/* ================================================================
   HVAC247PRO — blog-premium.css   |   v1  ·  2026-05-24
   Premium EDITORIAL MAGAZINE blog-post system.
   Display serif (Fraunces) + clean sans body. Navy #0a1628 · Red #e92227.
   2-col: sticky auto-TOC  +  article  +  sticky lead CTA.
   Everything scoped under `.bp` to win on specificity WITHOUT an
   !important cascade-war against the legacy stack.
   ================================================================ */

/* ───────── design tokens (scoped) ───────── */
.bp {
  --bp-navy:      #0a1628;
  --bp-navy-2:    #0d1f44;
  --bp-navy-3:    #061020;
  --bp-ink:       #16202e;
  --bp-ink-soft:  #45566b;
  --bp-ink-mute:  #6b7a8d;
  --bp-red:       #e92227;
  --bp-red-dark:  #c11d22;
  --bp-paper:     #fbfaf8;
  --bp-surface:   #ffffff;
  --bp-wash:      #f5f7fb;
  --bp-line:      #e6ebf2;

  --bp-serif: "Fraunces", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --bp-sans:  "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --bp-shadow-sm: 0 1px 3px rgba(10,22,40,.06), 0 1px 2px rgba(10,22,40,.04);
  --bp-shadow-md: 0 8px 28px rgba(10,22,40,.10);
  --bp-shadow-lg: 0 22px 60px rgba(10,22,40,.16);
  --bp-radius: 16px;
  --bp-measure: 720px;
  --bp-ease: cubic-bezier(.22, 1, .36, 1);

  font-family: var(--bp-sans);
  color: var(--bp-ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.bp *, .bp *::before, .bp *::after { box-sizing: border-box; }

/* reading-progress bar */
.bp-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 9999; background: transparent; pointer-events: none; }
.bp-progress__fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--bp-red) 0%, #ff5a5f 100%); box-shadow: 0 0 10px rgba(233,34,39,.5); transition: width .08s linear; }

/* ════ HERO ════ */
.bp-hero { position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(ellipse 60% 50% at 88% 12%, rgba(233,34,39,.16) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 6% 88%, rgba(59,130,246,.08) 0%, transparent 55%),
    linear-gradient(165deg, var(--bp-navy-3) 0%, var(--bp-navy) 48%, var(--bp-navy-2) 100%);
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 clamp(2rem, 4vw, 3.25rem); }
.bp-hero::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle, rgba(255,255,255,.04) 1px, transparent 1px); background-size: 30px 30px; pointer-events: none; }
.bp-hero__inner { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2rem); }
.bp-breadcrumb { font-size: .8rem; margin-bottom: 1.4rem; color: rgba(255,255,255,.55); }
.bp-breadcrumb a { color: rgba(255,255,255,.55); text-decoration: none; transition: color .15s; }
.bp-breadcrumb a:hover { color: var(--bp-red); }
.bp-breadcrumb span[aria-current] { color: rgba(255,255,255,.85); }
.bp-eyebrow { display: inline-flex; align-items: center; gap: 8px; font-family: var(--bp-sans); font-size: .72rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: #ff6266; margin-bottom: 1.1rem; }
.bp-eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--bp-red); animation: bp-pulse 2s ease-in-out infinite; }
@keyframes bp-pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.7)} }
.bp-hero h1 { font-family: var(--bp-serif); font-optical-sizing: auto; font-weight: 600; font-size: clamp(2.1rem, 5.2vw, 3.85rem); line-height: 1.08; letter-spacing: -.018em; margin: 0 0 1.1rem; color: #fff; max-width: 17ch; }
.bp-hero__lead { font-size: clamp(1.02rem, 1.8vw, 1.22rem); line-height: 1.6; color: rgba(255,255,255,.8); max-width: 60ch; margin: 0 0 1.6rem; }
.bp-hero__meta { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 18px; font-size: .85rem; color: rgba(255,255,255,.6); }
.bp-hero__meta .bp-pill { display: inline-flex; align-items: center; gap: 6px; background: rgba(233,34,39,.9); color: #fff; padding: 4px 13px; border-radius: 30px; font-size: .7rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; border: 1px solid rgba(255,255,255,.14); box-shadow: 0 3px 12px rgba(233,34,39,.3); }
.bp-hero__meta .bp-author-mini { display: inline-flex; align-items: center; gap: 8px; color: rgba(255,255,255,.85); font-weight: 600; }
.bp-hero__meta .bp-author-mini .bp-ava { width: 30px; height: 30px; border-radius: 50%; background: linear-gradient(135deg, var(--bp-red) 0%, #ff5a5f 100%); display: grid; place-items: center; font-weight: 800; font-size: .78rem; color: #fff; box-shadow: 0 2px 8px rgba(233,34,39,.4); }
.bp-hero__meta .sep { opacity: .35; }
.bp-hero__figure { position: relative; z-index: 1; max-width: 1040px; margin: clamp(1.75rem,4vw,2.75rem) auto 0; padding: 0 clamp(1.1rem,4vw,2rem); }
.bp-hero__figure figure { margin: 0; }
.bp-hero__figure .bp-img-frame { border-radius: var(--bp-radius); overflow: hidden; aspect-ratio: 16 / 9; background: rgba(255,255,255,.05); box-shadow: var(--bp-shadow-lg); border: 1px solid rgba(255,255,255,.08); }
.bp-hero__figure img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bp-hero__figure figcaption { margin-top: .65rem; font-size: .76rem; color: rgba(255,255,255,.5); display: flex; align-items: center; gap: 6px; }
.bp-hero__figure figcaption .pin { color: var(--bp-red); }

