* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

.flex {
    display: flex;
}

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

.flex-start {
    display: flex;
    align-items: flex-start;
}

.flex-center-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

body {
    color: #333;
    line-height: 1.6;
}

#app {
    width: 100%;
    max-width: 1380px;
    margin: 20px auto;
    padding: 0 15px;
}

.container {
    width: 100%;
    max-width: 1380px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 顶部日期天气栏 */
.top-bar {
    background-color: #fff;
    border-bottom: 1px solid #ddd;
    padding: 4px 0 4px;
    width: 100%;
}

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

.date-weather-bar {
    display: flex;
    gap: 0px;
    font-size: 14px;
    color: #555;
    flex-wrap: wrap;
    font-weight: 500;
}

.date-info {
    display: flex;
    gap: 10px;
}

.weather-info {
    display: flex;
    gap: 5px;
}

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

.login-button {
    width: 67px;
    height: 32px;
    padding: 5px 15px;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
    background: url("../images/login_button.png") no-repeat;
    background-size: cover;
}

/* 标题图片 */
.header-image {
    width: 100%;
    text-align: center;
    padding: 20px 0;
    background: url("../images/title_bg.png") no-repeat;
    background-size: cover;
}

    .header-image img {
        max-width: 45%;
        height: auto;
    }

/* 标题下方的搜索栏 */
.title-search {
    width: 100%;
    padding: 15px 0;
    text-align: center;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    padding: 0 15px;
    margin-top: 60px;
}

    .search-container input[type="text"] {
        flex: 1;
        padding: 8px 40px 10px;
        border: 1px solid #1d6312;
        border-radius: 4px 0 0 4px;
        font-size: 16px;
        color: #999999;
        background: #fff url("../images/search_icon.png") 15px 50% no-repeat;
    }

    .search-container input:focus {
        outline: none;
    }

    .search-container a {
        padding: 0 20px;
        background-color: #1d6312;
        color: white;
        border: none;
        border-radius: 0 4px 4px 0;
        cursor: pointer;
        font-size: 16px;
        transition: background-color 0.3s;
        text-decoration: none;
        line-height: 40px;
    }

        .search-container a:hover {
            background-color: #1d6312;
        }

/* 导航栏样式 */
/* 导航栏基础样式 */
nav {
    background-color: #1d6312;
    width: 100%;
    position: relative;
    z-index: 1000;
}

    nav .container {
        position: relative;
    }

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

        nav ul li {
            position: relative;
            padding: 12px 15px;
        }

            nav ul li a {
                color: white;
                text-decoration: none;
                font-weight: 400;
                padding: 12px 0;
                display: block;
                position: relative;
                transition: all 0.3s ease;
            }

    /* 选中效果 */
    nav > .container > ul > li > a.active::before {
        content: "";
        position: absolute;
        bottom: -12px;
        left: 0;
        width: 100%;
        height: 4px;
        background-color: #ffd226;
        animation: navUnderline 0.3s ease-out;
        z-index: 1001;
    }

/* 二级菜单样式 */
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 100%;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 1001;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: 0 0 4px 4px;
    white-space: nowrap;
}

    .submenu li {
        padding: 0;
        border-bottom: 1px solid #eee;
    }

        .submenu li:last-child {
            border-bottom: none;
        }

    .submenu a {
        color: #333 !important;
        padding: 10px 15px !important;
        display: block;
        transition: all 0.2s;
    }

        .submenu a:hover {
            background-color: #1d631230;
            color: #1d6312 !important;
        }

.has-submenu:hover .submenu {
    display: block;
    opacity: 1;
}

/* 响应式设计 - 媒体查询 */

/* 中等屏幕设备 (992px-1200px) */
@media (max-width: 1200px) {
    nav ul li {
        padding: 12px 10px;
    }

        nav ul li a {
            font-size: 15px;
            padding: 12px 5px;
        }

    .submenu {
        min-width: 180px;
    }
}

/* 平板设备 (768px-992px) */
@media (max-width: 992px) {
    nav ul {
        flex-wrap: wrap;
    }

        nav ul li {
            padding: 8px 10px;
            flex: 1 0 auto;
        }

            nav ul li a {
                font-size: 14px;
                padding: 8px 5px;
            }

    nav > .container > ul > li > a.active::before {
        bottom: -8px;
        height: 3px;
    }

