/* Shared CSS for header and footer */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --text-color: #333;
    --background-color: #f8f9fa;
    --border-color: #dee2e6;
    --light-gray: #f2f2f2;
    --dark-gray: #555;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: #fff;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header styles */
.main-header {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    position: relative;
    z-index: 1000;
}

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

.main-header .logo img {
    height: 40px;
    max-width: 100%;
}

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

.main-nav ul li {
    position: relative;
    margin: 0 15px;
}

.main-nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 10px 0;
    display: block;
    transition: color 0.3s ease;
}

.main-nav ul li a:hover {
    color: var(--primary-color);
}

.main-nav .submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    min-width: 180px;
    padding: 10px 0;
    z-index: 100;
    border-radius: 4px;
}

.main-nav .submenu li {
    margin: 0;
}

.main-nav .submenu li a {
    padding: 8px 15px;
    white-space: nowrap;
}

.main-nav ul li:hover > .submenu {
    display: block;
}

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

.header-actions button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.header-actions button:hover {
    color: var(--primary-color);
}

.header-actions .btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    padding: 8px 15px;
    border-radius: 4px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

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

.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-form-wrapper {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    display: flex;
    gap: 10px;
    position: relative;
    max-width: 600px;
    width: 90%;
}

.search-form-wrapper input[type="search"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
}

.search-form-wrapper button {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.search-form-wrapper .search-submit {
    background-color: var(--primary-color);
    color: #fff;
}

.search-form-wrapper .search-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    font-size: 20px;
    color: var(--text-color);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* Footer styles */
.main-footer {
    background-color: #343a40;
    color: #f8f9fa;
    padding: 40px 0 20px;
    font-size: 14px;
}

.main-footer a {
    color: #adb5bd;
    text-decoration: none;
    transition: color 0.3s ease;
}

.main-footer a:hover {
    color: #fff;
}

.main-footer h4 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 16px;
}

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

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

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

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

.main-footer .social-links img {
    filter: invert(1); /* Make icons white */
}

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

.main-footer .newsletter-signup p {
    font-size: 13px;
    color: #ced4da;
    margin-bottom: 10px;
}

.main-footer .newsletter-signup form {
    display: flex;
    gap: 5px;
}

.main-footer .newsletter-signup input[type="email"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #6c757d;
    border-radius: 4px;
    background-color: #495057;
    color: #fff;
}

.main-footer .newsletter-signup button {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.main-footer .footer-bottom {
    border-top: 1px solid #495057;
    padding-top: 20px;
    text-align: center;
    margin-top: 20px;
}

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

@media (max-width: 768px) {
    .main-header .main-nav {
        display: none; /* Hide nav on small screens, will be handled by JS toggle */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        flex-direction: column;
        padding: 10px 0;
    }
    .main-header .main-nav.active {
        display: flex;
    }
    .main-header .main-nav ul {
        flex-direction: column;
        width: 100%;
    }
    .main-header .main-nav ul li {
        margin: 0;
        border-bottom: 1px solid var(--border-color);
    }
    .main-header .main-nav ul li:last-child {
        border-bottom: none;
    }
    .main-header .main-nav ul li a {
        padding: 12px 20px;
    }
    .main-header .main-nav .submenu {
        position: static;
        display: none;
        border: none;
        box-shadow: none;
        padding: 0 0 0 20px;
        background-color: var(--light-gray);
    }
    .main-header .main-nav ul li.active > .submenu {
        display: block;
    }
    .main-header .menu-toggle {
        display: block;
    }
    .main-footer .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .main-footer .social-links {
        justify-content: center;
    }
    .main-footer .newsletter-signup form {
        flex-direction: column;
        gap: 10px;
    }
    .main-footer .newsletter-signup input[type="email"],
    .main-footer .newsletter-signup button {
        width: 100%;
    }
}
/* 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;
  }
}