* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    background-color: #f5f7fa;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    padding: 30px;
    margin-bottom: 20px;
}

h1, h2 {
    color: #333;
    margin-bottom: 20px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #666;
    font-weight: 500;
}

input[type="file"],
input[type="text"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e1e4e8;
    border-radius: 4px;
    font-size: 14px;
    color: #333;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #0056b3;
}

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

.btn-danger:hover {
    background-color: #c82333;
}

.btn-success {
    background-color: #28a745;
}

.btn-success:hover {
    background-color: #218838;
}

.link-display {
    margin-top: 20px;
    padding: 15px;
    background-color: #e9f5ff;
    border-radius: 4px;
    word-break: break-all;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.table th, .table td {
    padding: 12px 15px;
    border: 1px solid #e1e4e8;
    text-align: left;
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 10px;
}

.login-form {
    max-width: 400px;
    margin: 0 auto;
}

.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
    font-size: 14px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.hidden {
    display: none;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.logout-btn {
    color: #dc3545;
    text-decoration: none;
    font-weight: 500;
}

.logout-btn:hover {
    text-decoration: underline;
}

/* 后台管理页面专属美化 - 限制排列宽度（本次新增完整样式） */
.admin-container {
    max-width: 1200px; /* 限制后台最大宽度，避免过宽变形 */
    margin: 0 auto;
    padding: 0 20px;
}

.admin-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    padding: 30px;
    margin-bottom: 20px;
    overflow: hidden;
}

/* 优化表格样式 */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.admin-table th, .admin-table td {
    padding: 14px 18px;
    border: 1px solid #f0f0f0;
    text-align: left;
    white-space: nowrap;
}

.admin-table th {
    background-color: #f8fafc;
    font-weight: 600;
    color: #2d3748;
    border-bottom: 2px solid #e2e8f0;
}

.admin-table tr:hover {
    background-color: #fafbfc;
    transition: background-color 0.2s;
}

/* 优化弹窗样式 - 限制宽度，美化布局 */
.admin-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 680px; /* 限制弹窗宽度 */
    max-width: 90vw; /* 适配移动端 */
    z-index: 100;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 30px rgba(0,0,0,0.15);
    padding: 30px;
}

/* 优化操作按钮样式 */
.admin-btn {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
}

.admin-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.admin-btn-danger {
    background-color: #dc3545;
    color: #fff;
    border: none;
    border-radius: 8px;
}

.admin-btn-success {
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 8px;
}

/* 优化头部布局 */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid #f0f0f0;
}

.admin-header h2 {
    margin: 0;
    color: #2d3748;
    font-size: 22px;
}

/* 优化提示框样式 */
.admin-alert {
    padding: 16px;
    margin-bottom: 20px;
    border-radius: 8px;
    font-size: 14px;
}