:root {
    --rr-ink: #14223a;
    --rr-ink-muted: #5f6d82;
    --rr-line: #dce4ef;
    --rr-paper: #ffffff;
    --rr-soft: #f5f8fc;
    --rr-blue: #1f5eaa;
    --rr-blue-dark: #174a86;
    --rr-blue-soft: #eaf3ff;
    --rr-green: #13785a;
    --rr-gold: #a06011;
    --rr-shadow: 0 18px 44px rgba(22, 44, 76, 0.10);
}

* { box-sizing: border-box; }

body.roof-rafter-body {
    margin: 0;
    color: var(--rr-ink);
    background: #f6f8fb;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.roof-rafter-page { min-height: 100vh; }

.rr-shell {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.rr-header {
    border-bottom: 1px solid rgba(20, 34, 58, .10);
    background: rgba(255,255,255,.96);
}

.rr-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
    min-height: 72px;
}

.rr-brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--rr-ink);
    text-decoration: none;
    font-weight: 800;
    letter-spacing: -.02em;
}

.rr-brand-mark {
    display: grid;
    place-items: center;
    width: 31px;
    height: 31px;
    border-radius: 9px;
    background: var(--rr-blue);
    color: white;
    font-size: 15px;
    box-shadow: 0 6px 14px rgba(31, 94, 170, .24);
}

.rr-brand small {
    display: block;
    color: var(--rr-ink-muted);
    font-size: 11px;
    font-weight: 650;
    letter-spacing: .02em;
}

.rr-header-links { display: flex; gap: 18px; align-items: center; }
.rr-header-links a { color: var(--rr-ink-muted); text-decoration: none; font-weight: 650; font-size: 14px; }
.rr-header-links a:hover { color: var(--rr-blue); }

.rr-hero {
    padding: 60px 0 32px;
    background: linear-gradient(180deg, #fff 0%, #f6f9fd 100%);
    border-bottom: 1px solid rgba(20, 34, 58, .08);
}

.rr-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 12px;
    color: var(--rr-blue);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .09em;
    text-transform: uppercase;
}
.rr-eyebrow::before { content: ""; width: 26px; height: 2px; background: currentColor; }

.rr-hero h1, .rr-seo h2, .rr-results-heading h2, .rr-layout-header h2, .rr-materials h2 {
    margin: 0;
    letter-spacing: -.045em;
}

.rr-hero h1 { max-width: 760px; font-size: clamp(36px, 5vw, 58px); line-height: 1.02; }
.rr-hero p:not(.rr-eyebrow) { max-width: 720px; margin: 18px 0 0; color: var(--rr-ink-muted); font-size: 18px; line-height: 1.6; }

.rr-tool-section { padding: 34px 0 52px; }
.rr-tool-grid { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr); gap: 24px; align-items: start; }

.rr-panel {
    border: 1px solid var(--rr-line);
    border-radius: 20px;
    background: var(--rr-paper);
    box-shadow: var(--rr-shadow);
}
.rr-form-panel { padding: 25px; }
.rr-panel-heading { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; margin-bottom: 22px; }
.rr-panel-heading h2 { margin: 0; font-size: 22px; letter-spacing: -.03em; }
.rr-panel-heading p { max-width: 320px; margin: 6px 0 0; color: var(--rr-ink-muted); font-size: 14px; line-height: 1.45; }

.rr-form-section { padding: 20px 0; border-top: 1px solid var(--rr-line); }
.rr-form-section:first-of-type { padding-top: 0; border-top: 0; }
.rr-form-section h3 { margin: 0 0 15px; font-size: 14px; letter-spacing: .04em; text-transform: uppercase; color: var(--rr-ink-muted); }
.rr-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.rr-field { min-width: 0; }
.rr-field.rr-field-full { grid-column: 1 / -1; }
.rr-field label, .rr-group-label { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; color: #293a54; font-size: 13px; font-weight: 760; }
.rr-field-note { display: block; margin-top: 7px; color: var(--rr-ink-muted); font-size: 12px; line-height: 1.45; }
.rr-tooltip { display: inline-grid; place-items: center; width: 16px; height: 16px; border: 1px solid #a4b2c5; border-radius: 50%; color: #64738a; cursor: help; font-size: 11px; font-weight: 800; }

