/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: #fff;
    min-height: 100vh;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 导航样式 */
.nav {
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    padding: 0 30px;
    display: flex;
    gap: 10px;
}

.nav-item {
    padding: 15px 20px;
    text-decoration: none;
    color: #666;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

.nav-item:hover,
.nav-item.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

/* 主内容区 */
.main {
    padding: 30px;
}

.toolbar {
    margin-bottom: 20px;
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

/* 表格样式 */
.table-container {
    overflow-x: auto;
    margin-bottom: 20px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.table thead {
    background: #f8f9fa;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.table th {
    font-weight: 600;
    color: #333;
}

.table tbody tr:hover {
    background: #f8f9fa;
}

.text-center {
    text-align: center;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

/* 登录页面样式 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    color: #667eea;
    margin-bottom: 10px;
    font-size: 28px;
}

.login-box h2 {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 20px;
    font-weight: 400;
}

.login-tip {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    font-size: 12px;
    color: #999;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.form-actions {
    margin-top: 25px;
}

/* 提示信息 */
.alert {
    padding: 12px 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-error {
    background: #fee;
    color: #c33;
    border: 1px solid #fcc;
}

.alert-success {
    background: #efe;
    color: #3c3;
    border: 1px solid #cfc;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s;
}

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

.modal-content {
    background-color: #fff;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    animation: slideDown 0.3s;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    color: #333;
}

.close {
    font-size: 28px;
    font-weight: bold;
    color: #999;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: #333;
}

.modal-content form {
    padding: 20px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}