/* General Body Styling */
body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f4f4f4;
}

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

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

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.main-header .logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #333;
    font-size: 24px;
    font-weight: bold;
}

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

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

.main-nav .nav-item {
    margin-left: 25px;
    position: relative;
}

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

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

.main-nav .dropdown-menu {
    display: none;
    position: absolute;
    background-color: #ffffff;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    min-width: 180px;
    z-index: 100;
    list-style: none;
    padding: 10px 0;
    margin: 0;
    border-radius: 4px;
}

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

.main-nav .dropdown-menu li a {
    color: #333;
    padding: 10px 20px;
    text-decoration: none;
    display: block;
    white-space: nowrap;
}

.main-nav .dropdown-menu li a:hover {
    background-color: #f8f8f8;
    color: #007bff;
}

.utility-nav {
    display: flex;
    align-items: center;
}

.utility-nav .utility-link {
    margin-left: 15px;
    text-decoration: none;
    color: #007bff;
    font-weight: 500;
}

.utility-nav .utility-link:hover {
    text-decoration: underline;
}

.button {
    padding: 8px 15px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.primary-button {
    background-color: #007bff;
    color: #ffffff;
    border: 1px solid #007bff;
}

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

.secondary-button {
    background-color: #f8f9fa;
    color: #007bff;
    border: 1px solid #007bff;
}

.secondary-button:hover {
    background-color: #e2e6ea;
    color: #0056b3;
}

.search-box {
    margin-left: 20px;
    display: flex;
    border: 1px solid #ccc;
    border-radius: 5px;
    overflow: hidden;
}

.search-box input {
    border: none;
    padding: 8px 10px;
    outline: none;
}

.search-box button {
    background-color: #eee;
    border: none;
    padding: 8px 10px;
    cursor: pointer;
}

.search-box button:hover {
    background-color: #ddd;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 5px 0;
}

/* Announcement Bar */
.announcement-bar {
    background-color: #e9f7fe;
    padding: 10px 0;
    text-align: center;
    font-size: 0.9em;
    color: #0056b3;
    border-bottom: 1px solid #d1ecf1;
}

.announcement-bar a {
    color: #007bff;
    text-decoration: underline;
}

/* Header Description */
.header-description {
    padding: 20px 0;
    text-align: center;
    background-color: #f9f9f9;
    border-top: 1px solid #eee;
    font-size: 0.95em;
    color: #666;
}
.header-description p {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.main-footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.main-footer .footer-heading {
    color: #ffffff;
    font-size: 1.2em;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 10px;
}

.main-footer .about-col p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.main-footer .social-links a {
    color: #ecf0f1;
    font-size: 1.5em;
    margin-right: 15px;
    transition: color 0.3s ease;
}

.main-footer .social-links a:hover {
    color: #007bff;
}

.main-footer .footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.main-footer .footer-list li {
    margin-bottom: 10px;
}

.main-footer .footer-list li a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.main-footer .footer-list li a:hover {
    color: #007bff;
    text-decoration: underline;
}

.main-footer .footer-address p {
    margin-bottom: 5px;
}

.main-footer .footer-address a {
    color: #ecf0f1;
    text-decoration: none;
}

.main-footer .newsletter-form {
    margin-top: 20px;
}

.main-footer .newsletter-heading {
    color: #ffffff;
    font-size: 1em;
    margin-bottom: 10px;
}

.main-footer .newsletter-form input[type="email"] {
    width: calc(100% - 100px);
    padding: 10px;
    border: none;
    border-radius: 4px 0 0 4px;
    outline: none;
}

.main-footer .newsletter-form .subscribe-button {
    background-color: #007bff;
    color: #ffffff;
    border: none;
    padding: 10px 15px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.main-footer .newsletter-form .subscribe-button:hover {
    background-color: #0056b3;
}

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

.main-footer .copyright {
    margin-bottom: 10px;
}

.main-footer .copyright a {
    color: #ecf0f1;
    text-decoration: none;
    margin: 0 5px;
}

.main-footer .copyright a:hover {
    text-decoration: underline;
}

.main-footer .company-motto {
    font-style: italic;
    color: #bdc3c7;
    line-height: 1.7;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        width: 100%;
        order: 3; /* Move nav below logo and utility */
    }

    .main-nav .nav-list {
        flex-direction: column;
        width: 100%;
        display: none; /* Hidden by default for mobile */
    }

    .main-nav .nav-list.active {
        display: flex; /* Show when active */
    }

    .main-nav .nav-item {
        margin: 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .main-nav .nav-link {
        padding: 15px 20px;
    }

    .main-nav .dropdown-menu {
        position: static;
        box-shadow: none;
        border-top: 1px solid #f0f0f0;
        padding-left: 20px;
    }

    .main-nav .nav-item.dropdown:hover .dropdown-menu {
        display: none; /* Managed by JS on mobile */
    }

    .menu-toggle {
        display: block; /* Show on mobile */
        order: 2;
        position: absolute;
        right: 20px;
        top: 25px;
    }

    .utility-nav {
        width: 100%;
        justify-content: flex-end;
        order: 2; /* Position utility nav next to toggle */
        margin-top: 10px;
    }
    
    .utility-nav .search-box {
        margin-left: 0;
        margin-top: 10px;
        width: 100%;
    }

    .utility-nav .search-box input {
        width: calc(100% - 40px);
    }
    
    .main-footer .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .main-footer .social-links {
        justify-content: center;
        display: flex;
    }
    
    .main-footer .newsletter-form input[type="email"] {
        width: calc(100% - 110px); /* Adjust for button */
    }
}

@media (max-width: 480px) {
    .main-header .logo a {
        font-size: 20px;
    }
    .main-header .logo-img {
        height: 35px;
    }
    .main-footer .newsletter-form input[type="email"] {
        width: 100%;
        border-radius: 4px;
        margin-bottom: 10px;
    }
    .main-footer .newsletter-form .subscribe-button {
        width: 100%;
        border-radius: 4px;
    }
}
/* 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;
  }
}