/* FORMULAS — extracted from components.css */

/* ── FORMULA & METHODOLOGY ── */
.calc-formula-section {
    margin-bottom: var(--calc-space-12);
}

:is(.calc-formula-box, .calc-formula-section .formula-card) {
    background: var(--calc-bg-card);
    border-left: 4px solid var(--calc-cyan);
    border-radius: var(--calc-radius-md);
    padding: var(--calc-space-6);
    box-shadow: var(--calc-shadow-card), inset 0 0 0 1px rgba(0,243,255,0.06);
    margin-bottom: var(--calc-space-6);
    transition: box-shadow var(--calc-transition);
}

:is(.calc-formula-box, .calc-formula-section .formula-card):hover {
    box-shadow: var(--calc-shadow-card-hover), var(--calc-shadow-glow-cyan-sm);
}

:is(.calc-formula-box__equation, .calc-formula-section .formula-card code) {
    font-family: var(--calc-font-mono);
    font-size: var(--calc-text-lg);
    color: var(--calc-cyan);
    text-align: center;
    padding: var(--calc-space-4) 0;
    letter-spacing: 0.02em;
    overflow-wrap: break-word;
    display: block;
}

:is(.calc-formula-box__description, .calc-formula-section .formula-card p) {
    color: var(--calc-text-secondary);
    font-size: var(--calc-text-sm);
    line-height: 1.7;
    margin-top: var(--calc-space-4);
}

:is(.calc-formula-box__description strong, .calc-formula-section .formula-card p strong) {
    color: var(--calc-text-primary);
}

.calc-formula-section .formula-card h3 {
    font-family: var(--calc-font-mono);
    font-size: var(--calc-text-sm);
    font-weight: 700;
    color: var(--calc-gold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--calc-space-2);
}

.calc-formula-section p {
    color: var(--calc-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--calc-space-4);
}

.calc-formula-section a {
    color: var(--calc-text-link);
    text-decoration: none;
}

.calc-formula-section a:hover {
    text-decoration: underline;
}

/* ── Formula Strip ── */
.re-calc .formula-strip {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px 10px;
    padding: 12px 16px;
    background: var(--re-bg-card, #111d2e);
    border: 1px solid var(--re-border-card, rgba(255,255,255,0.07));
    border-radius: 10px;
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.8rem;
    color: var(--re-text-body, #8fa5c8);
}
.re-calc .formula-strip .f-op { color: var(--re-text-faint, #4d6485); }
.re-calc .formula-strip .f-val { color: var(--re-gold, #f5a623); font-weight: 600; }
.re-calc .formula-strip .f-label { font-size: 0.72rem; }

/* ── SPLIT FORMULA ── */
.formula-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--calc-space-6);
}
@media (max-width: 768px) {
    .formula-layout { grid-template-columns: 1fr; }
}

.formula-display {
    background: var(--calc-bg-card);
    border: 1px solid var(--calc-border-default);
    border-left: 4px solid var(--calc-cyan);
    border-radius: var(--calc-radius-md);
    padding: var(--calc-space-8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}
.formula-display__label {
    font-family: var(--calc-font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--calc-text-dim);
    margin-bottom: var(--calc-space-4);
}
.formula-display__equation {
    font-family: var(--calc-font-mono);
    font-size: 1.3rem;
    color: var(--calc-cyan);
    text-align: center;
    line-height: 1.8;
    overflow-wrap: break-word;
}
.formula-display__note {
    font-size: 0.78rem;
    color: var(--calc-text-dim);
    margin-top: var(--calc-space-4);
    text-align: center;
}

/* ── formula-display bare-tag children (h3 / code / p pattern) ── */
.formula-display h3 {
    font-family: var(--calc-font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--calc-text-dim);
    margin: 0 0 16px;
}
.formula-display code {
    display: block;
    font-family: var(--calc-font-mono);
    font-size: 1.1rem;
    color: var(--calc-cyan);
    text-align: center;
    line-height: 1.8;
    overflow-wrap: break-word;
    margin-bottom: 16px;
}
.formula-display p {
    font-size: 0.78rem;
    color: var(--calc-text-dim);
    text-align: center;
    line-height: 1.6;
    margin: 0;
}

