:root {
    --primary: #e61e28;
    --primary-dark: #c71a22;
    --secondary: #1a3c6c;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
    --light: #f8f9fa;
    --dark: #343a40;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    --border-radius: 8px;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    background: linear-gradient(to right, var(--primary), #b3171d);
    color: white;
    padding: 20px 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo {
    font-size: 2.5rem;
    margin-right: 15px;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

header p {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: 5px;
}

.user-info {
    text-align: right;
}

.user-info p {
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.main-nav {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
}

.main-nav ul {
    list-style: none;
    display: flex;
    padding: 0;
    margin: 0;
}

.main-nav li {
    flex: 1;
}

.main-nav a {
    display: block;
    padding: 15px;
    text-align: center;
    text-decoration: none;
    color: var(--gray);
    font-weight: 500;
    transition: var(--transition);
}

.main-nav a:hover {
    background: #f8f9fa;
}

.main-nav a.active {
    background: var(--primary);
    color: white;
}

.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-bottom: 30px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
}

.card-header i {
    font-size: 1.5rem;
    color: var(--primary);
    margin-right: 12px;
    background: #fff5f5;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.card-header h2 {
    font-size: 1.4rem;
    color: var(--dark);
    font-weight: 600;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(230, 30, 40, 0.15);
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-success {
    background: var(--success);
}

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

.btn-warning {
    background: var(--warning);
    color: var(--dark);
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-info {
    background: var(--info);
}

.btn-info:hover {
    background: #138496;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

.btn:disabled {
    background: var(--gray);
    cursor: not-allowed;
    transform: none;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.875rem;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col-md-6 {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 0 15px;
}

.col-md-12 {
    flex: 0 0 100%;
    max-width: 100%;
    padding: 0 15px;
}

.file-upload {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    border: 2px dashed #ced4da;
    border-radius: var(--border-radius);
    background-color: #fff9f9;
    cursor: pointer;
    transition: var(--transition);
    min-height: 200px;
}

.file-upload:hover {
    border-color: var(--primary);
    background-color: #ffecec;
}

.file-upload i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.file-upload p {
    margin-bottom: 15px;
    color: var(--gray);
}

.file-upload input {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.notification {
    padding: 15px;
    border-radius: var(--border-radius);
    margin: 20px 0;
    display: none;
}

.notification.success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success);
}

.notification.error {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger);
}

.notification.info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid var(--info);
}

.progress-container {
    margin: 20px 0;
    display: none;
}

.progress-bar {
    height: 20px;
    background-color: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(to right, var(--primary), #b3171d);
    border-radius: 10px;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--gray);
}

.stats-container {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.stat-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    flex: 1;
    margin: 0 10px;
    box-shadow: var(--box-shadow);
    min-width: 150px;
}

.stat-card:first-child {
    margin-left: 0;
}

.stat-card:last-child {
    margin-right: 0;
}

.stat-card .number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin: 10px 0;
}

.stat-card .label {
    color: var(--gray);
    font-size: 0.9rem;
}

.excel-example {
    background: #fff9f9;
    border: 1px solid #ffe0e0;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 20px;
}

.excel-example h3 {
    color: var(--primary);
    margin-bottom: 15px;
}

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

.excel-table th, .excel-table td {
    border: 1px solid #dee2e6;
    padding: 10px;
    text-align: center;
}

.excel-table th {
    background: #fff5f5;
}

.log-container {
    background: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 15px;
    margin-top: 20px;
    max-height: 200px;
    overflow-y: auto;
    font-family: monospace;
    font-size: 0.9rem;
}

.log-entry {
    margin-bottom: 5px;
    padding: 5px;
    border-radius: 4px;
}

.log-info {
    background: #e2f0ff;
    color: #004085;
}

.log-success {
    background: #d4edda;
    color: #155724;
}

.log-error {
    background: #f8d7da;
    color: #721c24;
}

.import-summary {
    background: #fff5f5;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 20px;
    display: none;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--light-gray);
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-label {
    font-weight: 500;
}

.summary-value {
    font-weight: 600;
    color: var(--primary);
}

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

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

th {
    background-color: #fff5f5;
    font-weight: 600;
    color: var(--primary);
    position: sticky;
    top: 0;
}

tr:hover {
    background-color: #fff9f9;
}

.search-container {
    position: relative;
    margin-bottom: 20px;
}

.search-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
}

.search-container input {
    padding-left: 45px;
}

.pagination {
    display: flex;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.pagination button {
    padding: 10px 15px;
    margin: 5px;
    background: white;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.pagination button:hover {
    background: #f8f9fa;
}

.pagination button.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.pagination button:disabled {
    background: #e9ecef;
    cursor: not-allowed;
}

.results-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px;
    background: #fff5f5;
    border-radius: var(--border-radius);
    flex-wrap: wrap;
    gap: 15px;
}

.results-info select {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
}

.filter-container {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.system-info ul {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.system-info li {
    padding: 8px 0;
    border-bottom: 1px solid var(--light-gray);
}

.system-info li:last-child {
    border-bottom: none;
}

.system-info i {
    color: var(--success);
    margin-right: 10px;
}

footer {
    text-align: center;
    padding: 20px 0;
    color: var(--gray);
    font-size: 0.9rem;
    border-top: 1px solid var(--light-gray);
    margin-top: 20px;
}

@media (max-width: 768px) {
    .col-md-6 {
        flex: 0 0 100%;
        max-width: 100%;
        margin-bottom: 20px;
    }
    
    header {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-container {
        flex-direction: column;
    }
    
    .stat-card {
        margin: 5px 0;
    }
    
    .main-nav ul {
        flex-direction: column;
    }
    
    .filter-container {
        flex-direction: column;
    }
    
    .results-info {
        flex-direction: column;
        text-align: center;
    }
}