/* Base styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --text-color: #333;
    --heading-color: #222;
    --border-color: #dee2e6;
    --font-family-base: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-headings: 'Montserrat', sans-serif;
    --container-max-width: 1200px;
}

body {
    font-family: var(--font-family-base);
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    background-color: var(--light-color);
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 15px;
}

/* Header styles */
.site-header {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

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

.site-header .branding .logo img {
    height: 40px;
    width: auto;
}

.site-header .main-nav .nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
}

.site-header .main-nav .nav-item a {
    text-decoration: none;
    color: var(--heading-color);
    font-weight: 500;
    padding: 5px 0;
    display: block;
    transition: color 0.3s ease;
}

.site-header .main-nav .nav-item a:hover {
    color: var(--primary-color);
}

.site-header .main-nav .has-dropdown {
    position: relative;
}

.site-header .main-nav .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    min-width: 180px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    z-index: 1000;
    list-style: none;
    padding: 10px 0;
    margin: 0;
    border-radius: 4px;
}

.site-header .main-nav .has-dropdown:hover .dropdown-menu,
.site-header .main-nav .has-dropdown.active .dropdown-menu {
    display: block;
}

.site-header .main-nav .dropdown-menu li a {
    padding: 8px 20px;
    white-space: nowrap;
}

.site-header .header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.site-header .search-box {
    position: relative;
}

.site-header .search-box input[type="search"] {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 20px;
    outline: none;
    transition: border-color 0.3s ease;
}

.site-header .search-box input[type="search"]:focus {
    border-color: var(--primary-color);
}

.site-header .search-box button {
    background: none;
    border: none;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--secondary-color);
}

.btn {
    padding: 8px 15px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    border: 1px solid var(--primary-color);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.menu-toggle {
    display: none; /* Hidden by default, shown on smaller screens */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.menu-toggle .icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: all 0.3s ease;
}

.announcement-bar {
    background-color: var(--info-color);
    color: #fff;
    text-align: center;
    padding: 10px 0;
    margin-top: 15px;
    border-radius: 5px;
}

.announcement-bar a {
    color: #fff;
    text-decoration: underline;
    font-weight: 600;
}

/* Footer styles */
.site-footer {
    background-color: var(--dark-color);
    color: #f0f0f0;
    padding: 40px 0 20px;
    margin-top: 50px;
    font-size: 0.9em;
}

.site-footer h3 {
    color: #fff;
    font-size: 1.1em;
    margin-bottom: 20px;
    position: relative;
}

.site-footer h3::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
    margin-top: 8px;
}

.site-footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.site-footer .footer-col p {
    margin-bottom: 10px;
    line-height: 1.8;
}

.site-footer .footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.site-footer .footer-col a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.site-footer .footer-col a:hover {
    color: var(--primary-color);
}

.site-footer .social-links {
    margin-top: 20px;
    display: flex;
    gap: 15px;
}

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

.site-footer .social-links a:hover img {
    filter: invert(0.5) sepia(1) saturate(20) hue-rotate(175deg); /* Changes to primary color */
}

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

.site-footer .newsletter-form input[type="email"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #555;
    background-color: #444;
    color: #fff;
    border-radius: 5px;
    margin-bottom: 10px;
    box-sizing: border-box;
}

.site-footer .newsletter-form input[type="email"]::placeholder {
    color: #aaa;
}

.site-footer .btn-subscribe {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.site-footer .btn-subscribe:hover {
    background-color: #0056b3;
}

.site-footer .footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    margin-top: 30px;
    text-align: center;
    color: #aaa;
}

.site-footer .footer-bottom .footer-disclaimer {
    display: block;
    margin-top: 10px;
    font-size: 0.85em;
    color: #888;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .site-header .main-nav .nav-list {
        gap: 15px;
    }
}

@media (max-width: 768px) {
    .site-header .header-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-header .branding {
        width: 100%;
        text-align: center;
        margin-bottom: 15px;
    }

    .site-header .main-nav {
        width: 100%;
        order: 3; /* Move navigation below actions on small screens */
    }

    .site-header .main-nav .nav-list {
        flex-direction: column;
        width: 100%;
        display: none; /* Hidden by default on mobile */
        background-color: #f8f8f8;
        border-top: 1px solid var(--border-color);
        padding: 10px 0;
    }

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

    .site-header .main-nav .nav-item {
        width: 100%;
        border-bottom: 1px solid #eee;
    }

    .site-header .main-nav .nav-item:last-child {
        border-bottom: none;
    }

    .site-header .main-nav .nav-item a {
        padding: 12px 15px;
    }

    .site-header .main-nav .dropdown-menu {
        position: static;
        box-shadow: none;
        background-color: #e9e9e9;
        border-radius: 0;
        padding-left: 20px;
        width: 100%;
    }

    .site-header .main-nav .header-actions {
        width: 100%;
        justify-content: center;
        margin-top: 15px;
        order: 2;
    }

    .site-header .search-box {
        flex-grow: 1;
        margin-right: 10px;
    }

    .site-header .search-box input[type="search"] {
        width: 100%;
    }

    .menu-toggle {
        display: block;
        align-self: flex-end;
        margin-top: -50px; /* Adjust positioning */
        position: absolute;
        right: 15px;
    }

    .announcement-bar {
        margin-top: 25px; /* Adjust for mobile header layout */
    }

    .site-footer .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .site-footer .footer-col h3::after {
        margin-left: auto;
        margin-right: auto;
    }

    .site-footer .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .site-header .header-actions {
        flex-direction: column;
        gap: 10px;
    }
    .site-header .search-box {
        margin-right: 0;
    }
    .btn {
        width: 100%;
        text-align: center;
    }
}
/* 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;
  }
}