.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: box-volume-calculator --- */
/* 箱子体积计算器样式 */
.box-volume-calculator {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: auto;
    padding: 20px 0;
}

.calculator-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.input-section {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.input-section:hover {
    border-color: #007bff;
    box-shadow: 0 5px 15px rgba(0, 123, 255, 0.1);
}

.dimension-input {
    background: white;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 15px;
    transition: all 0.3s ease;
}

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

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

.input-group-custom .form-control {
    border-radius: 10px;
    border: 2px solid #e9ecef;
    padding: 12px 15px;
    font-size: 16px;
    transition: all 0.3s ease;
}

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

.input-group-custom .input-group-text {
    background: #007bff;
    color: white;
    border: none;
    border-radius: 0 10px 10px 0;
    font-weight: 600;
}

.btn-adjust {
    background: #007bff;
    color: white;
    border: none;
    border-radius: 8px;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    margin: 2px;
}

.btn-adjust:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.btn-adjust:active {
    transform: translateY(0);
}

.result-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.3);
}

.volume-display {
    font-size: 3rem;
    font-weight: bold;
    margin: 20px 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.unit-selector {
    background: white;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 12px 15px;
    font-size: 16px;
    transition: all 0.3s ease;
}

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

.preset-button {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    border: none;
    border-radius: 25px;
    padding: 10px 20px;
    margin: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(252, 182, 159, 0.3);
}

.preset-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(252, 182, 159, 0.4);
}

.info-badge {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
    color: #333;
    box-shadow: 0 4px 15px rgba(168, 237, 234, 0.3);
}

@media (max-width: 768px) {
    .volume-display {
        font-size: 2rem;
    }
    
    .btn-adjust {
        width: 30px;
        height: 30px;
    }
}