.rf-calculator-page {
    background: var(--paper);
}

/* Calculator identity */

.calculator-hero {
    padding-block: clamp(56px, 8vw, 104px);
    border-bottom: 1px solid var(--line);
    background-color: var(--paper);
    background-image:
        linear-gradient(rgba(0, 116, 217, 0.055) 1px,
            transparent 1px),
        linear-gradient(90deg,
            rgba(0, 116, 217, 0.055) 1px,
            transparent 1px);
    background-size: 32px 32px;
}

.calculator-back-link {
    display: inline-flex;
    margin-bottom: 42px;
    color: var(--blue-dark);
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-decoration: none;
    text-transform: uppercase;
}

.calculator-back-link:hover {
    color: var(--blue);
}

.calculator-hero-grid {
    display: grid;
    grid-template-columns:
        minmax(0, 1.15fr) minmax(320px, 0.85fr);
    gap: clamp(48px, 8vw, 100px);
    align-items: center;
}

.calculator-group-label {
    margin: 18px 0 14px;
    color: var(--signal-dark);
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.calculator-hero-content h1 {
    max-width: 820px;
    margin-bottom: 28px;
    font-size: clamp(3rem, 7vw, 6.2rem);
    line-height: 0.98;
}

.calculator-hero-summary {
    max-width: 680px;
    margin: 0;
    color: var(--ink-700);
    font-size: clamp(1.08rem, 2vw, 1.35rem);
    line-height: 1.55;
}

/* Scope panel */

.calculator-scope {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0, 116, 217, 0.45);
    border-radius: var(--radius);
    background:
        linear-gradient(rgba(0, 116, 217, 0.07) 1px,
            transparent 1px),
        linear-gradient(90deg,
            rgba(0, 116, 217, 0.07) 1px,
            transparent 1px),
        var(--ink-950);
    background-size: 32px 32px;
    color: #ffffff;
    box-shadow:
        0 22px 50px rgba(7, 25, 28, 0.14);
}

.calculator-scope::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 4px;
    background:
        linear-gradient(90deg,
            var(--signal) 0 32%,
            var(--blue) 32% 100%);
    content: "";
}

.calculator-scope-topline {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    padding: 24px 28px;
    border-bottom: 1px solid var(--dark-line);
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
}

.calculator-scope-topline span:last-child {
    color: #68c8ff;
}

.calculator-scope dl {
    margin: 0;
    padding: 8px 28px 20px;
}

.calculator-scope dl div {
    display: grid;
    grid-template-columns: 92px 1fr;
    gap: 20px;
    padding-block: 20px;
    border-bottom: 1px solid var(--dark-line);
}

.calculator-scope dl div:last-child {
    border-bottom: 0;
}

.calculator-scope dt {
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.calculator-scope dd {
    margin: 0;
    color: rgba(255, 255, 255, 0.88);
    line-height: 1.55;
}

/* Page-specific calculator content */

.calculator-content {
    background: var(--surface);
}

.calculator-workspace {
    padding-block: clamp(64px, 9vw, 112px);
}

.calculator-workspace-grid {
    display: grid;
    grid-template-columns:
        minmax(0, 1.2fr) minmax(300px, 0.8fr);
    gap: 28px;
    align-items: start;
}

.calculator-panel {
    padding: clamp(24px, 4vw, 42px);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow-small);
}

.calculator-panel-header {
    margin-bottom: 30px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--line);
}

.calculator-panel-header h2 {
    margin-bottom: 10px;
}

.calculator-panel-header p {
    max-width: 64ch;
    margin: 0;
    color: var(--muted);
}

.calculator-field-grid {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr) minmax(160px, 0.42fr);
    gap: 18px;
}

.calculator-field {
    display: grid;
    gap: 8px;
}

.calculator-field label,
.calculator-field>span:first-child {
    color: var(--ink-900);
    font-size: 0.88rem;
    font-weight: 600;
}

.calculator-field input,
.calculator-field select {
    width: 100%;
    min-height: 50px;
    padding: 11px 13px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-small);
    background: #ffffff;
    color: var(--text);
}

.calculator-field input:focus,
.calculator-field select:focus {
    border-color: var(--blue);
    outline: 3px solid rgba(0, 116, 217, 0.13);
    outline-offset: 1px;
}

.calculator-field-note {
    color: var(--muted);
    font-size: 0.78rem;
}

.calculator-status {
    min-height: 24px;
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.calculator-status.is-error {
    color: #a12c2c;
}

/* Results */

.calculator-results {
    display: grid;
    gap: 12px;
}

.calculator-result {
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: var(--radius-small);
    background: var(--surface-soft);
}

.calculator-result span {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.calculator-result output {
    display: block;
    overflow-wrap: anywhere;
    color: var(--ink-950);
    font-family: var(--font-mono);
    font-size: clamp(1.2rem, 2.4vw, 1.7rem);
    font-weight: 600;
}

.calculator-result.is-source {
    border-color: rgba(0, 116, 217, 0.48);
    background: rgba(0, 116, 217, 0.06);
}

/* Equations and assumptions */

.calculator-reference {
    padding-block: clamp(64px, 9vw, 110px);
    border-top: 1px solid var(--line);
    background: var(--surface-soft);
}

.calculator-reference-grid {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr) minmax(280px, 0.72fr);
    gap: clamp(40px, 7vw, 90px);
    align-items: start;
}

.calculator-equations,
.calculator-notes {
    padding-top: 24px;
    border-top: 1px solid var(--line-strong);
}

.calculator-equations h2,
.calculator-notes h2 {
    margin-bottom: 22px;
}

.calculator-equation {
    margin-bottom: 16px;
    padding: 18px 20px;
    border: 1px solid var(--line);
    background: var(--surface);
    font-family: var(--font-mono);
    overflow-x: auto;
}

.calculator-notes ul {
    margin: 0;
    padding-left: 20px;
}

.calculator-notes li+li {
    margin-top: 12px;
}

/* General engineering note */

.calculator-general-note {
    padding-block: clamp(52px, 7vw, 84px);
    border-top: 1px solid var(--line);
    background: var(--paper);
}

.calculator-general-note-inner {
    max-width: var(--reading-width);
    margin-inline: auto;
}

.calculator-general-note h2 {
    margin-bottom: 14px;
}

.calculator-general-note p:last-child {
    margin-bottom: 0;
    color: var(--muted);
}

/* Responsive */

@media (max-width: 900px) {

    .calculator-hero-grid,
    .calculator-workspace-grid,
    .calculator-reference-grid {
        grid-template-columns: 1fr;
    }

    .calculator-scope {
        max-width: 680px;
    }
}

@media (max-width: 620px) {
    .calculator-back-link {
        margin-bottom: 30px;
    }

    .calculator-hero-content h1 {
        font-size: clamp(2.8rem, 15vw, 4.5rem);
    }

    .calculator-field-grid {
        grid-template-columns: 1fr;
    }

    .calculator-scope-topline {
        align-items: flex-start;
        flex-direction: column;
        gap: 5px;
    }

    .calculator-scope dl div {
        grid-template-columns: 1fr;
        gap: 6px;
    }
}