    .submenu {
        min-width: 160px;
    }
}

/* 小型平板/大手机 (576px-768px) */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        display: none; /* 默认隐藏，通过JS控制显示 */
    }

        nav ul.active {
            display: flex;
        }

        nav ul li {
            padding: 10px 15px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

            nav ul li:last-child {
                border-bottom: none;
            }

    .has-submenu {
        position: relative;
    }

    /* 移动端二级菜单样式 */
    .submenu {
        position: static;
        display: none;
        box-shadow: none;
        background-color: rgba(0, 0, 0, 0.05);
        width: 100%;
        border-radius: 0;
    }

        .submenu.active {
            display: block;
            opacity: 1;
        }

        .submenu li {
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

    /* 移动端菜单切换按钮 */
    .mobile-menu-toggle {
        display: block;
        padding: 15px;
        color: white;
        text-align: right;
        cursor: pointer;
    }

        .mobile-menu-toggle::before {
            content: "☰";
            font-size: 24px;
        }

        .mobile-menu-toggle.active::before {
            content: "×";
        }

    /* 隐藏桌面版箭头 */
    nav > .container > ul > li.has-submenu > a::after {
        display: none;
    }

    /* 移动版箭头/加号 */
    .has-submenu > a::after {
        content: "+";
        float: right;
        transition: transform 0.3s;
    }

    .has-submenu.active > a::after {
        content: "-";
    }

    .has-submenu .submenu {
        position: static;
        visibility: hidden;
        opacity: 0;
        height: 0;
        overflow: hidden;
        transition: opacity 0.3s ease, height 0.3s ease;
        background-color: rgba(0, 0, 0, 0.05);
        width: 100%;
        border-radius: 0;
    }

    .has-submenu.active .submenu {
        visibility: visible;
        opacity: 1;
        height: auto;
        display: block;
    }
}

.has-submenu .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 100%;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 1001;
    /* 移除 display:none 和 opacity:0 */
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    border-radius: 0 0 4px 4px;
    white-space: nowrap;
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
    visibility: visible;
    opacity: 1;
}

/* 小手机设备 (小于576px) */
@media (max-width: 576px) {
    nav ul li {
        padding: 8px 15px;
    }

    .mobile-menu-toggle {
        padding: 12px 15px;
    }
}

/* 页脚 */
footer {
    background-color: #464646;
    color: white;
    padding: 20px 0;
    text-align: center;
    font-size: 14px;
    width: 100%;
}

.footer_logo {
    position: absolute;
    left: 0;
    max-width: 150px;
    height: auto;
    transition: all 0.3s ease;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .submenu li {
        width: 100%;
    }
}

@media (max-width: 992px) {
    .footer_logo {
        max-width: 120px;
    }

    .submenu li {
        width: 50%;
    }
}



@media (max-width: 576px) {
    .header-image img {
        max-width: 80%;
    }

    .search-container {
        margin-top: 30px;
    }

    .footer_logo {
        max-width: 80px;
        position: relative;
        left: auto;
        display: block;
        margin: 0 auto 10px;
    }

    .submenu li {
        width: 100%;
    }
}

/* 媒体查询 - 平板设备 (768px 以上) */
@media (min-width: 768px) {
    #app {
        width: 100%;
    }

    .header-image {
        padding: 80px 0;
    }

    .container {
        padding: 0 30px;
    }
}

/* 媒体查询 - 桌面设备 (992px 以上) */
@media (min-width: 992px) {
    #app {
        width: 100%;
    }

    main .container {
        gap: 30px;
    }

    .main-content {
        flex: 3;
    }

    .sidebar {
        flex: 1;
        margin-top: 0;
    }
}

/* 媒体查询 - 大桌面设备 (1200px 以上) */
@media (min-width: 1380px) {
    #app {
        width: 100%;
    }

    .container {
        padding: 0;
    }

    .search-container {
        padding: 0;
    }
}