:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --success: #48bb78;
    --warning: #ed8936;
    --danger: #f56565;
    --info: #4299e1;
    --dark: #2d3748;
    --light: #f7fafc;
    --gray: #a0aec0;
    --gray-light: #e2e8f0;
    --border-radius: 15px;
    --box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: white;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    box-shadow: var(--box-shadow);
    z-index: 1000;
    overflow-y: auto;
    transition: var(--transition);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--gray-light);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.sidebar-header h2 {
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

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

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    border-left: 4px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: linear-gradient(90deg, rgba(102, 126, 234, 0.1) 0%, transparent 100%);
    color: var(--primary);
    border-left: 4px solid var(--primary);
}

.sidebar-nav i {
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    margin-left: 260px;
    padding: 24px;
    transition: var(--transition);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--gray-light);
    background: white;
    padding: 20px 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.header h1 {
    font-size: 28px;
    color: var(--dark);
    font-weight: 700;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-bottom: 25px;
    transition: var(--transition);
    border: 1px solid var(--gray-light);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.12);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--gray-light);
}

.card-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-light);
}

.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.table th {
    background: linear-gradient(135deg, #f5f7fa, #e2e8f0);
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid var(--gray-light);
}

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

.table tbody tr:hover {
    background: rgba(102, 126, 234, 0.05);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(72, 187, 120, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(237, 137, 54, 0.1);
    color: var(--warning);
}

.badge-danger {
    background: rgba(245, 101, 101, 0.1);
    color: var(--danger);
}

.badge-info {
    background: rgba(66, 153, 225, 0.1);
    color: var(--info);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    text-decoration: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-icon {
    padding: 8px;
    width: 36px;
    height: 36px;
    justify-content: center;
}

/* Forms */
.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 16px;
    border: 2px solid var(--gray-light);
    border-radius: 8px;
    font-size: 16px;
    transition: var(--transition);
    background: white;
}

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

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

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

.stat-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--gray-light);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.stat-card h4 {
    font-size: 14px;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 5px;
}

.stat-card .change {
    font-size: 14px;
    color: var(--success);
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background: rgba(72, 187, 120, 0.1);
    border-color: var(--success);
    color: #276749;
}

.alert-danger {
    background: rgba(245, 101, 101, 0.1);
    border-color: var(--danger);
    color: #c53030;
}

.alert-warning {
    background: rgba(237, 137, 54, 0.1);
    border-color: var(--warning);
    color: #c05621;
}

.alert-info {
    background: rgba(66, 153, 225, 0.1);
    border-color: var(--info);
    color: #2c5282;
}

/* Pagination */
.pagination {
    display: flex;
    list-style: none;
    gap: 5px;
    justify-content: center;
    margin-top: 20px;
}

.page-item {
    margin: 0 2px;
}

.page-link {
    padding: 8px 12px;
    border: 1px solid var(--gray-light);
    border-radius: 6px;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
    background: white;
}

.page-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-item.active .page-link {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Filter Form */
.filter-form {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border: 1px solid var(--gray-light);
}

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

/* API Key Display */
.api-key-display {
    background: var(--dark);
    color: white;
    padding: 15px;
    border-radius: 8px;
    font-family: monospace;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--gray-light);
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray);
}

.modal-close:hover {
    color: var(--danger);
}

/* Loader */
.loader {
    border: 3px solid var(--gray-light);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    
    .sidebar-header h2 span,
    .sidebar-nav a span {
        display: none;
    }
    
    .main-content {
        margin-left: 70px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .filter-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .main-content {
        padding: 15px;
    }
    
    .card {
        padding: 15px;
    }
    
    .table th,
    .table td {
        padding: 10px;
    }
}