/* =========================
   Scientific Calculator (scoped)
   only inside .ccalc
========================= */

.ccalc,
.ccalc * {
    box-sizing: border-box;
}

.ccalc {
    --m-card: #fff;
    --m-text: #222;
    --m-muted: #6b7280;
    --m-brand: #283b69;
    --m-brand2: #1f2f55;
    --m-border: #e6e8ef;
    --m-shadow: 0 1px 3px rgba(31, 47, 85, .06), 0 10px 30px rgba(40, 59, 105, .14);
    --m-radius: 20px;

    font-family: Arial, Helvetica, sans-serif;
    color: var(--m-text);
}

.ccalc .mcalc__wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px 0 40px;
}

.ccalc .mcalc__titlebar {
    background: var(--header-grad-solid, linear-gradient(180deg, #2c3b5f 0%, #40527e 55%, #566a9e 100%));
    color: #fff;
    border-radius: var(--m-radius);
    padding: 16px;
    box-shadow: var(--m-shadow);
    margin-bottom: 14px;
}

.ccalc .mcalc__h1 {
    margin: 0;
    font-size: 20px;
    font-weight: 800;
}

.ccalc .mcalc__p {
    margin: 6px 0 0;
    opacity: .92;
    font-size: 13px;
}

/* GRID: calculator left, history right */
.ccalc__grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
    align-items: start;
}

@media (max-width: 900px) {
    .ccalc__grid {
        grid-template-columns: 1fr;
    }
}

.ccalc__card {
    background: var(--m-card);
    border: 1px solid var(--m-border);
    border-radius: var(--m-radius);
    box-shadow: var(--m-shadow);
    padding: 14px;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.ccalc .mcalc__sectionTitle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding-bottom: 10px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--m-border);
}

.ccalc .mcalc__h2 {
    font-size: 15px;
    margin: 0;
    font-weight: 800;
    color: var(--m-brand2);
}

.ccalc .mcalc__badge {
    font-size: 12px;
    color: #fff;
    background: rgba(40, 59, 105, .9);
    padding: 6px 10px;
    border-radius: 999px;
    white-space: nowrap;
}

/* Toolbar: DEG/RAD + Inv */
.ccalc__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.ccalc__toggleGroup {
    display: inline-flex;
    border: 1px solid var(--m-border);
    border-radius: 10px;
    overflow: hidden;
}

.ccalc__toggleBtn {
    height: 34px;
    padding: 0 14px;
    border: none;
    background: #fff;
    color: #6b7280;
    font-weight: 900;
    font-size: 12px;
    cursor: pointer;
    transition: background .15s ease, color .15s ease;
}

.ccalc__toggleGroup .ccalc__toggleBtn+.ccalc__toggleBtn {
    border-left: 1px solid var(--m-border);
}

.ccalc__toggleBtn.is-active {
    background: rgba(40, 59, 105, .10);
    color: var(--m-brand2);
}

button.ccalc__toggleBtn#invToggle {
    border-radius: 10px;
    border: 1px solid var(--m-border);
}

button.ccalc__toggleBtn#invToggle.is-active {
    background: rgba(251, 191, 36, .16);
    border-color: rgba(251, 191, 36, .45);
    color: #8a4b00;
}

/* Display */
.ccalc__display {
    background: linear-gradient(180deg, #f6f7fb, #eef0f7);
    border: 1px solid var(--m-border);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 12px;
    min-height: 92px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    gap: 4px;
    overflow: hidden;
}

.ccalc__expr {
    font-size: 14px;
    color: var(--m-muted);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
    text-align: right;
    width: 100%;
}

.ccalc__result {
    font-size: 30px;
    font-weight: 900;
    color: var(--m-brand2);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
    text-align: right;
    width: 100%;
    min-height: 36px;
}

.ccalc__toast {
    font-size: 12px;
    color: var(--m-muted);
    min-height: 14px;
    width: 100%;
    text-align: right;
}

/* Keypad grid */
.ccalc__keys {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
}

.ccalc__key {
    height: 48px;
    border-radius: 12px;
    border: 1px solid #d4d7de;
    background: #fff;
    cursor: pointer;
    font-weight: 900;
    font-size: 15px;
    color: #1f2f55;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background .12s ease, border-color .12s ease, transform .06s ease;
}

.ccalc__key:hover {
    background: #f6f7fb;
    border-color: #b9c2da;
}

.ccalc__key:active {
    transform: scale(0.96);
}

.ccalc__key--fn {
    background: rgba(40, 59, 105, .05);
    font-size: 13px;
    color: #2b3a55;
}

.ccalc__key--fn:hover {
    background: rgba(40, 59, 105, .10);
}

.ccalc__key--op {
    background: rgba(40, 59, 105, .08);
    border-color: rgba(40, 59, 105, .28);
    color: var(--m-brand2);
    font-size: 18px;
}

.ccalc__key--op:hover {
    background: rgba(40, 59, 105, .16);
}

.ccalc__key--equals {
    grid-column: span 1;
    background: linear-gradient(180deg, #e9f7ef, #dff4e8);
    border-color: #bfe3cd;
    color: #1f513a;
    font-size: 20px;
}

.ccalc__key--equals:hover {
    background: linear-gradient(180deg, #dff4e8, #cdeedb);
}

@media (max-width: 420px) {
    .ccalc__key {
        height: 42px;
        font-size: 13px;
    }

