:root {
    --ri-bt-paper: #fffafc;
    --ri-bt-surface: #ffffff;
    --ri-bt-tint: #f5eaf0;
    --ri-bt-ink: #211a22;
    --ri-bt-copy: #3e3540;
    --ri-bt-muted: #6c626d;
    --ri-bt-line: #ddcdd5;
    --ri-bt-primary: #7e3154;
    --ri-bt-primary-dark: #632441;
    --ri-bt-sapphic: #8b365c;
    --ri-bt-mm: #315b76;
    --ri-bt-safe: #426f57;
    --ri-bt-caution: #8a5b22;
    --ri-bt-focus: #005fcc;
}

.ri-bt-page,
.ri-bt-page * { box-sizing: border-box; }
.ri-bt-page {
    background: var(--ri-bt-paper);
    color: var(--ri-bt-ink);
    font-family: "Schibsted Grotesk", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
.ri-bt-page a { color: var(--ri-bt-primary); text-underline-offset: 3px; }
.ri-bt-page a:focus-visible { outline: 3px solid var(--ri-bt-focus); outline-offset: 3px; }
.ri-bt-wrap { width: min(1200px, calc(100% - 48px)); margin-inline: auto; }
.ri-bt-hero { border-top: 5px solid var(--ri-bt-primary); border-bottom: 1px solid var(--ri-bt-line); background: linear-gradient(120deg, var(--ri-bt-surface), var(--ri-bt-tint)); }
.ri-bt-lane-sapphic .ri-bt-hero { border-top-color: var(--ri-bt-sapphic); }
.ri-bt-lane-mm-romance .ri-bt-hero { border-top-color: var(--ri-bt-mm); }
.ri-bt-hero-grid { min-height: 570px; padding-block: 64px; display: grid; grid-template-columns: minmax(0, 1fr) 350px; gap: 72px; align-items: center; }
.ri-bt-breadcrumbs { display: flex; gap: 9px; flex-wrap: wrap; color: var(--ri-bt-muted); font: 500 10px/1.5 "IBM Plex Mono", monospace; letter-spacing: .09em; text-transform: uppercase; }
.ri-bt-breadcrumbs a { color: inherit; text-decoration: none; }
.ri-bt-kicker,
.ri-bt-section-label { margin: 24px 0 9px; color: var(--ri-bt-primary); font: 500 11px/1.4 "IBM Plex Mono", monospace; letter-spacing: .12em; text-transform: uppercase; }
.ri-bt-hero h1 { max-width: 780px; margin: 0; font: 400 clamp(46px, 7vw, 78px)/1.01 "DM Serif Display", Georgia, serif; text-wrap: balance; }
.ri-bt-byline { margin: 14px 0 18px; color: var(--ri-bt-muted); font-size: 18px; }
.ri-bt-byline strong { color: var(--ri-bt-ink); font-weight: 600; }
.ri-bt-deck { max-width: 720px; margin: 24px 0; color: var(--ri-bt-copy); font-size: 19px; line-height: 1.65; text-wrap: pretty; }
.ri-bt-badges { display: flex; gap: 8px; flex-wrap: wrap; margin-block: 16px; }
.ri-bt-badges span { display: inline-flex; align-items: center; min-height: 31px; padding: 5px 10px; border: 1px solid var(--ri-bt-line); border-radius: 999px; background: var(--ri-bt-surface); color: var(--ri-bt-copy); font: 500 10px/1.2 "IBM Plex Mono", monospace; letter-spacing: .07em; text-transform: uppercase; }
.ri-bt-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin-top: 28px; }
.ri-bt-buy { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 13px 22px; border: 1px solid var(--ri-bt-primary); border-radius: 10px; background: var(--ri-bt-primary); color: #fff !important; font-weight: 600; text-decoration: none; transition: background .18s ease, border-color .18s ease, transform .18s ease; }
.ri-bt-buy:hover { border-color: var(--ri-bt-primary-dark); background: var(--ri-bt-primary-dark); transform: translateY(-1px); }
.ri-bt-text-link { font-weight: 600; }
.ri-bt-disclosure { max-width: 700px; margin: 24px 0 0; padding-top: 14px; border-top: 1px solid var(--ri-bt-line); color: var(--ri-bt-muted); font-size: 12.5px; }
