/**
 * Base CSS Structure
 * البنية الأساسية للتصميم
 * 
 * @package FitnessCoachPro
 * @version 1.0.0
 */

/* ============================================================================
   CSS Variables - المتغيرات
   ============================================================================ */

:root {
    /* Colors - الألوان */
    --fcp-primary: #6366f1;
    --fcp-primary-dark: #4f46e5;
    --fcp-primary-light: #818cf8;
    --fcp-secondary: #10b981;
    --fcp-secondary-dark: #059669;
    --fcp-accent: #f59e0b;
    --fcp-accent-dark: #d97706;
    
    /* Status Colors */
    --fcp-success: #10b981;
    --fcp-warning: #f59e0b;
    --fcp-error: #ef4444;
    --fcp-info: #3b82f6;
    
    /* Grays */
    --fcp-gray-50: #f9fafb;
    --fcp-gray-100: #f3f4f6;
    --fcp-gray-200: #e5e7eb;
    --fcp-gray-300: #d1d5db;
    --fcp-gray-400: #9ca3af;
    --fcp-gray-500: #6b7280;
    --fcp-gray-600: #4b5563;
    --fcp-gray-700: #374151;
    --fcp-gray-800: #1f2937;
    --fcp-gray-900: #111827;
    
    /* Background */
    --fcp-bg-primary: #ffffff;
    --fcp-bg-secondary: #f9fafb;
    --fcp-bg-tertiary: #f3f4f6;
    
    /* Text */
    --fcp-text-primary: #111827;
    --fcp-text-secondary: #6b7280;
    --fcp-text-tertiary: #9ca3af;
    
    /* Spacing - المسافات */
    --fcp-spacing-xs: 0.25rem;   /* 4px */
    --fcp-spacing-sm: 0.5rem;    /* 8px */
    --fcp-spacing-md: 1rem;      /* 16px */
    --fcp-spacing-lg: 1.5rem;     /* 24px */
    --fcp-spacing-xl: 2rem;      /* 32px */
    --fcp-spacing-2xl: 3rem;     /* 48px */
    --fcp-spacing-3xl: 4rem;     /* 64px */
    
    /* Border Radius */
    --fcp-radius-sm: 0.375rem;   /* 6px */
    --fcp-radius-md: 0.5rem;     /* 8px */
    --fcp-radius-lg: 0.75rem;    /* 12px */
    --fcp-radius-xl: 1rem;       /* 16px */
    --fcp-radius-full: 9999px;
    
    /* Shadows */
    --fcp-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --fcp-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --fcp-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --fcp-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --fcp-transition-fast: 150ms ease-in-out;
    --fcp-transition-base: 300ms ease-in-out;
    --fcp-transition-slow: 500ms ease-in-out;
    
    /* Z-index */
    --fcp-z-dropdown: 1000;
    --fcp-z-sticky: 1020;
    --fcp-z-fixed: 1030;
    --fcp-z-modal-backdrop: 1040;
    --fcp-z-modal: 1050;
    --fcp-z-popover: 1060;
    --fcp-z-tooltip: 1070;
    
    /* Layout */
    --fcp-container-max-width: 1200px;
    --fcp-bottom-nav-height: 64px;
    --fcp-header-height: 60px;
}

/* ============================================================================
   Reset & Base Styles
   ============================================================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    line-height: 1.6;
    color: var(--fcp-text-primary);
    background-color: var(--fcp-bg-secondary);
    
    text-align: end;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--fcp-text-primary);
    margin-bottom: var(--fcp-spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

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

/* ============================================================================
   Grid & Flexbox Utilities
   ============================================================================ */

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

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

.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)); }

@media (max-width: 768px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: repeat(1, minmax(0, 1fr));
    }
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-row {
    flex-direction: row;
}

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-start {
    justify-content: flex-start;
}

.justify-end {
    justify-content: flex-end;
}

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

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

.m-0 { margin: 0; }
.m-xs { margin: var(--fcp-spacing-xs); }
.m-sm { margin: var(--fcp-spacing-sm); }
.m-md { margin: var(--fcp-spacing-md); }
.m-lg { margin: var(--fcp-spacing-lg); }
.m-xl { margin: var(--fcp-spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--fcp-spacing-xs); }
.mt-sm { margin-top: var(--fcp-spacing-sm); }
.mt-md { margin-top: var(--fcp-spacing-md); }
.mt-lg { margin-top: var(--fcp-spacing-lg); }
.mt-xl { margin-top: var(--fcp-spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--fcp-spacing-xs); }
.mb-sm { margin-bottom: var(--fcp-spacing-sm); }
.mb-md { margin-bottom: var(--fcp-spacing-md); }
.mb-lg { margin-bottom: var(--fcp-spacing-lg); }
.mb-xl { margin-bottom: var(--fcp-spacing-xl); }

.p-0 { padding: 0; }
.p-xs { padding: var(--fcp-spacing-xs); }
.p-sm { padding: var(--fcp-spacing-sm); }
.p-md { padding: var(--fcp-spacing-md); }
.p-lg { padding: var(--fcp-spacing-lg); }
.p-xl { padding: var(--fcp-spacing-xl); }

/* ============================================================================
   Button Styles
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--fcp-spacing-sm);
    padding: var(--fcp-spacing-sm) var(--fcp-spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--fcp-radius-md);
    cursor: pointer;
    transition: all var(--fcp-transition-fast);
    text-decoration: none;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--fcp-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--fcp-shadow-md);
}

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

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

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

.btn-outline:hover:not(:disabled) {
    background-color: var(--fcp-primary);
    color: white;
}

.btn-sm {
    padding: var(--fcp-spacing-xs) var(--fcp-spacing-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--fcp-spacing-md) var(--fcp-spacing-xl);
    font-size: 1.125rem;
}

/* ============================================================================
   Card Styles
   ============================================================================ */

.card {
    background-color: var(--fcp-bg-primary);
    border-radius: var(--fcp-radius-lg);
    box-shadow: var(--fcp-shadow-sm);
    padding: var(--fcp-spacing-lg);
    transition: box-shadow var(--fcp-transition-base);
}

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

.card-header {
    margin-bottom: var(--fcp-spacing-md);
    padding-bottom: var(--fcp-spacing-md);
    border-bottom: 1px solid var(--fcp-gray-200);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.card-body {
    margin-bottom: var(--fcp-spacing-md);
}

.card-footer {
    margin-top: var(--fcp-spacing-md);
    padding-top: var(--fcp-spacing-md);
    border-top: 1px solid var(--fcp-gray-200);
}

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

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--fcp-gray-200);
    border-top-color: var(--fcp-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

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

@media (max-width: 640px) {
    .container {
        padding: 0 var(--fcp-spacing-sm);
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

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

[dir="rtl"] {
    
    text-align: end;
}

[dir="ltr"] {
    direction: ltr;
    text-align: start;
}