.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: paint-calculator --- */
/* 油漆用量计算器样式 */
.paint-calculator-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    min-height: auto;
}

.paint-calculator-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    padding: 30px;
    margin-bottom: 20px;
}

.calculator-title {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
    font-weight: 600;
    font-size: 2rem;
}

.input-group-custom {
    margin-bottom: 25px;
}

.input-group-custom label {
    display: block;
    margin-bottom: 8px;
    color: #495057;
    font-weight: 500;
    font-size: 0.95rem;
}

.input-container {
    position: relative;
    display: flex;
    align-items: center;
    background: white;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.input-container:focus-within {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
}

.input-container input {
    flex: 1;
    border: none;
    padding: 12px 15px;
    font-size: 1rem;
    background: transparent;
    outline: none;
}

.unit-text {
    padding: 0 15px;
    color: #6c757d;
    font-size: 0.9rem;
    background: #f8f9fa;
    border-left: 1px solid #e9ecef;
}

.btn-controls {
    display: flex;
    flex-direction: column;
    background: #f8f9fa;
    border-left: 1px solid #e9ecef;
}

.btn-controls button {
    background: none;
    border: none;
    padding: 8px 12px;
    color: #6c757d;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.1rem;
    font-weight: bold;
}

.btn-controls button:hover {
    background: #e9ecef;
    color: #495057;
}

.btn-controls button:active {
    background: #dee2e6;
}

.select-group-custom {
    margin-bottom: 25px;
}

.select-group-custom label {
    display: block;
    margin-bottom: 8px;
    color: #495057;
    font-weight: 500;
    font-size: 0.95rem;
}

.select-group-custom select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    background: white;
    font-size: 1rem;
    color: #495057;
    cursor: pointer;
    transition: all 0.3s ease;
}

.select-group-custom select:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
    outline: none;
}

.dimension-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 25px;
}

.calculate-btn, .reset-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 15px;
}

.calculate-btn {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
}

.calculate-btn:hover {
    background: linear-gradient(135deg, #0056b3, #004085);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,123,255,0.3);
}

.reset-btn {
    background: #6c757d;
    color: white;
}

.reset-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.result-section {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 25px;
    margin-top: 25px;
    border-left: 4px solid #007bff;
}

.result-title {
    color: #2c3e50;
    margin-bottom: 20px;
    font-weight: 600;
    text-align: center;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.result-item {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.result-label {
    color: #6c757d;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.result-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: #007bff;
    margin-bottom: 5px;
}

.result-unit {
    color: #6c757d;
    font-size: 0.85rem;
}

.paint-info {
    background: #e3f2fd;
    border-radius: 8px;
    padding: 15px;
    margin-top: 20px;
    border-left: 4px solid #2196f3;
}

.paint-info h5 {
    color: #1976d2;
    margin-bottom: 10px;
}

.paint-info p {
    color: #424242;
    margin: 5px 0;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .dimension-inputs {
        grid-template-columns: 1fr;
    }
    
    .paint-calculator-container {
        padding: 10px;
    }
    
    .paint-calculator-card {
        padding: 20px;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
}