.single-book-page{
  --sb-deep:#03191d;
  --sb-deep-soft:#062e33;
  --sb-teal:#0a4d56;
  --sb-gold:#d49b3a;
  --sb-gold-light:#f0ce87;
  background:
    linear-gradient(180deg,var(--bd-bg) 0,var(--bd-bg) 25%,color-mix(in srgb,var(--bd-primary-100) 42%,var(--bd-bg)) 48%,var(--bd-bg) 72%);
  overflow:visible;
  overflow-x:clip;
}

.single-book-page .sb-main{padding-top:0}
.single-book-page section[id]{scroll-margin-top:126px}
.single-book-page button{font-family:var(--font-body);cursor:pointer}

.sb-hero-wrap{padding-top:10px}
.sb-breadcrumb{
  min-height:34px;
  display:flex;
  align-items:center;
  gap:5px;
  overflow:hidden;
  color:var(--bd-muted);
  font-size:9px;
  white-space:nowrap;
}
.sb-breadcrumb a{transition:color .2s ease}
.sb-breadcrumb a:hover{color:var(--bd-primary-600)}
.sb-breadcrumb svg{width:12px;height:12px;flex:0 0 auto}

.sb-hero{
  position:relative;
  isolation:isolate;
  padding:24px 18px 18px;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  justify-items:center;
  gap:18px;
  overflow:hidden;
  color:#f8fafc;
  border:1px solid rgba(199,222,225,.14);
  border-radius:24px;
  background:
    radial-gradient(circle at 12% 22%,rgba(95,168,176,.18),transparent 34%),
    radial-gradient(circle at 88% 88%,rgba(212,155,58,.1),transparent 28%),
    linear-gradient(145deg,#03191d 0%,#062e33 58%,#08404a 100%);
  box-shadow:0 20px 52px rgba(3,25,29,.2),inset 0 0 0 1px rgba(232,181,96,.06);
}
.sb-hero::after{
  content:"";
  position:absolute;
  inset:7px;
  z-index:-1;
  border:1px solid rgba(232,181,96,.18);
  border-radius:18px;
  pointer-events:none;
}
.sb-hero-mark{
  position:absolute;
  left:-16px;
  top:-9px;
  width:104px;
  height:81px;
  opacity:.17;
  background:linear-gradient(145deg,var(--sb-gold-light),var(--sb-gold));
  -webkit-mask:url("../images/bookademy-redesign/brand/arrow-mark.png") center/contain no-repeat;
  mask:url("../images/bookademy-redesign/brand/arrow-mark.png") center/contain no-repeat;
}

.sb-cover-stage{
  position:relative;
  align-self:start;
  width:clamp(184px,56vw,220px);
  aspect-ratio:2/3;
  display:grid;
  place-items:center;
  overflow:hidden;
  border:0;
  border-radius:14px;
  background:#fff;
  box-shadow:rgba(0,0,0,.65) 0 40px 80px -24px,rgba(255,255,255,.08) 0 0 0 6px;
  transform:matrix3d(.990268,0,.139173,-.000115978,-.00485707,.999391,.0345599,-.0000287999,-.139088,-.0348995,.989665,-.000824721,0,0,0,1);
  transform-origin:center;
}
.sb-cover-stage::before{
  content:"";
  position:absolute;
  inset:0 0 0 auto;
  z-index:2;
  width:5%;
  min-width:10px;
  background:linear-gradient(90deg,rgba(0,0,0,.25) 0%,rgba(255,255,255,.05) 50%,rgba(0,0,0,.15) 100%);
  pointer-events:none;
}
.sb-cover-stage::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  background:linear-gradient(112deg,rgba(255,255,255,.12),transparent 22%,transparent 74%,rgba(0,0,0,.1));
  pointer-events:none;
}
.sb-cover-aura{display:none}
.sb-cover-stage>img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
  border-radius:0;
  box-shadow:none;
}
.sb-cover-pro{
  position:absolute;
  left:8px;
  top:12px;
  min-height:25px;
  padding:0 7px;
  display:flex;
  align-items:center;
  gap:4px;
  border:1px solid rgba(240,206,135,.44);
  border-radius:8px 3px 3px 8px;
  color:#261b09;
  background:linear-gradient(135deg,#f0ce87,#d49b3a);
  box-shadow:0 7px 16px rgba(0,0,0,.24);
  font-family:Montserrat,var(--font-body);
  font-size:8px;
  font-weight:800;
  letter-spacing:.08em;
  z-index:3;
}
.sb-cover-pro svg{width:11px;height:11px}

