:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --warning-color: #ea580c;
    --info-color: #0891b2;
    --light-gray: #f3f4f6;
    --medium-gray: #9ca3af;
    --dark-gray: #374151;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px 0;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.header-nav {
    display: flex;
    gap: 15px;
}

.header-nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 5px;
    transition: background 0.3s;
}

.header-nav a:hover,
.header-nav a.active {
    background: rgba(255, 255, 255, 0.2);
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 25px;
    margin-bottom: 20px;
}

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

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-gray);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-success:hover:not(:disabled) {
    background: #15803d;
}

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

.btn-danger:hover:not(:disabled) {
    background: #b91c1c;
}

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

.btn-warning:hover:not(:disabled) {
    background: #c2410c;
}

.btn-secondary {
    background: var(--medium-gray);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--dark-gray);
}

.btn-sm {
    padding: 5px 12px;
    font-size: 0.85rem;
}

.btn-icon {
    padding: 8px 12px;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-info {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-secondary {
    background-color: #e5e7eb;
    color: #374151;
}

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

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--dark-gray);
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.95rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control:disabled {
    background-color: var(--light-gray);
    cursor: not-allowed;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

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

.table thead {
    background: var(--light-gray);
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    color: var(--dark-gray);
}

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

.table-actions {
    display: flex;
    gap: 5px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    overflow-y: auto;
    align-items: center;
    justify-content: center;
    padding: 20px;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px 12px 0 0;
}

.modal-header h2,
.modal-header h3 {
    margin: 0;
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-close,
.close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: white;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
    line-height: 1;
}

.modal-close:hover,
.close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 15px 25px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background: #fed7aa;
    color: #92400e;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background: #cffafe;
    color: #164e63;
    border-left: 4px solid var(--info-color);
}

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

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.primary {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.stat-icon.success {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success-color);
}

.stat-icon.warning {
    background: rgba(234, 88, 12, 0.1);
    color: var(--warning-color);
}

.stat-icon.info {
    background: rgba(8, 145, 178, 0.1);
    color: var(--info-color);
}

.stat-info h3 {
    font-size: 0.9rem;
    color: var(--medium-gray);
    font-weight: 500;
}

.stat-info p {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark-gray);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-primary {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.badge-success {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success-color);
}

.badge-danger {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger-color);
}

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

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

.gap-10 {
    gap: 10px;
}

.hidden {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .header-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .modal-content {
        width: 95%;
        margin: 10px;
    }
    
    .table-responsive {
        overflow-x: scroll;
    }
}