.rr-select, .rr-input, .rr-unit-pair input {
    width: 100%;
    min-height: 42px;
    border: 1px solid #cbd7e7;
    border-radius: 10px;
    background: white;
    color: var(--rr-ink);
    font: inherit;
    font-size: 15px;
    outline: 0;
    transition: border-color .16s ease, box-shadow .16s ease;
}
.rr-select, .rr-input { padding: 0 12px; }
.rr-select:focus, .rr-input:focus, .rr-unit-pair input:focus { border-color: var(--rr-blue); box-shadow: 0 0 0 3px rgba(31, 94, 170, .13); }
.rr-select:disabled { color: #8995a8; background: #f1f4f8; cursor: not-allowed; }

.rr-unit-pair { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, .78fr) auto; align-items: center; gap: 7px; }
.rr-unit-pair.rr-single-unit { grid-template-columns: minmax(0, 1fr) auto; }
.rr-unit-pair input { padding: 0 10px; text-align: right; }
.rr-unit-pair span { color: var(--rr-ink-muted); font-size: 13px; font-weight: 750; }

.rr-inline-toggle { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; padding: 4px; border-radius: 11px; background: #eef3f8; }
.rr-inline-toggle button { min-height: 35px; border: 0; border-radius: 8px; background: transparent; color: var(--rr-ink-muted); font: inherit; font-size: 13px; font-weight: 760; cursor: pointer; }
.rr-inline-toggle button.is-active { background: white; color: var(--rr-blue-dark); box-shadow: 0 2px 7px rgba(37, 56, 85, .10); }

.rr-segmented { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 7px; }
.rr-segmented label { display: flex; align-items: center; justify-content: center; min-height: 42px; padding: 8px; border: 1px solid #cbd7e7; border-radius: 10px; color: var(--rr-ink-muted); font-size: 12px; font-weight: 760; cursor: pointer; text-align: center; }
.rr-segmented input { position: absolute; opacity: 0; pointer-events: none; }
.rr-segmented label:has(input:checked) { border-color: var(--rr-blue); background: var(--rr-blue-soft); color: var(--rr-blue-dark); }
.rr-custom-spacing { margin-top: 9px; }

.rr-calculate-button, .rr-action-button, .rr-outline-button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 47px;
    padding: 0 17px;
    border: 1px solid transparent;
    border-radius: 11px;
    font: inherit;
    font-size: 14px;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
    transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
}
.rr-calculate-button { width: 100%; margin-top: 2px; background: var(--rr-blue); color: white; box-shadow: 0 9px 18px rgba(31, 94, 170, .20); }
.rr-calculate-button:hover, .rr-action-button:hover { background: var(--rr-blue-dark); transform: translateY(-1px); }
.rr-action-button { background: var(--rr-blue); color: white; }
.rr-outline-button { border-color: #b9c8da; background: #fff; color: var(--rr-blue-dark); }
.rr-outline-button:hover { border-color: var(--rr-blue); background: var(--rr-blue-soft); }
.rr-outline-button:disabled { cursor: not-allowed; opacity: .65; }

.rr-results-panel { overflow: hidden; }
.rr-results-heading { padding: 24px 25px 18px; border-bottom: 1px solid var(--rr-line); background: linear-gradient(135deg, #f7fbff, #fff); }
.rr-results-heading h2 { font-size: 23px; }
.rr-result-lead { margin: 11px 0 0; color: var(--rr-ink-muted); font-size: 14px; line-height: 1.5; }
.rr-result-lead strong { color: var(--rr-blue-dark); font-size: 17px; }
.rr-results-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--rr-line); border-bottom: 1px solid var(--rr-line); }
.rr-result { min-height: 86px; padding: 15px 17px; background: white; }
.rr-result-label { color: var(--rr-ink-muted); font-size: 12px; font-weight: 700; line-height: 1.35; }
.rr-result-value { margin-top: 7px; color: var(--rr-ink); font-size: 16px; font-weight: 830; letter-spacing: -.02em; line-height: 1.22; }
.rr-result-value.rr-value-primary { color: var(--rr-blue-dark); font-size: 21px; }
.rr-result-detail { margin-top: 5px; color: var(--rr-ink-muted); font-size: 11px; line-height: 1.35; }
.rr-disclaimer { padding: 16px 25px; margin: 0; color: var(--rr-ink-muted); background: #fbfcfe; font-size: 12px; line-height: 1.5; }

.rr-account-cta { margin-top: 18px; padding: 21px 22px; border: 1px solid #c8ddf4; border-radius: 16px; background: linear-gradient(135deg, #f0f7ff, #fbfdff); }
.rr-account-cta h3 { margin: 0; font-size: 18px; letter-spacing: -.025em; }
.rr-account-cta p { margin: 7px 0 15px; color: var(--rr-ink-muted); font-size: 14px; line-height: 1.48; }
.rr-account-cta .rr-action-button { min-height: 42px; }

