* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", "PingFang SC", sans-serif;
}

body {
    background-color: #f5f7fb;
    color: #333;
    line-height: 1.8;
}

header {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: white;
    padding: 60px 20px 80px;
    text-align: center;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

nav {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 999;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav a {
    color: #555;
    text-decoration: none;
    padding: 14px 18px;
    font-size: 0.95rem;
    transition: color 0.3s;
}

nav a:hover {
    color: #2a5298;
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.section {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.05);
}

.section-title {
    font-size: 1.8rem;
    color: #1e3c72;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #2a5298;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.info-card {
    background: #f8fafd;
    border-radius: 10px;
    padding: 20px;
    transition: transform 0.3s;
}

.info-card:hover {
    transform: translateY(-5px);
}

.info-card h3 {
    color: #2a5298;
    margin-bottom: 12px;
}

ul {
    padding-left: 20px;
}

li {
    margin-bottom: 8px;
}

button {
    margin-top:16px;
    padding:10px 20px;
    background:#2a5298;
    color:#fff;
    border:none;
    border-radius:6px;
    cursor:pointer;
}
button:hover{
    background:#1e3c72;
}

.tip-box{
    margin-top:12px;
    padding:12px;
    background:#e8f0fe;
    border-radius:6px;
    color:#1e3c72;
}

footer {
    background-color: #1e3c72;
    color: white;
    text-align: center;
    padding: 25px 20px;
    margin-top: 40px;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    nav a {
        padding: 10px 12px;
        font-size: 0.85rem;
    }
    .section {
        padding: 20px;
    }
}