violet-600 */
    --color-secondary-dark: #6D28D9; /* Violet-700 */
    
    /* Success Colors */
    --color-success: #10B981; /* Green-500 */
    --color-success-dark: #059669; /* Green-600 */
    --color-success-light: #34D399; /* Green-400 */
    
    /* Warning Colors */
    --color-warning: #F59E0B; /* Amber-500 */
    --color-warning-dark: #D97706; /* Amber-600 */
    
    /* Error Colors */
    --color-error: #EF4444; /* Red-500 */
    --color-error-dark: #DC2626; /* Red-600 */
    
    /* Info Colors */
    --color-info: #3B82F6; /* Blue-500 */
    --color-info-dark: #2563EB; /* Blue-600 */
    
    /* 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;
    
    /* Spacing */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-2xl: 3rem;     /* 48px */
    --spacing-3xl: 4rem;     /* 64px */
    
    /* Border Radius */
    --radius-sm: 0.25rem;    /* 4px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-2xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
    
    /* Z-Index Layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

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

* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Cairo', 'Tajawal', 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--color-gray-50);
    color: var(--color-gray-900);
    line-height: 1.6;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-gray-900);
}

h1 { font-size: 2.25rem; } /* 36px */
h2 { font-size: 1.875rem; } /* 30px */
h3 { font-size: 1.5rem; }   /* 24px */
h4 { font-size: 1.25rem; }  /* 20px */
h5 { font-size: 1.125rem; } /* 18px */
h6 { font-size: 1rem; }     /* 16px */

@media (max-width: 768px) {
    h1 { font-size: 1.875rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background-color: var(--color-gray-100);
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-gray-200);
}

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

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

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

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

.btn-ghost {
    background-color: transparent;
    color: var(--color-gray-700);
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-gray-100);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* ============================================ */
/* Cards */
/* ============================================ */

.card {
    background-color: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
    font-weight: 600;
    color: var(--color-gray-900);
}

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

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
    background-color: var(--color-gray-50);
}

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

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-700);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--color-gray-900);
    background-color: white;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background-color: var(--color-gray-100);
    cursor: not-allowed;
}

.form-error {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--color-error);
}

.form-helper {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

/* ============================================ */
/* Alerts */
/* ============================================ */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    margin-bottom: var(--spacing-md);
}

.alert-success {
    background-color: #D1FAE5;
    border-color: var(--color-success);
    color: #065F46;
}

.alert-error {
    background-color: #FEE2E2;
    border-color: var(--color-error);
    color: #991B1B;
}

.alert-warning {
    background-color: #FEF3C7;
    border-color: var(--color-warning);
    color: #92400E;
}

.alert-info {
    background-color: #DBEAFE;
    border-color: var(--color-info);
    color: #1E40AF;
}

/* ============================================ */
/* Badges */
/* ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary {
    background-color: #EEF2FF;
    color: var(--color-primary);
}

.badge-success {
    background-color: #D1FAE5;
    color: #065F46;
}

.badge-error {
    background-color: #FEE2E2;
    color: #991B1B;
}

.badge-warning {
    background-color: #FEF3C7;
    color: #92400E;
}

/* ============================================ */
/* Loading States */
/* ============================================ */

.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner 0.75s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================ */
/* Transitions & Animations */
/* ============================================ */

.fade-in {
    animation: fadeIn var(--transition-slow) ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-up {
    animation: slideUp var(--transition-slow) ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scale-in {
    animation: scaleIn var(--transition-base) ease-out;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ============================================ */
/* Utility Classes */
/* ============================================ */

.gradient-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

.gradient-success {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-effect {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 640px) {
    .hide-mobile { display: none !important; }
}

@media (min-width: 641px) {
    .show-mobile { display: none !important; }
}

@media (max-width: 768px) {
    .hide-tablet { display: none !important; }
}

@media (min-width: 769px) {
    .show-tablet { display: none !important; }
}

/* ============================================ */
/* RTL Support */
/* ============================================ */

[dir="rtl"] .btn,
[dir="rtl"] .card {
    text-align: right;
}

[dir="rtl"] .alert {
    border-left: none;
    border-right: 4px solid;
}

/* ============================================ */
/* Print Styles */
/* ============================================ */

@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        background-color: white;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--color-gray-300);
    }
}