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

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: #165DFF;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 99;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    margin: 0 1rem;
    transition: 0.3s;
}

.nav-links a:hover {
    color: #E6FFFB;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    background: #0FC6C2;
    color: #fff;
    cursor: pointer;
}

.banner {
    height: 60vh;
    background: linear-gradient(to right, #165DFF, #4080FF);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 5%;
}

.banner h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.sections {
    padding: 4rem 5%;
    text-align: center;
    background: #ECF5FF;
}

.sections h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #1D2129;
}

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

.card {
    padding: 2rem;
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: 0.3s;
}

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

.card h3 {
    margin-bottom: 1rem;
    color: #165DFF;
}

.card p {
    color: #4E5969;
    line-height: 1.6;
}

footer {
    padding: 2rem 5%;
    background: #165DFF;
    color: #ffffff;
    text-align: center;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .banner h1 {
        font-size: 2rem;
    }
}