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

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

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

.engineering-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);
}

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

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

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

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

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

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

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

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

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

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

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

/* --- tool: pixel-cm-converter --- */
.pixel-cm-tool {
    max-width: 1200px;
    margin: 0 auto;
}

.conversion-card {
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.conversion-card:hover {
    border-color: #0d6efd;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.result-display {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 10px;
    padding: 20px;
    margin: 15px 0;
    border-left: 4px solid #0d6efd;
}

.input-group-custom .form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.input-group-custom .form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.btn-convert {
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-convert:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.info-badge {
    background: linear-gradient(45deg, #0d6efd, #0dcaf0);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.preset-button {
    border-radius: 20px;
    font-size: 0.85rem;
    padding: 6px 16px;
    margin: 2px;
    transition: all 0.3s ease;
}

.preset-button:hover {
    transform: scale(1.05);
}

.history-item {
    background: white;
    border-radius: 8px;
    padding: 12px;
    margin: 8px 0;
    border-left: 3px solid #28a745;
    transition: all 0.3s ease;
}

.history-item:hover {
    background: #f8f9fa;
    transform: translateX(5px);
}

.unit-display {
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: #495057;
}

@media (max-width: 768px) {
    .conversion-card {
        margin-bottom: 20px;
    }
    
    .btn-convert {
        width: 100%;
        margin: 5px 0;
    }
}