.ri-bt-title-card { position: relative; min-height: 440px; padding: 34px; border: 1px solid var(--ri-bt-ink); border-radius: 14px; background: var(--ri-bt-surface); display: flex; flex-direction: column; justify-content: flex-end; overflow: hidden; box-shadow: 14px 14px 0 var(--ri-bt-tint); }
.ri-bt-title-card::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(45deg, transparent 0 14px, rgba(126,49,84,.035) 14px 28px); pointer-events: none; }
.ri-bt-title-card-mark { position: absolute; top: 30px; left: 30px; color: var(--ri-bt-primary); font: 400 82px/1 "DM Serif Display", Georgia, serif; opacity: .16; }
.ri-bt-title-card-lane { position: absolute; top: 28px; right: 26px; padding: 5px 9px; border: 1px solid currentColor; border-radius: 999px; color: var(--ri-bt-primary); font: 500 9px/1.2 "IBM Plex Mono", monospace; letter-spacing: .09em; text-transform: uppercase; }
.ri-bt-lane-sapphic .ri-bt-title-card-lane { color: var(--ri-bt-sapphic); }
.ri-bt-lane-mm-romance .ri-bt-title-card-lane { color: var(--ri-bt-mm); }
.ri-bt-title-card strong { position: relative; font: 400 37px/1.08 "DM Serif Display", Georgia, serif; text-wrap: balance; }
.ri-bt-title-card > span:not(.ri-bt-title-card-mark):not(.ri-bt-title-card-lane) { position: relative; margin-top: 10px; color: var(--ri-bt-muted); }
.ri-bt-title-card small { position: relative; margin-top: 28px; padding-top: 13px; border-top: 1px solid var(--ri-bt-line); color: var(--ri-bt-muted); font: 400 9px/1.4 "IBM Plex Mono", monospace; letter-spacing: .06em; text-transform: uppercase; }
.ri-bt-content-grid { padding-block: 72px 100px; display: grid; grid-template-columns: 250px minmax(0, 720px); gap: 72px; justify-content: center; align-items: start; }
.ri-bt-toc { position: sticky; top: 88px; border: 1px solid var(--ri-bt-line); border-radius: 14px; background: var(--ri-bt-surface); overflow: hidden; }
.ri-bt-toc strong { display: block; padding: 14px 18px; border-bottom: 1px solid var(--ri-bt-line); font-size: 13px; }
.ri-bt-toc a { display: block; min-height: 45px; padding: 11px 18px; border-left: 2px solid transparent; color: var(--ri-bt-copy); font-size: 14px; text-decoration: none; }
.ri-bt-toc a:hover { border-left-color: var(--ri-bt-primary); background: var(--ri-bt-tint); color: var(--ri-bt-primary); }
.ri-bt-section { padding-block: 12px 48px; scroll-margin-top: 32px; }
.ri-bt-section + .ri-bt-section { border-top: 1px solid var(--ri-bt-line); padding-top: 48px; }
.ri-bt-section-label { margin-top: 0; }
.ri-bt-article h2 { margin: 0 0 20px; font: 400 clamp(32px, 4vw, 42px)/1.12 "DM Serif Display", Georgia, serif; text-wrap: balance; }
.ri-bt-article h3 { font-size: 17px; line-height: 1.35; }
.ri-bt-article p { color: var(--ri-bt-copy); }
.ri-bt-article li { margin-block: .65em; }
.ri-bt-muted { color: var(--ri-bt-muted) !important; }
.ri-bt-evidence-strip { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--ri-bt-line); border-radius: 14px; background: var(--ri-bt-surface); overflow: hidden; }
.ri-bt-evidence-strip div { padding: 22px; }
.ri-bt-evidence-strip div + div { border-left: 1px solid var(--ri-bt-line); }
.ri-bt-evidence-strip strong { display: block; font: 400 35px/1 "DM Serif Display", Georgia, serif; color: var(--ri-bt-primary); }
.ri-bt-evidence-strip span { display: block; margin-top: 8px; color: var(--ri-bt-muted); font: 400 10px/1.4 "IBM Plex Mono", monospace; letter-spacing: .06em; text-transform: uppercase; }
