:root {
    --primary: #1976D2;
    --primary-dark: #1565C0;
    --accent: #00BCD4;
    --text: #212121;
    --text-secondary: #757575;
    --background: #FAFAFA;
    --card: #FFFFFF;
    --border: #E0E0E0;
    --success: #4CAF50;
    --warning: #FF9800;
    --error: #F44336;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--background);
}
header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 40px 20px;
    text-align: center;
}
header h1 { font-size: 2.5rem; margin-bottom: 10px; }
header p { opacity: 0.9; font-size: 1.1rem; }
nav {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 15px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}
nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}
nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s;
}
nav a:hover, nav a.active { border-color: var(--primary); }
main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}
.hero {
    text-align: center;
    padding: 40px 0;
}
.hero h2 { font-size: 1.8rem; margin-bottom: 15px; color: var(--text); }
.hero p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.platforms {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 25px;
    flex-wrap: wrap;
}
.platform {
    background: var(--card);
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    color: var(--primary);
}
.version-badge {
    display: inline-block;
    margin-top: 20px;
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--success) 0%, #2E7D32 100%);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}
.card {
    background: var(--card);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}
.card-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 15px;
}
.card h3 { margin-bottom: 10px; color: var(--text); }
.card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 15px; }
.card a, main a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}
.card a:hover, main a:hover { text-decoration: underline; }
.quick-start, .content-section {
    background: var(--card);
    border-radius: 12px;
    padding: 30px;
    margin-top: 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.quick-start h2, .content-section h2 { margin-bottom: 20px; color: var(--text); }
.content-section h3 { margin: 25px 0 15px; color: var(--text); }
.content-section p { margin-bottom: 15px; }
.content-section ul, .content-section ol {
    margin: 15px 0 15px 25px;
}
.content-section li { margin-bottom: 8px; }
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}
.step {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}
.step-number {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}
.step-content h4 { margin-bottom: 5px; }
.step-content p { color: var(--text-secondary); font-size: 0.9rem; }
.tip, .warning, .note {
    padding: 15px 20px;
    border-radius: 8px;
    margin: 20px 0;
}
.tip {
    background: #E8F5E9;
    border-left: 4px solid var(--success);
}
.warning {
    background: #FFF3E0;
    border-left: 4px solid var(--warning);
}
.note {
    background: #E3F2FD;
    border-left: 4px solid var(--primary);
}
.tip strong, .warning strong, .note strong { display: block; margin-bottom: 5px; }
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
th {
    background: var(--background);
    font-weight: 600;
}
code {
    background: #ECEFF1;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 0.9em;
}
.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-item h3 { color: var(--primary); margin-bottom: 10px; }
footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 50px;
}
footer a { color: var(--primary); text-decoration: none; }
.screenshot {
    display: block;
    max-width: 320px;
    width: 100%;
    height: auto;
    margin: 24px auto;
    border-radius: 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border);
}
figure.screenshot-figure {
    margin: 32px auto;
    text-align: center;
    max-width: 360px;
}
figure.screenshot-figure img {
    display: block;
    max-width: 320px;
    width: 100%;
    height: auto;
    margin: 0 auto;
    border-radius: 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border);
}
figure.screenshot-figure figcaption {
    margin-top: 12px;
    font-size: 0.9em;
    color: var(--text-secondary);
    font-style: italic;
}
@media (max-width: 600px) {
    header h1 { font-size: 1.8rem; }
    nav ul { gap: 15px; }
    .content-section { padding: 20px; }
    .screenshot, figure.screenshot-figure img { max-width: 280px; }
}