:root {
    --primary-blue: #3182ce;
    --primary-green: #48bb78;
    --dark-gray: #1a202c;
    --light-gray: #f7fafc;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.5;
    background: white;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: white;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-gray);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-blue);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 5rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    display: block;
    font-size: 2rem;
    font-weight: 600;
    margin-top: 0.5rem;
    background: linear-gradient(to right, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 1.125rem;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.btn-icon {
    width: 1.5rem;
    height: 1.5rem;
}

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

.btn-android:hover {
    background: #38a169;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-windows:hover {
    background: #2c5282;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-download {
    width: 100%;
    justify-content: center;
}

.version-info {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: var(--light-gray);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

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

.feature-icon {
    width: 3rem;
    height: 3rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.android-icon {
    background: rgba(72, 187, 120, 0.1);
    color: var(--primary-green);
}

.windows-icon {
    background: rgba(49, 130, 206, 0.1);
    color: var(--primary-blue);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.feature-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
}

/* Page Headers */
.page-header {
    padding: 3rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.android-header {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
}

.windows-header {
    background: linear-gradient(135deg, #3182ce 0%, #2c5282 100%);
}

.page-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.platform-icon {
    width: 2.5rem;
    height: 2.5rem;
}

.page-description {
    font-size: 1.125rem;
    opacity: 0.95;
}

/* Releases Section */
.releases {
    padding: 3rem 0;
    min-height: 60vh;
}

.latest-release h2,
.previous-releases h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--dark-gray);
}

.release-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.2s;
}

.release-card.featured {
    border: 2px solid var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.release-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.release-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.release-title h3 {
    font-size: 1.5rem;
    color: var(--dark-gray);
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-latest {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.badge-stable {
    background: var(--primary-green);
    color: white;
}

.badge-beta {
    background: #f6ad55;
    color: white;
}

.release-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.release-description {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.release-meta {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.meta-item {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.releases-list {
    display: grid;
    gap: 1rem;
}

.previous-releases {
    margin-top: 3rem;
}

/* Footer */
.footer {
    background: var(--dark-gray);
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .release-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .release-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}