/* math-calculator — follows site theme variables (V3.9 5.1/5.2/5.3) */
.math-calculator-container {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    font-size: 14px;
    color: var(--text, #1f2328);
}
.math-calculator-container *,
.math-calculator-container *::before,
.math-calculator-container *::after {
    box-sizing: border-box;
}
.math-calculator-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 14px;
    align-items: start;
}
.math-calculator-panel {
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius, 12px);
    background: var(--bg-card, var(--bg-input, #fff));
    padding: 14px;
    margin-bottom: 14px;
    min-width: 0;
}
.math-calculator-head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 12px;
}
.math-calculator-headt { font-weight: 600; font-size: 15px; }
.math-calculator-heads { color: var(--text-secondary, #6b7280); font-size: 12px; }
.math-calculator-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    min-width: 0;
}
.math-calculator-row-between { justify-content: space-between; }
.math-calculator-col {
    flex: 1 1 0;
    min-width: 70px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.math-calculator-col-wide { flex: 2 1 0; }
.math-calculator-lbl { font-size: 12px; color: var(--text-secondary, #6b7280); }
.math-calculator-input,
.math-calculator-select {
    width: 100%;
    min-width: 0;
    padding: 8px 10px;
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius-sm, 8px);
    background: var(--bg-input, #fff);
    color: var(--text, #1f2328);
    font-size: 14px;
}
.math-calculator-input:focus,
.math-calculator-select:focus {
    outline: 2px solid var(--primary, #2563eb);
    outline-offset: 1px;
}
.math-calculator-expr { flex: 1 1 200px; font-family: ui-monospace, Menlo, Consolas, monospace; }
.math-calculator-textarea {
    width: 100%;
    min-height: 72px;
    padding: 8px 10px;
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius-sm, 8px);
    background: var(--bg-input, #fff);
    color: var(--text, #1f2328);
    font-size: 13px;
    resize: vertical;
}
.math-calculator-textarea:focus {
    outline: 2px solid var(--primary, #2563eb);
    outline-offset: 1px;
}
.math-calculator-btn {
    padding: 8px 14px;
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius-sm, 8px);
    background: var(--bg-btn, #f3f4f6);
    color: var(--text, #1f2328);
    font-size: 13px;
    cursor: pointer;
    transition: background .15s;
}
.math-calculator-btn:hover { background: var(--bg-btn-hover, #e5e7eb); }
.math-calculator-btn:focus-visible { outline: 2px solid var(--primary, #2563eb); outline-offset: 1px; }
.math-calculator-btn-primary {
    background: var(--primary, #2563eb);
    border-color: var(--primary, #2563eb);
    color: #fff;
}
.math-calculator-btn-primary:hover { background: var(--primary-hover, #1d4ed8); }
.math-calculator-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.math-calculator-seg {
    display: inline-flex;
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius-sm, 8px);
    overflow: hidden;
}
.math-calculator-seg button {
    border: 0;
    background: var(--bg-btn, #f3f4f6);
    color: var(--text, #1f2328);
    padding: 6px 12px;
    font-size: 13px;
    cursor: pointer;
}
.math-calculator-seg button[aria-pressed="true"] {
    background: var(--primary, #2563eb);
    color: #fff;
}
.math-calculator-kb {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    margin-bottom: 8px;
}
.math-calculator-fnrow {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
    margin-bottom: 10px;
}
.math-calculator-k {
    padding: 10px 0;
    border: 1px solid var(--border, #e5e7eb);
    border-radius: var(--radius-sm, 8px);
    background: var(--bg-btn, #f3f4f6);
    color: var(--text, #1f2328);
    font-size: 15px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    transition: background .12s;
}
.math-calculator-k:hover { background: var(--bg-btn-hover, #e5e7eb); }
.math-calculator-k:active { transform: translateY(1px); }
.math-calculator-k-op { color: var(--primary, #2563eb); font-weight: 600; }
.math-calculator-k-fn { font-size: 13px; color: var(--text-secondary, #6b7280); }
.math-calculator-k-clr { color: var(--danger, #dc2626); font-weight: 600; }
.math-calculator-result {
    min-height: 22px;
    padding: 8px 10px;
    margin-top: 2px;
    border-radius: var(--radius-sm, 8px);
    background: var(--bg-input, #f9fafb);
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 14px;
    word-break: break-all;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}
.math-calculator-result-sm { margin-top: 8px; }
.math-calculator-result-err { color: var(--danger, #dc2626); }
.math-calculator-msg {
    min-height: 16px;
    margin: 6px 0 0;
    font-size: 12px;
    color: var(--success, #16a34a);
}
.math-calculator-msg-err { color: var(--danger, #dc2626); }
.math-calculator-kv {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
    min-width: 0;
}
.math-calculator-kvrow {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 5px 8px;
    border-radius: var(--radius-sm, 6px);
    background: var(--bg-input, #f9fafb);
    font-size: 13px;
    min-width: 0;
}
.math-calculator-kvk { color: var(--text-secondary, #6b7280); flex: 0 0 auto; }
.math-calculator-kvv {
    font-family: ui-monospace, Menlo, Consolas, monospace;
    word-break: break-all;
    overflow-wrap: anywhere;
    text-align: right;
}
.math-calculator-ref { font-size: 12px; color: var(--text-secondary, #6b7280); }
.math-calculator-ref-l { font-weight: 600; margin: 8px 0 2px; color: var(--text, #1f2328); }
.math-calculator-ref-l:first-child { margin-top: 0; }
.math-calculator-ref-v {
    margin: 0 0 4px;
    line-height: 1.6;
    word-break: break-all;
    overflow-wrap: anywhere;
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 11px;
}
@media (max-width: 860px) {
    .math-calculator-layout { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 420px) {
    .math-calculator-fnrow { grid-template-columns: repeat(4, 1fr); }
    .math-calculator-panel { padding: 12px; }
}