/* Basic Reset & Global Styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #28a745;
    --text-color: #343a40;
    --light-bg: #f8f9fa;
    --dark-bg: #343a40;
    --white: #ffffff;
    --font-family-sans: 'Arial', sans-serif;
    --font-family-serif: 'Georgia', serif;
    --spacing-unit: 1rem;
}

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

body {
    font-family: var(--font-family-sans);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex-grow: 1;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

/* Header Styles */
.site-header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: calc(var(--spacing-unit) * 0.75) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.branding {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--dark-bg);
    white-space: nowrap;
}

.site-logo {
    height: 40px;
    margin-right: 10px;
    border-radius: 5px;
}

.site-title {
    display: block;
    line-height: 1.2;
}

.main-navigation {
    flex-grow: 1;
    text-align: center;
}

.nav-menu {
    display: flex;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 1.5);
}

.nav-menu .menu-item {
    position: relative;
}

.nav-menu .menu-item a {
    display: block;
    padding: 10px 0;
    color: var(--text-color);
    font-weight: 500;
    position: relative;
}

.nav-menu .menu-item a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu .menu-item a:hover::after,
.nav-menu .current-menu-item a::after {
    width: 100%;
}

.nav-menu .menu-item a:hover,
.nav-menu .current-menu-item a {
    color: var(--primary-color);
}

.nav-menu .sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    min-width: 220px;
    z-index: 10;
    border-top: 3px solid var(--primary-color);
    padding: 10px 0;
    border-radius: 0 0 5px 5px;
}

.nav-menu .menu-item-has-children:hover > .sub-menu {
    display: block;
}

.nav-menu .sub-menu .menu-item a {
    padding: 10px 20px;
    white-space: nowrap;
    border-bottom: 1px solid #eee;
}

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

.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    padding: 5px;
    transition: color 0.3s ease;
}

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

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

.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(4) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}

.search-toggle, .cart-link {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-color);
    position: relative;
    padding: 5px;
    transition: color 0.3s ease;
}

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

.cart-count {
    background-color: var(--accent-color);
    color: var(--white);
    font-size: 0.7rem;
    border-radius: 50%;
    padding: 2px 6px;
    position: absolute;
    top: -8px;
    right: -8px;
    min-width: 20px;
    text-align: center;
    line-height: 1;
}

.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 {
    display: flex;
    width: 90%;
    max-width: 700px;
    background-color: var(--white);
    padding: 25px;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.search-form input[type="search"] {
    flex-grow: 1;
    padding: 12px 18px;
    border: 1px solid var(--secondary-color);
    border-radius: 5px;
    font-size: 1.1rem;
    outline: none;
}

.search-form input[type="search"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.search-form button[type="submit"] {
    padding: 12px 25px;
    margin-left: 10px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    font-weight: bold;
}

.search-form button[type="submit"]:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
}

.close-search {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 2.2rem;
    color: var(--text-color);
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s ease, transform 0.2s ease;
}

.close-search:hover {
    color: var(--primary-color);
    transform: rotate(90deg);
}

/* Footer Styles */
.site-footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: calc(var(--spacing-unit) * 3) 0 calc(var(--spacing-unit) * 1.5);
    font-size: 0.9rem;
    position: relative;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 2.5);
}

.footer-col h3 {
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 1.25);
    font-size: 1.3rem;
    position: relative;
    padding-bottom: 5px;
}

.footer-col h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background-color: var(--accent-color);
}

.footer-col p {
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    color: #bbb;
}

.footer-col ul {
    padding: 0;
}

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

.footer-col ul li a {
    color: var(--white);
    transition: color 0.3s ease;
    display: inline-block;
    position: relative;
}

.footer-col ul li a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 1px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

.footer-col ul li a:hover::after {
    width: 100%;
}

.social-links {
    margin-top: calc(var(--spacing-unit) * 1.25);
    display: flex;
    gap: var(--spacing-unit);
}

.social-links a {
    color: var(--white);
    font-size: 1.6rem;
    transition: color 0.3s ease, transform 0.2s ease;
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.contact-info p i {
    margin-right: 10px;
    color: var(--primary-color);
    width: 20px;
    text-align: center;
}

.newsletter-form {
    display: flex;
    margin-top: calc(var(--spacing-unit) * 1);
    flex-wrap: wrap;
}

.newsletter-form input[type="email"] {
    flex-grow: 1;
    padding: 10px 15px;
    border: 1px solid #555;
    border-radius: 3px 0 0 3px;
    background-color: #444;
    color: var(--white);
    outline: none;
    min-width: 150px;
}

