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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

nav a:hover,
nav a.active {
    background-color: rgba(255, 255, 255, 0.2);
}

main {
    min-height: calc(100vh - 200px);
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 4rem 0;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 3rem 0;
}

.page-header h2 {
    font-size: 2rem;
}

.content {
    padding: 3rem 0;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.card h3 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.card p {
    color: #666;
    line-height: 1.8;
}

.features {
    background: white;
    padding: 3rem 0;
}

.features h2 {
    text-align: center;
    color: #333;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
}

.feature-item h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.feature-item p {
    color: #666;
}

.about-content,
.contact-content {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.about-content h3,
.contact-content h3 {
    color: #667eea;
    margin: 2rem 0 1rem 0;
    font-size: 1.5rem;
}

.about-content h3:first-child,
.contact-content h3:first-child {
    margin-top: 0;
}

.about-content p,
.contact-content p {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-content ul {
    list-style: none;
    padding-left: 1rem;
}

.about-content ul li {
    color: #666;
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.about-content ul li:before {
    content: "✓";
    color: #667eea;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.contact-info {
    margin-bottom: 2rem;
}

.info-item {
    padding: 0.8rem 0;
    border-bottom: 1px solid #eee;
}

.info-item strong {
    color: #333;
    margin-right: 1rem;
}

.info-item span {
    color: #666;
}

.notice {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.notice h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

.notice p {
    margin-bottom: 0.5rem;
    color: #666;
}

footer {
    background: #2c3e50;
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-info p {
    margin: 0.3rem 0;
    color: #bdc3c7;
}

.icp-info a {
    color: #3498db;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.icp-info a:hover {
    color: #5dade2;
    text-decoration: underline;
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

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