/* ════ LAYOUT GRID ════ */
.bp-layout { background: var(--bp-paper); padding: clamp(2.25rem, 4vw, 3.5rem) clamp(1.1rem, 4vw, 2rem) clamp(2.5rem, 5vw, 4rem); }
.bp-grid { max-width: 1240px; margin: 0 auto; display: grid; grid-template-columns: 230px minmax(0, var(--bp-measure)) 290px; gap: clamp(1.5rem, 3vw, 3rem); justify-content: center; }

/* TOC rail */
.bp-toc { position: sticky; top: 92px; align-self: start; max-height: calc(100vh - 120px); overflow-y: auto; font-size: .875rem; padding-right: 4px; }
.bp-toc__label { font-family: var(--bp-sans); font-size: .68rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--bp-ink-mute); margin: 0 0 .9rem; padding-left: 14px; }
.bp-toc ul { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--bp-line); }
.bp-toc li { margin: 0; }
.bp-toc a { display: block; padding: 6px 0 6px 14px; margin-left: -2px; border-left: 2px solid transparent; color: var(--bp-ink-soft); text-decoration: none; line-height: 1.4; transition: color .15s, border-color .15s; }
.bp-toc a:hover { color: var(--bp-navy); }
.bp-toc li.is-sub a { padding-left: 26px; font-size: .82rem; color: var(--bp-ink-mute); }
.bp-toc a.is-active { color: var(--bp-red); font-weight: 700; border-left-color: var(--bp-red); }

