.math-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (min-width: 992px) {
    .math-layout {
        grid-template-columns: 320px 1fr;
    }
}

.config-panel {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.panel-title {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.form-row {
    margin-bottom: 16px;
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-row label,
.label-text {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-select,
.form-input {
    width: 100%;
    padding: 10px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 14px;
}

.form-select:focus,
.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-light);
}

.inline-row {
    display: flex;
    gap: 12px;
}

.inline-field {
    flex: 1;
}

.helper-text {
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

.mode-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.mode-btn {
    flex: 1;
    min-width: 100px;
    padding: 8px 10px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.mode-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.mode-btn:hover:not(.active) {
    background: var(--bg-hover);
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.number-type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.op-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
}

.op-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

.result-area {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    min-height: 500px;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.summary-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.print-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.print-btn:hover {
    background: var(--bg-hover);
}

@media print {
    body {
        background: #fff;
        color: #000;
    }
    .app-header,
    .app-footer,
    .config-panel,
    .result-header button,
    .usage-guide {
        display: none !important;
    }
    .main-content {
        padding: 0;
        max-width: none;
    }
    .math-layout {
        display: block;
    }
    .result-area {
        box-shadow: none;
        padding: 0;
    }
    .result-header {
        border-bottom: none;
        margin-bottom: 10px;
    }
    .vertical-grid,
    .oral-grid {
        gap: 30px 40px;
    }
    .oral-grid {
        grid-template-columns: repeat(3, 1fr); 
    }
    .vertical-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.vertical-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.vertical-item {
    font-family: "Courier New", Courier, monospace;
    font-size: 20px;
    line-height: 1.5;
    display: flex;
    justify-content: center;
}

.vertical-inner {
    display: inline-block;
    text-align: right;
}

.vertical-row {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.op-cell {
    width: 20px;
    text-align: center;
    margin-right: 4px;
}

.num-cell {
    min-width: 60px;
    text-align: right;
}

.vertical-divider {
    margin-left: 20px;
    border-bottom: 2px solid #333;
    margin-top: 2px;
    margin-bottom: 6px;
}

body[data-theme="dark"] .vertical-divider {
    border-color: #ddd;
}

.vertical-answer {
    min-height: 20px;
}

.oral-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px 24px;
    font-size: 16px;
}

.oral-item {
    display: flex;
    align-items: center;
}

.oral-text,
.oral-text-compare {
    display: inline-flex;
    align-items: center;
    flex-wrap: wrap;
}

.oral-text::after {
    content: "";
    display: inline-block;
    width: 60px;
    border-bottom: 1px solid #333;
    margin-left: 4px;
}

body[data-theme="dark"] .oral-text::after {
    border-color: #ddd;
}

.oral-text-compare::after {
    content: "";
    display: inline-block;
    width: 40px;
    border-bottom: 1px solid #333;
    margin-left: 4px;
}

.compare-side {
    display: inline-flex;
    align-items: center;
}

.op-placeholder {
    display: inline-block;
    font-size: 1.2em;
    margin: 0 8px;
    line-height: 1;
    font-family: "Times New Roman", serif; /* Ensure standard circle look */
}

body[data-theme="dark"] .oral-text-compare::after {
    border-color: #ddd;
}

.frac {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.1;
    margin: 0 1px;
}

.frac-top,
.frac-bottom {
    padding: 0 2px;
}

.frac-bar {
    border-bottom: 1px solid #333;
    width: 100%;
    margin: 1px 0;
}

body[data-theme="dark"] .frac-bar {
    border-color: #ddd;
}

.usage-guide {
    margin-top: 30px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: var(--border-radius);
}

.usage-guide h3 {
    margin-bottom: 10px;
}

.usage-guide ul {
    padding-left: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
}