:root {
    --primary-color: #007bff;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-gray: #f8f9fa;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

body {
    background-color: var(--light-gray);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

.platform-tabs {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 20px;
}

.platform-tabs .nav-link {
    border: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    transition: var(--transition);
    padding: 12px 20px;
}

.platform-tabs .nav-link:hover {
    background-color: rgba(0, 123, 255, 0.1);
    color: var(--primary-color);
}

.platform-tabs .nav-link.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: inset 0 -2px 0 rgba(255,255,255,0.2);
}

.account-card {
    transition: var(--transition);
    cursor: pointer;
    border-radius: var(--border-radius);
    margin-bottom: 12px;
    background: white;
}

.account-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.account-card.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
}

.platform-icon {
    font-size: 1.2em;
    margin-right: 8px;
    width: 20px;
    text-align: center;
}

.card {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: none;
    margin-bottom: 20px;
}

.card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    border: none;
}

.form-group label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 5px;
}

.form-control {
    border-radius: var(--border-radius);
    border: 2px solid #e9ecef;
    transition: var(--transition);
    padding: 10px 12px;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    padding: 10px 20px;
}

.btn-primary {
    background: linear-gradient(45deg, #007bff, #0056b3);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

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

.alert {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--box-shadow);
}

.sidebar {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 0;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.sidebar-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.credentials-form {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.password-field-container {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #6c757d;
    cursor: pointer;
    z-index: 10;
    padding: 5px;
}

.password-toggle:hover {
    color: var(--primary-color);
}

.loading-spinner {
    display: none;
    text-align: center;
    padding: 20px;
}

.required-field::after {
    content: ' *';
    color: var(--danger-color);
}

.form-text {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 5px;
}

.section-divider {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, #dee2e6, transparent);
    margin: 30px 0;
}

.action-buttons {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    border-top: 1px solid #dee2e6;
}

@media (max-width: 768px) {
    .main-container {
        padding: 10px;
    }

    .platform-tabs .nav-link {
        padding: 8px 12px;
        font-size: 0.875rem;
    }

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

/* Loading states */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    color: white;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Improved accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1050;
}