/* shared.css - 全局样式表 */

/* 通用重置和基础样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #007bff; /* 蓝色 */
    --secondary-color: #6c757d; /* 灰色 */
    --accent-color: #28a745; /* 绿色 */
    --text-color-dark: #333;
    --text-color-light: #f8f9fa;
    --bg-color-light: #ffffff;
    --bg-color-dark: #212529;
    --border-color: #dee2e6;
    --font-family-sans-serif: 'Noto Sans SC', sans-serif, Arial, sans-serif;
    --header-height: 80px;
    --footer-height: auto; /* 动态高度 */
    --container-max-width: 1200px;
    --spacing-unit: 1rem; /* 16px */
}

html {
    scroll-behavior: smooth;
    font-size: 16px; /* 基础字体大小 */
}

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

/* 链接样式 */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease, text-decoration 0.3s ease;
}

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

/* 按钮样式 */
button {
    cursor: pointer;
    border: none;
    background-color: transparent;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    padding: 0;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    border: 1px solid transparent;
    border-radius: 0.25rem;
    transition: all 0.2s ease-in-out;
}

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

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

/* 容器和布局 */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
    width: 100%;
}

/* 主头部样式 */
.main-header {
    background-color: var(--bg-color-light);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}

.header-top-bar {
    background-color: #f8f9fa;
    padding: 0.5rem var(--spacing-unit);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
}

.header-top-bar .contact-info span {
    margin-right: 1.5rem;
}

.header-top-bar .contact-info i,
.header-top-bar .social-media-links i {
    margin-right: 0.3rem;
}

.header-top-bar .social-media-links a {
    color: var(--secondary-color);
    margin-left: 1rem;
    font-size: 1rem;
}

.header-top-bar .social-media-links a:hover {
    color: var(--primary-color);
}

.main-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-unit);
    min-height: var(--header-height);
}

.main-navigation .logo {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-color-dark);
    text-decoration: none;
}

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

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

.main-navigation .nav-links li {
    position: relative;
    margin-left: 2rem;
}

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

.main-navigation .nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.main-navigation .nav-links a:hover::after,
.main-navigation .nav-links a.active::after,
.main-navigation .nav-links a[aria-current="page"]::after {
    width: 100%;
}

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

.main-navigation .dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--bg-color-light);
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    border-radius: 0.25rem;
    overflow: hidden;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 0.5rem;
}

.main-navigation .dropdown-content a {
    color: var(--text-color-dark);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
    white-space: nowrap;
}

.main-navigation .dropdown-content a:hover {
    background-color: #f1f1f1;
    color: var(--primary-color);
    text-decoration: none;
}

.main-navigation .dropdown:hover .dropdown-content {
    display: block;
}

.main-navigation .hamburger-menu {
    display: none; /* 默认隐藏，在移动端显示 */
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.main-navigation .hamburger-menu .bar {
    width: 100%;
    height: 3px;
    background-color: var(--text-color-dark);
    border-radius: 10px;
    transition: all 0.3s ease-in-out;
}

.main-navigation .search-bar {
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0.3rem 1rem;
    background-color: #f1f3f5;
}

.main-navigation .search-bar input {
    border: none;
    background: transparent;
    outline: none;
    padding: 0.2rem 0.5rem;
    font-size: 0.9rem;
    color: var(--text-color-dark);
    width: 150px;
    transition: width 0.3s ease;
}

.main-navigation .search-bar input:focus {
    width: 200px;
}

.main-navigation .search-bar button {
    background: none;
    border: none;
    color: var(--secondary-color);
    cursor: pointer;
    font-size: 1rem;
    padding: 0 0.5rem;
}

.main-navigation .search-bar button:hover {
    color: var(--primary-color);
}

/* 主内容区域 */
main {
    flex: 1; /* 让main区域填充剩余空间 */
    padding: 2rem 0;
}

/* 主页脚样式 */
.main-footer {
    background-color: var(--bg-color-dark);
    color: var(--text-color-light);
    padding: 3rem 0;
    font-size: 0.9rem;
}

.main-footer a {
    color: #a0a0a0;
    text-decoration: none;
}

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

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

.main-footer .footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

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

.main-footer .footer-logo h2 {
    color: var(--text-color-light);
    font-size: 1.8rem;
    margin: 0;
}

.main-footer .footer-column p {
    margin-bottom: 0.8rem;
}

.main-footer .footer-column h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 0.5rem;
}

.main-footer .footer-column h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 2px;
    background-color: var(--accent-color);
}

.main-footer .footer-column ul {
    list-style: none;
}

.main-footer .footer-column ul li {
    margin-bottom: 0.6rem;
}

.main-footer .footer-column ul li a {
    color: #ccc;
    transition: color 0.3s ease;
}

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

.main-footer .contact-details p {
    display: flex;
    align-items: flex-start;
}

