/* Mobile B accepted by owner 2026-09-07. Exact P47 review geometry promoted to native. */
@media (max-width: 760px) {
  body.mobile-compact-b { --section-space-mobile: 42px; --section-space-tablet: 52px; }
  body.mobile-compact-b .section { width: calc(100% - 32px); padding-block: 42px; }
  body.mobile-compact-b .hero { padding-top: 88px; padding-bottom: 32px; gap: 20px; }
  body.mobile-compact-b .hero-copy { text-align: left; }
  body.mobile-compact-b .eyebrow { font-size: 10px; letter-spacing: .035em; }
  body.mobile-compact-b .hero h1 { margin: 18px 0; font-size: clamp(32px,9.8vw,42px); line-height: 1.05; letter-spacing: -.035em; }
  body.mobile-compact-b .hero-lead { font-size: 15px; line-height: 1.55; }
  body.mobile-compact-b .hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
  body.mobile-compact-b .hero-actions .button { width: 100%; min-height: 48px; padding: 12px 8px; font-size: 12px; line-height: 1.35; gap: 6px; }
  body.mobile-compact-b .hero-actions .text-link { grid-column: 1/-1; justify-content: flex-start; padding-block: 8px; }
  body.mobile-compact-b .hero-free-note { font-size: 12px; line-height: 1.5; margin-top: 12px; }
  body.mobile-compact-b .trust-row { display: flex; flex-flow: row wrap; justify-content: flex-start; gap: 8px 14px; margin-top: 18px; font-size: 11px; }
  body.mobile-compact-b .mobile-compact-details { width: 100%; margin: 14px 0 0; padding: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
  body.mobile-compact-b .mobile-compact-details > summary { display: flex; justify-content: space-between; align-items: center; gap: 10px; min-height: 44px; padding: 12px 14px; font-size: 13px; font-weight: 650; color: var(--muted-strong); cursor: pointer; }
  body.mobile-compact-b .mobile-compact-details > summary::after { content: '+'; font-size: 18px; color: var(--sand); }
  body.mobile-compact-b .mobile-compact-details[open] > summary::after { content: '−'; }
  body.mobile-compact-b .mobile-compact-details > summary::-webkit-details-marker { display: none; }
  body.mobile-compact-b .mobile-compact-details > :not(summary) { margin: 16px 14px; }
  body.mobile-compact-b .mobile-compact-hero-preview .hero-visual { margin-inline: 0; margin-top: 0; margin-bottom: 0; }
  body.mobile-compact-b .section-heading h2,
  body.mobile-compact-b .inside h2,
  body.mobile-compact-b .channel-library h2,
  body.mobile-compact-b .author h2,
  body.mobile-compact-b .buddy-heading h2,
  body.mobile-compact-b .demo-heading-left h2,
  body.mobile-compact-b .access-heading h2,
  body.mobile-compact-b .reviews-heading h2 { font-size: clamp(28px,8.3vw,34px); line-height: 1.1; letter-spacing: -.035em; }
  body.mobile-compact-b .section-heading > p:last-child,
  body.mobile-compact-b .inside-copy > p:not(.section-label),
  body.mobile-compact-b .channel-library-copy > p:not(.section-label),
  body.mobile-compact-b .buddy-heading > p:not(.section-label),
  body.mobile-compact-b .demo-heading-left > p:not(.section-label) { font-size: 15px; line-height: 1.55; }
  body.mobile-compact-b .system-heading-centered { text-align: left; }
  body.mobile-compact-b .system-grid { margin-top: 22px; gap: 14px; }
  body.mobile-compact-b .system-card { padding: 24px 20px 20px; min-height: 0; border-radius: 22px; }
  body.mobile-compact-b .system-copy h3 { font-size: 25px; margin-block: 12px; }
  body.mobile-compact-b .system-copy p { font-size: 14px; line-height: 1.55; }
  body.mobile-compact-b .system-number { font-size: 44px; top: 10px; right: 20px; }
  body.mobile-compact-b .system-more { margin-top: 14px; }
  body.mobile-compact-b .channel-mini-covers { min-height: 190px; height: 190px; }
  body.mobile-compact-b .statement.statement-bridge { padding-block: 36px; }
  body.mobile-compact-b .statement-bridge-card { padding: 26px 22px; }
  body.mobile-compact-b .statement-quote.statement-bridge .statement-bridge-card h2 { font-size: 23px; line-height: 1.28; }
  body.mobile-compact-b .practice-explorer { padding: 12px; border-radius: 22px; }
  body.mobile-compact-b .practice-core-grid { grid-template-columns: repeat(2,minmax(0,1fr)); grid-auto-rows: minmax(46px,auto); gap: 8px; }
