:root {
    --police-blue: #003c7e;
    --police-blue-dark: #002855;
    --police-blue-soft: #eaf2fa;
    --ink: #101820;
    --muted: #596675;
    --line: #d9e0e7;
    --panel: #f5f7f9;
    --success: #1d6b45;
    --warning: #8a5300;
    --danger: #a21d28;
}

.calculator-layout {
    max-width: 1280px;
}

.calculator-article {
    max-width: none;
    overflow: hidden;
}

.calculator-hero > div:first-child,
.form-section__body,
.form-field,
.input-with-unit,
.input-with-fixed-unit,
.evidence-row__select,
.evidence-row__mass {
    min-width: 0;
}

.calculator-hero {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    padding: 42px 46px 36px;
    color: #fff;
    background:
        linear-gradient(115deg, rgba(0, 40, 85, 0.98), rgba(0, 60, 126, 0.91)),
        repeating-linear-gradient(135deg, transparent 0 14px, rgba(255,255,255,.05) 14px 15px);
}

.calculator-hero h1 {
    margin: 3px 0 12px;
    font-size: clamp(2rem, 4vw, 3.25rem);
    line-height: 1.08;
    letter-spacing: -0.045em;
}

.calculator-lead {
    max-width: 820px;
    margin: 0;
    color: #dbeafe;
    font-size: 1.08rem;
    line-height: 1.6;
}

.calculator-kicker {
    margin: 0;
    color: #79b8ff;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    overflow-wrap: anywhere;
}

.calculator-hero__mark {
    align-self: center;
    width: 112px;
    height: 112px;
    border: 1px solid rgba(255,255,255,.28);
    border-radius: 50%;
    color: #fff;
    font-size: 4.4rem;
    line-height: 93px;
    text-align: center;
    transform: rotate(-10deg);
    opacity: .82;
}

.calculator-breadcrumb {
    display: flex;
    gap: 9px;
    align-items: center;
    padding: 13px 46px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    color: var(--muted);
    font-size: .82rem;
}

.calculator-breadcrumb a {
    color: var(--police-blue);
}

.calculator-alert {
    margin: 28px 46px 0;
    padding: 19px 22px;
    border-left: 4px solid;
    border-radius: 2px 7px 7px 2px;
    font-size: .94rem;
}

.calculator-alert strong {
    display: block;
    margin-bottom: 4px;
    font-size: .98rem;
}

.calculator-alert p {
    margin: 0;
    line-height: 1.68;
}

.calculator-alert--info {
    border-color: var(--police-blue);
    background: var(--police-blue-soft);
    color: #17324f;
}

.calculator-alert--warning {
    border-color: #d88b00;
    background: #fff7e5;
    color: #5f3b00;
}

.calculator-alert--error {
    border-color: var(--danger);
    background: #fff0f1;
    color: #74121a;
}

.chain-form {
    padding: 12px 46px 46px;
}

.form-section {
    display: grid;
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 23px;
    padding: 34px 0;
    border-bottom: 1px solid var(--line);
}

.form-section__number {
    display: grid;
    place-items: center;
    align-self: start;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--police-blue);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
}

.form-section__heading {
    margin-bottom: 22px;
}

.form-section__heading h2 {
    margin: 0 0 3px;
    color: var(--ink);
    font-size: 1.32rem;
}

.form-section__heading p {
    margin: 0;
    color: var(--muted);
    font-size: .9rem;
}

.form-grid {
    display: grid;
    gap: 22px;
}

.form-grid--3 {
    grid-template-columns: minmax(270px, 1.55fr) minmax(190px, .7fr) minmax(230px, .8fr);
}

.form-field label,
.range-field label {
    display: block;
    margin: 0 0 7px;
    color: #243140;
    font-size: .83rem;
    font-weight: 700;
}

.form-field input,
.form-field select {
    width: 100%;
    min-width: 0;
    min-height: 44px;
    padding: 9px 11px;
    border: 1px solid #aeb9c4;
    border-radius: 4px;
    background: #fff;
    color: var(--ink);
    font: inherit;
    font-size: .92rem;
}

.form-field input:focus,
.form-field select:focus,
.range-field input:focus {
    outline: 3px solid rgba(0, 94, 184, .18);
    border-color: var(--police-blue);
}

.help-text {
    margin: 7px 0 0;
    color: var(--muted);
    font-size: .77rem;
    line-height: 1.45;
}

.input-with-unit {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 74px;
}

.input-with-unit input {
    border-radius: 4px 0 0 4px;
}

.input-with-unit select {
    border-left: 0;
    border-radius: 0 4px 4px 0;
    background: #f1f4f7;
    font-weight: 700;
}

.input-with-fixed-unit {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 52px;
}

.input-with-fixed-unit input {
    border-radius: 4px 0 0 4px;
}

.input-with-fixed-unit span {
    display: grid;
    place-items: center;
    border: 1px solid #aeb9c4;
    border-left: 0;
    border-radius: 0 4px 4px 0;
    background: #f1f4f7;
    font-size: .84rem;
    font-weight: 700;
}