/* CTA rail */
.bp-cta-rail { position: sticky; top: 92px; align-self: start; }
.bp-cta-card { background: linear-gradient(160deg, var(--bp-navy) 0%, var(--bp-navy-2) 100%); color: #fff; border-radius: var(--bp-radius); padding: 1.6rem 1.4rem; box-shadow: var(--bp-shadow-md); overflow: hidden; position: relative; }
.bp-cta-card::before { content: ""; position: absolute; top: -40px; right: -40px; width: 130px; height: 130px; border-radius: 50%; background: radial-gradient(circle, rgba(233,34,39,.32) 0%, transparent 70%); }
.bp-cta-card__eyebrow { position: relative; font-size: .68rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: #ff6266; margin: 0 0 .5rem; }
.bp-cta-card h3 { position: relative; font-family: var(--bp-serif); font-weight: 600; font-size: 1.3rem; line-height: 1.2; margin: 0 0 .5rem; color: #fff; }
.bp-cta-card p { position: relative; font-size: .86rem; color: rgba(255,255,255,.74); margin: 0 0 1.1rem; line-height: 1.5; }
.bp-cta-card .bp-phone { position: relative; display: flex; align-items: center; gap: 10px; font-family: var(--bp-serif); font-size: 1.45rem; font-weight: 600; color: #fff; text-decoration: none; margin-bottom: 1rem; }
.bp-cta-card .bp-phone .ico { color: var(--bp-red); font-size: 1.1rem; }
.bp-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; padding: 13px 18px; border-radius: 11px; font-family: var(--bp-sans); font-weight: 700; font-size: .92rem; text-decoration: none; text-align: center; cursor: pointer; border: 0; transition: transform .18s var(--bp-ease), box-shadow .18s var(--bp-ease), background .18s; }
.bp-btn--primary { background: var(--bp-red); color: #fff; box-shadow: 0 6px 20px rgba(233,34,39,.4); }
.bp-btn--primary:hover { background: var(--bp-red-dark); transform: translateY(-2px); box-shadow: 0 12px 30px rgba(233,34,39,.52); }
.bp-btn--ghost { background: rgba(255,255,255,.06); color: #fff; border: 1.5px solid rgba(255,255,255,.28); margin-top: 9px; }
.bp-btn--ghost:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.5); transform: translateY(-1px); }
.bp-cta-card__trust { position: relative; margin-top: 1.1rem; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,.12); display: flex; flex-direction: column; gap: 7px; font-size: .78rem; color: rgba(255,255,255,.7); }
.bp-cta-card__trust span { display: flex; align-items: center; gap: 8px; }
.bp-cta-card__trust .ck { color: #3ddc84; flex-shrink: 0; }

