.subcalculator-shell {
    min-height: calc(100dvh - 120px);
    padding: 146px 0 110px;
}

.subcalculator-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    padding: 6px 0;
    margin-bottom: 48px;
    color: var(--text-secondary);
    font-size: 0.84rem;
    font-weight: 600;
}

.subcalculator-back svg {
    width: 18px;
    height: 18px;
    transition: transform var(--dur-fast) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
    .subcalculator-back:hover svg {
        transform: translateX(-3px);
    }
}

.subcalculator-header {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.65fr);
    align-items: end;
    gap: 64px;
    margin-bottom: 58px;
}

.subcalculator-header h1 {
    max-width: 13ch;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: clamp(3.2rem, 7vw, 5.6rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 0.95;
    text-wrap: balance;
}

.subcalculator-header p {
    max-width: 50ch;
    padding-bottom: 5px;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    text-wrap: pretty;
}

.subcalculator-workspace {
    display: grid;
    grid-template-columns: minmax(19rem, 0.86fr) minmax(0, 1.14fr);
    gap: 16px;
    animation: fadeInUp 500ms var(--ease-out) both;
}

.subcalculator-form,
.subcalculator-result {
    min-width: 0;
    border-radius: var(--radius-lg);
    padding: 30px;
}

.subcalculator-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
}

.subcalculator-result {
    display: flex;
    min-height: 31rem;
    flex-direction: column;
    background:
        radial-gradient(circle at 72% 8%, rgba(241, 184, 75, 0.1), transparent 18rem),
        #111615;
    border: 1px solid rgba(241, 184, 75, 0.19);
}

.subcalculator-panel-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 4px;
}

.subcalculator-panel-heading h2 {
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
}

.subcalculator-panel-heading > span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--text-secondary);
    font-size: 0.74rem;
    font-weight: 600;
}

.subcalculator-panel-heading i {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-2);
}

.subcalculator-field {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.subcalculator-field label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
}

.subcalculator-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.subcalculator-input-wrap input,
.subcalculator-field select {
    width: 100%;
    min-height: 52px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    outline: none;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.94rem;
    transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}

.subcalculator-input-wrap input {
    padding: 13px 52px 13px 16px;
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

.subcalculator-input-wrap span {
    position: absolute;
    right: 15px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    pointer-events: none;
}

.subcalculator-field select {
    padding: 13px 42px 13px 16px;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%238d958f' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    cursor: pointer;
}

.subcalculator-field select option {
    background: #0a0f10;
    color: var(--text-primary);
}

.subcalculator-input-wrap input:focus,
.subcalculator-field select:focus {
    border-color: rgba(241, 184, 75, 0.48);
    box-shadow: 0 0 0 3px rgba(241, 184, 75, 0.1);
}

.subcalculator-input-wrap input[aria-invalid="true"] {
    border-color: #dc7a68;
    box-shadow: 0 0 0 3px rgba(220, 122, 104, 0.12);
}

.subcalculator-inline-note {
    margin-top: -2px;
    color: var(--text-tertiary);
    font-size: 0.8rem;
    line-height: 1.6;
}

.subcalculator-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
    padding-top: 4px;
}

.subcalculator-actions .btn-calculate {
    min-height: 48px;
}

.subcalculator-actions .btn-reset {
    min-height: 48px;
}

.subcalculator-result-value {
    display: flex;
    flex: 1;
    flex-direction: column;
    justify-content: center;
    padding: 42px 0;
}

.subcalculator-result-value #subResult {
    color: var(--accent-1);
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 8vw, 6rem);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.04em;
    line-height: 0.95;
    text-wrap: balance;
}

.subcalculator-result-value p {
    margin-top: 14px;
    color: var(--text-secondary);
    font-size: 0.84rem;
}

.subcalculator-formula {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 18px 0 20px;
    border-bottom: 1px solid var(--border-subtle);
}

.subcalculator-formula span {
    color: var(--text-tertiary);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.subcalculator-formula code {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.84rem;
    line-height: 1.65;
    overflow-wrap: anywhere;
}

@media (prefers-reduced-motion: reduce) {
    .subcalculator-workspace {
        animation: none;
    }
}

@media (max-width: 900px) {
    .subcalculator-header {
        display: block;
    }

    .subcalculator-header h1 {
        margin-bottom: 24px;
    }

    .subcalculator-workspace {
        grid-template-columns: 1fr;
    }

    .subcalculator-result {
        min-height: 27rem;
    }
}

@media (max-width: 600px) {
    .subcalculator-shell {
        padding: 116px 0 72px;
    }

    .subcalculator-back {
        margin-bottom: 34px;
    }

    .subcalculator-header {
        margin-bottom: 40px;
    }

    .subcalculator-header h1 {
        font-size: clamp(2.7rem, 13vw, 4.3rem);
    }

    .subcalculator-form,
    .subcalculator-result {
        padding: 22px 20px;
    }

    .subcalculator-result {
        min-height: 23rem;
    }

    .subcalculator-result-value #subResult {
        font-size: clamp(3rem, 17vw, 4.8rem);
    }
}

@media (max-width: 420px) {
    .subcalculator-actions {
        flex-direction: column;
    }
}

/* ========================================================================
   SUBCALCULATOR CONTENT SECTIONS
   ======================================================================== */
.subcalc-content-section {
    padding: 88px 0;
    border-top: 1px solid var(--border-subtle);
}

