.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: self-leveling-floor-calculator --- */
/* 自流平地板计算器样式 */
.self-leveling-calculator {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
}

.input-section {
    background: #e3f2fd;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.input-section h6 {
    color: #1976d2;
    font-weight: 600;
    margin-bottom: 15px;
}

.custom-input-group {
    position: relative;
    display: flex;
    align-items: center;
    background: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow: hidden;
}

.custom-input-group input {
    border: none;
    outline: none;
    padding: 12px 15px;
    flex: 1;
    font-size: 16px;
}

.custom-input-group .unit {
    padding: 12px 15px;
    background: #f5f5f5;
    color: #666;
    font-size: 14px;
    border-left: 1px solid #ddd;
}

.custom-input-group .btn-group {
    display: flex;
    flex-direction: column;
}

.custom-input-group .btn-group button {
    border: none;
    background: #f0f0f0;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

.custom-input-group .btn-group button:hover {
    background: #e0e0e0;
}

.custom-input-group .btn-group button:first-child {
    border-bottom: 1px solid #ddd;
}

.form-label {
    font-weight: 500;
    color: #333;
    margin-bottom: 8px;
}

.form-select {
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 12px 15px;
    background: white;
}

.calculate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.calculate-btn:hover {
    transform: translateY(-2px);
}

.result-section {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-top: 20px;
}

.result-item {
    text-align: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 15px;
}

.result-value {
    font-size: 24px;
    font-weight: bold;
    color: #1976d2;
    margin: 8px 0;
}

.result-label {
    color: #666;
    font-size: 14px;
}

.result-unit {
    color: #999;
    font-size: 12px;
}

.cost-breakdown {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.cost-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.cost-item:last-child {
    border-bottom: none;
    font-weight: bold;
    font-size: 18px;
    color: #1976d2;
}

@media (max-width: 768px) {
    .custom-input-group {
        flex-direction: column;
    }
    
    .custom-input-group .btn-group {
        flex-direction: row;
        width: 100%;
    }
    
    .custom-input-group .btn-group button {
        flex: 1;
    }
}