/* ════ ARTICLE / PROSE ════ */
.bp-article { min-width: 0; }
.bp-prose { font-size: 1.135rem; line-height: 1.82; color: var(--bp-ink); font-family: var(--bp-sans); }
.bp-prose > p { margin: 0 0 1.4rem; }
.bp-prose > p:first-of-type { font-size: 1.22rem; line-height: 1.7; }
.bp-prose .bp-dropcap::first-letter { font-family: var(--bp-serif); font-weight: 600; float: left; font-size: 4.4rem; line-height: .82; padding: .05em .12em 0 0; margin: .04em 0 0; color: var(--bp-red); }
.bp-prose h2 { font-family: var(--bp-serif); font-optical-sizing: auto; font-weight: 600; font-size: clamp(1.55rem, 2.6vw, 2.05rem); line-height: 1.2; letter-spacing: -.015em; color: var(--bp-navy); margin: 3rem 0 1rem; padding-top: .6rem; scroll-margin-top: 96px; position: relative; }
.bp-prose h2::before { content: ""; display: block; width: 46px; height: 3px; border-radius: 2px; background: linear-gradient(90deg, var(--bp-red), rgba(233,34,39,.2)); margin-bottom: .9rem; }
.bp-prose h3 { font-family: var(--bp-serif); font-weight: 600; font-size: 1.32rem; line-height: 1.3; letter-spacing: -.01em; color: var(--bp-navy); margin: 2rem 0 .7rem; scroll-margin-top: 96px; }
.bp-prose h4 { font-family: var(--bp-sans); font-weight: 800; font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; color: var(--bp-red); margin: 1.8rem 0 .6rem; }
.bp-prose strong { color: var(--bp-navy); font-weight: 700; }
.bp-prose em { color: var(--bp-ink); }
.bp-prose ul, .bp-prose ol { margin: 0 0 1.4rem; padding-left: 1.5rem; }
.bp-prose li { margin-bottom: .5rem; }
.bp-prose ul > li { list-style: none; position: relative; padding-left: .35rem; }
.bp-prose ul > li::before { content: ""; position: absolute; left: -1rem; top: .62em; width: 7px; height: 7px; border-radius: 2px; background: var(--bp-red); transform: rotate(45deg); }
.bp-prose ol { list-style: none; counter-reset: bp-ol; padding-left: 0; }
.bp-prose ol > li { counter-increment: bp-ol; position: relative; padding-left: 2.5rem; margin-bottom: .7rem; }
.bp-prose ol > li::before { content: counter(bp-ol); position: absolute; left: 0; top: .05em; width: 1.7rem; height: 1.7rem; border-radius: 8px; background: var(--bp-navy); color: #fff; font-family: var(--bp-sans); font-weight: 800; font-size: .85rem; display: grid; place-items: center; }
.bp-prose a { color: var(--bp-red); text-decoration: underline; text-decoration-color: rgba(233,34,39,.32); text-underline-offset: 3px; transition: color .15s, text-decoration-color .15s; }
.bp-prose a:hover { color: var(--bp-red-dark); text-decoration-color: var(--bp-red-dark); }
.bp-prose figure { margin: 2rem 0; }
.bp-prose img { max-width: 100%; height: auto; border-radius: 12px; display: block; box-shadow: var(--bp-shadow-md); }
.bp-prose figcaption { margin-top: .55rem; font-size: .8rem; color: var(--bp-ink-mute); font-style: italic; text-align: center; }
.bp-prose .bp-pullquote, .bp-prose blockquote { font-family: var(--bp-serif); font-weight: 500; font-size: clamp(1.3rem, 2.4vw, 1.7rem); line-height: 1.4; letter-spacing: -.01em; color: var(--bp-navy); margin: 2.4rem 0; padding: 0 0 0 1.6rem; border-left: 4px solid var(--bp-red); font-style: normal; }
.bp-prose blockquote p { margin: 0; }
.bp-prose .bp-table-wrap { overflow-x: auto; margin: 1.8rem 0; border-radius: 12px; box-shadow: var(--bp-shadow-sm); }
.bp-prose table { width: 100%; border-collapse: collapse; font-size: .94rem; background: #fff; }
.bp-prose thead th { background: var(--bp-navy); color: #fff; text-align: left; font-weight: 700; padding: 12px 16px; font-size: .85rem; }
.bp-prose td { padding: 11px 16px; border-bottom: 1px solid var(--bp-line); color: var(--bp-ink-soft); }
.bp-prose tbody tr:nth-child(even) td { background: var(--bp-wash); }
.bp-prose tbody tr:last-child td { border-bottom: 0; }
.bp-prose tbody tr:hover td { background: #fff5f5; }
.bp-callout { background: linear-gradient(135deg, #fff 0%, #fef6f6 100%); border: 1px solid var(--bp-line); border-left: 4px solid var(--bp-red); border-radius: 0 14px 14px 0; padding: 1.4rem 1.6rem; margin: 2rem 0; box-shadow: var(--bp-shadow-sm); }
.bp-callout__title { display: flex; align-items: center; gap: 9px; font-family: var(--bp-sans); font-weight: 800; font-size: .8rem; letter-spacing: .07em; text-transform: uppercase; color: var(--bp-red); margin: 0 0 .8rem; }
.bp-callout ul { margin: 0; }
.bp-callout p:last-child, .bp-callout ul:last-child { margin-bottom: 0; }
.bp-inline-cta { background: linear-gradient(135deg, var(--bp-navy) 0%, var(--bp-navy-2) 100%); color: #fff; border-radius: var(--bp-radius); padding: 1.7rem 1.9rem; margin: 2.6rem 0; display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; box-shadow: var(--bp-shadow-md); position: relative; overflow: hidden; }
.bp-inline-cta::before { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse 50% 90% at 95% 50%, rgba(233,34,39,.2) 0%, transparent 60%); }
.bp-inline-cta__txt { position: relative; flex: 1 1 240px; }
.bp-inline-cta h3 { font-family: var(--bp-serif); font-weight: 600; font-size: 1.4rem; margin: 0 0 .3rem; color: #fff; }
.bp-inline-cta p { margin: 0; font-size: .9rem; color: rgba(255,255,255,.74); }
.bp-inline-cta .bp-btn { position: relative; flex: 0 0 auto; width: auto; padding: 13px 26px; }