  body.mobile-compact-b .practice-chip { padding: 10px 8px; font-size: 12px; min-height: 46px; }
  body.mobile-compact-b .practice-special-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
  body.mobile-compact-b :is(.practice-chip-special,.practice-chip-duel) { min-height: 110px; padding: 12px; }
  body.mobile-compact-b .practice-chip-icon { left: 12px; top: 12px; width: 26px; height: 26px; }
  body.mobile-compact-b .practice-chip-duel .duel-icon { left: 14px; top: 12px; width: 25px; height: 25px; }
  body.mobile-compact-b :is(.practice-chip-special,.practice-chip-duel) .practice-chip-copy { padding-top: 34px; gap: 6px; }
  body.mobile-compact-b .practice-chip-copy strong { min-height: 0; font-size: 12px; }
  body.mobile-compact-b .practice-chip-copy small { font-size: 11px; line-height: 1.3; }
  body.mobile-compact-b .practice-chip-orbit { display: none; }
  body.mobile-compact-b .practice-panel { padding: 20px 16px; }
  body.mobile-compact-b .practice-panel h3 { font-size: 26px; }
  body.mobile-compact-b .practice-panel > p { font-size: 14px; line-height: 1.55; }
  body.mobile-compact-b .demo-tabs { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 6px; white-space: normal; overflow: visible; }
  body.mobile-compact-b .demo-tabs button { padding: 10px 6px; min-height: 46px; height: auto; white-space: normal; font-size: 11px; }
  body.mobile-compact-b .demo-tabs button:last-child { grid-column: 1/-1; }
  body.mobile-compact-b .buddy-steps { gap: 6px; }
  body.mobile-compact-b .buddy-steps button { min-height: 44px; padding: 10px 8px; }
  body.mobile-compact-b .demo-layout,
  body.mobile-compact-b .buddy-layout { gap: 22px; }
  body.mobile-compact-b .demo-copy-panel { padding: 24px 20px; }
  body.mobile-compact-b .demo-copy-panel h3,
  body.mobile-compact-b .buddy-copy h3 { font-size: 26px; line-height: 1.15; }
  body.mobile-compact-b .demo-copy-panel > p,
  body.mobile-compact-b .buddy-copy p { font-size: 14px; line-height: 1.55; }
  body.mobile-compact-b .telegram-shell { height: 510px; }
  body.mobile-compact-b .demo-product-panel { padding: 16px 10px; }
  body.mobile-compact-b .buddy-shot-placeholder { min-height: 200px; }
  body.mobile-compact-b .author-portrait { max-width: 280px; margin-inline: auto; }
  body.mobile-compact-b .author-facts { gap: 10px; }
  body.mobile-compact-b #access { gap: 16px; }
  body.mobile-compact-b #access .access-card { padding: 24px 20px; }
  body.mobile-compact-b #access .access-card > p { min-height: 0; font-size: 14px; }
  body.mobile-compact-b #access .access-price { min-height: 0; padding-block: 18px; }
  body.mobile-compact-b #access .access-compare { margin-block: 18px; gap: 10px; }
  body.mobile-compact-b .faq-compact { gap: 22px; }
  body.mobile-compact-b .faq-compact summary { padding: 13px 14px; }
  body.mobile-compact-b .final-cta { padding: 30px 20px; }
  body.mobile-compact-b .final-cta h2 { font-size: 32px; }
  body.materials-page.mobile-compact-b .materials-hero { padding-block: 30px 26px; }
  body.materials-page.mobile-compact-b .materials-hero h1 { font-size: 40px; }
  body.materials-page.mobile-compact-b .materials-lead { font-size: 14px; line-height: 1.55; }
  body.materials-page.mobile-compact-b .materials-library h2 { font-size: 30px; }
  body.materials-page.mobile-compact-b .materials-library-head { gap: 16px; }
  body.materials-page.mobile-compact-b .materials-library { padding: 20px 12px; }
  body.materials-page.mobile-compact-b .materials-tabs { gap: 4px; }
  body.materials-page.mobile-compact-b .materials-tab { min-height: 44px; font-size: 11px; padding: 9px 5px; }
  body.materials-page.mobile-compact-b .materials-category-copy { font-size: 13px; line-height: 1.5; margin-block: 16px; }
  body.materials-page.mobile-compact-b .materials-workspace { min-height: 0; }
  body.materials-page.mobile-compact-b .materials-workspace .materials-browser { min-height: 0; max-height: min(62svh,580px); }
  body.materials-page.mobile-compact-b .materials-workspace .materials-reader { min-height: 0; }
  body.materials-page.mobile-compact-b .materials-list,
  body.materials-page.mobile-compact-b .audio-list { max-height: 46svh; min-height: 0; }
  body.materials-page.mobile-compact-b .article-reader-card,
