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

body {
    background-color: #ffffff;
}

header .logo-container {
    text-align: center;
    background-color: #0874d6;
}

header .logo-container img {
    height: 100%;
}

header .nav-container {
    text-align: center;
    margin-top: 5px;
    margin-bottom: 5px;
}

header .nav-button {
    position: relative;
    display: inline-block;
    padding: 12px 24px;
    font-size: 16px;
    letter-spacing: 1px;
    text-decoration: none;
    color: #0874d6;
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease-out;
    border: 2px solid #0874d6;
    border-radius: 10px;
    box-shadow: inset 0 0 0 0 #0874d6;
}

header .nav-button:hover {
    color: white;
    box-shadow: inset 0 -100px 0 0 #0874d6;
}

header .nav-button:active {
    transform: scale(0.95);
}

.company-pic {
    text-align: center;
}

.company-pic img {
    height: 450px;
}

.page-container {
    display: flex;
    flex-direction: row;
    max-width: 1200px;
    margin: 0 auto;
}

aside {
    width: 220px;
    flex-shrink: 0;
    background-color: #f8f8f8;
    padding: 20px;
    border-right: 1px solid #ccc;
}

aside .section-title {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 10px;
    color: white;
    background-color: #0874d6;
    padding: 10px;
    text-align: center;
    border-radius: 4px;
}

aside .nav-list {
    list-style: none;
    padding: 0;
    margin-bottom: 20px;
}

aside .nav-list li {
    margin: 6px 0;
}

aside .nav-list a {
    color: #0874d6;
    text-decoration: none;
    padding-left: 10px;
    display: block;
}

aside .nav-list a:hover {
    background-color: #0874d633;
}

aside .contact-box {
    border-radius: 4px;
    font-size: 14px;
    color: #333;
}

aside .contact-box .hotline {
    font-size: 16px;
    color: #d32f2f;
    font-weight: bold;
}

main #detail h2 {
    text-align: center;
    font-size: 28px;
    color: #0874d6;
    margin-bottom: 30px;
}

main #detail p {
    margin-bottom: 16px;
    text-indent: 2em;
}

main #detail ul {
    padding-left: 2em;
    margin-top: 10px;
}

main #detail li {
    margin-bottom: 8px;
}

main #detail {
    flex: 1;
    padding: 30px;
}

footer {
    background-color: #0874d6;
    color: white;
    padding: 40px 20px 20px;
    font-size: 14px;
    line-height: 1.8;
    margin-top: 10px;
}

footer .top {
    display: flex;
    justify-content: center;
    gap: 80px;
    /* 两栏之间间距 */
    flex-wrap: wrap;
    max-width: 1200px;
    margin: auto;
    text-align: left;
}

footer .column {
    flex: 1;
    min-width: 250px;
}

footer .column h4 {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 10px;
    border-bottom: 1px solid #ffffff33;
    padding-bottom: 6px;
}

footer .bottom {
    margin-top: 30px;
    text-align: center;
    color: #ccc;
    font-size: 13px;
    border-top: 1px solid #ffffff33;
    padding-top: 15px;
}

footer .contact-box h4 {
    margin-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 5px;
}

footer .contact-item {
    display: flex;
    margin-bottom: 6px;
}

footer .contact-item label {
    width: 50px;
    font-weight: bold;
    flex-shrink: 0;
}

footer .contact-item span {
    flex: 1;
}