/* shared.css - 智慧城市综合管理平台通用样式表 */

/* 基础重置与盒模型设置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* 页面主体与字体排版 */
body {
    font-family: 'PingFang SC', 'Helvetica Neue', Helvetica, 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 容器布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* 链接通用样式 */
a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.3s ease, text-decoration 0.3s ease;
}
a:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* 按钮通用样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    text-align: center;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background-color: #007bff;
    color: #fff;
    border-color: #007bff;
}
.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
    color: #fff;
}

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
    border-color: #6c757d;
}
.btn-secondary:hover {
    background-color: #5a6268;
    border-color: #5a6268;
    color: #fff;
}

.btn-info {
    background-color: #17a2b8;
    color: #fff;
    border-color: #17a2b8;
}
.btn-info:hover {
    background-color: #138496;
    border-color: #138496;
    color: #fff;
}

.btn i {
    margin-right: 8px;
}

/* 头部区域 */
.main-header {
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    padding: 15px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1020;
}

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

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

.logo img {
    height: 45px;
    margin-right: 12px;
    border-radius: 3px;
}

.logo h1 {
    font-size: 26px;
    color: #212529;
    margin: 0;
    font-weight: 600;
}

.logo a {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
}

/* 导航菜单 */
.main-nav {
    flex-grow: 1;
    text-align: center;
}

.main-nav .nav-list {
    list-style: none;
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
    margin: 0 15px;
}

.nav-link {
    display: block;
    padding: 10px 0;
    color: #555;
    text-decoration: none;
    font-weight: 500;
    font-size: 17px;
    transition: color 0.3s ease, border-bottom 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    color: #007bff;
    border-bottom: 2px solid #007bff;
    padding-bottom: 8px; /* Adjust padding to keep height consistent */
}

.nav-link.dropdown-toggle i {
    margin-left: 5px;
    font-size: 12px;
    transition: transform 0.3s ease;
}

.nav-item.dropdown:hover .nav-link.dropdown-toggle i {
    transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #fff;
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
    list-style: none;
    min-width: 180px;
    z-index: 1010;
    border-radius: 6px;
    overflow: hidden;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.nav-item.dropdown:hover .dropdown-menu {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    white-space: nowrap;
    font-size: 15px;
}

.dropdown-menu li a:hover {
    background-color: #f1f1f1;
    color: #007bff;
}

/* 用户操作按钮组 */
.user-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* 汉堡菜单切换按钮 (移动端) */
.menu-toggle {
    display: none; /* 默认隐藏 */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    position: relative;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    outline: none;
}

.menu-toggle .icon-bar {
    display: block;
    width: 28px;
    height: 3px;
    background-color: #333;
    border-radius: 2px;
    margin: 5px 0;
    transition: all 0.3s ease;
}

.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    opacity: 0;
}
.menu-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* 主要内容区域 */
.content-area {
    flex: 1; /* 允许主内容区域增长，将页脚推到底部 */
    padding: 40px 0;
}

/* 页脚区域 */
.main-footer {
    background-color: #212529;
    color: #e0e0e0;
    padding: 50px 0;
    font-size: 15px;
    border-top: 5px solid #007bff;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: #ffffff;
    font-size: 19px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background-color: #007bff;
}

.footer-section p, .footer-section ul {
    margin-bottom: 10px;
}

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

.footer-section ul li a {
    color: #b0b0b0;
    text-decoration: none;
    display: block;
    padding: 6px 0;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #007bff;
    text-decoration: underline;
}

.footer-section .social-media {
    margin-top: 20px;
}

.footer-section .social-media a {
    color: #e0e0e0;
    font-size: 22px;
    margin-right: 18px;
    transition: color 0.3s ease, transform 0.3s ease;
}

.footer-section .social-media a:hover {
    color: #007bff;
    transform: translateY(-3px);
}

.footer-section .contact-info i {
    margin-right: 10px;
    color: #007bff;
    width: 20px;
    text-align: center;
}

