:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-primary: #0056b3;
    --accent-secondary: #004494;
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(255, 255, 255, 0.2);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --nav-bg: rgba(0, 68, 148, 0.95);
    --code-bg: #f8f9fa;
    --code-border: #e9ecef;
}

[data-theme="dark"] {
    /* Dark theme colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-gradient: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --accent-primary: #4a90e2;
    --accent-secondary: #357abd;
    --card-bg: rgba(45, 45, 45, 0.95);
    --card-border: rgba(255, 255, 255, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --nav-bg: rgba(45, 45, 45, 0.95);
    --code-bg: #2d2d2d;
    --code-border: #404040;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    direction: rtl;
    text-align: right;
    background: var(--bg-gradient);
    min-height: 100vh;
    transition: all 0.3s ease;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    background: var(--card-bg);
    border: 2px solid var(--accent-primary);
    border-radius: 50px;
    padding: 10px 15px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px var(--shadow-light);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px var(--shadow-medium);
}

[data-theme="light"] .moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: #fff;
    padding: 3rem 0;
    text-align: center;
    box-shadow: 0 4px 6px var(--shadow-light);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: fadeInDown 1s ease-out;
}

header p {
    font-size: 1.3rem;
    opacity: 0.95;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-image {
    max-width: 600px;
    width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1s ease-out 0.6s both;
}

/* Navigation */
nav {
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px var(--shadow-light);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    padding: 0.7rem 1.2rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    display: block;
    white-space: nowrap;
}

nav ul li a:hover,
nav ul li a.active {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: var(--card-bg);
    margin-bottom: 2rem;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px var(--shadow-light);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease-out;
}

section:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

h2 {
    color: var(--accent-primary);
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

h3 {
    color: var(--accent-secondary);
    font-size: 1.6rem;
    margin: 2rem 0 1rem 0;
}

h4 {
    color: var(--accent-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

ul {
    margin-right: 2rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.8rem;
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-primary);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 6px 20px var(--shadow-light);
    transition: all 0.3s ease;
    border-right: 5px solid var(--accent-primary);
    border: 1px solid var(--card-border);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px var(--shadow-medium);
}

.feature-card h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feature-card ul {
    margin-right: 1rem;
}

.feature-card li {
    font-size: 1rem;
    margin-bottom: 0.6rem;
}

/* Screenshots Grid */
.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.screenshot-item {
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    box-shadow: 0 6px 20px var(--shadow-light);
    transition: all 0.3s ease;
    background: var(--card-bg);
}

.screenshot-item:hover {
    transform: scale(1.03);
    box-shadow: 0 12px 30px var(--shadow-medium);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 15px 15px 0 0;
}

.screenshot-item p {
    padding: 1rem;
    margin: 0;
    text-align: center;
    font-weight: 600;
    color: var(--accent-primary);
    background: var(--card-bg);
}

/* Download Section */
.download-section {
    text-align: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 15px;
    margin: 2rem 0;
}

.download-button {
    display: inline-block;
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: #fff;
    padding: 1.2rem 2.5rem;
    text-decoration: none;
    border-radius: 50px;
    margin: 1rem 0.5rem;
    font-weight: 600;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.3);
}

.download-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(40, 167, 69, 0.4);
    background: linear-gradient(135deg, #218838 0%, #1e7e34 100%);
}

/* Code Blocks */
pre {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 1rem 0;
    overflow-x: auto;
    font-size: 0.95rem;
    direction: ltr;
    text-align: left;
}

code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background: var(--code-bg);
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-size: 0.9rem;
    border: 1px solid var(--code-border);
}

/* Steps */
.steps {
    display: grid;
    gap: 1.5rem;
    margin: 2rem 0;
}

.step {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 10px;
    border-right: 4px solid var(--accent-primary);
}

/* Technical Info */
.technical-info ul {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 10px;
    margin: 1rem 0;
}

/* Acknowledgements Grid */
.acknowledgements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.person-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--shadow-light);
    transition: all 0.3s ease;
    border-right: 4px solid var(--accent-primary);
}

.person-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.person-card h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.person-card p {
    font-size: 1rem;
    margin: 0;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #333 0%, #222 100%);
    color: #fff;
    text-align: center;
    padding: 3rem 1rem;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    margin: 0 1rem;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .theme-toggle {
        top: 10px;
        left: 10px;
        padding: 8px 12px;
        font-size: 1rem;
    }
    
    header h1 {
        font-size: 2.2rem;
    }
    
    header p {
        font-size: 1.1rem;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 0.3rem;
    }
    
    nav ul li a {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .screenshot-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .acknowledgements-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header {
        padding: 2rem 0;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    section {
        padding: 1rem;
    }
    
    .download-button {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
    
    ul {
        margin-right: 1rem;
    }
}