.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: fraction-power-calculator --- */
.fraction-power-calculator {
    background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
    min-height: auto;
    padding: 20px 0;
}

.math-expression {
    font-size: 3rem;
    font-weight: bold;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin: 20px 0;
}

.math-parentheses {
    color: #000;
    font-size: 4rem;
}

.math-base {
    color: #000;
    font-size: 3.5rem;
}

.math-fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    margin: 0 5px;
}

.math-numerator {
    color: #000;
    font-size: 2.5rem;
    line-height: 1;
}

.math-fraction-line {
    width: 100%;
    height: 3px;
    background-color: #000;
    margin: 2px 0;
}

.math-denominator {
    color: #000;
    font-size: 2.5rem;
    line-height: 1;
}

.math-exponent {
    color: #007bff;
    font-size: 2.5rem;
    vertical-align: super;
    margin-left: 5px;
}

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

.input-group-append .btn-group-vertical .btn {
    border-radius: 0;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

.input-group-append .btn-group-vertical .btn:first-child {
    border-top-right-radius: 0.375rem;
}

.input-group-append .btn-group-vertical .btn:last-child {
    border-bottom-right-radius: 0.375rem;
}

.result-box {
    border-radius: 0.5rem;
    overflow: hidden;
}

#expression-display {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: #495057;
}

#result-display {
    font-size: 1.5rem;
    font-weight: bold;
    color: #28a745;
}

#calculation-steps {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #6c757d;
    background-color: #f8f9fa;
    padding: 10px;
    border-radius: 0.25rem;
    border-left: 4px solid #007bff;
}

@media (max-width: 768px) {
    .math-expression {
        font-size: 2rem;
    }
    
    .math-parentheses {
        font-size: 2.5rem;
    }
    
    .math-base {
        font-size: 2.2rem;
    }
    
    .math-numerator,
    .math-denominator {
        font-size: 1.8rem;
    }
    
    .math-exponent {
        font-size: 1.8rem;
    }
}