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

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

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

.academic-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);
}

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

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

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

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

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

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

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

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

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

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

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

/* --- tool: scientific-calculator --- */
.scientific-calculator {
    padding: 20px 0;
}

.calculator-container {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    max-width: 400px;
    margin: 0 auto;
}

.calculator-display {
    background: #fff;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.display-expression {
    font-size: 14px;
    color: #6c757d;
    min-height: 20px;
    word-wrap: break-word;
    text-align: right;
}

.display-result {
    font-size: 24px;
    font-weight: bold;
    color: #212529;
    text-align: right;
    min-height: 30px;
}

.calculator-buttons {
    display: grid;
    gap: 8px;
}

.button-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.calc-btn {
    border: none;
    border-radius: 8px;
    padding: 12px 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

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

.number-btn {
    background: #fff;
    color: #212529;
    border: 1px solid #dee2e6;
}

.number-btn:hover {
    background: #e9ecef;
}

.operator-btn {
    background: #007bff;
    color: white;
}

.operator-btn:hover {
    background: #0056b3;
}

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

.function-btn:hover {
    background: #545b62;
}

.equals-btn {
    background: #28a745;
    color: white;
}

.equals-btn:hover {
    background: #1e7e34;
}

.calculator-info {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
}

.calculator-info h5 {
    color: #495057;
    border-bottom: 2px solid #dee2e6;
    padding-bottom: 10px;
}

.calculator-info ul li {
    margin-bottom: 8px;
    color: #6c757d;
}

@media (max-width: 576px) {
    .calculator-container {
        padding: 15px;
    }
    
    .calc-btn {
        padding: 10px 6px;
        font-size: 14px;
        min-height: 45px;
    }
    
    .display-result {
        font-size: 20px;
    }
}