.main-footer .contact-details i {
    margin-right: 0.8rem;
    color: var(--accent-color);
    font-size: 1.1rem;
    width: 20px; /* 确保图标对齐 */
    text-align: center;
}

.main-footer .newsletter-form {
    display: flex;
    margin-top: 1rem;
}

.main-footer .newsletter-form input {
    border: 1px solid #444;
    padding: 0.75rem 1rem;
    border-radius: 0.25rem 0 0 0.25rem;
    background-color: #333;
    color: var(--text-color-light);
    flex-grow: 1;
    outline: none;
}

.main-footer .newsletter-form input::placeholder {
    color: #888;
}

.main-footer .newsletter-form button {
    background-color: var(--primary-color);
    color: var(--text-color-light);
    border: 1px solid var(--primary-color);
    padding: 0.75rem 1rem;
    border-radius: 0 0.25rem 0.25rem 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.main-footer .social-media-footer {
    margin-top: 1.5rem;
}

.main-footer .social-media-footer a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    background-color: #444;
    color: var(--text-color-light);
    border-radius: 50%;
    margin-right: 0.75rem;
    font-size: 1.1rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.main-footer .social-media-footer a:hover {
    background-color: var(--primary-color);
    color: var(--text-color-light);
}

.main-footer .footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1.5rem;
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.main-footer .copyright p {
    margin: 0.5rem 0;
    color: #bbb;
}

.main-footer .copyright a {
    color: #bbb;
    margin-right: 1rem;
}

.main-footer .language-selector select {
    background-color: #333;
    color: var(--text-color-light);
    border: 1px solid #444;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    appearance: none; /* Remove default arrow */
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23ffffff%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-6.5%200-12.3%203.2-16.1%208.1-3.8%204.9-4.5%2011.6-1.8%2017.1l128%20168c4.1%205.4%2010.8%208.4%2017.6%208.4s13.5-3%2017.6-8.4l128-168c2.7-5.5%202.1-12.2-1.7-17.1z%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 0.7em top 50%, 0 0;
    background-size: 0.65em auto, 100%;
    cursor: pointer;
}

#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--primary-color);
    color: var(--text-color-light);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 999;
}

#back-to-top.show {
    opacity: 1;
    visibility: visible;
}


/* 响应式设计 */
@media (max-width: 992px) {
    .main-navigation .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--bg-color-light);
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        padding: 1rem 0;
        border-top: 1px solid var(--border-color);
    }

    .main-navigation .nav-links.active {
        display: flex;
    }

    .main-navigation .nav-links li {
        margin: 0;
        text-align: center;
        border-bottom: 1px solid #f0f0f0;
    }

    .main-navigation .nav-links li:last-child {
        border-bottom: none;
    }

    .main-navigation .nav-links a {
        padding: 1rem;
    }

    .main-navigation .dropdown-content {
        position: static;
        box-shadow: none;
        border-radius: 0;
        margin-top: 0;
        background-color: #f8f8f8;
        transform: none;
        width: 100%;
    }

    .main-navigation .dropdown:hover .dropdown-content {
        display: none; /* Hide on hover for mobile, show with JS toggle */
    }

    .main-navigation .dropdown.active .dropdown-content {
        display: block;
    }

    .main-navigation .hamburger-menu {
        display: flex;
    }

    .main-navigation .search-bar {
        position: absolute;
        top: 1rem;
        right: 1rem;
        border: none;
        background: transparent;
    }

    .main-navigation .search-bar input {
        width: 0;
        padding: 0;
        opacity: 0;
        visibility: hidden;
        transition: width 0.3s ease, padding 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
    }

    .main-navigation .search-bar.active input {
        width: 150px;
        padding: 0.2rem 0.5rem;
        opacity: 1;
        visibility: visible;
        border: 1px solid var(--border-color);
        border-radius: 20px;
        background-color: #f1f3f5;
    }

    .main-navigation .search-bar button {
        color: var(--text-color-dark);
        font-size: 1.2rem;
    }

    .header-top-bar {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.5rem 1rem;
    }
    .header-top-bar .contact-info {
        margin-bottom: 0.5rem;
    }

    .main-footer .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .main-footer .copyright {
        margin-bottom: 1rem;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    .main-navigation {
        padding: 0.8rem var(--spacing-unit);
    }
    .main-navigation .logo h1 {
        font-size: 1.5rem;
    }
    .main-navigation .logo img {
        height: 35px;
    }
    .main-footer .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .main-footer .footer-column h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    .main-footer .contact-details p {
        justify-content: center;
    }
    .main-footer .social-media-footer {
        text-align: center;
    }
    .main-footer .newsletter-form {
        max-width: 350px;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 480px) {
    .header-top-bar {
        font-size: 0.8rem;
    }
    .header-top-bar .contact-info span {
        margin-right: 1rem;
    }
    .main-navigation .search-bar.active input {
        width: 100px;
    }
}
/* 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;
  }
}