:root {
    /* Colors - Light Mode */
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-text-main: #1a1a1a;
    --color-text-muted: #666666;
    --color-primary: #0f172a; /* Deep Navy */
    --color-accent: #b8860b; /* Dark Goldenrod/Bronze */
    --color-border: #e2e8f0;
    --color-error: #dc2626;
    --color-success: #16a34a;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Typography */
    --font-ar: 'Cairo', sans-serif;
    --font-en-head: 'Playfair Display', serif;
    --font-en-body: 'Inter', sans-serif;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;

    /* 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);
}

[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-primary: #f8fafc;
    --color-accent: #d4af37;
    --color-border: #334155;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    transition: background-color var(--transition-medium), color var(--transition-medium);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

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

a:hover {
    color: var(--color-accent);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Language Specific Fonts & Directions */
html[lang="en"] body {
    font-family: var(--font-en-body);
}

html[lang="en"] h1, html[lang="en"] h2, html[lang="en"] h3 {
    font-family: var(--font-en-head);
    font-weight: 700;
}

html[lang="ar"] body {
    font-family: var(--font-ar);
}

/* RTL Support - mostly handled by dir="rtl" but adding helpers */
[dir="rtl"] {
    text-align: right;
}

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

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section {
    padding: var(--spacing-lg) 0;
}

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

.flex {
    display: flex;
    gap: var(--spacing-sm);
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

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

[data-theme="dark"] .btn-primary {
    color: var(--color-bg);
}

.btn-primary:hover {
    background-color: var(--color-accent);
    color: #fff;
}

.btn-outline {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

/* Components */

/* Nav */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

[data-theme="dark"] .navbar {
    background-color: rgba(15, 23, 42, 0.9);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
    font-family: var(--font-en-head);
    letter-spacing: -0.5px;
}
html[lang="ar"] .nav-logo {
    font-family: var(--font-ar);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-toggle {
    display: none;
}

/* Hero */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 80px; /* offset nav */
    background: linear-gradient(to bottom, var(--color-bg), var(--color-surface));
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.hero-text .subtitle {
    font-size: 1.25rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-image {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}
.hero-image img {
    width: 100%;
    object-fit: cover;
    aspect-ratio: 3/4;
}

/* Cards */
.card {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

/* Form */
.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-input, .form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background-color: var(--color-bg);
    color: var(--color-text-main);
    font-family: inherit;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

/* Theme Toggle */
.theme-toggle, .lang-toggle {
    background: none;
    border: 1px solid var(--color-border);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    color: var(--color-text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: block;
        background: none;
        border: none;
        color: var(--color-text-main);
        font-size: 1.5rem;
        cursor: pointer;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
        max-width: 300px;
        margin: 0 auto;
    }

    .hero-text h1 {
        font-size: 2.25rem;
    }
}

/* Animation utilities */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}