:root {
    --primary-color: #1a73e8;
    --primary-hover: #174ea6;
    --text-color: #202124;
    --text-light: #5f6368;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #dadce0;
    --font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

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

/* Header */
.header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-light);
}

.nav a {
    margin-left: 20px;
    color: var(--text-light);
    font-weight: 500;
    text-decoration: none;
}

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

/* Hero Section */
.hero {
    background-color: var(--bg-light);
    padding: 80px 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 400;
    margin-bottom: 20px;
    color: var(--text-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 4px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s, box-shadow 0.2s;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: white;
    text-decoration: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.download-actions {
    margin-bottom: 20px;
}

.version-info {
    display: block;
    margin-top: 10px;
    font-size: 0.875rem;
    color: var(--text-light);
}

.os-links {
    font-size: 0.9rem;
}

/* Features Section */
.features {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 50px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 20px;
}

.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-light);
}

/* SEO Content / Article */
.seo-content, .content-section {
    padding: 60px 0;
}

article {
    max-width: 800px;
    margin: 0 auto;
}

article h2 {
    font-size: 1.8rem;
    margin-top: 40px;
    margin-bottom: 20px;
    font-weight: 500;
}

article h3 {
    font-size: 1.4rem;
    margin-top: 30px;
    margin-bottom: 15px;
    font-weight: 500;
}

article p {
    margin-bottom: 20px;
    color: var(--text-light);
    font-size: 1.05rem;
}

.cta-box {
    background-color: var(--bg-light);
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    margin-top: 50px;
}

.cta-box h3 {
    margin-top: 0;
}

/* Inner Page Header */
.inner-page .page-header {
    background-color: var(--bg-light);
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.inner-page .page-header h1 {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: 15px;
}

.inner-page .page-header p {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* FAQ List */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.faq-item h3 {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 10px;
    color: var(--text-color);
}

.faq-item p {
    color: var(--text-light);
}

/* Footer */
.footer {
    background-color: var(--bg-light);
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--text-light);
    margin: 0 10px;
}

.copyright {
    color: #9aa0a6;
    font-size: 0.875rem;
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        height: auto;
        padding: 15px 0;
    }
    .nav {
        margin-top: 15px;
    }
    .nav a {
        margin: 0 10px;
    }
    .hero-title {
        font-size: 2rem;
    }
    .inner-page .page-header h1 {
        font-size: 2rem;
    }
}