* {
    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;
    color: #333;
    background: #f5f7fa;
    line-height: 1.6;
}

/* Header */
.header {
    background: linear-gradient(135deg, #4a90d9 0%, #357abd 100%);
    color: #fff;
    padding: 60px 20px 80px;
    text-align: center;
    position: relative;
}

.header h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 4px;
}

.header .subtitle {
    font-size: 18px;
    opacity: 0.9;
    letter-spacing: 2px;
}

.header .tagline {
    margin-top: 24px;
    font-size: 15px;
    opacity: 0.8;
}

/* Section */
.section {
    max-width: 960px;
    margin: 0 auto;
    padding: 60px 20px;
}

.section-title {
    text-align: center;
    font-size: 28px;
    color: #357abd;
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 40px;
    height: 3px;
    background: #4a90d9;
    margin: 12px auto 0;
    border-radius: 2px;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #fff;
    border-radius: 12px;
    padding: 36px 28px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    color: #357abd;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: #666;
    line-height: 1.8;
}

/* About */
.about-content {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    text-align: center;
}

.about-content p {
    font-size: 15px;
    color: #555;
    margin-bottom: 16px;
    line-height: 2;
}

/* Footer */
.footer {
    background: #3a3a3a;
    color: #aaa;
    text-align: center;
    padding: 30px 20px;
    font-size: 13px;
    line-height: 2;
}

.footer a {
    color: #ccc;
    text-decoration: none;
}

.footer .icp {
    margin-top: 8px;
    font-size: 12px;
}

/* Responsive */
@media (max-width: 640px) {
    .header h1 {
        font-size: 36px;
    }

    .header .subtitle {
        font-size: 15px;
    }

    .section {
        padding: 40px 16px;
    }

    .section-title {
        font-size: 22px;
    }
}