:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --text-primary: #000000;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: #e1e1e1;
    --accent-color: #000000;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-tertiary: #999999;
    --border-color: #333333;
    --accent-color: #ffffff;
    --shadow: 0 2px 8px rgba(255, 255, 255, 0.1);
    --shadow-hover: 0 4px 16px rgba(255, 255, 255, 0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

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

.nav-links a:hover {
    color: var(--text-primary);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
}

.toggle-icon {
    font-size: 1.2rem;
}

/* Hero Section */
.hero {
    padding: 8rem 0 6rem;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 400;
}

.hero-pitch {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-1px);
}

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

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

/* Sections */
section {
    padding: 5rem 0;
}

h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    text-align: center;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* About Section */
.about {
    background-color: var(--bg-secondary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

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

.feature-item {
    text-align: center;
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    transition: all 0.2s ease;
}

.feature-item:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-item h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Screenshots Section */
.screenshots {
    background-color: var(--bg-secondary);
}

.screenshot-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.theme-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

.theme-btn.active,
.theme-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.screenshot-item {
    position: relative;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.screenshot {
    width: 100%;
    height: auto;
    display: none;
    transition: opacity 0.3s ease;
}

.screenshot.active {
    display: block;
}

/* Download Section */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.download-card {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    background-color: var(--bg-primary);
    text-align: center;
    transition: all 0.2s ease;
}

.download-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.download-details {
    margin-bottom: 2rem;
    text-align: left;
}

.download-details p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.download-links {
    text-align: center;
}

.link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.link:hover {
    border-bottom-color: var(--accent-color);
}

/* Support Section */
.support {
    background-color: var(--bg-secondary);
}

.support-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
}

.support-links h3 {
    margin-bottom: 1rem;
    margin-top: 2rem;
}

.support-links h3:first-child {
    margin-top: 0;
}

.support-links ul {
    list-style: none;
}

.support-links li {
    margin-bottom: 0.5rem;
}

.support-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-primary);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.support-table th,
.support-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.support-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.support-table td {
    color: var(--text-secondary);
}

.status-yes {
    color: var(--text-primary);
    font-weight: 600;
}

.status-wip {
    color: var(--text-tertiary);
    font-style: italic;
}

.status-partial {
    color: var(--text-secondary);
}

.status-no {
    color: var(--text-tertiary);
}

/* Footer */
.footer {
    background-color: var(--bg-tertiary);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .support-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .screenshot-gallery {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .feature-item {
        padding: 1.5rem;
    }
    
    .download-card {
        padding: 1.5rem;
    }
}