  body.materials-page.mobile-compact-b .audio-reader-card { padding: 16px 12px; }
  body.materials-page.mobile-compact-b .article-reader-body { margin-top: 22px; }
  body.materials-page.mobile-compact-b .article-reader-body h2,
  body.materials-page.mobile-compact-b .audio-reader-intro h2 { font-size: 28px; }
  body.materials-page.mobile-compact-b .article-reader-body p { font-size: 16px; line-height: 1.7; }
  body.materials-page.mobile-compact-b .audio-reader-cover { width: 160px; height: 160px; margin-inline: auto; }
  body.materials-page.mobile-compact-b .materials-channel-card { padding: 20px; }
}

@media (max-width:760px) { body.mobile-compact-b .mobile-compact-details > summary { position:relative; z-index:10; scroll-margin-top:110px; } }
@media (max-width:760px) {
  body.mobile-compact-b .hero { grid-template-columns: minmax(0,1fr); }
  body.mobile-compact-b .hero-copy { width: 100%; max-width: 100%; min-width: 0; }
  body.mobile-compact-b .hero-actions { grid-template-columns: repeat(2,minmax(0,1fr)); }
  body.mobile-compact-b .hero-actions .button { white-space: normal; min-width: 0; }
  body.mobile-compact-b .mobile-compact-details { min-width: 0; }
}

/* C002: accepted A disclosure boundary; value copy never enters a fold. */
@media (max-width: 760px) {
  body.mobile-compact-b :is(#channel-library,#demo,#buddy) { padding-block: 32px; }
  body.mobile-compact-b #channel-library { gap: 0; }
  body.mobile-compact-b :is(#demo,#buddy) .demo-layout { display: grid; grid-template-columns: minmax(0,1fr); gap: 0; }
  body.mobile-compact-b :is(#demo,#buddy) .section-heading { width: 100%; max-width: none; margin: 0; }
  body.mobile-compact-b :is(#demo,#buddy) .section-heading h2 { font-size: clamp(28px,8vw,33px); margin-block: 14px 18px; }
  body.mobile-compact-b :is(#demo,#buddy) .section-heading > p:not(.section-label) { max-width: none; font-size: 15px; line-height: 1.55; margin-bottom: 14px; }
  body.mobile-compact-b #buddy .section-heading > .buddy-inclusion { font-size: 12px; margin-top: 16px; }
  body.mobile-compact-b .mobile-compact-flow { margin-top: 14px; }
  body.mobile-compact-b .mobile-compact-flow > summary { list-style: none; color: var(--text); min-height: 48px; font-size: 14px; }
  body.mobile-compact-b .mobile-compact-flow > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -3px; border-radius: 14px; }
  body.mobile-compact-b .mobile-compact-flow > :not(summary) { margin: 12px; min-width: 0; }
  body.mobile-compact-b .mobile-compact-flow > .channel-browser-nav { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 6px; }
  body.mobile-compact-b .mobile-compact-flow .channel-filter { min-height: 44px; padding: 10px 6px; font-size: 12px; }
  body.mobile-compact-b .mobile-compact-flow > .channel-library-note { font-size: 14px; line-height: 1.55; }
  body.mobile-compact-b .mobile-compact-flow > .channel-browser { width: auto; }
  body.mobile-compact-b .mobile-compact-flow > .open-materials-strip { width: auto; padding: 18px 14px; margin: 12px; display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
  body.mobile-compact-b .mobile-compact-flow > .open-materials-strip h3 { font-size: 23px; }
  body.mobile-compact-b .mobile-compact-flow > .open-materials-strip p { font-size: 14px; }
  body.mobile-compact-b :is(#demo,#buddy) :is(.demo-stage,.buddy-stage) { display: block; width: auto; max-width: none; margin: 12px; }
  body.mobile-compact-b .product-step-rail :is(.demo-tabs,.buddy-steps) {
    display: flex; flex-flow: row nowrap; overflow-x: auto; overflow-y: hidden; gap: 5px;
    width: 100%; padding: 5px; scroll-padding-inline: 5px; scrollbar-width: thin; margin: 0;
  }
  body.mobile-compact-b .product-step-rail :is(.demo-tabs,.buddy-steps) button {
    flex: 0 0 auto; width: auto; min-height: 44px; padding: 9px 10px; white-space: nowrap; font-size: 12px; grid-column: auto;
  }
  body.mobile-compact-b .product-step-rail :is(.demo-copy-panel,.buddy-copy) { margin: 14px 0 18px; padding: 0 3px; }
  body.mobile-compact-b .product-step-rail :is(.demo-copy-panel,.buddy-copy) h3 { font-size: 23px; margin: 8px 0; }
  body.mobile-compact-b .product-step-rail :is(.demo-copy-panel,.buddy-copy) p { font-size: 14px; line-height: 1.5; }
