body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.8rem;
    font-weight: 700;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: #666 !important;
    margin: 0 0.5rem;
    padding: 0.5rem 0.75rem !important;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.navbar-nav .nav-link:hover {
    background-color: #f0f0f0;
    color: #667eea !important;
}

.navbar-nav .nav-link.active {
    color: #667eea !important;
    background-color: #f0f0f0;
    font-weight: 600;
}

.card {
    border: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 1rem;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: #ffffff;
    color: #1f2a44;
    border: none;
    border-bottom: 1px solid #e9edf7;
    border-radius: 12px 12px 0 0;
    font-weight: 700;
    letter-spacing: 0.01em;
    padding: 1rem 1.25rem;
}

.card-header h5 {
    font-size: 1.1rem;
    margin: 0;
}

.card-body {
    padding: 1.25rem;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary {
    background: #667eea;
    border: none;
    color: #fff;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-success {
    background: #48bb78;
    border: none;
}

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

.btn-outline-danger {
    color: #e53e3e;
    border-color: #e53e3e;
}

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

.btn-sm {
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
}

.form-control,
.form-select {
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-label {
    font-weight: 600;
    color: #1f2a44;
    margin-bottom: 0.5rem;
}

input[type="text"],
input[type="number"],
input[type="password"] {
    background: #fafbfc;
}

#authStatus {
    font-size: 0.95rem;
    color: #666;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#authStatus strong {
    color: #1f2a44;
}

#authStatus .text-muted {
    color: #a0aec0 !important;
}

#authStatus .text-danger {
    color: #e53e3e !important;
}

#tokenUrlPreview {
    background: #f0f4ff;
    padding: 0.75rem;
    border: 1px solid #cbd5e0;
    border-radius: 6px;
    word-break: break-all;
    margin-top: 0.5rem;
}

.output {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    max-height: 300px;
    overflow-y: auto;
    font-size: 0.85rem;
    font-family: "Courier New", monospace;
    padding: 0.75rem;
    color: #1f2a44;
    line-height: 1.4;
}

.list-group {
    border: none;
}

.list-group-item {
    border: 1px solid #e9edf7;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background: #fff;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    color: #1f2a44;
}

.list-group-item:hover {
    background: #f8f9fa;
    border-color: #667eea;
}

.list-group-item.list-group-item-danger {
    background: #fed7d7;
    border-color: #fc8181;
    color: #742a2a;
}

.alert {
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
}

.alert-info {
    background: #bee3f8;
    color: #2c5282;
    border: 1px solid #90cdf4;
}

.alert-danger {
    background: #fed7d7;
    color: #742a2a;
    border: 1px solid #fc8181;
}

.alert-success {
    background: #c6f6d5;
    color: #22543d;
    border: 1px solid #9ae6b4;
}

table {
    font-size: 0.95rem;
}

table thead {
    background: #f7fafc;
    font-weight: 600;
    color: #1f2a44;
}

table tbody tr {
    transition: background-color 0.2s ease;
}

table tbody tr:hover {
    background-color: #f7fafc;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 1rem 0;
    }

    .container {
        padding: 0 1rem;
    }

    .navbar-brand {
        font-size: 1.4rem;
    }

    .navbar-nav .nav-link {
        margin: 0.25rem 0;
        padding: 0.5rem 0.5rem !important;
        font-size: 0.9rem;
    }

    .card {
        margin-bottom: 1rem;
    }

    .card-body {
        padding: 1rem;
    }

    .card-header {
        padding: 0.75rem 1rem;
    }

    .card-header h5 {
        font-size: 1rem;
    }

    .row.g-3 > .col-md {
        margin-bottom: 1rem;
    }

    .input-group {
        flex-wrap: wrap;
    }

    .input-group input,
    .input-group select,
    .input-group button {
        flex: 1 1 100%;
        min-width: 100%;
    }

    .input-group button {
        margin-top: 0.5rem;
    }

    .form-label {
        font-size: 0.9rem;
    }

    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    table {
        font-size: 0.85rem;
    }

    #authStatus {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .output {
        max-height: 200px;
        font-size: 0.8rem;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.2rem;
    }

    .container {
        padding: 0 0.75rem;
    }

    .row.g-4 {
        --bs-gutter-x: 0.75rem;
        --bs-gutter-y: 0.75rem;
    }

    .card-body {
        padding: 0.75rem;
    }

    .card-header {
        padding: 0.6rem 0.75rem;
    }

    .btn-sm {
        font-size: 0.8rem;
        padding: 0.35rem 0.6rem;
    }

    .form-control,
    .form-select {
        font-size: 0.9rem;
        padding: 0.5rem;
    }

    .list-group-item {
        padding: 0.6rem 0.75rem;
        font-size: 0.85rem;
        margin-bottom: 0.4rem;
    }

    .output {
        max-height: 150px;
        font-size: 0.75rem;
        padding: 0.5rem;
    }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #4c51bf 0%, #5a367a 100%);
        color: #e9ecef;
    }

    .card {
        background: #2d3748;
        color: #e9ecef;
        border-color: #4a5568;
    }

    .card-header {
        background: #1a202c !important;
        color: #e9ecef;
        border-color: #4a5568;
    }

    .card-body {
        background: #2d3748;
        color: #e9ecef;
    }

    .list-group-item {
        background: #2d3748;
        color: #e2e8f0;
        border-color: #4a5568;
    }

    .list-group-item:hover {
        background: #4a5568;
    }

    .output {
        background: #2d3748;
        color: #e2e8f0;
        border-color: #4a5568;
    }

    .form-control,
    .form-select {
        background: #374151;
        color: #e9ecef;
        border-color: #4a5568;
    }

    .form-control:focus,
    .form-select:focus {
        background: #374151;
        border-color: #60a5fa;
        color: #e9ecef;
    }

    .form-control::placeholder {
        color: #9ca3af;
    }

    .form-label {
        color: #e9ecef;
    }

    .navbar,
    .navbar-dark {
        background: #1a202c !important;
    }

    .navbar-nav .nav-link {
        color: #a0aec0 !important;
    }

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
        color: #667eea !important;
        background-color: #2d3748;
    }

    .text-muted {
        color: #9ca3af !important;
    }

    #authStatus {
        color: #a0aec0;
    }

    #authStatus strong {
        color: #e2e8f0;
    }

    table {
        color: #e9ecef;
    }

    table thead {
        background: #1a202c;
        color: #cbd5e0;
    }

    table tbody tr:hover {
        background-color: #374151;
    }

    code {
        background-color: #374151;
        color: #60a5fa;
        padding: 2px 6px;
        border-radius: 3px;
    }
}