/* Global Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f8f8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5em;
    font-weight: 600;
    color: #222;
}

p {
    margin-bottom: 1em;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    border: 1px solid transparent;
}

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

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

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

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

.btn-subscribe {
    background-color: #28a745;
    color: #fff;
    border-color: #28a745;
}

.btn-subscribe:hover {
    background-color: #218838;
    border-color: #1e7e34;
}

/* Header Specific Styles (for example purposes) */
.main-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo-area {
    display: flex;
    align-items: center;
}

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

.site-name {
    font-size: 24px;
    font-weight: 700;
    color: #333;
}

.main-nav .nav-list {
    display: flex;
    gap: 25px;
}

.main-nav .nav-link {
    font-weight: 500;
    color: #555;
    padding: 5px 0;
    position: relative;
}

.main-nav .nav-link:hover {
    color: #007bff;
    text-decoration: none;
}

.nav-item.has-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    border-radius: 5px;
    min-width: 180px;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    padding: 10px 0;
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown.hover-active .dropdown-menu,
.nav-item.has-dropdown.click-active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 15px;
    color: #333;
    white-space: nowrap;
}

.dropdown-menu a:hover {
    background-color: #f0f0f0;
    text-decoration: none;
}

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

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

.icon-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 5px 0;
    transition: all 0.3s ease;
}

/* Footer Specific Styles (for example purposes) */
.main-footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 40px 0 20px;
    font-size: 14px;
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 30px;
}

.footer-section {
    flex: 1;
    min-width: 200px;
    margin-bottom: 20px;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 18px;
}

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

.footer-section ul {
    padding: 0;
}

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

.footer-section ul li a {
    color: #bdc3c7;
}

.footer-section ul li a:hover {
    color: #fff;
    text-decoration: underline;
}

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

.social-media img {
    height: 24px;
    width: 24px;
    filter: brightness(0) invert(1); /* Make icons white */
    transition: transform 0.3s ease;
}

.social-media a:hover img {
    transform: translateY(-3px);
}

.newsletter-form {
    display: flex;
    margin-top: 15px;
}

.newsletter-form input[type="email"] {
    flex-grow: 1;
    padding: 10px 15px;
    border: 1px solid #555;
    border-radius: 5px 0 0 5px;
    background-color: #34495e;
    color: #ecf0f1;
    outline: none;
}

.newsletter-form input[type="email"]::placeholder {
    color: #bdc3c7;
}

.newsletter-form .btn-subscribe {
    border-radius: 0 5px 5px 0;
    padding: 10px 18px;
    font-size: 15px;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 20px;
    margin-top: 30px;
}

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

.copyright, .icp-info {
    margin: 0;
    color: #bdc3c7;
}

.legal-links {
    display: flex;
    gap: 20px;
}

.legal-links li a {
    color: #bdc3c7;
}

.legal-links li a:hover {
    color: #fff;
}

/* Responsive Adjustments */
@media (max-width: 992px) {
    .main-nav {
        display: none; /* Hide main nav on smaller screens */
        flex-direction: column;
        position: absolute;
        top: 70px; /* Adjust based on header height */
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        padding: 15px 0;
        z-index: 999;
        transform: translateY(-100%);
        transition: transform 0.3s ease-out;
    }
    .main-nav.active {
        display: flex;
        transform: translateY(0);
    }
    .main-nav .nav-list {
        flex-direction: column;
        gap: 0;
    }
    .main-nav .nav-item {
        width: 100%;
        border-bottom: 1px solid #eee;
    }
    .main-nav .nav-item:last-child {
        border-bottom: none;
    }
    .main-nav .nav-link {
        padding: 12px 20px;
        display: block;
    }
    .menu-toggle {
        display: block; /* Show hamburger icon */
    }
    .header-container {
        justify-content: space-between;
    }
    .user-actions {
        gap: 10px;
    }
    .footer-container {
        flex-direction: column;
        align-items: flex-start;
    }
    .footer-section {
        min-width: unset;
        width: 100%;
    }
    .bottom-container {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    .legal-links {
        flex-direction: column;
        gap: 8px;
    }
    .dropdown-menu {
        position: static;
        box-shadow: none;
        border-radius: 0;
        min-width: auto;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        background-color: #f9f9f9;
        padding-left: 20px;
        display: none;
    }
    .nav-item.has-dropdown.click-active .dropdown-menu {
        display: block;
    }
    .nav-item.has-dropdown > .nav-link {
        padding-right: 40px;
        position: relative;
    }
    .nav-item.has-dropdown > .nav-link::after {
        content: '+';
        position: absolute;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        font-size: 1.2em;
        transition: transform 0.3s ease;
    }
    .nav-item.has-dropdown.click-active > .nav-link::after {
        content: '-';
        transform: translateY(-50%) rotate(0deg);
    }
}
/* 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;
  }
}