.rr-layout-section { padding: 10px 0 8px; }
.rr-layout-header { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin: 0 0 18px; }
.rr-layout-header h2 { font-size: 27px; }
.rr-layout-header p { max-width: 580px; margin: 7px 0 0; color: var(--rr-ink-muted); font-size: 14px; line-height: 1.5; }
.rr-layout-card { overflow: hidden; border: 1px solid var(--rr-line); border-radius: 20px; background: white; box-shadow: var(--rr-shadow); }
.rr-svg-stage { padding: 10px; background: #fbfdff; }
.rr-svg-stage svg { display: block; width: 100%; height: auto; min-height: 315px; }
.rr-layout-actions { display: flex; flex-wrap: wrap; gap: 10px; padding: 16px; border-top: 1px solid var(--rr-line); }
.rr-pro-badge { margin-left: 6px; padding: 3px 6px; border-radius: 999px; background: #eef1f5; color: #647087; font-size: 10px; letter-spacing: .04em; text-transform: uppercase; }

.rr-materials { margin-top: 26px; padding: 25px; }
.rr-materials h2 { font-size: 25px; }
.rr-materials-intro { margin: 9px 0 18px; color: var(--rr-ink-muted); font-size: 14px; }
.rr-table-wrap { overflow-x: auto; border: 1px solid var(--rr-line); border-radius: 12px; }
.rr-table { width: 100%; min-width: 650px; border-collapse: collapse; background: #fff; font-size: 14px; }
.rr-table th, .rr-table td { padding: 13px 14px; text-align: left; border-bottom: 1px solid var(--rr-line); }
.rr-table th { color: var(--rr-ink-muted); background: #f7f9fc; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.rr-table tr:last-child td { border-bottom: 0; }
.rr-table td:first-child { font-weight: 780; }
.rr-material-note { margin: 15px 0 0; color: var(--rr-ink-muted); font-size: 12px; line-height: 1.5; }

.rr-seo { padding: 62px 0 72px; }
.rr-seo-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.rr-seo-card { padding: 25px; border: 1px solid var(--rr-line); border-radius: 18px; background: white; }
.rr-seo-card.rr-seo-card-wide { grid-column: 1 / -1; }
.rr-seo h2 { font-size: 25px; }
.rr-seo p, .rr-seo li { color: var(--rr-ink-muted); font-size: 14px; line-height: 1.6; }
.rr-seo p { margin: 11px 0 0; }
.rr-faq { margin: 15px 0 0; }
.rr-faq details { border-top: 1px solid var(--rr-line); }
.rr-faq details:first-child { border-top: 0; }
.rr-faq summary { padding: 15px 0; cursor: pointer; color: var(--rr-ink); font-size: 15px; font-weight: 780; }
.rr-faq details p { margin: 0 0 16px; }

.rr-footer { border-top: 1px solid rgba(20, 34, 58, .10); background: #101d31; color: #eaf1fb; }
.rr-footer-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(160px, .75fr)); gap: 32px; padding: 45px 0; }
.rr-footer p { margin: 13px 0 0; color: #b9c7da; font-size: 13px; line-height: 1.58; }
.rr-footer a { color: #dceaff; text-decoration: none; }
.rr-footer a:hover { color: white; }
.rr-footer h3 { margin: 0 0 14px; color: #fff; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
.rr-footer-links { display: grid; gap: 10px; font-size: 14px; }

.rr-toast { position: fixed; z-index: 20; left: 50%; bottom: 22px; max-width: calc(100% - 32px); padding: 11px 15px; border-radius: 10px; background: #11213a; color: white; box-shadow: 0 12px 28px rgba(13, 27, 48, .26); font-size: 13px; font-weight: 650; transform: translate(-50%, 130%); opacity: 0; transition: transform .2s ease, opacity .2s ease; }
.rr-toast.is-visible { transform: translate(-50%, 0); opacity: 1; }

