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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.update-date {
    font-size: 0.9em;
    opacity: 0.9;
}

main {
    padding: 40px 30px;
}

.intro {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border-left: 4px solid #667eea;
}

.info-section {
    margin-bottom: 35px;
}

.info-section h2 {
    color: #667eea;
    font-size: 1.8em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e9ecef;
}

.info-card {
    background: #f8f9fa;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 8px;
    border-left: 4px solid #764ba2;
    transition: transform 0.2s, box-shadow 0.2s;
}

.info-card:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.info-card h3 {
    color: #495057;
    margin-bottom: 12px;
    font-size: 1.2em;
}

.info-card ul {
    list-style: none;
}

.info-card ul li {
    padding: 8px 0;
    color: #555;
}

.info-card ul li strong {
    color: #764ba2;
}

.info-card p {
    color: #555;
    padding: 6px 0;
}

.info-card.highlight {
    background: #f3f0ff;
    border-left-color: #667eea;
}

.section-note {
    background: #fff8e6;
    border-left: 4px solid #f0a500;
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 18px;
    color: #555;
}

.section-note strong {
    color: #b06f00;
}

.usage-list {
    list-style: none;
    padding-left: 0;
}

.usage-list li {
    padding: 10px 0 10px 30px;
    position: relative;
    color: #555;
}

.usage-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
    font-size: 1.2em;
}

.usage-list li strong {
    color: #764ba2;
}

.contact {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    margin-top: 30px;
}

.contact h2 {
    color: #667eea;
    margin-bottom: 15px;
}

.contact ul {
    list-style: none;
    padding-left: 0;
}

.contact ul li {
    padding: 8px 0;
    color: #555;
}

footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header {
        padding: 30px 20px;
    }

    header h1 {
        font-size: 2em;
    }

    main {
        padding: 25px 20px;
    }

    .info-section h2 {
        font-size: 1.5em;
    }
}