.sb-hero-copy{position:relative;z-index:2;min-width:0;text-align:center}
.sb-hero-kickers{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap}
.sb-hero-kickers a,.sb-hero-kickers span{
  min-height:27px;
  padding:0 8px;
  display:inline-flex;
  align-items:center;
  gap:5px;
  border:1px solid rgba(199,222,225,.16);
  border-radius:999px;
  color:#c7dee1;
  background:rgba(255,255,255,.055);
  font-size:8px;
  font-weight:800;
}
.sb-hero-kickers a{color:#f6e1b7;border-color:rgba(232,181,96,.28)}
.sb-hero-kickers svg{width:12px;height:12px}
.sb-hero h1{
  margin:10px 0 6px;
  color:#fff;
  font-size:29px;
  line-height:1.4;
  letter-spacing:-.025em;
}
.sb-subtitle{margin:0;color:#c7dee1;font-size:10px;line-height:1.8}
.sb-author-inline{
  width:max-content;
  max-width:100%;
  min-height:38px;
  margin:10px auto 0;
  padding:3px 4px 3px 9px;
  display:grid;
  grid-template-columns:30px minmax(0,1fr) 14px;
  align-items:center;
  gap:7px;
  border:1px solid rgba(199,222,225,.12);
  border-radius:12px;
  background:rgba(255,255,255,.045);
}
.sb-author-inline img{width:30px;height:30px;object-fit:cover;object-position:center 18%;border-radius:9px}
.sb-author-inline span{display:grid;min-width:0}
.sb-author-inline small{color:#a7ced3;font-size:7px}
.sb-author-inline strong{overflow:hidden;color:#f8fafc;font-size:9px;white-space:nowrap;text-overflow:ellipsis}
.sb-author-inline>svg{width:12px;height:12px;color:#e8b560}
.sb-hero-summary{display:none}

.sb-hero-actions{
  width:100%;
  margin-top:13px;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:9px;
}
.sb-hero-actions.is-single{grid-template-columns:minmax(0,220px)}
.sb-hero-actions button{min-width:0;height:56px;border-radius:14px}
.sb-action-standard,.sb-action-pro{
  padding:0 11px;
  display:grid;
  grid-template-columns:18px minmax(0,1fr) 15px;
  align-items:center;
  gap:8px;
  text-align:right;
  font-weight:900;
  white-space:nowrap;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.sb-action-standard{
  color:#f3f8f9;
  border:1px solid rgba(199,222,225,.2);
  background:#0a4d56;
  box-shadow:0 8px 18px rgba(3,25,29,.18);
}
.sb-action-pro{
  color:#241806;
  border:1px solid #f0ce87;
  background:linear-gradient(135deg,#f6e1b7 0%,#e8b560 50%,#c08a2e 100%);
  box-shadow:0 12px 26px rgba(192,138,46,.3),inset 0 1px rgba(255,255,255,.42);
}
.sb-action-standard:hover,.sb-action-pro:hover{transform:translateY(-2px)}
.sb-action-standard>span,.sb-action-pro>span{display:grid;min-width:0}
.sb-action-standard strong,.sb-action-pro strong{font-size:10px;line-height:1.4}
.sb-action-standard small,.sb-action-pro small{font-size:7px;line-height:1.5;font-weight:650}
.sb-action-standard small{color:#a7ced3}
.sb-action-pro small{color:#4e3607}
.sb-action-standard svg,.sb-action-pro svg{width:17px;height:17px}
.sb-action-standard svg:last-child,.sb-action-pro svg:last-child{width:14px}

.sb-facts{
  grid-column:1/-1;
  width:100%;
  margin-top:2px;
  padding-top:12px;
  display:flex;
  gap:8px;
  overflow-x:auto;
  border-top:1px solid rgba(199,222,225,.12);
  scrollbar-width:none;
  scroll-snap-type:x proximity;
}
.sb-facts::-webkit-scrollbar{display:none}
.sb-fact{
  min-width:116px;
  min-height:48px;
  padding:7px 9px;
  display:grid;
  grid-template-columns:30px 1fr;
  align-items:center;
  gap:7px;
  scroll-snap-align:start;
  border:1px solid rgba(199,222,225,.12);
  border-radius:12px;
  background:rgba(255,255,255,.04);
}
.sb-fact>svg{width:17px;height:17px;color:#e8b560}
.sb-fact>span{display:grid}
.sb-fact strong{color:#f8fafc;font-size:10px;line-height:1.5}
.sb-fact small{color:#a7ced3;font-size:7px}

