/* Critical CSS - Above the fold only */
:root {
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary-color: #1e293b;
    --accent-color: #000000;
    --success-color: #10b981;
    --whatsapp-color: #25d366;
    --text-color: #0f172a;
    --text-light: #64748b;
    --text-white: #ffffff;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --spacing: 8px;
    --container-padding: 20px;
    --section-padding: 80px;
    --card-padding: 32px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: 'Tajawal', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    direction: rtl;
    background: var(--bg-white);
    color: var(--text-color);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-display: swap;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Header - Critical */
.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    padding: calc(var(--spacing) * 2) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all var(--transition-fast);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: calc(var(--spacing) * 2);
}

.logo h1 {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.75rem;
    font-weight: 800;
    margin: 0;
}

.logo a {
    text-decoration: none;
}

.nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: calc(var(--spacing) * 3);
    align-items: center;
    margin: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color var(--transition-fast);
    padding: calc(var(--spacing) / 2) var(--spacing);
    border-radius: var(--border-radius);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

/* Buttons - Critical */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: calc(var(--spacing) / 2);
    padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 3);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    will-change: transform;
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    transform: translate3d(0, -2px, 0);
    box-shadow: var(--shadow-xl);
}

.btn-whatsapp {
    background: linear-gradient(135deg, var(--whatsapp-color) 0%, #128c7e 100%);
    color: var(--text-white);
}

.btn-whatsapp:hover {
    background: linear-gradient(135deg, #128c7e 0%, var(--whatsapp-color) 100%);
    transform: translate3d(0, -2px, 0);
    box-shadow: var(--shadow-xl);
}

.btn-lg {
    padding: calc(var(--spacing) * 2) calc(var(--spacing) * 4);
    font-size: 1.2rem;
}

/* Hero Section - Critical */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--text-white);
    padding: var(--section-padding) 0;
    min-height: 85vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1" fill="white" opacity="0.1"/><circle cx="80" cy="80" r="1" fill="white" opacity="0.1"/><circle cx="40" cy="60" r="1" fill="white" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: calc(var(--spacing) * 6);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    padding-right: calc(var(--spacing) * 2);
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: calc(var(--spacing) * 3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: calc(var(--spacing) * 4);
    opacity: 0.95;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing) * 2);
    margin-bottom: calc(var(--spacing) * 4);
}

.hero-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing) * 3);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing) / 2);
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
}

.feature-item .icon {
    font-size: 1.5rem;
}

.hero-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
}

/* Mobile Responsive - Critical */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header-content {
        flex-direction: column;
        gap: calc(var(--spacing) * 2);
        text-align: center;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        gap: calc(var(--spacing) * 2);
        justify-content: center;
    }
    
    .hero {
        min-height: 70vh;
        padding: calc(var(--spacing) * 8) 0;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing) * 6);
        text-align: center;
    }
    
    .hero-text {
        padding-right: 0;
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-image img {
        height: 300px;
    }
    
    .hero-buttons {
        justify-content: center;
        gap: calc(var(--spacing) * 2);
    }
    
    .hero-features {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing) * 2);
    }
    
    .btn {
        padding: calc(var(--spacing) * 2) calc(var(--spacing) * 3);
        font-size: 0.95rem;
    }
    
    .btn-lg {
        padding: calc(var(--spacing) * 2.5) calc(var(--spacing) * 4);
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.875rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-image img {
        height: 250px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: calc(var(--spacing) * 3);
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Performance optimizations */
img {
    max-width: 100%;
    height: auto;
}

img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Preload critical fonts */
@font-face {
    font-family: 'Tajawal';
    font-display: swap;
}