/* author / E-E-A-T */
.bp-author { display: flex; gap: 1.2rem; align-items: flex-start; background: var(--bp-surface); border: 1px solid var(--bp-line); border-radius: var(--bp-radius); padding: 1.5rem 1.6rem; margin: 2.75rem 0 0; box-shadow: var(--bp-shadow-sm); }
.bp-author__ava { flex: 0 0 auto; width: 58px; height: 58px; border-radius: 14px; background: linear-gradient(135deg, var(--bp-navy) 0%, var(--bp-navy-2) 100%); display: grid; place-items: center; color: #fff; font-family: var(--bp-serif); font-weight: 600; font-size: 1.4rem; box-shadow: 0 4px 14px rgba(10,22,40,.25); }
.bp-author__body { min-width: 0; }
.bp-author__name { font-weight: 800; font-size: 1.02rem; color: var(--bp-navy); margin: 0 0 .15rem; }
.bp-author__role { font-size: .82rem; color: var(--bp-red); font-weight: 700; margin: 0 0 .55rem; }
.bp-author__bio { font-size: .88rem; color: var(--bp-ink-soft); line-height: 1.55; margin: 0 0 .7rem; }
.bp-author__creds { display: flex; flex-wrap: wrap; gap: 7px; }
.bp-author__creds span { display: inline-flex; align-items: center; gap: 6px; background: var(--bp-wash); border: 1px solid var(--bp-line); padding: 4px 11px; border-radius: 30px; font-size: .76rem; font-weight: 600; color: var(--bp-navy); }
.bp-author__creds .ico { color: var(--bp-red); }

/* FAQ */
.bp-faq { margin: 2.75rem 0 0; }
.bp-faq__h { font-family: var(--bp-serif); font-weight: 600; font-size: 1.75rem; color: var(--bp-navy); margin: 0 0 1.2rem; letter-spacing: -.015em; }
.bp-faq__item { border: 1px solid var(--bp-line); border-radius: 12px; margin-bottom: .7rem; background: var(--bp-surface); overflow: hidden; transition: box-shadow .2s, border-color .2s; }
.bp-faq__item[open] { box-shadow: var(--bp-shadow-sm); border-color: #f3c9cb; }
.bp-faq__q { list-style: none; cursor: pointer; padding: 1.05rem 1.3rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; font-weight: 700; font-size: 1.02rem; color: var(--bp-navy); }
.bp-faq__q::-webkit-details-marker { display: none; }
.bp-faq__q .bp-faq__ico { flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%; background: var(--bp-wash); color: var(--bp-red); display: grid; place-items: center; font-size: 1rem; font-weight: 800; transition: transform .25s var(--bp-ease), background .2s; }
.bp-faq__item[open] .bp-faq__ico { transform: rotate(45deg); background: var(--bp-red); color: #fff; }
.bp-faq__a { padding: 0 1.3rem 1.2rem; color: var(--bp-ink-soft); font-size: .96rem; line-height: 1.7; }
.bp-faq__a p { margin: 0 0 .7rem; } .bp-faq__a p:last-child { margin: 0; }

/* related */
.bp-related { background: var(--bp-surface); border-top: 1px solid var(--bp-line); padding: clamp(2.5rem,5vw,4rem) clamp(1.1rem,4vw,2rem); }
.bp-related__inner { max-width: 1100px; margin: 0 auto; }
.bp-related__h { font-family: var(--bp-serif); font-weight: 600; font-size: clamp(1.5rem,3vw,2rem); color: var(--bp-navy); margin: 0 0 .35rem; letter-spacing: -.015em; text-align: center; }
.bp-related__sub { text-align: center; color: var(--bp-ink-mute); font-size: .95rem; margin: 0 0 2rem; }
.bp-related__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.bp-card { display: flex; flex-direction: column; background: var(--bp-surface); border: 1px solid var(--bp-line); border-radius: var(--bp-radius); overflow: hidden; text-decoration: none; color: inherit; transition: transform .22s var(--bp-ease), box-shadow .22s var(--bp-ease), border-color .22s; }
.bp-card:hover { transform: translateY(-5px); box-shadow: var(--bp-shadow-lg); border-color: #f3c9cb; }
.bp-card__img { aspect-ratio: 16/10; overflow: hidden; background: var(--bp-wash); }
.bp-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--bp-ease); }
.bp-card:hover .bp-card__img img { transform: scale(1.06); }
.bp-card__body { padding: 1.1rem 1.2rem 1.3rem; display: flex; flex-direction: column; flex: 1; }
.bp-card__cat { font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--bp-red); margin-bottom: .5rem; }
.bp-card__title { font-family: var(--bp-serif); font-weight: 600; font-size: 1.1rem; line-height: 1.3; color: var(--bp-navy); margin: 0 0 .9rem; }
.bp-card__more { margin-top: auto; font-size: .82rem; font-weight: 700; color: var(--bp-red); display: inline-flex; align-items: center; gap: 6px; }
.bp-card__more .arw { transition: transform .2s var(--bp-ease); }
.bp-card:hover .bp-card__more .arw { transform: translateX(4px); }