    .ccalc__key--op {
        font-size: 16px;
    }
}

/* History panel */
.ccalc__historyActions {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.ccalc__history {
    flex: 1;
    min-height: 240px;
    max-height: 480px;
    overflow-y: auto;
    border: 1px solid var(--m-border);
    border-radius: 14px;
    background: #fafbfd;
}

.ccalc__historyEmpty {
    padding: 24px 16px;
    text-align: center;
    color: var(--m-muted);
    font-size: 13px;
}

.ccalc__historyItem {
    padding: 10px 14px;
    border-bottom: 1px solid var(--m-border);
    cursor: pointer;
    transition: background .12s ease;
}

.ccalc__historyItem:last-child {
    border-bottom: none;
}

.ccalc__historyItem:hover {
    background: rgba(40, 59, 105, .05);
}

.ccalc__historyExpr {
    font-size: 12px;
    color: var(--m-muted);
    word-break: break-all;
}

.ccalc__historyResult {
    font-size: 16px;
    font-weight: 900;
    color: var(--m-brand2);
    word-break: break-all;
}

/* Divider + SEO/FAQ reuse from plaster-calculator naming (m-divider, m-seo, m-faq) */
.ccalc~.m-divider,
.m-divider {
    width: 100%;
    max-width: 900px;
    margin: 20px auto;
    border-top: 2px dashed rgba(40, 59, 105, .35);
}

.m-seo,
.m-faq {
    max-width: 900px;
    margin: 20px auto 0;
    padding: 0 16px;
}

.m-seo h2,
.m-faq h2 {
    font-size: 22px;
    color: #283b69;
    margin-bottom: 14px;
}

.m-seo p,
.m-seo li {
    margin-bottom: 14px;
    line-height: 1.6;
    font-size: 15px;
    color: #222;
}

.m-faq-item {
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 14px;
    box-shadow: 0 6px 16px rgba(40, 59, 105, .09);
    border: 1px solid rgba(40, 59, 105, .10);
}

.m-faq-item h3 {
    font-size: 16px;
    margin: 0 0 6px;
    color: #283b69;
    font-weight: 900;
}

.m-faq-item p {
    font-size: 14px;
    color: #444;
    line-height: 1.6;
    margin: 0;
}

.m-hintSmall {
    margin-top: 6px;
    font-size: 12px;
    color: rgba(75, 85, 99, .88);
    line-height: 1.45;
}

/* Bottom nav links (reuse m-navlinks style) */
.m-navlinks {
    display: flex;
    gap: 10px;
    margin-top: 14px;
}

.m-navlinks a {
    flex: 1;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6px 10px;
    border-radius: 12px;
    border: 1px solid #9ad8b1;
    background: linear-gradient(180deg, #e9f7ef, #f6fbf8);
    color: #1f513a;
    font-weight: 900;
    font-size: 13px;
    line-height: 1.15;
    text-decoration: none;
    white-space: normal;
}

.m-navlinks a:hover {
    border-color: #7ecb9b;
    box-shadow: 0 8px 18px rgba(46, 125, 90, .12);
}

@media (max-width: 520px) {
    .m-navlinks {
        flex-direction: column;
    }

    .m-seo h2,
    .m-faq h2 {
        font-size: 18px;
    }

    .m-seo p,
    .m-seo li {
        font-size: 14px;
    }

    .m-faq-item {
        padding: 14px;
    }
}
/* Distinguish memory save/clear visually */
.ccalc__key[data-fn="ms"] {
    background: rgba(46, 125, 90, .08);
    border-color: rgba(46, 125, 90, .30);
    color: #1f513a;
}

.ccalc__key[data-fn="ms"]:hover {
    background: rgba(46, 125, 90, .16);
}

.ccalc__key[data-fn="mc"] {
    background: rgba(220, 38, 38, .06);
    border-color: rgba(220, 38, 38, .25);
    color: #7f1d1d;
}

.ccalc__key[data-fn="mc"]:hover {
    background: rgba(220, 38, 38, .12);
}

/* Distinguish memory save/clear visually */
.ccalc__key[data-fn="ms"] {
    background: rgba(46, 125, 90, .08);
    border-color: rgba(46, 125, 90, .30);
    color: #1f513a;
}

.ccalc__key[data-fn="ms"]:hover {
    background: rgba(46, 125, 90, .16);
}

.ccalc__key[data-fn="mc"] {
    background: rgba(220, 38, 38, .06);
    border-color: rgba(220, 38, 38, .25);
    color: #7f1d1d;
}

.ccalc__key[data-fn="mc"]:hover {
    background: rgba(220, 38, 38, .12);
}

/* Darker C / CE buttons */
.ccalc__key[data-fn="clear"],
.ccalc__key[data-fn="ce"] {
    background: rgba(40, 59, 105, .14);
    border-color: rgba(40, 59, 105, .40);
    color: #1f2f55;
    font-weight: 900;
}

.ccalc__key[data-fn="clear"]:hover,
.ccalc__key[data-fn="ce"]:hover {
    background: rgba(40, 59, 105, .22);
}
/* Fix unstyled buttons in history panel */
.ccalc .mcalc__btn {
    height: 44px;
    padding: 0 14px;
    border-radius: 12px;
    border: 1px solid #d4d7de;
    background: #fff;
    cursor: pointer;
    font-weight: 900;
    color: #1f2f55;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background .15s ease, border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}

.ccalc .mcalc__btn:hover {
    background: #f6f7fb;
    border-color: #b9c2da;
    box-shadow: 0 6px 16px rgba(31, 47, 85, .12);
}

.ccalc .mcalc__btn--small {
    height: 36px;
    padding: 0 12px;
    border-radius: 10px;
    font-size: 13px;
}