.sb-section-nav{
  position:sticky;
  top:64px;
  z-index:48;
  margin-top:10px;
  border-block:1px solid var(--bd-border);
  background:color-mix(in srgb,var(--bd-bg) 94%,transparent);
  -webkit-backdrop-filter:blur(9px);
  backdrop-filter:blur(9px);
}
.sb-section-nav .bd-container{display:flex;gap:5px;overflow-x:auto;padding-block:7px;scrollbar-width:none}
.sb-section-nav .bd-container::-webkit-scrollbar{display:none}
.sb-section-nav button{
  min-height:44px;
  padding:0 13px;
  flex:0 0 auto;
  color:var(--bd-muted);
  border:0;
  border-radius:10px;
  background:transparent;
  font-size:9px;
  font-weight:800;
}
.sb-section-nav button.is-active{color:var(--bd-primary-700);background:var(--bd-primary-100)}
.single-book-page[data-theme="dark"] .sb-section-nav button.is-active{color:var(--bd-primary-100);background:var(--bd-primary-800)}

.sb-section-title>span{display:block;margin-bottom:4px;color:var(--bd-primary-600);font-size:10px;font-weight:900}
.sb-section-title h2{margin:0;color:var(--bd-ink);font-size:25px;line-height:1.55;letter-spacing:-.018em}
.sb-section-title p{margin:5px 0 0;max-width:640px;color:var(--bd-muted);font-size:11px;line-height:1.9}
.single-book-page[data-theme="dark"] .sb-section-title>span{color:var(--bd-primary-300)}

.sb-overview{padding-block:44px 38px}
.sb-overview-grid{margin-top:18px;display:grid;gap:12px}
.sb-overview-lead{
  position:relative;
  margin:0;
  padding:20px 18px;
  overflow:hidden;
  border:1px solid var(--bd-border);
  border-radius:20px;
  background:var(--bd-card);
  box-shadow:var(--bd-shadow-soft);
}
.sb-overview-lead>svg{position:absolute;left:16px;top:14px;width:46px;height:46px;color:var(--bd-primary-100);stroke-width:1.2}
.single-book-page[data-theme="dark"] .sb-overview-lead>svg{color:var(--bd-primary-800)}
.sb-overview-lead p{position:relative;margin:0;color:var(--bd-ink-soft);font-size:12px;line-height:2.15}
.sb-overview-lead p+p{margin-top:12px}
.sb-outcomes{padding:18px;border-radius:20px;color:#f8fafc;background:linear-gradient(145deg,#062e33,#08404a);box-shadow:0 14px 34px rgba(3,25,29,.16)}
.sb-outcomes h3{margin:0 0 12px;font-size:17px;color:#fff}
.sb-outcomes>span{min-height:44px;padding-block:7px;display:grid;grid-template-columns:30px 1fr;align-items:center;gap:8px;border-bottom:1px solid rgba(199,222,225,.13);color:#d8e8ea;font-size:10px;line-height:1.7}
.sb-outcomes>span:last-child{border-bottom:0}
.sb-outcomes b{width:27px;height:27px;display:grid;place-items:center;border:1px solid rgba(240,206,135,.35);border-radius:9px;color:#f0ce87;background:rgba(212,155,58,.08);font-size:10px}
.sb-book-specs{margin-top:12px;display:grid;gap:8px}
.sb-book-specs>span{min-height:62px;padding:11px 13px;display:grid;align-content:center;gap:2px;border:1px solid var(--bd-border);border-radius:15px;background:var(--bd-card)}
.sb-book-specs small{color:var(--bd-muted);font-size:8px}
.sb-book-specs strong{color:var(--bd-ink);font-size:10px;line-height:1.65}