.newsletter-form {
    display: flex;
    margin-top: 18px;
    border-radius: 5px;
    overflow: hidden;
}

.newsletter-form input[type="email"] {
    flex-grow: 1;
    padding: 12px 15px;
    border: none;
    outline: none;
    background-color: #343a40;
    color: #fff;
    font-size: 15px;
}

.newsletter-form input[type="email"]::placeholder {
    color: #a0a0a0;
}

.btn-subscribe {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 15px;
}

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

.newsletter-note {
    font-size: 13px;
    color: #999;
    margin-top: 10px;
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid #343a40;
    padding-top: 30px;
    margin-top: 30px;
    color: #b0b0b0;
    font-size: 14px;
}

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

/* 滚动到顶部按钮 (通常由JS动态添加和控制) */
.scroll-to-top {
    position: fixed;
    bottom: 25px;
    right: 25px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 50%;
    width: 55px;
    height: 55px;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    transform: translateY(20px);
}

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

.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .main-header .container {
        flex-wrap: wrap;
        justify-content: space-between;
    }
    .logo {
        order: 1;
        flex-basis: auto;
    }
    .user-actions {
        order: 2;
        margin-left: auto; /* Push to right */
        margin-right: 15px; /* Space from toggle */
    }
    .menu-toggle {
        display: flex; /* 显示汉堡菜单 */
        order: 3;
        margin-left: 0; /* Remove auto margin */
    }
    .main-nav {
        order: 4;
        flex-basis: 100%; /* 导航占据整行 */
        margin-top: 15px;
        background-color: #ffffff;
        box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        border-radius: 5px;
        overflow: hidden;
    }
    .main-nav .nav-list {
        flex-direction: column;
        align-items: flex-start;
        display: none; /* 默认隐藏 */
        width: 100%;
        padding: 10px 0;
    }
    .main-nav .nav-list.open {
        display: flex; /* 切换时显示 */
    }
    .nav-item {
        margin: 0;
        width: 100%;
        border-bottom: 1px solid #f0f0f0;
    }
    .nav-item:last-child {
        border-bottom: none;
    }
    .nav-link {
        padding: 12px 20px;
        border-bottom: none; /* Remove underline on mobile */
    }
    .nav-link:hover, .nav-link.active {
        border-bottom: none;
        background-color: #e9ecef;
    }
    .nav-link.dropdown-toggle i {
        position: absolute;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
    }
    .nav-item.dropdown:hover .nav-link.dropdown-toggle i {
        transform: translateY(-50%) rotate(180deg);
    }
    .dropdown-menu {
        position: static;
        box-shadow: none;
        border-radius: 0;
        background-color: #f8f9fa;
        padding: 0 0 0 30px;
        min-width: unset;
        transform: none;
        opacity: 1;
        visibility: visible;
        display: none; /* Controlled by JS for mobile */
    }
    .nav-item.dropdown:hover .dropdown-menu {
        display: none; /* Handled by JS click */
    }
    .dropdown-menu li a {
        padding: 10px 15px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    .footer-section ul {
        text-align: center;
    }
    .footer-section .social-media {
        justify-content: center;
        display: flex;
    }
    .newsletter-form {
        flex-direction: column;
        max-width: 350px;
        margin-left: auto;
        margin-right: auto;
    }
    .newsletter-form input, .newsletter-form button {
        border-radius: 5px;
        margin-bottom: 10px;
    }
    .newsletter-form button {
        margin-bottom: 0;
    }
}

@media (max-width: 576px) {
    .logo h1 {
        font-size: 22px;
    }
    .logo img {
        height: 38px;
    }
    .user-actions {
        gap: 8px;
    }
    .btn {
        padding: 8px 15px;
        font-size: 14px;
    }
    .main-footer {
        padding: 30px 0;
    }
    .footer-grid {
        gap: 25px;
    }
    .scroll-to-top {
        width: 45px;
        height: 45px;
        font-size: 16px;
        bottom: 15px;
        right: 15px;
    }
}

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