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

:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #48bb78;
    --danger: #f56565;
    --warning: #ed8936;
    --info: #4299e1;
    --light: #f7fafc;
    --dark: #2d3748;
    --gray: #a0aec0;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: white;
    border-radius: 15px;
    padding: 20px 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.header h1 {
    color: var(--primary);
    font-size: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.header h1::before {
    content: "📊";
    font-size: 32px;
}

/* Navigation */
.nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.nav-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s ease;
}

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

.nav-btn.active {
    background: var(--secondary);
}

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

.stat-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card h3 {
    color: var(--gray);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary);
}

.stat-card.success .stat-value {
    color: var(--success);
}

.stat-card.info .stat-value {
    color: var(--info);
}

.stat-card.warning .stat-value {
    color: var(--warning);
}

/* Card */
.card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border);
}

.card-header h2 {
    color: var(--dark);
    font-size: 22px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark);
    font-weight: 600;
    font-size: 14px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

/* Button */
.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

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

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

.btn-success:hover {
    background: #38a169;
}

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

.btn-danger:hover {
    background: #e53e3e;
}

.btn-sm {
    padding: 8px 15px;
    font-size: 13px;
}

/* Table */
.table-container {
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

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

thead {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
}

td {
    padding: 15px;
    border-bottom: 1px solid var(--border);
}

tbody tr {
    transition: background 0.2s ease;
}

tbody tr:hover {
    background: var(--light);
}

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

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

/* Badge */
.badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: #c6f6d5;
    color: #22543d;
}

.badge-danger {
    background: #fed7d7;
    color: #742a2a;
}

.badge-warning {
    background: #feebc8;
    color: #7c2d12;
}

.badge-info {
    background: #bee3f8;
    color: #2c5282;
}

/* Alert */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: #c6f6d5;
    color: #22543d;
    border: 2px solid #9ae6b4;
}

.alert-danger {
    background: #fed7d7;
    color: #742a2a;
    border: 2px solid #fc8181;
}

.alert-info {
    background: #bee3f8;
    color: #2c5282;
    border: 2px solid #90cdf4;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.empty-state p {
    font-size: 15px;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--gray);
}

.spinner {
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    border-radius: 15px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header {
        padding: 15px 20px;
    }
    
    .header h1 {
        font-size: 22px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: 20px;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        font-size: 14px;
    }
    
    th, td {
        padding: 10px;
    }
    
    .nav {
        width: 100%;
    }
    
    .nav-btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 18px;
    }
    
    .stat-value {
        font-size: 24px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .modal-content {
        padding: 20px;
    }
}