.subcalc-content-section + .subcalc-content-section {
    padding-top: 80px;
}

.subcalc-section-header {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.85fr);
    align-items: end;
    gap: 48px;
    margin-bottom: 52px;
}

.subcalc-section-header .section-title {
    margin-bottom: 0;
}

.subcalc-section-header .section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 66ch;
    margin: 0;
    line-height: 1.7;
    text-wrap: pretty;
}

/* Scroll margin for anchor links */
.subcalc-content-section[id] {
    scroll-margin-top: 88px;
}

/* Steps grid overrides — match homepage pattern */
.subcalc-content-section .content-steps-grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 28px;
    margin-bottom: 40px;
}

.subcalc-content-section .content-step-card {
    background: transparent;
    border: 0;
    border-top: 1px solid var(--border-subtle);
    border-radius: 0;
    padding: 24px 12px 0 0;
    position: relative;
    transition:
        border-color var(--dur-fast) var(--ease-out),
        transform var(--dur-normal) var(--ease-out);
}

.subcalc-content-section .content-step-card:nth-child(1) { grid-column: span 5; }
.subcalc-content-section .content-step-card:nth-child(2) { grid-column: span 4; }
.subcalc-content-section .content-step-card:nth-child(3) { grid-column: span 3; }

@media (hover: hover) and (pointer: fine) {
    .subcalc-content-section .content-step-card:hover {
        border-color: var(--accent-1);
        transform: translateY(-2px);
    }
}

.subcalc-content-section .step-number {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.15);
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-1);
    margin-bottom: 14px;
}

.subcalc-content-section .content-step-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
    line-height: 1.7;
}

.subcalc-content-section .content-step-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.7;
}

/* Content cards — match homepage */
.subcalc-content-section .content-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: border-color var(--dur-fast) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
    .subcalc-content-section .content-card:hover {
        border-color: var(--border-glow);
    }
}

.subcalc-content-section .content-card p {
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 10px;
    font-size: 0.92rem;
}

.subcalc-content-section .content-card p:last-child {
    margin-bottom: 0;
}

.subcalc-content-section .content-note {
    border-left: 1px solid var(--accent-1);
    background: rgba(241, 184, 75, 0.045);
}

/* Formula grid — match homepage */
.subcalc-content-section .formula-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
    gap: 16px;
}

.subcalc-content-section .formula-display {
    background: rgba(241, 184, 75, 0.045);
    border: 1px solid rgba(241, 184, 75, 0.12);
    border-radius: var(--radius-md);
    padding: 18px;
    margin: 14px 0;
    text-align: center;
}

.subcalc-content-section .formula-equation {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--accent-1);
    letter-spacing: 0.01em;
}

.subcalc-content-section .content-card .formula-sub-heading {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-top: 22px;
    margin-bottom: 6px;
    color: var(--text-primary);
    line-height: 1.7;
}

.subcalc-content-section .content-card .formula-sub-heading:first-child {
    margin-top: 0;
}

.subcalc-content-section .content-card-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text-primary);
    line-height: 1.7;
}

.subcalc-content-section .formula-example {
    background: rgba(0, 0, 0, 0.12);
    border: 1px solid rgba(239, 235, 220, 0.07);
    border-radius: var(--radius-sm);
    padding: 14px;
    margin-bottom: 10px;
}

.subcalc-content-section .formula-example .formula-example-title {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-accent);
    margin-bottom: 6px;
    line-height: 1.7;
}

.subcalc-content-section .formula-example code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.subcalc-content-section .formula-example code strong {
    color: var(--accent-1);
}

/* Table — match homepage */
.subcalc-content-section .table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.subcalc-content-section .table-header {
    padding: 22px 24px 0;
}

.subcalc-content-section .table-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.7;
}

.subcalc-content-section .conversion-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 14px;
}

.subcalc-content-section .conversion-table th {
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 12px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
    white-space: nowrap;
}

.subcalc-content-section .conversion-table td {
    padding: 10px 18px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    font-variant-numeric: tabular-nums;
}

.subcalc-content-section .conversion-table tbody tr {
    transition: background var(--dur-fast) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
    .subcalc-content-section .conversion-table tbody tr:hover td {
        background: rgba(245, 158, 11, 0.02);
    }
}

.subcalc-content-section .conversion-table .mono {
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

.subcalc-content-section .conversion-table th:first-child,
.subcalc-content-section .conversion-table td:first-child {
    position: sticky;
    left: 0;
    z-index: 1;
    background: #101516;
}

/* ========================================================================
   SUBCALCULATOR CONTENT — RESPONSIVE
   ======================================================================== */
@media (max-width: 900px) {
    .subcalc-section-header {
        display: block;
    }

    .subcalc-section-header .section-title {
        margin-bottom: 16px;
    }

    .subcalc-content-section .content-steps-grid {
        grid-template-columns: 1fr;
    }

    .subcalc-content-section .content-step-card:nth-child(1),
    .subcalc-content-section .content-step-card:nth-child(2),
    .subcalc-content-section .content-step-card:nth-child(3) {
        grid-column: span 1;
    }

    .subcalc-content-section .formula-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .subcalc-content-section {
        padding: 64px 0;
    }

    .subcalc-section-header {
        margin-bottom: 36px;
    }

    .subcalc-content-section .content-card {
        padding: 22px 20px;
    }

    .subcalc-content-section .formula-equation {
        font-size: 0.88rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .subcalc-content-section .content-step-card:hover {
        transform: none;
    }
}