/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}
a {
    text-decoration: none;
    color: #165DFF;
}
a:hover {
    color: #0e4bdb;
}
/* 容器 */
.container {
    width: 95%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
/* 登录/注册卡片 */
.card-login {
    width: 100%;
    max-width: 450px;
    margin: 50px auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(22, 93, 255, 0.08);
    padding: 40px 30px;
    border: 1px solid #eef2f7;
}
/* 通用卡片 */
.card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    padding: 25px;
    margin-bottom: 20px;
    border: none;
}
/* 标题 */
h1, h2, h3, h4 {
    color: #222;
    margin-bottom: 20px;
    font-weight: 600;
}
h1 {
    font-size: 28px;
    text-align: center;
    color: #165DFF;
    margin-bottom: 30px;
}
h2 {
    font-size: 24px;
    border-left: 4px solid #165DFF;
    padding-left: 15px;
}
/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}
input, select, textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    outline: none;
}
input:focus, select:focus, textarea:focus {
    border-color: #165DFF;
    box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
}
textarea {
    min-height: 120px;
    resize: vertical;
}
/* 按钮样式 */
.btn {
    display: inline-block;
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}
.btn-primary {
    background-color: #165DFF;
    color: #fff;
}
.btn-primary:hover {
    background-color: #0e4bdb;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(22, 93, 255, 0.2);
}
.btn-success {
    background-color: #36D399;
    color: #fff;
}
.btn-success:hover {
    background-color: #2cb886;
}
.btn-danger {
    background-color: #F87272;
    color: #fff;
}
.btn-danger:hover {
    background-color: #f65555;
}
.btn-sm {
    padding: 6px 12px;
    width: auto;
}
/* 导航栏 */
.nav {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 15px 0;
    margin-bottom: 30px;
}
.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {
    font-size: 22px;
    font-weight: 700;
    color: #165DFF;
}
.nav-menu a {
    margin-left: 30px;
    font-size: 16px;
    font-weight: 500;
}
/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
.table th, .table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}
.table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #222;
}
.table tr:hover {
    background-color: #fafbfc;
}
/* 提示信息 */
.msg {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 16px;
}
.msg-success {
    background-color: #e6f7ef;
    color: #36D399;
}
.msg-error {
    background-color: #fee;
    color: #F87272;
}
/* 图片预览 */
.img-preview {
    width: 200px;
    height: auto;
    border-radius: 4px;
    margin-top: 10px;
    border: 1px solid #eee;
}
/* 后台侧边栏+主内容 */
.admin-layout {
    display: flex;
    gap: 20px;
}
.admin-sidebar {
    width: 200px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    padding: 20px 0;
}
.admin-sidebar a {
    display: block;
    padding: 12px 25px;
    font-size: 16px;
    color: #555;
}
.admin-sidebar a:hover, .admin-sidebar a.active {
    background-color: #eef5ff;
    color: #165DFF;
    font-weight: 500;
}
.admin-main {
    flex: 1;
}
/* 响应式 */
@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }
    .admin-sidebar {
        width: 100%;
        margin-bottom: 20px;
    }
    .nav-menu a {
        margin-left: 15px;
    }
}