.ri-bt-note { display: flex; gap: 16px; padding: 20px 22px; border: 1px solid var(--ri-bt-line); border-left: 4px solid var(--ri-bt-primary); border-radius: 14px; background: var(--ri-bt-surface); }
.ri-bt-note strong { flex: none; }
.ri-bt-note span { color: var(--ri-bt-copy); }
.ri-bt-fit-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--ri-bt-line); border-radius: 14px; background: var(--ri-bt-surface); overflow: hidden; }
.ri-bt-fit-grid > div { padding: 25px 28px; }
.ri-bt-fit-grid > div + div { border-left: 1px solid var(--ri-bt-line); }
.ri-bt-fit-positive h3 { color: var(--ri-bt-safe); }
.ri-bt-fit-caution h3 { color: var(--ri-bt-caution); }
.ri-bt-rich-content blockquote { margin: 28px 0; padding: 18px 22px; border-left: 4px solid var(--ri-bt-primary); background: var(--ri-bt-surface); }
.ri-bt-rich-content .cite { font: 500 11px/1 "IBM Plex Mono", monospace; }
.ri-bt-related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 22px; }
.ri-bt-related-card { min-height: 190px; padding: 20px; border: 1px solid var(--ri-bt-line); border-radius: 14px; background: var(--ri-bt-surface); color: var(--ri-bt-ink) !important; text-decoration: none; display: flex; flex-direction: column; }
.ri-bt-related-card:hover { border-color: var(--ri-bt-primary); }
.ri-bt-related-card > span { color: var(--ri-bt-primary); font: 500 9px/1.3 "IBM Plex Mono", monospace; letter-spacing: .09em; text-transform: uppercase; }
.ri-bt-related-card strong { margin-top: 18px; font: 400 23px/1.15 "DM Serif Display", Georgia, serif; }
.ri-bt-related-card small { margin-top: auto; padding-top: 18px; color: var(--ri-bt-muted); line-height: 1.45; }
.ri-bt-method { padding: 30px !important; border: 1px solid var(--ri-bt-ink) !important; border-radius: 14px; background: var(--ri-bt-surface); }
.ri-bt-method h2 { font-size: 30px; }
.ri-bt-final-cta { margin-top: 48px; padding: 30px; border: 2px solid var(--ri-bt-primary); border-radius: 14px; background: var(--ri-bt-surface); display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.ri-bt-final-cta h2 { margin-bottom: 6px; font-size: 32px; }
.ri-bt-final-cta p { margin: 0; }

@media (max-width: 960px) {
    .ri-bt-hero-grid { grid-template-columns: minmax(0, 1fr) 280px; gap: 38px; }
    .ri-bt-title-card { min-height: 380px; }
    .ri-bt-content-grid { display: block; }
    .ri-bt-toc { position: static; display: grid; grid-template-columns: repeat(2, 1fr); margin-bottom: 48px; }
    .ri-bt-toc strong { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
    .ri-bt-wrap { width: min(100% - 32px, 1200px); }
    .ri-bt-page { font-size: 16px; }
    .ri-bt-hero-grid { min-height: 0; padding-block: 42px; display: flex; flex-direction: column; align-items: stretch; }
    .ri-bt-hero h1 { font-size: clamp(42px, 14vw, 62px); }
    .ri-bt-title-card { min-height: 330px; box-shadow: 8px 8px 0 var(--ri-bt-tint); }
    .ri-bt-content-grid { padding-block: 46px 72px; }
    .ri-bt-toc { grid-template-columns: 1fr; }
    .ri-bt-toc strong { grid-column: auto; }
    .ri-bt-evidence-strip,
    .ri-bt-fit-grid,
    .ri-bt-related-grid { grid-template-columns: 1fr; }
    .ri-bt-evidence-strip div + div,
    .ri-bt-fit-grid > div + div { border-left: 0; border-top: 1px solid var(--ri-bt-line); }
    .ri-bt-note,
    .ri-bt-final-cta { align-items: flex-start; flex-direction: column; }
    .ri-bt-buy { width: 100%; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
    .ri-bt-page * { scroll-behavior: auto !important; transition: none !important; }
}