.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-calculator --- */
.fraction-calculator {
    max-width:100%;
    margin: 0 auto;
    background: #f8f9fa;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.fraction-input-section {
    background: white;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.fraction-input-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.fraction-input {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.fraction-input input {
    width: 120px;
    height: 40px;
    text-align: center;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.fraction-input input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}

.fraction-line {
    width: 120px;
    height: 2px;
    background: #333;
    margin: 5px 0;
}

.operator-select {
    width: 60px;
    height: 40px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 18px;
    text-align: center;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.operator-select:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}

.calculate-btn {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,123,255,0.3);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,123,255,0.4);
}

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

.result-section {
    background: white;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.result-fraction {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    margin-bottom: 20px;
}

.result-numerator, .result-denominator {
    font-size: 24px;
    font-weight: 700;
    color: #333;
}

.result-line {
    width: 100px;
    height: 3px;
    background: #007bff;
    margin: 5px 0;
}

.result-decimal {
    font-size: 20px;
    color: #666;
    margin-top: 10px;
}

.tools-section {
    background: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.tool-btn {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: #495057;
}

.tool-btn:hover {
    background: #e9ecef;
    border-color: #007bff;
    color: #007bff;
    transform: translateY(-2px);
}

.tool-btn.active {
    background: #007bff;
    border-color: #007bff;
    color: white;
}

.fraction-display {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    padding: 15px;
    margin: 10px 0;
    text-align: center;
    font-size: 18px;
    font-weight: 600;
    color: #333;
}

.error-message {
    color: #dc3545;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    padding: 10px;
    margin: 10px 0;
    text-align: center;
}

.success-message {
    color: #155724;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 5px;
    padding: 10px;
    margin: 10px 0;
    text-align: center;
}

@media (max-width: 768px) {
    .fraction-calculator {
        padding: 20px;
    }
    
    .fraction-input-group {
        flex-direction: column;
        gap: 10px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
}