.sb-summary-section{padding-block:42px;background:color-mix(in srgb,var(--bd-primary-100) 46%,var(--bd-bg));border-block:1px solid color-mix(in srgb,var(--bd-border) 75%,transparent)}
.single-book-page[data-theme="dark"] .sb-summary-section{background:#062e33;border-color:rgba(199,222,225,.1)}
.sb-summary-head{display:grid;gap:14px}
.sb-summary-head>button{
  width:max-content;
  min-height:44px;
  padding:0 15px;
  display:flex;
  align-items:center;
  gap:7px;
  color:#fff;
  border:0;
  border-radius:12px;
  background:var(--bd-primary-700);
  font-size:10px;
  font-weight:900;
}
.sb-summary-head>button svg{width:17px;height:17px}
.sb-reading-preview{margin-top:18px;display:grid;gap:12px}
.sb-chapter-list,.sb-reading-article{border:1px solid var(--bd-border);border-radius:20px;background:var(--bd-card)}
.sb-chapter-list{padding:14px}
.sb-chapter-list>div{min-height:52px;padding:7px 9px;display:grid;grid-template-columns:36px 1fr;align-items:center;gap:8px;border-radius:13px;background:var(--bd-primary-100)}
.single-book-page[data-theme="dark"] .sb-chapter-list>div{background:var(--bd-primary-800)}
.sb-chapter-list>div>svg{width:20px;height:20px;color:var(--bd-primary-700)}
.single-book-page[data-theme="dark"] .sb-chapter-list>div>svg{color:var(--bd-primary-200)}
.sb-chapter-list>div span{display:grid}
.sb-chapter-list>div strong{font-size:11px}
.sb-chapter-list>div small{color:var(--bd-muted);font-size:8px}
.sb-chapter-list ol{max-height:238px;margin:10px 0 0;padding:0;display:grid;gap:3px;overflow:auto;list-style:none;scrollbar-width:thin}
.sb-chapter-list li{min-height:38px;padding:5px 7px;display:grid;grid-template-columns:25px 1fr;align-items:center;gap:6px;color:var(--bd-muted);border-radius:9px;font-size:9px;line-height:1.55}
.sb-chapter-list li>span{width:23px;height:23px;display:grid;place-items:center;border-radius:7px;background:var(--bd-bg);font-size:8px}
.sb-chapter-list li.is-current{color:var(--bd-primary-700);background:var(--bd-primary-100);font-weight:900}
.single-book-page[data-theme="dark"] .sb-chapter-list li.is-current{color:var(--bd-primary-100);background:var(--bd-primary-800)}

.sb-reading-article{padding:20px 18px}
.sb-reading-edition{display:inline-flex;align-items:center;gap:6px;color:var(--bd-primary-600);font-size:9px;font-weight:900}
.sb-reading-edition svg{width:15px;height:15px}
.sb-reading-article h3{margin:9px 0 12px;color:var(--bd-ink);font-size:22px;line-height:1.65}
.sb-reading-article p{margin:0;color:var(--bd-ink-soft);font-size:12px;line-height:2.18}
.sb-reading-article p+p{margin-top:12px}
.sb-reading-article>button{min-height:44px;margin-top:18px;padding:0 15px;display:flex;align-items:center;gap:7px;color:var(--bd-primary-700);border:1px solid var(--bd-primary-200);border-radius:12px;background:var(--bd-primary-50);font-size:10px;font-weight:900}
.sb-reading-article>button svg{width:15px}
.single-book-page[data-theme="dark"] .sb-reading-article>button{color:var(--bd-primary-100);border-color:rgba(199,222,225,.15);background:var(--bd-primary-800)}

