/* header.php 专用样式 - 无依赖版本 */

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* 导航栏容器 */
.navbar-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 主导航栏 */
.navbar {
    background-color: #343a40;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* 导航栏品牌/logo */
.navbar-brand {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

/* 导航栏整体布局 */
.navbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 导航菜单 */
.navbar-nav {
    display: flex;
    list-style: none;
}

.nav-item {
    margin-left: 1.5rem;
    position: relative;
}

/* 导航链接 */
.nav-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color 0.3s;
    display: block;
}

.nav-link:hover {
    color: white;
}

/* 当前活跃链接 */
.nav-link.active {
    color: white;
    border-bottom: 2px solid #007bff;
}

/* 移动端菜单切换按钮 */
.navbar-toggler {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* 用户信息区域 */
.user-greeting {
    color: rgba(255, 255, 255, 0.8);
    margin-right: 1rem;
}

/* 响应式设计 - 移动端 */
@media (max-width: 768px) {
    .navbar-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .navbar-nav {
        flex-direction: column;
        width: 100%;
        display: none;
    }

    .nav-item {
        margin: 0;
        padding: 0.5rem 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .navbar-toggler {
        display: block;
        position: absolute;
        left: 20px;
        top: 1.4rem;
    }

    .navbar-nav.show {
        display: flex;
        margin-top: 1rem;
    }

    .nav-link {
        padding: 0.5rem 0;
    }
}

/* 主内容区域 */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 120px); /* 减去页眉页脚高度 */
}

/* 页面标题 */
.page-title {
    margin-bottom: 2rem;
    color: #2c3e50;
    font-size: 2rem;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.5rem;
}

/* 页脚 */
.site-footer {
    background-color: #343a40;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

/* 工具类 */
.text-center {
    text-align: center;
}

.mt-3 {
    margin-top: 1rem;
}

.mb-3 {
    margin-bottom: 1rem;
}

/* 登录/注册特定样式 */
.auth-container {
    max-width: 500px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.auth-title {
    margin-bottom: 1.5rem;
    text-align: center;
}

/* 表单输入组 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-control:focus {
    border-color: #007bff;
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.75rem 0.75rem;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #0069d9;
}

.btn-block {
    display: block;
    width: 100%;
}