/* Basic Reset & Typography */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --text-color: #333;
    --heading-color: #222;
    --border-color: #dee2e6;
    --background-color: #f4f7f6;
    --font-family-sans-serif: 'Inter', 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 1rem;
    --line-height-base: 1.6;
    --spacing-unit: 1rem;
    --container-max-width: 1200px;
    --header-height: 70px;
    --footer-height: auto;
}

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

body {
    font-family: var(--font-family-sans-serif);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--dark-color);
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-sans-serif);
    color: var(--heading-color);
    margin-bottom: var(--spacing-unit);
    line-height: 1.2;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.25rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--light-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
    color: var(--light-color);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--light-color);
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: #545b62;
    border-color: #545b62;
    color: var(--light-color);
}

/* Forms */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: var(--font-size-base);
    color: var(--text-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Header Styles */
.site-header {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: var(--header-height);
}

.site-header .logo img {
    height: 40px; /* Adjust as needed */
    width: auto;
}

.main-nav .nav-list {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.main-nav .nav-item a {
    display: block;
    padding: 0.5rem 0;
    color: var(--heading-color);
    font-weight: 500;
    position: relative;
}

.main-nav .nav-item a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

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

.main-nav .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    min-width: 180px;
    padding: 0.5rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    z-index: 10;
}

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

.main-nav .dropdown-menu li a {
    padding: 0.75rem 1.5rem;
    white-space: nowrap;
    color: var(--text-color);
}

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

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    position: relative;
    z-index: 1001;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 0.5rem;
}

.search-toggle:hover {
    color: var(--primary-color);
}

.search-form {
    display: none; /* Hidden by default, toggled by JS */
    position: absolute;
    right: 0;
    top: 100%; /* Or adjust positioning */
    background-color: #fff;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    min-width: 250px;
    z-index: 9;
}

.search-form input {
    border: 1px solid var(--border-color);
    padding-right: 3rem; /* Space for button */
}

.search-form button {
    position: absolute;
    right: 1.2rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
}

.user-avatar img {
    border-radius: 50%;
    width: 32px;
    height: 32px;
    object-fit: cover;
}

/* Footer Styles */
.site-footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 4rem 0 2rem;
    margin-top: 3rem;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--light-color);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.footer-section p {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-section ul {
    padding: 0;
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.footer-logo img {
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    color: var(--light-color);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.social-links a:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--light-color);
}

.newsletter-form {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.newsletter-form input {
    flex-grow: 1;
    padding: 0.75rem 1rem;
    border-radius: 0.25rem;
    border: none;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--light-color);
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.newsletter-form button {
    padding: 0.75rem 1.25rem;
    border-radius: 0.25rem;
    background-color: var(--primary-color);
    color: var(--light-color);
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    margin: 0;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}

.legal-links {
    display: flex;
    gap: 1.5rem;
}

.legal-links li a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

.legal-links li a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .main-nav .nav-list {
        display: none; /* Hide main nav on smaller screens */
        flex-direction: column;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: #fff;
        border-top: 1px solid var(--border-color);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        padding: 1rem 0;
    }

    .main-nav .nav-list.is-active {
        display: flex;
    }

    .main-nav .nav-item {
        width: 100%;
        text-align: center;
    }

    .main-nav .nav-item a {
        padding: 1rem 0;
        border-bottom: 1px solid var(--border-color);
    }

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

    .main-nav .nav-item.has-dropdown .dropdown-menu {
        position: static;
        width: 100%;
        box-shadow: none;
        border: none;
        padding: 0;
        background-color: var(--background-color);
        transform: none;
        opacity: 1;
        visibility: visible;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }

    .main-nav .nav-item.has-dropdown.is-open .dropdown-menu {
        max-height: 200px; /* Arbitrary max-height for animation */
    }

    .main-nav .dropdown-menu li a {
        padding: 0.75rem 2rem;
        text-align: center;
    }

    .menu-toggle {
        display: block; /* Show toggle button */
    }

    .header-actions {
        order: 3; /* Move actions to end */
    }

    .header-container {
        flex-wrap: wrap;
    }

    .site-header .logo {
        flex-grow: 1;
    }

    .search-form {
        width: calc(100% - 2rem);
        left: 1rem;
        right: 1rem;
        top: calc(var(--header-height) + 10px);
    }
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .legal-links {
        margin-top: 1rem;
    }
}
/* 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;
  }
}