/* General Body Styles */
body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Main Header Styles */
.main-header {
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #333;
    font-weight: bold;
    font-size: 1.5em;
}

.logo {
    height: 40px;
    margin-right: 10px;
}

.site-name {
    white-space: nowrap;
}

.main-navigation .nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.main-navigation .nav-item {
    position: relative;
    margin-left: 30px;
}

.main-navigation .nav-link {
    display: block;
    padding: 10px 0;
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
}

.main-navigation .nav-link:hover,
.main-navigation .nav-link.active {
    color: #007bff;
}

.dropdown-menu {
    display: none;
    position: absolute;
    background-color: #ffffff;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    min-width: 200px;
    z-index: 1000;
    border-top: 2px solid #007bff;
    padding: 10px 0;
    border-radius: 4px;
}

.nav-item.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-item {
    color: #333;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease;
}

.dropdown-item:hover {
    background-color: #f1f1f1;
    color: #007bff;
}

.primary-button {
    background-color: #007bff;
    color: #ffffff;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.primary-button:hover {
    background-color: #0056b3;
}

.mobile-menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    color: #555;
}

.mobile-menu-toggle .icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #555;
    margin: 5px 0;
    transition: all 0.3s ease;
}

.announcement-bar {
    background-color: #e9f7ef;
    color: #28a745;
    text-align: center;
    padding: 10px 0;
    font-size: 0.9em;
    border-bottom: 1px solid #d4edda;
}

.announcement-link {
    color: #28a745;
    font-weight: bold;
    text-decoration: underline;
}

.header-extra-info {
    max-width: 1200px;
    margin: 15px auto 0;
    padding: 0 20px;
    font-size: 0.9em;
    color: #666;
    text-align: justify;
}

/* Main Footer Styles */
.main-footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 40px 0 20px;
    margin-top: 50px;
    font-size: 0.9em;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 0 20px;
}

.footer-section {
    flex: 1;
    min-width: 220px;
    margin-bottom: 30px;
    padding-right: 20px;
}

.footer-section:last-child {
    padding-right: 0;
}

.footer-section h3 {
    color: #ffffff;
    font-size: 1.1em;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 10px;
}

.footer-section p,
.footer-section ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #3498db;
}

.footer-section address {
    font-style: normal;
    margin-top: 10px;
}

.social-media {
    margin-top: 20px;
}

.social-media a {
    display: inline-block;
    margin-right: 15px;
}

.social-media img {
    width: 24px;
    height: 24px;
    filter: invert(1); /* Makes icons white */
    transition: filter 0.3s ease;
}

.social-media a:hover img {
    filter: invert(0.5) sepia(1) saturate(5) hue-rotate(180deg); /* Example hover effect */
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 30px;
    padding-top: 20px;
    text-align: center;
    color: #7f8c8d;
}

.footer-bottom p {
    margin: 0;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .main-navigation .nav-item {
        margin-left: 20px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        justify-content: center;
    }

    .logo-link {
        flex-basis: 100%;
        justify-content: center;
        margin-bottom: 15px;
    }

    .main-navigation {
        order: 3;
        flex-basis: 100%;
        display: none; /* Hide by default on mobile */
        margin-top: 15px;
        text-align: center;
    }

    .main-navigation.active {
        display: block;
    }

    .main-navigation .nav-list {
        flex-direction: column;
        align-items: center;
    }

    .main-navigation .nav-item {
        margin: 0 0 10px 0;
        width: 100%;
    }

    .main-navigation .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid #eee;
    }

    .main-navigation .nav-item:last-child .nav-link {
        border-bottom: none;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        border-top: none;
        padding-left: 0;
        background-color: #f9f9f9;
        border-radius: 0;
        width: 100%;
    }

    .dropdown-item {
        padding-left: 40px;
    }

    .mobile-menu-toggle {
        display: block;
        position: absolute;
        right: 20px;
        top: 25px;
    }

    .header-extra-info {
        text-align: left;
    }

    .footer-container {
        flex-direction: column;
        align-items: center;
    }

    .footer-section {
        width: 100%;
        text-align: center;
        padding-right: 0;
        margin-bottom: 20px;
    }

    .footer-section h3 {
        margin-bottom: 10px;
    }

    .footer-section ul li {
        margin-bottom: 5px;
    }

    .social-media {
        margin-top: 15px;
    }
}

@media (max-width: 480px) {
    .logo-link .site-name {
        display: none;
    }

    .logo {
        height: 35px;
    }

    .announcement-bar p {
        font-size: 0.8em;
        padding: 0 10px;
    }

    .footer-section {
        min-width: unset;
    }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}