.gross-fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 260px));
    gap: 22px;
    margin-top: 22px;
    padding: 18px;
    border: 1px dashed #afbbc7;
    border-radius: 6px;
    background: var(--panel);
}

.gross-fields[hidden] {
    display: none;
}

.purity-panel {
    max-width: 820px;
    padding: 20px 23px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--panel);
}

.purity-scale {
    display: flex;
    justify-content: space-between;
    color: #7a8794;
    font-size: .7rem;
}

.range-field + .range-field {
    margin-top: 18px;
}

.range-field output {
    color: var(--police-blue);
    font-weight: 700;
}

.range-field input[type="range"] {
    width: 100%;
    accent-color: var(--police-blue);
}

.purity-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.evidence-list {
    display: grid;
    gap: 10px;
}

.evidence-row {
    display: grid;
    grid-template-columns: 38px minmax(280px, 1.35fr) minmax(230px, .65fr);
    gap: 16px;
    align-items: end;
    padding: 15px 18px;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: #fff;
}

.evidence-row__index {
    display: grid;
    place-items: center;
    align-self: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #e6edf4;
    color: #33465a;
    font-size: .76rem;
    font-weight: 700;
}

.evidence-row__mass.is-disabled {
    opacity: .43;
}

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    padding: 30px 0 0 77px;
}

.form-actions p {
    flex-basis: 100%;
    margin: 2px 0 0;
    color: var(--muted);
    font-size: .76rem;
}

.button {
    display: inline-flex;
    min-height: 42px;
    padding: 9px 17px;
    border: 1px solid transparent;
    border-radius: 4px;
    align-items: center;
    justify-content: center;
    font: inherit;
    font-size: .86rem;
    font-weight: 700;
    line-height: 1.25;
    text-decoration: none;
    cursor: pointer;
}

.button--primary {
    border-color: var(--police-blue);
    background: var(--police-blue);
    color: #fff;
}

.button--primary:hover,
.button--primary:focus {
    background: var(--police-blue-dark);
}

.button--secondary {
    border-color: #b4bec8;
    background: #fff;
    color: #26384a;
}

.button--secondary:hover,
.button--secondary:focus {
    border-color: #718090;
    background: #f3f6f8;
}

.results {
    padding: 45px 46px 50px;
    border-top: 8px solid var(--police-blue);
    background: #f3f6f8;
}

.results-heading {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: end;
    margin-bottom: 24px;
}

.results-heading h2 {
    margin: 4px 0 0;
    color: var(--ink);
    font-size: clamp(1.7rem, 3vw, 2.4rem);
    letter-spacing: -.035em;
}

.mass-summary {
    display: grid;
    grid-template-columns: 1fr 34px 1fr 34px 1.15fr;
    align-items: stretch;
    margin-bottom: 22px;
}

.mass-summary__item {
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: #fff;
}

.mass-summary__item span,
.mass-summary__item small {
    display: block;
    color: var(--muted);
    font-size: .73rem;
    line-height: 1.4;
}

.mass-summary__item strong {
    display: block;
    margin: 3px 0;
    color: var(--ink);
    font-size: 1.35rem;
    line-height: 1.25;
}

.mass-summary__item--accent {
    border-color: var(--police-blue);
    background: var(--police-blue-soft);
}

.mass-summary__arrow {
    display: grid;
    place-items: center;
    color: #8291a0;
    font-size: 1.3rem;
}

.interpretation-note,
.method-note,
.sources-panel,
.field-checklist {
    margin-top: 22px;
    padding: 20px 22px;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: #fff;
}

.interpretation-note strong,
.interpretation-note p {
    display: inline;
}

.interpretation-note p {
    margin-left: 8px;
    color: var(--muted);
    font-size: .86rem;
}

.scenario-list {
    display: grid;
    gap: 22px;
    margin-top: 22px;
}

.scenario-card {
    overflow: hidden;
    border: 1px solid #cbd4dd;
    border-radius: 7px;
    background: #fff;
    box-shadow: 0 5px 18px rgba(22, 40, 58, .06);
}

.scenario-card__header {
    display: grid;
    grid-template-columns: 70px minmax(0, 1fr) 205px;
    gap: 18px;
    align-items: center;
    padding: 21px 23px;
    border-bottom: 1px solid var(--line);
}

.scenario-card__rank {
    color: #a5b0bb;
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -.06em;
}

.scenario-card__title h3 {
    margin: 0 0 3px;
    color: var(--ink);
    font-size: 1.23rem;
}

.scenario-card__title p {
    margin: 0;
    color: var(--muted);
    font-size: .82rem;
    line-height: 1.5;
}

.score-meter {
    text-align: right;
}

.score-meter strong,
.score-meter span {
    display: block;
}

.score-meter strong {
    color: var(--police-blue);
    font-size: 1.35rem;
}

.score-meter span {
    color: var(--muted);
    font-size: .7rem;
}

.score-meter__bar {
    height: 5px;
    margin-top: 7px;
    overflow: hidden;
    border-radius: 3px;
    background: #dce3ea;
}

.score-meter__bar i {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--police-blue);
}

