/* styles.css */

/* 全局设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    background-color: #f0f0f0;
}

/* 页头 */
header {
    background-color: #003366;
    color: #fff;
    padding: 10px 20px;
}
.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo h1 {
    font-size: 1.5em;
    margin: 0;
}
.nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}
.nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
}
.nav ul li a:hover {
    text-decoration: underline;
}

/* 主体内容 */
main {
    max-width: 900px;
    margin: 20px auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 6px;
}

/* 页脚 */
footer {
    max-width: 1200px;
    margin: 20px auto;
    text-align: center;
    color: #666;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #0066cc;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
}
.btn:hover {
    background-color: #004999;
}

/* 表单样式 */
.form-group {
    margin-bottom: 15px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}
.error {
    color: red;
    margin: 10px 0;
}
/* 加载动画样式 */
#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #ccc;
    border-top-color: #003366;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
/* 仪表盘整体容器 */
.dashboard-container {
    max-width: 1100px;
    margin: 20px auto;
    padding: 20px;
}

/* 卡片样式 */
.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 30px;
}

/* 仪表盘标题 */
.card h2 {
    margin-top: 0;
    color: #003366;
}

/* 表格样式 */
.dashboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.dashboard-table th,
.dashboard-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
}

.dashboard-table th {
    background: linear-gradient(90deg, #0066cc, #004999);
    color: #fff;
}

.dashboard-table tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

.action-link {
    color: #0066cc;
    text-decoration: none;
}

.action-link:hover {
    text-decoration: underline;
}

/* 学生列表样式 */
.student-list {
    list-style: none;
    padding: 0;
}

.student-list li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.student-list li:last-child {
    border-bottom: none;
}
/* ========== 通用样式 ========== */
html, body {
    margin: 0;
    padding: 0;
    font-family: "Helvetica Neue", Arial, sans-serif;
    color: #333;
    background: linear-gradient(to bottom right, #f2f5f8, #e6ebef);
    min-height: 100vh;
}

/* 如果已有 header/footer 样式可保留，这里仅示例 */
header {
    background-color: #003366;
    color: #fff;
    padding: 10px 20px;
}

/* 主体容器 */
.dashboard-container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
}

/* ========== 卡片样式 ========== */
.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    overflow: hidden;
}

/* 卡片头部 */
.card-header {
    background: #0066cc;
    color: #fff;
    padding: 15px 20px;
}
.card-header h2 {
    margin: 0;
    font-size: 1.4em;
}

/* 卡片主体 */
.card-body {
    padding: 20px;
}

/* ========== 表格样式 ========== */
.dashboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background-color: #fff;
}

.dashboard-table thead tr {
    background-color: #f0f3f6;
}
.dashboard-table th,
.dashboard-table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: center;
    font-size: 14px;
}
.dashboard-table th {
    font-weight: 600;
    color: #333;
}
.dashboard-table tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}
.no-records {
    font-style: italic;
    margin-top: 15px;
    color: #666;
}

/* 学生列表 */
.student-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.student-list li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}
.student-list li:last-child {
    border-bottom: none;
}

/* ========== 操作链接样式 ========== */
.action-link {
    color: #0066cc;
    text-decoration: none;
    font-weight: 500;
}
.action-link:hover {
    text-decoration: underline;
}

/* ========== 加载动画样式（可选） ========== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.7);
    z-index: 999;
    display: flex;
    justify-content: center;
    align-items: center;
}
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #ccc;
    border-top-color: #0066cc;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
/* 容器：与仪表盘保持一致 */
.dashboard-container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
}

/* 卡片 */
.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    overflow: hidden;
}

.card-header {
    background: #0066cc;
    color: #fff;
    padding: 15px 20px;
}
.card-header h2 {
    margin: 0;
    font-size: 1.4em;
}
.card-body {
    padding: 20px;
}

/* 提示信息 */
.info-message {
    background-color: #f0f9ff;
    border-left: 5px solid #66c0f4;
    padding: 10px 15px;
    margin-bottom: 15px;
    color: #333;
    border-radius: 4px;
}

/* 表单容器 */
.form-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 表单分组 */
.form-group label {
    font-weight: 600;
    margin-bottom: 5px;
    display: inline-block;
}
.form-group input[type="text"],
.form-group textarea {
    width: 100%;
    padding: 8px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

/* 按钮 */
.btn {
    display: inline-block;
    background: #0066cc;
    color: #fff;
    padding: 10px 20px;
    font-size: 14px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}
.btn:hover {
    background: #004999;
}
/* 主要容器 */
.dashboard-container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
}

/* 卡片布局 */
.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    overflow: hidden;
}

.card-header {
    background: #0066cc;
    color: #fff;
    padding: 15px 20px;
}
.card-header h2 {
    margin: 0;
    font-size: 1.4em;
}
.card-body {
    padding: 20px;
}

/* 提示信息样式 */
.info-message {
    background-color: #f0f9ff;
    border-left: 5px solid #66c0f4;
    padding: 10px 15px;
    margin-bottom: 15px;
    color: #333;
    border-radius: 4px;
}

/* 表单容器 */
.form-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 5px;
    display: inline-block;
}

.form-group select {
    width: 100%;
    padding: 8px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

/* 按钮 */
.btn {
    display: inline-block;
    background: #0066cc;
    color: #fff;
    padding: 10px 20px;
    font-size: 14px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}
.btn:hover {
    background: #004999;
}

/* 链接 */
.action-link {
    color: #0066cc;
    text-decoration: none;
    font-weight: 500;
}
.action-link:hover {
    text-decoration: underline;
}