.formula-variables {
    background: var(--calc-bg-card);
    border: 1px solid var(--calc-border-default);
    border-radius: var(--calc-radius-md);
    overflow: hidden;
}
.formula-variables__header {
    padding: 14px 20px;
    background: var(--calc-bg-card-elevated);
    border-bottom: 1px solid var(--calc-border-default);
    font-family: var(--calc-font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--calc-text-dim);
    display: flex;
}
.formula-variables__header span:first-child { width: 60px; }
.formula-variables__row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--calc-border-subtle);
    transition: background var(--calc-transition);
}
.formula-variables__row:last-child { border-bottom: none; }
.formula-variables__row:hover { background: rgba(255,255,255,0.04); }
.formula-variables__symbol {
    font-family: var(--calc-font-mono);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--calc-cyan);
    width: 40px;
    text-align: center;
    flex-shrink: 0;
}
.formula-variables__name {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--calc-text-primary);
}
.formula-variables__desc {
    font-size: 0.82rem;
    color: var(--calc-text-muted);
}

[data-theme="light"] .formula-variables__row:hover { background: rgba(0,0,0,0.03); }

/* ── formula-display__item (multi-formula layout) ── */
@supports selector(:has(*)) {
    .formula-display:has(.formula-display__item) {
        min-height: unset;
        align-items: stretch;
        display: flex;
        flex-direction: column;
        gap: 16px;
        border: none;
        border-left: none;
        background: transparent;
        padding: 0;
    }
}
.formula-display__item {
    background: var(--calc-bg-card);
    border: 1px solid var(--calc-border-default);
    border-radius: var(--calc-radius-md);
    padding: 18px;
}
.formula-display__item h3 {
    font-family: var(--calc-font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--calc-text-dim);
    margin: 0 0 10px;
}
.formula-display__item .formula-display__equation {
    font-size: 0.95rem;
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 10px;
    background: rgba(0,243,255,0.05);
    border: 1px solid rgba(0,243,255,0.1);
}
.formula-display__item .formula-display__desc {
    font-size: 0.8rem;
    color: var(--calc-text-dim);
    line-height: 1.55;
    text-align: left;
    margin: 0;
}
[data-theme="light"] .formula-display__item {
    background: var(--calc-bg-card);
    border-color: rgba(0,0,0,0.1);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
[data-theme="light"] .formula-display__item h3 { color: var(--calc-cyan); }
[data-theme="light"] .formula-display__item .formula-display__equation {
    background: var(--calc-bg-nested);
    color: #0891b2;
    border-color: rgba(0,0,0,0.08);
}
[data-theme="light"] .formula-display__item .formula-display__desc { color: var(--calc-text-muted); }

/* formula-display base light mode */
[data-theme="light"] .formula-display {
    background: #fff;
    border-color: rgba(0,0,0,0.1);
    border-left-color: #0E7490;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
[data-theme="light"] .formula-display h3 { color: #0E7490; }
[data-theme="light"] .formula-display code { color: #0891b2; }
[data-theme="light"] .formula-display p { color: #475569; }
[data-theme="light"] .formula-display__label { color: #0E7490; }
[data-theme="light"] .formula-display__equation { color: #0891b2; }
[data-theme="light"] .formula-display__note { color: #475569; }

/* ── standalone formula-card + formula-grid ── */
.formula-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
@media (max-width: 768px) {
    .formula-grid { grid-template-columns: 1fr; }
}
.formula-card {
    background: var(--calc-bg-card);
    border: 1px solid var(--calc-border-default);
    border-radius: var(--calc-radius-md);
    padding: 18px;
}
.formula-card h3 {
    font-family: var(--calc-font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--calc-text-dim);
    margin: 0 0 10px;
}
.formula-card code {
    display: block;
    font-family: var(--calc-font-mono);
    font-size: 0.95rem;
    color: var(--calc-cyan);
    background: rgba(0,243,255,0.05);
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid rgba(0,243,255,0.1);
    margin-bottom: 10px;
    line-height: 1.6;
}
.formula-card p {
    font-size: 0.8rem;
    color: var(--calc-text-dim);
    line-height: 1.55;
    margin: 0;
}
[data-theme="light"] .formula-card {
    background: var(--calc-bg-card);
    border-color: rgba(0,0,0,0.1);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
[data-theme="light"] .formula-card h3 { color: var(--calc-cyan); }
[data-theme="light"] .formula-card code {
    background: var(--calc-bg-nested);
    color: #0891b2;
    border-color: rgba(0,0,0,0.08);
}
[data-theme="light"] .formula-card p { color: var(--calc-text-muted); }