/* ════ FINAL CTA band ════ */
.bp-final { position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(ellipse 55% 75% at 10% 50%, rgba(14,34,71,.95) 0%, transparent 65%),
    radial-gradient(ellipse 50% 60% at 92% 30%, rgba(233,34,39,.22) 0%, transparent 55%),
    linear-gradient(135deg, var(--bp-navy-3) 0%, var(--bp-navy) 50%, var(--bp-navy-2) 100%);
  padding: clamp(2.75rem,5vw,4.5rem) clamp(1.1rem,4vw,2rem); }
.bp-final::after { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle, rgba(255,255,255,.025) 1px, transparent 1px); background-size: 30px 30px; pointer-events: none; }
.bp-final__inner { position: relative; z-index: 1; max-width: 1000px; margin: 0 auto; display: flex; align-items: center; gap: 2.5rem; flex-wrap: wrap; }
.bp-final__txt { flex: 1 1 320px; }
.bp-final h2 { font-family: var(--bp-serif); font-weight: 600; font-size: clamp(1.7rem,3.5vw,2.5rem); line-height: 1.15; margin: 0 0 .7rem; color: #fff; letter-spacing: -.015em; }
.bp-final p { font-size: 1.02rem; color: rgba(255,255,255,.78); margin: 0; max-width: 52ch; }
.bp-final__actions { display: flex; flex-direction: column; gap: 12px; min-width: 230px; flex: 0 0 auto; }
.bp-final__phone { font-family: var(--bp-serif); font-weight: 600; font-size: 1.9rem; color: #fff; text-decoration: none; display: flex; align-items: center; gap: 11px; margin-bottom: .3rem; }
.bp-final__phone .ico { color: var(--bp-red); }

/* mobile TOC */
.bp-toc-mobile { display: none; }
@media (max-width: 1080px) {
  .bp-grid { grid-template-columns: minmax(0, var(--bp-measure)) 290px; }
  .bp-toc { display: none; }
  .bp-toc-mobile { display: block; }
}
@media (max-width: 860px) {
  .bp-grid { grid-template-columns: minmax(0, 1fr); }
  .bp-cta-rail { position: static; margin-top: 2.5rem; }
  .bp-related__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .bp-related__grid { grid-template-columns: 1fr; }
  .bp-final__inner { flex-direction: column; text-align: center; }
  .bp-final__actions { width: 100%; }
  .bp-prose { font-size: 1.06rem; }
  .bp-prose > p:first-of-type { font-size: 1.12rem; }
}
.bp-toc-mobile { background: var(--bp-surface); border: 1px solid var(--bp-line); border-radius: 12px; margin-bottom: 1.75rem; overflow: hidden; }
.bp-toc-mobile summary { list-style: none; cursor: pointer; padding: .95rem 1.2rem; display: flex; align-items: center; justify-content: space-between; font-weight: 800; font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--bp-navy); }
.bp-toc-mobile summary::-webkit-details-marker { display: none; }
.bp-toc-mobile summary .chev { transition: transform .25s var(--bp-ease); color: var(--bp-red); }
.bp-toc-mobile[open] summary .chev { transform: rotate(180deg); }
.bp-toc-mobile ul { list-style: none; margin: 0; padding: 0 1.2rem 1rem; }
.bp-toc-mobile a { display: block; padding: 6px 0; color: var(--bp-ink-soft); text-decoration: none; font-size: .9rem; }
.bp-toc-mobile a:hover { color: var(--bp-red); }
.bp-toc-mobile li.is-sub a { padding-left: 14px; font-size: .84rem; color: var(--bp-ink-mute); }
@media (prefers-reduced-motion: reduce) { .bp *, .bp *::before, .bp *::after { animation: none !important; transition: none !important; } }