  body.mobile-compact-b #demo .demo-product-panel { height: 458px; min-height: 458px; padding: 12px 8px; }
  body.mobile-compact-b #demo .telegram-shell { height: 434px; }
  body.mobile-compact-b #demo [data-demo-screen] { width: calc(100% - 16px); }
  body.mobile-compact-b #buddy .buddy-preview { min-height: 390px; padding: 14px; }
  body.mobile-compact-b #buddy .buddy-shot-placeholder { min-height: 292px; }
  body.mobile-compact-b #inside .practice-panel { padding: 18px 14px; }
  body.mobile-compact-b #inside .practice-panel h3 { font-size: 25px; line-height: 1.12; }
  body.mobile-compact-b #inside .practice-panel > p { font-size: 14px; line-height: 1.55; }
  body.mobile-compact-b #inside :is(.practice-chip-special,.practice-chip-duel) { min-height: 112px; padding: 12px; }
  body.mobile-compact-b #inside .practice-chip-copy { padding-top: 32px; }
  body.mobile-compact-b #inside .practice-chip-copy strong { min-height: 30px; }
  body.mobile-compact-b #access .access-compare { margin-block: 14px 8px; }
  body.mobile-compact-b #access .access-price { padding-block: 12px 14px; }
  body.mobile-compact-b .faq-compact .faq-group-title { font-size: 12px; margin-top: 2px; }
}

/* C003 owner choice: B grid. Five AI steps occupy exactly two rows (3 + 2). */
@media (max-width: 760px) {
  body.mobile-compact-b .product-step-rail :is(.demo-tabs,.buddy-steps) {
    display: grid; grid-template-columns: repeat(6,minmax(0,1fr));
    overflow: visible; gap: 5px; padding: 5px;
  }
  body.mobile-compact-b .product-step-rail :is(.demo-tabs,.buddy-steps) button {
    width: 100%; min-width: 0; min-height: 44px; padding: 8px 5px;
    justify-content: flex-start; white-space: normal; font-size: 12px; gap: 5px;
    grid-column: span 2;
  }
  body.mobile-compact-b .product-step-rail .demo-tabs button:nth-child(n+4),
  body.mobile-compact-b .product-step-rail .buddy-steps button { grid-column: span 3; }
  body.mobile-compact-b .product-step-rail :is(.demo-tabs,.buddy-steps) button > span {
    flex-basis: 18px; width: 18px; height: 18px; font-size: 10px;
  }
  body.mobile-compact-b .product-step-rail .step-hint { margin-top: 12px; padding-top: 12px; }
  body.mobile-compact-b .product-step-rail .step-hint > p { font-size: 12px; }
  /* Same visual family and icon motion as FAQ, with an opaque card surface. */
  body.mobile-compact-b .mobile-compact-details {
    border-radius: 16px; background: linear-gradient(145deg,var(--surface-focal),var(--surface));
    transition: border-color .24s ease, background-color .24s ease;
  }
  body.mobile-compact-b .mobile-compact-details > summary {
    color: var(--muted-strong); font-weight: 600; position: relative; z-index: 1;
  }
  body.mobile-compact-b .mobile-compact-details[open] { border-color: var(--line-strong); }
  body.mobile-compact-b .mobile-compact-details > summary::after {
    content: '+'; display: grid; place-items: center; flex: 0 0 26px;
    width: 26px; height: 26px; border: 1px solid var(--line); border-radius: 50%;
    background: var(--surface-raised); color: var(--muted-strong); font-size: 16px;
    font-weight: 400; transition: transform .36s cubic-bezier(.2,.75,.2,1),background-color .24s ease;
  }
  body.mobile-compact-b .mobile-compact-details[open] > summary::after {
    content: '+'; transform: rotate(45deg); background: var(--accent-soft); color: var(--accent);
  }
  html[data-theme="light"] body.mobile-compact-b .mobile-compact-details { background: linear-gradient(135deg,#fffdf9,#f0f2f4); }
}
@media (max-width: 359px) {
  body.mobile-compact-b .product-step-rail .demo-tabs button { font-size: 11px; padding-inline: 3px; gap: 3px; }
  body.mobile-compact-b .product-step-rail .demo-tabs button > span { flex-basis: 16px; width: 16px; height: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  body.mobile-compact-b .mobile-compact-details > summary::after { transition: none; }
}

/* C005: disclosure flow must preserve the common intrinsic description height. */
@media (max-width:760px) {
 body.mobile-compact-b .product-step-rail :is(.demo-copy-panel,.buddy-copy) { display:grid; grid-template-columns:minmax(0,1fr); }
}