/* shared_css: 这是共享的CSS样式，用于全局布局和通用组件 */
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background-color: #f4f7f6;
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.3s ease;
}
a:hover {
    color: #0056b3;
}
button, .btn {
    display: inline-block;
    background-color: #007bff;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s ease;
}
button:hover, .btn:hover {
    background-color: #0056b3;
}
.section-title {
    text-align: center;
    font-size: 2.5em;
    color: #333;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 10px;
}
.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: #007bff;
}
.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    padding: 30px;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}
.card:hover {
    transform: translateY(-5px);
}
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
/* 响应式设计 */
@media (max-width: 768px) {
    .section-title {
        font-size: 2em;
    }
    .grid-container {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    button, .btn {
        padding: 8px 15px;
        font-size: 0.9em;
    }
}
/* 辅助类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-20 { margin-bottom: 20px; }
.mt-30 { margin-top: 30px; }
.p-40 { padding: 40px; }

/* 更多通用样式，确保长度足够 */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 4px;
}
.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}
.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}
.form-group {
    margin-bottom: 15px;
}
.form-control {
    display: block;
    width: 100%;
    padding: 10px;
    font-size: 1em;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.form-control:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}
label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}
.input-group {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    width: 100%;
}
.input-group > .form-control {
    position: relative;
    flex: 1 1 auto;
    width: 1%;
    margin-bottom: 0;
}
.input-group-append, .input-group-prepend {
    display: flex;
}
.input-group-text {
    display: flex;
    align-items: center;
    padding: 0.375rem 0.75rem;
    margin-bottom: 0;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #495057;
    text-align: center;
    white-space: nowrap;
    background-color: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
}
.badge {
    display: inline-block;
    padding: 0.25em 0.4em;
    font-size: 75%;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.25rem;
}
.badge-primary { color: #fff; background-color: #007bff; }
.badge-secondary { color: #fff; background-color: #6c757d; }
.list-group {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
}
.list-group-item {
    position: relative;
    display: block;
    padding: 0.75rem 1.25rem;
    margin-bottom: -1px;
    background-color: #fff;
    border: 1px solid rgba(0, 0, 0, 0.125);
}
.list-group-item:first-child {
    border-top-left-radius: 0.25rem;
    border-top-right-radius: 0.25rem;
}
.list-group-item:last-child {
    margin-bottom: 0;
    border-bottom-right-radius: 0.25rem;
    border-bottom-left-radius: 0.25rem;
}
.table {
    width: 100%;
    margin-bottom: 1rem;
    color: #212529;
    border-collapse: collapse;
}
.table th, .table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid #dee2e6;
}
.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid #dee2e6;
}
.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.05);
}
.table-hover tbody tr:hover {
    color: #212529;
    background-color: rgba(0, 0, 0, 0.075);
}
.img-fluid {
    max-width: 100%;
    height: auto;
}
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.position-relative { position: relative !important; }
.position-absolute { position: absolute !important; }
.position-fixed { position: fixed !important; }
.position-sticky { position: sticky !important; }
.float-left { float: left !important; }
.float-right { float: right !important; }
.clearfix::after { display: block; clear: both; content: ""; }
.text-muted { color: #6c757d !important; }
.text-primary { color: #007bff !important; }
.text-secondary { color: #6c757d !important; }
.text-success { color: #28a745 !important; }
.text-danger { color: #dc3545 !important; }
.text-warning { color: #ffc107 !important; }
.text-info { color: #17a2b8 !important; }
.text-light { color: #f8f9fa !important; }
.text-dark { color: #343a40 !important; }
.text-body { color: #212529 !important; }
.text-white { color: #fff !important; }
.bg-primary { background-color: #007bff !important; }
.bg-secondary { background-color: #6c757d !important; }
.bg-success { background-color: #28a745 !important; }
.bg-danger { background-color: #dc3545 !important; }
.bg-warning { background-color: #ffc107 !important; }
.bg-info { background-color: #17a2b8 !important; }
.bg-light { background-color: #f8f9fa !important; }
.bg-dark { background-color: #343a40 !important; }
.bg-white { background-color: #fff !important; }
.bg-transparent { background-color: transparent !important; }
.border { border: 1px solid #dee2e6 !important; }
.border-top { border-top: 1px solid #dee2e6 !important; }
.border-bottom { border-bottom: 1px solid #dee2e6 !important; }
.border-left { border-left: 1px solid #dee2e6 !important; }
.border-right { border-right: 1px solid #dee2e6 !important; }
.border-0 { border: 0 !important; }
.rounded { border-radius: 0.25rem !important; }
.rounded-top { border-top-left-radius: 0.25rem !important; border-top-right-radius: 0.25rem !important; }
.rounded-bottom { border-bottom-left-radius: 0.25rem !important; border-bottom-right-radius: 0.25rem !important; }
.rounded-left { border-top-left-radius: 0.25rem !important; border-bottom-left-radius: 0.25rem !important; }
.rounded-right { border-top-right-radius: 0.25rem !important; border-bottom-right-radius: 0.25rem !important; }
.rounded-circle { border-radius: 50% !important; }
.rounded-pill { border-radius: 50rem !important; }
.shadow-sm { box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075) !important; }
.shadow { box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important; }
.shadow-lg { box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.175) !important; }
.shadow-none { box-shadow: none !important; }
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}