:root {
    --primary-color: #4A90E2; /* 蓝色 */
    --secondary-color: #50E3C2; /* 青色 */
    --text-color-dark: #333333;
    --text-color-light: #666666;
    --background-color: #f4f7f6;
    --card-background: #ffffff;
    --border-color: #e0e0e0;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 5px 15px rgba(0, 0, 0, 0.08);
}

/* 全局样式 */
body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color-dark);
    line-height: 1.6;
}

/* 通用卡片样式 */
.card {
    background: var(--card-background);
    border-radius: 12px; /* 更柔和的圆角 */
    box-shadow: var(--shadow-medium); /* 更明显的阴影 */
    padding: 25px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

/* 用户设置下拉菜单 */
.user-settings-dropdown {
    position: relative;
    display: inline-block;
    margin-left: 15px;
}

.user-settings-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.user-settings-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.user-settings-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: var(--shadow-medium);
    min-width: 180px;
    z-index: 1000;
    display: none;
}

.user-settings-menu.active {
    display: block;
}

.user-settings-menu .menu-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-color-dark);
    text-decoration: none;
    transition: background-color 0.3s;
    border: none;
    width: 100%;
    text-align: left;
    background: none;
    cursor: pointer;
    position: relative; /* For submenu positioning */
    box-sizing: border-box;
}

.user-settings-menu .menu-item:hover {
    background-color: #f8f9fa;
}

.user-settings-menu .menu-item i {
    margin-right: 10px;
    color: var(--text-color-light);
}

.menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* 语言二级菜单 */
.language-menu-item .submenu-arrow {
    margin-left: auto; /* Push arrow to the right */
    transition: transform 0.3s;
}

.language-menu-item:hover .submenu-arrow {
    transform: rotate(90deg);
}

.language-submenu {
    position: absolute;
    right: 100%;
    top: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: var(--shadow-medium);
    min-width: 150px;
    z-index: 1001;
    display: none;
}

.language-submenu.active {
    display: block;
}

.language-submenu .submenu-item {
    display: block;
    padding: 10px 15px;
    color: var(--text-color-dark);
    text-decoration: none;
    transition: background-color 0.3s;
}

.language-submenu .submenu-item:hover {
    background-color: #f0f0f0;
}

/* 消息容器样式 */
#messageContainer {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1002;
    max-width: 90%;
    width: 400px;
}

.message {
    padding: 12px 20px;
    margin-bottom: 10px;
    border-radius: 4px;
    color: #fff;
    text-align: center;
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    animation: fadeIn 0.3s ease;
}

.message-success {
    background-color: #4CAF50;
}

.message-error {
    background-color: #f44336;
}

.message-info {
    background-color: #2196F3;
}

.message-warning {
    background-color: #ff9800;
}

.message-close {
    position: absolute;
    top: 5px;
    right: 10px;
    font-size: 20px;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.3s ease;
}

.message-close:hover {
    color: white;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}