.scenario-danger {
    padding: 14px 23px;
    border-bottom: 1px solid #efc7ca;
    background: #fff1f2;
    color: #75141c;
    font-size: .84rem;
    font-weight: 700;
    line-height: 1.55;
}

.evidence-summary {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    padding: 17px 23px;
    border-bottom: 1px solid var(--line);
    background: #fbfcfd;
    font-size: .79rem;
}

.evidence-summary strong {
    display: block;
    margin-bottom: 3px;
}

.evidence-summary p {
    margin: 0;
    color: var(--muted);
}

.precursor-table-wrap {
    padding: 0 23px 23px;
    overflow-x: auto;
}

.scenario-section-title {
    margin: 21px 23px 12px;
    color: #33465a;
    font-size: .76rem;
    letter-spacing: .07em;
    text-transform: uppercase;
}

.precursor-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .81rem;
}

.precursor-table th,
.precursor-table td {
    padding: 11px 10px;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
    text-align: left;
}

.precursor-table th {
    color: #4b5d70;
    background: #f3f6f8;
    font-size: .7rem;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.precursor-table td strong,
.precursor-table td small {
    display: block;
}

.precursor-link {
    color: var(--police-blue);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

.precursor-link:hover,
.precursor-link:focus {
    color: var(--police-blue-dark);
}

.precursor-table td small {
    margin-top: 3px;
    color: var(--muted);
    line-height: 1.45;
}

.package-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.package-chip {
    padding: 3px 7px;
    border: 1px solid #c9d4df;
    border-radius: 12px;
    background: #f3f7fb;
    color: #28445f;
    font-size: .7rem;
    white-space: nowrap;
}

.scenario-columns {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    border-top: 1px solid var(--line);
    background: var(--line);
}

.scenario-column {
    padding: 20px 22px;
    background: #fff;
}

.scenario-column h4 {
    margin: 0 0 10px;
    color: #2a3d50;
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .055em;
}

.scenario-column ul {
    margin: 0;
    padding-left: 18px;
}

.scenario-column li {
    margin-bottom: 7px;
    color: #35475a;
    font-size: .79rem;
    line-height: 1.5;
}

.legal-context {
    padding: 15px 23px;
    border-top: 1px solid var(--line);
    background: #f8fafb;
    color: #536171;
    font-size: .78rem;
    line-height: 1.55;
}

.legal-context strong {
    color: #273a4c;
}

.article-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0 23px 20px;
}

.article-links a {
    color: var(--police-blue);
    font-size: .76rem;
    font-weight: 700;
}

.field-checklist h3,
.method-note h3,
.sources-panel h3 {
    margin: 0 0 12px;
    font-size: 1rem;
}

.checklist-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 20px;
}

.checklist-grid label {
    color: #34475a;
    font-size: .79rem;
}

.checklist-grid input {
    margin-right: 8px;
    accent-color: var(--police-blue);
}

.method-note p,
.sources-panel li {
    color: var(--muted);
    font-size: .79rem;
    line-height: 1.55;
}

.method-note p {
    margin: 7px 0 0;
}

.sources-panel ol {
    margin: 0;
    padding-left: 20px;
}

.sources-panel a {
    color: var(--police-blue);
}

@media (max-width: 900px) {
    .form-grid--3,
    .evidence-row,
    .scenario-card__header,
    .scenario-columns {
        grid-template-columns: 1fr;
    }

    .evidence-row__index,
    .scenario-card__rank {
        display: none;
    }

    .mass-summary {
        grid-template-columns: 1fr;
        gap: 7px;
    }

    .mass-summary__arrow {
        transform: rotate(90deg);
    }

    .score-meter {
        text-align: left;
    }

    .score-meter__bar {
        max-width: 260px;
    }
}

@media (max-width: 640px) {
    .calculator-hero,
    .chain-form,
    .results {
        padding-left: 20px;
        padding-right: 20px;
    }

    .calculator-breadcrumb,
    .calculator-alert {
        margin-left: 20px;
        margin-right: 20px;
    }

    .calculator-breadcrumb {
        padding-left: 0;
        padding-right: 0;
    }

    .calculator-hero__mark {
        display: none;
    }

    .calculator-hero {
        width: 100%;
    }

    .calculator-hero h1,
    .calculator-lead,
    .calculator-alert p {
        overflow-wrap: anywhere;
    }

    .form-section {
        grid-template-columns: 1fr;
    }

    .gross-fields,
    .evidence-summary,
    .checklist-grid {
        grid-template-columns: 1fr;
    }

    .form-actions {
        padding-left: 0;
    }

    .results-heading {
        align-items: start;
        flex-direction: column;
    }
}

@media print {
    .site-header,
    .site-footer,
    .chain-form,
    .calculator-alert,
    .calculator-breadcrumb,
    .print-button {
        display: none !important;
    }

    .calculator-hero {
        padding: 18px 0;
        color: #000;
        background: #fff;
    }

    .calculator-lead,
    .calculator-kicker {
        color: #333;
    }

    .results {
        padding: 15px 0;
        border-top: 2px solid #000;
        background: #fff;
    }

    .scenario-card {
        break-inside: avoid;
        box-shadow: none;
    }

    a {
        text-decoration: none;
    }
}