.tool-fullwidth {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Tool shell */
.query-tool {
    max-width: 100%;
    margin: 0 auto;
}

.query-tool.editor-section,
.editor-section.query-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.query-tool .card:not(.result-card) {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.query-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.query-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.query-tool .form-control,
.query-tool .form-select,
.query-tool .select-input,
.query-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.query-tool .form-control:focus,
.query-tool .form-select:focus,
.query-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.query-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.query-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.query-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .query-tool .card:not(.result-card) {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .query-tool .card-title,
[data-theme="dark"] .query-tool .form-label,
[data-theme="dark"] .query-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .query-tool .text-muted,
[data-theme="dark"] .query-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .query-tool .form-control,
[data-theme="dark"] .query-tool .form-select,
[data-theme="dark"] .query-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: ip-subnet-calculator --- */
.ip-calculator {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.ip-input-group {
    position: relative;
}

.ip-input-group .form-control {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    letter-spacing: 0.5px;
}

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

.result-card .card-body {
    padding: 1.5rem;
}

.ip-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.ip-info-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.ip-info-label {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

.ip-info-value {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    font-weight: bold;
    word-break: break-all;
}

.binary-display {
    font-family: 'Courier New', monospace;
    font-size: 12px;
    background: rgba(0, 0, 0, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
    word-break: break-all;
    line-height: 1.4;
}

.network-class {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.class-a { background: #28a745; color: white; }
.class-b { background: #007bff; color: white; }
.class-c { background: #ffc107; color: black; }
.class-d { background: #dc3545; color: white; }
.class-e { background: #6c757d; color: white; }

.subnet-mask-visual {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.mask-bit {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: bold;
}

.mask-bit.network { background: #28a745; color: white; }
.mask-bit.host { background: #6c757d; color: white; }

.tab-content {
    border: 1px solid #dee2e6;
    border-top: none;
    padding: 1.5rem;
    background: white;
}

.nav-tabs .nav-link {
    border-radius: 0;
}

.nav-tabs .nav-link.active {
    background: #007bff;
    color: white;
    border-color: #007bff;
}

.error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.success-message {
    color: #28a745;
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

@media (max-width: 768px) {
    .ip-info-grid {
        grid-template-columns: 1fr;
    }
    
    .subnet-mask-visual {
        flex-wrap: wrap;
    }
}