.calculator-hero {
    position: relative;
    overflow: hidden;
    padding: calc(72px + clamp(3.5rem, 8vw, 6.5rem)) 0 clamp(7rem, 13vw, 10rem);
    color: var(--color-text-on-dark);
    background:
        radial-gradient(circle at 78% 30%, rgba(59, 130, 246, .22), transparent 32rem),
        linear-gradient(135deg, #0f172a 0%, #1b2a4a 52%, #1e3a5f 100%);
}

.calculator-hero::before {
    position: absolute;
    inset: 0;
    content: '';
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: linear-gradient(to bottom, #000, transparent);
}

.calculator-hero__inner {
    position: relative;
    z-index: 1;
    max-width: 850px;
    text-align: center;
}

.calculator-hero h1 {
    max-width: 800px;
    margin: 0 auto 1.5rem;
    color: #fff;
    font-size: clamp(2.25rem, 6vw, 4.25rem);
}

.calculator-hero p {
    max-width: 660px;
    margin: 0 auto;
    color: #cbd5e1;
    font-size: clamp(1.0625rem, 2vw, 1.25rem);
}

.calculator-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    margin-bottom: 1rem;
    padding: .4rem .8rem;
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 999px;
    background: rgba(255, 255, 255, .06);
    color: #93c5fd;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
}

.calculator-eyebrow--blue {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--color-accent);
}

.calculator-section {
    position: relative;
    z-index: 2;
    padding: 0 0 clamp(4rem, 8vw, 7rem);
    background: var(--color-bg-light);
}

.calculator-shell {
    margin-top: -5.5rem;
}

.calculator-intro {
    display: flex;
    align-items: center;
    gap: 1rem;
    max-width: 1080px;
    margin: 0 auto 1.25rem;
    padding: 1.5rem clamp(1.25rem, 4vw, 2rem);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    background: #fff;
    box-shadow: var(--shadow-md);
}

.calculator-intro h2 {
    margin: 0 0 .25rem;
    font-size: clamp(1.375rem, 3vw, 1.75rem);
}

.calculator-intro p {
    margin: 0;
    color: var(--color-text-muted);
}

.calculator-step {
    display: inline-flex;
    flex: 0 0 2.5rem;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    font-size: 1rem;
    font-weight: 800;
}

.calculator-step--light {
    background: rgba(255, 255, 255, .12);
}

.calculator-grid {
    display: grid;
    max-width: 1080px;
    margin: 0 auto;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    background: #fff;
    box-shadow: var(--shadow-xl);
}

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: clamp(1.5rem, 4vw, 2.5rem);
}

.calculator-field label {
    display: block;
    margin-bottom: .3rem;
    color: var(--color-text);
    font-weight: 700;
    line-height: 1.4;
}

.calculator-field__help {
    margin: 0 0 .65rem;
    color: var(--color-text-muted);
    font-size: .8125rem;
    line-height: 1.5;
}

.calculator-input-wrap {
    position: relative;
}

.calculator-input-wrap input {
    width: 100%;
    min-height: 3.5rem;
    padding: .8rem 4rem .8rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-sm);
    outline: none;
    background: #fff;
    color: var(--color-text);
    font: inherit;
    font-size: 1.125rem;
    font-weight: 700;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    appearance: textfield;
}

.calculator-input-wrap input::-webkit-inner-spin-button,
.calculator-input-wrap input::-webkit-outer-spin-button {
    margin: 0;
    appearance: none;
}

.calculator-input-wrap input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .14);
}

.calculator-input-wrap input[aria-invalid="true"] {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, .1);
}

.calculator-input-wrap span {
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-weight: 600;
    pointer-events: none;
}

.calculator-error {
    display: block;
    min-height: 1.25rem;
    margin-top: .25rem;
    color: #b91c1c;
    font-size: .75rem;
}

.calculator-submit {
    margin-top: .25rem;
}

.calculator-results {
    padding: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--color-text-on-dark);
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, .28), transparent 21rem),
        linear-gradient(145deg, #172033, #0f172a);
}

.calculator-results__header {
    display: flex;
    align-items: center;
    gap: .9rem;
    margin-bottom: 1.5rem;
}

.calculator-results__header h2 {
    margin: 0;
    color: #fff;
    font-size: clamp(1.375rem, 3vw, 1.75rem);
}

