:root {

--primary-color: #3498db;   
--secondary-color: #2ecc71;  
--background-light: #f8f9fa; 
--text-light: #2d3436;      
--border-radius: 10px;       
--box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica', 'Arial', sans-serif;
    background: linear-gradient(120deg, #a1c4fd, #c2e9fb);
    color: var(--text-light);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: linear-gradient(120deg, #a1c4fd, #c2e9fb);
    padding: 0.5rem 1rem;
    box-shadow: var(--box-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo {
    height: 60px;
}

main {
    flex: 1;
    padding: 1rem;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
}


footer {
    background: linear-gradient(120deg, #a1c4fd, #c2e9fb);
    padding: 0.5rem 1rem;
    text-align: center;
    font-size: 0.8rem;
    color: #666;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.1);
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: var(--background-light);
    font-weight: bold;
}

.alert {
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

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

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

.invalid-feedback {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.d-block {
    display: block;
}

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

@media (max-width: 768px) {
    body {
        font-size: 14px;
    }

    main {
        padding: 0.5rem;
    }

    .card {
        padding: 1rem;
    }

    .btn {
        padding: 0.5rem 1rem;
    }
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.header-logo {
    height: 60px;
    flex-shrink: 0;
}

.header-title {
    flex-grow: 1;
    text-align: center;
    margin: 0;
}

.center-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 70vh;
    padding: 2rem 1rem;
}

.center-content {
    width: 100%;
    max-width: 400px;
}

.form-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    width: 100%;
}
/* 在 style.css 文件末尾添加 */
.submit-container {
    text-align: center;
    margin-top: 1.5rem;
}

.submit-container .btn {
    display: inline-block;
    min-width: 120px;
}


/* 公告弹窗样式 */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: #fefefe;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 1rem;
    border-bottom: 1px solid #ddd;
    background-color: var(--background-light);
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
}

.modal-body {
    padding: 1.5rem;
    flex-grow: 1;
}

.modal-footer {
    padding: 1rem;
    border-top: 1px solid #ddd;
    text-align: right;
}

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
}
.mr-2 {
    margin-right: 0.5rem;
}

.mt-4 {
    margin-top: 1.5rem;
}


.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.footer-link {
    color: #666;
    text-decoration: none;
}

.footer-link:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 0.5rem;
    }
}
/* 页脚链接样式 */
.footer-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-separator {
    color: #666;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .footer-links {
        gap: 0.25rem;
    }
}
/* Tab 容器 */
.tab-container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.tab-nav {
    display: flex;
    border-bottom: 1px solid #ddd;
    margin-bottom: 1rem;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: bold;
    color: #6c757d;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-pane.active {
    display: block;
}
/* 简约按钮样式 */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background-color: var(--primary-color); /* 使用纯色背景 */
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
}