:root {
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --accent-color: #60a5fa;
    --text-color: #1e293b;
    --background-color: #f8fafc;
    --card-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--background-color) 0%, #e2e8f0 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header Styles */
.extension-header {
    background: var(--card-bg);
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo img {
    width: 32px;
    height: 32px;
}

.logo span {
    font-weight: 600;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin-left: auto;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    padding: 1rem 0;
    position: relative;
    transition: color var(--transition-speed);
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-speed);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: #64748b;
}

/* Download Cards */
.download-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    padding: 2rem 0;
}

.download-card {
    background: var(--card-bg);
    border-radius: 1rem;
    box-shadow: 0 4px 6px var(--shadow-color);
    overflow: hidden;
    transition: transform var(--transition-speed);
}

.download-card:hover {
    transform: translateY(-5px);
}

.card-header {
    display: flex;
    align-items: center;
    padding: 1.5rem;
    background: var(--primary-color);
    color: white;
}

.card-header img {
    width: 50px;
    height: 50px;
    margin-right: 1rem;
}

.card-title h2 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.version {
    font-size: 0.9rem;
    opacity: 0.9;
}

.card-body {
    padding: 1.5rem;
}

.feature-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
}

.install-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: 0.5rem;
    text-decoration: none;
    transition: background-color var(--transition-speed);
}

.install-btn:hover {
    background: var(--secondary-color);
}

/* Feature Grid */
.feature-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    padding: 1rem 0;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* FAQ Section */
.faq-list {
    background: var(--card-bg);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 2px 4px var(--shadow-color);
}

details {
    border-bottom: 1px solid #e2e8f0;
    padding: 1rem;
}

details[open] {
    background: #f8fafc;
}

summary {
    cursor: pointer;
    font-weight: 500;
    padding: 0.5rem;
}

details p {
    padding: 1rem;
    color: #64748b;
}

/* Footer */
.extension-footer {
    background: var(--card-bg);
    margin-top: 4rem;
    padding: 2rem 0;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .download-grid {
        grid-template-columns: 1fr;
    }
}