.calculator-results__eyebrow {
    margin: 0 0 .15rem;
    color: #93c5fd;
    font-size: .6875rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.calculator-output {
    display: grid;
    gap: 1rem;
}

.result-period {
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, .1);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, .055);
}

.result-period--first {
    border-color: rgba(59, 130, 246, .34);
}

.result-period__heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .8rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.result-period__heading h3 {
    margin: 0;
    color: #fff;
    font-size: 1rem;
}

.result-period__heading span {
    color: var(--color-text-on-dark-muted);
    font-size: .75rem;
}

.result-metrics {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.result-metrics div {
    padding: 1rem;
}

.result-metrics div:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(255, 255, 255, .08);
}

.result-metrics dt {
    min-height: 2.4em;
    color: var(--color-text-on-dark-muted);
    font-size: .6875rem;
    line-height: 1.3;
}

.result-metrics dd {
    margin-top: .3rem;
    color: #fff;
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 800;
    line-height: 1.1;
}

.result-metrics div:last-child dd {
    color: #86efac;
    font-size: clamp(1.25rem, 3vw, 1.55rem);
}

.calculator-summary {
    margin: 1rem 0 0;
    padding: .8rem 1rem;
    border: 1px solid rgba(96, 165, 250, .35);
    border-radius: var(--radius-sm);
    background: rgba(37, 99, 235, .12);
    color: #dbeafe;
    font-size: .8125rem;
    line-height: 1.55;
}

.calculator-summary:empty {
    display: none;
}

.calculator-invalid {
    margin-top: 1rem;
    padding: .8rem 1rem;
    border: 1px solid rgba(248, 113, 113, .35);
    border-radius: var(--radius-sm);
    background: rgba(239, 68, 68, .1);
    color: #fecaca;
    font-size: .8125rem;
}

.calculator-next {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, .1);
}

.calculator-next h3 {
    margin-bottom: .5rem;
    color: #fff;
    font-size: 1.0625rem;
}

.calculator-next p {
    margin-bottom: 1rem;
    color: var(--color-text-on-dark-muted);
    font-size: .875rem;
}

.calculator-next > span {
    display: block;
    margin-top: .65rem;
    color: var(--color-text-on-dark-muted);
    font-size: .6875rem;
    text-align: center;
}

.calculator-method {
    padding: clamp(3.5rem, 8vw, 6rem) 0;
    background: #fff;
}

.calculator-method__grid {
    display: grid;
    gap: 2rem;
    max-width: 1000px;
}

.calculator-method h2 {
    margin-bottom: 1.25rem;
}

.calculator-method p {
    color: var(--color-text-muted);
}

.calculator-caveat {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: clamp(1.25rem, 4vw, 2rem);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-lg);
    background: #eff6ff;
}

.calculator-caveat > i {
    flex: 0 0 auto;
    width: 1.5rem;
    height: 1.5rem;
    color: var(--color-accent);
}

.calculator-caveat h3 {
    margin: 0 0 .5rem;
    font-size: 1rem;
}

.calculator-caveat p {
    margin: 0;
    font-size: .875rem;
}

@media (min-width: 840px) {
    .calculator-grid {
        grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    }

    .calculator-results {
        min-width: 0;
    }

    .calculator-method__grid {
        grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
        align-items: center;
    }
}

@media (max-width: 520px) {
    .calculator-hero {
        padding-bottom: 7rem;
    }

    .calculator-shell {
        margin-top: -4.75rem;
        padding-right: .75rem;
        padding-left: .75rem;
    }

    .calculator-intro {
        align-items: flex-start;
        padding: 1.25rem;
    }

    .calculator-form,
    .calculator-results {
        padding: 1.25rem;
    }

    .calculator-submit,
    .calculator-next .btn {
        padding-right: 1rem;
        padding-left: 1rem;
        font-size: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .calculator-input-wrap input,
    .calculator-submit {
        transition: none;
    }
}

@media print {
    .calculator-hero {
        padding: 2rem 0;
        color: #000;
        background: #fff;
    }

    .calculator-hero h1,
    .calculator-hero p {
        color: #000;
    }

    .calculator-section {
        padding: 0;
        background: #fff;
    }

    .calculator-shell {
        margin-top: 0;
    }

    .calculator-form,
    .calculator-intro,
    .calculator-next,
    .calculator-method {
        display: none;
    }

    .calculator-grid {
        display: block;
        border: 0;
    }
}