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

.newsletter-form button {
    padding: 10px 20px;
    background-color: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: 0 3px 3px 0;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    font-weight: bold;
}

.newsletter-form button:hover {
    background-color: #218838;
    transform: translateY(-1px);
}

.newsletter-disclaimer {
    margin-top: 10px;
    font-size: 0.8rem;
    color: #aaa;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: calc(var(--spacing-unit) * 1.25);
    margin-top: calc(var(--spacing-unit) * 2);
    text-align: center;
}

.footer-bottom p {
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    color: #bbb;
}

.footer-legal-links a {
    color: #bbb;
    margin: 0 10px;
    transition: color 0.3s ease;
}

.footer-legal-links a:hover {
    color: var(--primary-color);
}

#back-to-top {
    display: none; /* Hidden by default */
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    font-size: 1.5rem;
    border: none;
    outline: none;
    background-color: var(--primary-color);
    color: var(--white);
    cursor: pointer;
    padding: 15px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease, transform 0.3s ease, opacity 0.3s ease;
}

#back-to-top:hover {
    background-color: #0056b3;
    transform: translateY(-3px);
}

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

.button {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: bold;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
}

.primary-button {
    background-color: var(--primary-color);
    color: var(--white);
    border: 1px solid var(--primary-color);
}

.primary-button:hover {
    background-color: #0056b3;
    border-color: #0056b3;
    color: var(--white);
    transform: translateY(-1px);
}

.secondary-button {
    background-color: var(--secondary-color);
    color: var(--white);
    border: 1px solid var(--secondary-color);
}

.secondary-button:hover {
    background-color: #5a6268;
    border-color: #5a6268;
    color: var(--white);
    transform: translateY(-1px);
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .main-navigation {
        order: 3;
        flex-basis: 100%;
        margin-top: calc(var(--spacing-unit) * 1);
    }

    .nav-menu {
        flex-direction: column;
        display: none; /* Hidden by default for mobile */
        text-align: left;
        background-color: var(--white);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        padding: 10px 0;
        border-radius: 5px;
        width: 100%;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu .menu-item a {
        padding: 12px 20px;
        border-bottom: 1px solid #eee;
    }

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

    .nav-menu .sub-menu {
        position: static;
        box-shadow: none;
        border-top: none;
        background-color: #f2f2f2;
        padding-left: 30px;
        width: 100%;
        border-radius: 0;
    }

    .menu-toggle {
        display: block; /* Show on mobile */
        order: 2;
    }

    .header-actions {
        order: 1;
    }

    .branding {
        order: 0;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .search-form {
        width: 95%;
        padding: 20px;
    }

    .search-form input[type="search"] {
        padding: 10px 15px;
    }

    .search-form button[type="submit"] {
        padding: 10px 15px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: row;
        justify-content: space-between;
    }

    .branding {
        flex-grow: 1;
        justify-content: flex-start;
    }

    .header-actions {
        order: 1;
        margin-left: auto;
    }

    .menu-toggle {
        order: 2;
        margin-left: 15px;
    }

    .main-navigation {
        order: 4;
        margin-top: 15px;
        width: 100%;
    }

    .site-title {
        display: none;
    }

    .site-logo {
        height: 35px;
    }

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

    .footer-col h3::after {
        left: 50%;
        transform: translateX(-50%);
    }

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

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

    .newsletter-form input[type="email"] {
        border-radius: 3px;
        margin-bottom: 10px;
        width: 100%;
        max-width: 300px;
    }

    .newsletter-form button {
        border-radius: 3px;
        width: 100%;
        max-width: 300px;
    }

    #back-to-top {
        bottom: 20px;
        right: 20px;
        padding: 12px;
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .logo-link {
        font-size: 1.5rem;
    }

    .site-logo {
        height: 30px;
        margin-right: 5px;
    }

    .header-actions {
        gap: 10px;
    }

    .search-toggle, .cart-link {
        font-size: 1rem;
    }

    .search-form {
        padding: 15px;
    }

    .search-form input[type="search"] {
        padding: 8px 10px;
        font-size: 1rem;
    }

    .search-form button[type="submit"] {
        padding: 8px 15px;
        font-size: 0.9rem;
    }

    .close-search {
        font-size: 1.8rem;
        top: 10px;
        right: 10px;
    }

    .footer-col h3 {
        font-size: 1.1rem;
    }

    .social-links a {
        font-size: 1.3rem;
    }

    .footer-bottom p, .footer-legal-links a {
        font-size: 0.8rem;
    }
}
/* 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;
  }
}