* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

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

.login-box {
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    font-size: 24px;
    color: #667eea;
    margin-bottom: 10px;
    text-align: center;
}

.login-box h2 {
    font-size: 18px;
    color: #666;
    margin-bottom: 30px;
    text-align: center;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 14px;
}

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

.btn-primary {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
}

.btn-primary:hover {
    background: #764ba2;
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.error-message {
    margin-top: 15px;
    padding: 10px;
    background: #fff2f0;
    border: 1px solid #ffccc7;
    border-radius: 4px;
    color: #ff4d4f;
    font-size: 14px;
    text-align: center;
}

.success-message {
    margin-top: 15px;
    padding: 10px;
    background: #f6ffed;
    border: 1px solid #b7eb8f;
    border-radius: 4px;
    color: #52c41a;
    font-size: 14px;
    text-align: center;
}

.hidden {
    display: none;
}

.footer-links {
    margin-top: 20px;
    text-align: center;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    font-size: 14px;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Dashboard Layout */
.dashboard {
    min-height: 100vh;
    display: flex;
}

.sidebar {
    width: 250px;
    background: #001529;
    color: #fff;
    padding: 20px 0;
}

.sidebar-header {
    padding: 0 20px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h1 {
    font-size: 18px;
    margin-bottom: 5px;
}

.sidebar-header p {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
}

.sidebar-menu {
    list-style: none;
    padding: 20px 0;
}

.sidebar-menu li {
    margin-bottom: 5px;
}

.sidebar-menu a {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.logout-btn {
    margin: 20px;
    padding: 10px;
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 4px;
    cursor: pointer;
    width: calc(100% - 40px);
}

.logout-btn:hover {
    background: rgba(255,255,255,0.2);
}

.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.page-header {
    margin-bottom: 30px;
}

.page-header h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

.page-header p {
    color: #999;
    font-size: 14px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.stat-card h3 {
    font-size: 14px;
    color: #999;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 32px;
    font-weight: bold;
    color: #333;
}

/* Table */
.table-container {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.table-header {
    padding: 20px;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header h3 {
    font-size: 18px;
}

.btn {
    padding: 8px 16px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    font-size: 14px;
}

.btn:hover {
    border-color: #667eea;
    color: #667eea;
}

.btn-success {
    background: #52c41a;
    color: #fff;
    border-color: #52c41a;
}

.btn-success:hover {
    background: #73d13d;
}

.btn-danger {
    background: #ff4d4f;
    color: #fff;
    border-color: #ff4d4f;
}

.btn-danger:hover {
    background: #ff7875;
}

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

thead {
    background: #fafafa;
}

th, td {
    padding: 12px 20px;
    text-align: left;
    font-size: 14px;
}

th {
    font-weight: 600;
    color: #666;
}

tbody tr {
    border-bottom: 1px solid #f0f0f0;
}

tbody tr:hover {
    background: #fafafa;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 12px;
}

.badge-success {
    background: #f6ffed;
    color: #52c41a;
    border: 1px solid #b7eb8f;
}

.badge-default {
    background: #f0f0f0;
    color: #999;
}

.action-buttons {
    display: flex;
    gap: 5px;
}

.action-buttons button {
    padding: 4px 8px;
    font-size: 12px;
    white-space: nowrap;
    min-width: 50px;
}

.action-buttons button:disabled {
    background: #f5f5f5 !important;
    color: #333 !important;
    border-color: #d9d9d9 !important;
    cursor: not-allowed !important;
    opacity: 1 !important;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: #fff;
    border-radius: 8px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #999;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid #f0f0f0;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Form in Modal */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-grid .form-group.full-width {
    grid-column: 1 / -1;
}

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

.form-group small {
    display: block;
    margin-top: 5px;
    color: #999;
    font-size: 12px;
}

/* Loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}