.rr-hidden { display: none !important; }

.rr-drawing .rr-line { stroke: #213854; stroke-width: 2.4; fill: none; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-wall { stroke: #213854; stroke-width: 7; fill: none; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-rafter { stroke: #1f5eaa; stroke-width: 5; fill: none; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-ridge { stroke: #a06011; stroke-width: 7; fill: none; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-dim { stroke: #70839c; stroke-width: 1.25; fill: none; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-ext { stroke: #aab7c8; stroke-width: 1; fill: none; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-bird { fill: #eaf3ff; stroke: #1f5eaa; stroke-width: 2; vector-effect: non-scaling-stroke; }
.rr-drawing .rr-label { fill: #344761; font-size: 15px; font-family: Inter, ui-sans-serif, system-ui, sans-serif; font-weight: 700; }
.rr-drawing .rr-label-small { fill: #5f7088; font-size: 12px; font-family: Inter, ui-sans-serif, system-ui, sans-serif; font-weight: 650; }
.rr-drawing .rr-accent-label { fill: #1f5eaa; font-size: 14px; font-family: Inter, ui-sans-serif, system-ui, sans-serif; font-weight: 780; }
.rr-drawing .rr-grid { stroke: #e8edf4; stroke-width: 1; }

.rr-landing {
    padding: 76px 0;
    min-height: calc(100vh - 72px - 250px);
    background: radial-gradient(circle at 88% 3%, #e2f0ff 0, rgba(226,240,255,0) 31%), #f7f9fc;
}
.rr-landing-card { max-width: 820px; padding: 47px; border: 1px solid var(--rr-line); border-radius: 24px; background: white; box-shadow: var(--rr-shadow); }
.rr-landing-card h1 { margin: 0; font-size: clamp(40px, 6vw, 64px); letter-spacing: -.05em; line-height: 1.02; }
.rr-landing-card p { max-width: 640px; margin: 18px 0 0; color: var(--rr-ink-muted); font-size: 18px; line-height: 1.58; }
.rr-landing-points { display: flex; flex-wrap: wrap; gap: 9px; margin: 24px 0 29px; padding: 0; list-style: none; }
.rr-landing-points li { padding: 7px 11px; border-radius: 999px; background: var(--rr-soft); color: #465a73; font-size: 13px; font-weight: 720; }

@media (max-width: 900px) {
    .rr-tool-grid { grid-template-columns: 1fr; }
    .rr-results-panel { order: -1; }
    .rr-footer-grid { grid-template-columns: 1fr 1fr; }
    .rr-footer-grid > :first-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
    .rr-shell { width: min(100% - 28px, 1180px); }
    .rr-header-row { min-height: 62px; }
    .rr-header-links { display: none; }
    .rr-hero { padding: 42px 0 25px; }
    .rr-hero p:not(.rr-eyebrow) { font-size: 16px; }
    .rr-tool-section { padding-top: 22px; }
    .rr-form-panel, .rr-materials { padding: 19px; }
    .rr-fields { grid-template-columns: 1fr; }
    .rr-field.rr-field-full { grid-column: auto; }
    .rr-results-heading { padding: 20px; }
    .rr-results-grid { grid-template-columns: 1fr 1fr; }
    .rr-result { min-height: 82px; padding: 13px; }
    .rr-result-value { font-size: 14px; }
    .rr-result-value.rr-value-primary { font-size: 18px; }
    .rr-disclaimer { padding: 14px 18px; }
    .rr-layout-header { display: block; }
    .rr-layout-header h2 { font-size: 24px; }
    .rr-layout-actions { display: grid; grid-template-columns: 1fr; }
    .rr-layout-actions button { width: 100%; }
    .rr-seo { padding: 44px 0 54px; }
    .rr-seo-grid { grid-template-columns: 1fr; }
    .rr-seo-card.rr-seo-card-wide { grid-column: auto; }
    .rr-footer-grid { grid-template-columns: 1fr; gap: 27px; }
    .rr-footer-grid > :first-child { grid-column: auto; }
    .rr-landing { padding: 40px 0; }
    .rr-landing-card { padding: 28px 22px; }
}

@media print {
    body.roof-rafter-body { background: white; }
    .rr-header, .rr-hero, .rr-form-panel, .rr-account-cta, .rr-layout-actions, .rr-seo, .rr-footer, .rr-toast { display: none !important; }
    .rr-tool-section { padding: 0; }
    .rr-shell { width: 100%; }
    .rr-tool-grid { display: block; }
    .rr-results-panel, .rr-layout-card, .rr-materials { box-shadow: none; border-color: #aebaca; break-inside: avoid; }
    .rr-results-panel { margin-bottom: 18px; }
    .rr-layout-section { padding-top: 0; }
    .rr-layout-header { margin-top: 15px; }
    .rr-materials { margin-top: 18px; }
}