/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Arial", sans-serif;
}

/* 导航栏样式 */
nav {
    background-color: #000;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 999;
}

.logo {
    color: #fff;
    font-size: 1.8rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

    .logo span {
        color: #007bff;
    }

.nav-links {
    display: flex;
    gap: 2.5rem;
}

    .nav-links a {
        color: #fff;
        text-decoration: none;
        font-size: 1.1rem;
        transition: color 0.3s ease;
    }

        .nav-links a:hover {
            color: #007bff;
        }

/* 页脚样式 */
footer {
    background-color: #000;
    color: #fff;
    padding: 3rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-info {
    font-size: 0.95rem;
    line-height: 1.8;
}

.footer-logo {
    color: #fff;
    font-size: 1.8rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

    .footer-logo span {
        color: #007bff;
    }

/* 媒体查询：平板/手机适配 */
@media (max-width: 768px) {
    .nav-links {
        gap: 1.5rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .content {
        padding: 2rem 5%;
        gap: 2rem;
    }

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

    .close-btn {
        top: -35px;
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 3%;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .content-card {
        min-width: 100%;
    }

    .close-btn {
        top: -30px;
        font-size: 1.5rem;
    }
}