/* Basic Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    -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 #eee;
    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;
}

.logo img {
    height: 40px;
    width: auto;
}

.main-nav .nav-list {
    list-style: none;
    display: flex;
    gap: 20px;
}

.main-nav .nav-item a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    padding: 5px 0;
    transition: color 0.3s ease;
}

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

.main-nav .dropdown {
    position: relative;
}

.main-nav .dropdown-menu {
    display: none;
    position: absolute;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    list-style: none;
    min-width: 160px;
    z-index: 100;
    padding: 10px 0;
    border-radius: 4px;
}

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

.main-nav .dropdown-menu li a {
    padding: 8px 15px;
    display: block;
    white-space: nowrap;
}

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 5px;
}

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

.promo-banner {
    background-color: #ffeb3b;
    color: #333;
    text-align: center;
    padding: 10px 0;
    font-size: 0.9em;
}

.promo-banner .promo-link {
    color: #007bff;
    text-decoration: underline;
    margin-left: 5px;
}

.sub-header {
    background-color: #f8f9fa;
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
}

.breadcrumb {
    list-style: none;
    display: flex;
    font-size: 0.9em;
}

.breadcrumb li + li::before {
    content: ' / ';
    margin: 0 5px;
    color: #6c757d;
}

.breadcrumb li a {
    text-decoration: none;
    color: #007bff;
}

.breadcrumb li a:hover {
    text-decoration: underline;
}

/* Footer Styles */
.main-footer {
    background-color: #222;
    color: #f8f8f8;
    padding: 40px 0 20px;
    font-size: 0.9em;
}

.main-footer a {
    color: #007bff;
    text-decoration: none;
}

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

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

.footer-col h4 {
    color: #fff;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.footer-col ul {
    list-style: none;
}

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

.footer-col address p {
    margin-bottom: 8px;
}

.social-media a {
    display: inline-block;
    margin-right: 10px;
}

.social-media img {
    width: 24px;
    height: 24px;
    vertical-align: middle;
}

.newsletter form {
    display: flex;
    margin-top: 10px;
}

.newsletter input[type="email"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #555;
    border-radius: 4px 0 0 4px;
    background-color: #333;
    color: #fff;
}

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

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

.newsletter-description {
    margin-top: 10px;
    color: #ccc;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    color: #aaa;
}

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

/* Utility classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 1em;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
    border: 1px solid #6c757d;
}

.btn-secondary:hover {
    background-color: #5a6268;
    border-color: #545b62;
}

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

    .main-nav {
        width: 100%;
        margin-top: 15px;
    }

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

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

    .main-nav .nav-item {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid #eee;
    }

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

    .main-nav .nav-item a {
        padding: 10px 0;
        display: block;
    }

    .menu-toggle {
        display: block; /* Show on mobile */
        align-self: flex-end;
    }

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

    .main-nav .dropdown:hover .dropdown-menu {
        display: none; /* Hide on hover for mobile, JS will handle toggle */
    }
    .main-nav .dropdown.active .dropdown-menu {
        display: block;
    }

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

    .footer-col ul {
        padding-left: 0;
    }

    .social-media {
        justify-content: center;
        display: flex;
    }

    .newsletter form {
        flex-direction: column;
        align-items: center;
    }

    .newsletter input[type="email"] {
        border-radius: 4px;
        margin-bottom: 10px;
        width: 80%;
    }

    .newsletter button {
        border-radius: 4px;
        width: 80%;
    }
}
/* 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;
  }
}