.sb-pro-section{
  position:relative;
  isolation:isolate;
  margin-block:44px;
  padding:24px 20px;
  display:grid;
  gap:24px;
  overflow:hidden;
  color:#f8fafc;
  border:1px solid rgba(240,206,135,.22);
  border-radius:24px;
  background:
    radial-gradient(circle at 5% 12%,rgba(232,181,96,.13),transparent 30%),
    linear-gradient(145deg,#03191d,#062e33 62%,#08404a);
  box-shadow:0 22px 56px rgba(3,25,29,.2);
}
.sb-pro-section::after{content:"";position:absolute;inset:8px;z-index:-1;border:1px solid rgba(232,181,96,.15);border-radius:17px;pointer-events:none}
.sb-pro-mark{position:absolute;left:-8px;top:-3px;width:116px;height:90px;opacity:.16;background:#e8b560;-webkit-mask:url("../images/bookademy-redesign/brand/arrow-mark.png") center/contain no-repeat;mask:url("../images/bookademy-redesign/brand/arrow-mark.png") center/contain no-repeat}
.sb-pro-copy{position:relative;z-index:1}
.sb-pro-kicker{display:inline-flex;align-items:center;gap:6px;color:#f0ce87;font-size:10px;font-weight:900}
.sb-pro-kicker svg{width:16px;height:16px}
.sb-pro-copy h2{margin:9px 0 8px;color:#fff;font-size:25px;line-height:1.55}
.sb-pro-copy>p{margin:0;color:#c7dee1;font-size:11px;line-height:1.95}
.sb-pro-points{margin-top:15px;display:grid;gap:8px}
.sb-pro-points span{display:flex;align-items:center;gap:7px;color:#e2e8f0;font-size:10px}
.sb-pro-points svg{width:16px;height:16px;color:#e8b560}
.sb-pro-copy>button{min-height:46px;margin-top:18px;padding:0 16px;display:flex;align-items:center;gap:8px;color:#241805;border:0;border-radius:13px;background:linear-gradient(135deg,#f0ce87,#d49b3a);font-size:10px;font-weight:900;box-shadow:0 12px 28px rgba(192,138,46,.22)}
.sb-pro-copy>button svg{width:16px;height:16px}
.sb-edition-compare{position:relative;display:grid;grid-template-columns:1fr 30px 1fr;align-items:center;gap:5px}
.sb-edition-column{min-height:170px;padding:16px 12px;display:grid;justify-items:center;align-content:center;gap:6px;text-align:center;border:1px solid rgba(199,222,225,.14);border-radius:18px;background:#08404a}
.sb-edition-column.is-pro{border-color:rgba(240,206,135,.34);background:linear-gradient(160deg,#74500f,#4e3607)}
.sb-edition-column>svg{width:25px;height:25px;color:#a7ced3}
.sb-edition-column.is-pro>svg{color:#f0ce87}
.sb-edition-column span{font-size:9px;color:#c7dee1}
.sb-edition-column strong{font-size:21px;color:#fff}
.sb-edition-column small{font-size:8px;line-height:1.7;color:#a7ced3}
.sb-edition-column.is-pro small{color:#f6e1b7}
.sb-compare-arrow{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;color:#f0ce87;background:#03191d}
.sb-compare-arrow svg{width:15px}

.sb-quotes{padding-block:42px;background:var(--bd-card);border-block:1px solid var(--bd-border)}
.sb-quote-rail{margin-top:18px;display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}
.sb-quote-rail::-webkit-scrollbar{display:none}
.sb-quote-rail blockquote{position:relative;min-width:82%;min-height:180px;margin:0;padding:22px 18px;display:grid;align-content:space-between;scroll-snap-align:start;overflow:hidden;border:1px solid var(--bd-border);border-radius:20px;background:var(--bd-bg)}
.sb-quote-rail blockquote>svg{position:absolute;left:15px;top:13px;width:50px;height:50px;color:var(--bd-primary-100);stroke-width:1.3}
.single-book-page[data-theme="dark"] .sb-quote-rail blockquote>svg{color:var(--bd-primary-800)}
.sb-quote-rail p{position:relative;margin:0;color:var(--bd-ink);font-family:var(--font-heading);font-size:18px;line-height:1.85}
.sb-quote-rail small{color:var(--bd-primary-600);font-size:9px;font-weight:800}

.sb-audio-section{padding-block:48px;display:grid;gap:14px}
.sb-audio-copy,.sb-audio-state{border:1px solid var(--bd-border);border-radius:22px;background:var(--bd-card)}
.sb-audio-copy{position:relative;padding:20px 18px;overflow:hidden}
.sb-audio-icon{width:48px;height:52px;margin-bottom:13px;display:grid;place-items:center;border-radius:15px;color:var(--bd-primary-700);background:var(--bd-primary-100)}
.single-book-page[data-theme="dark"] .sb-audio-icon{color:var(--bd-primary-100);background:var(--bd-primary-800)}
.sb-audio-icon svg{width:23px;height:23px}
.sb-audio-copy>button{min-height:44px;margin-top:15px;padding:0 15px;display:flex;align-items:center;gap:7px;color:#fff;border:0;border-radius:12px;background:var(--bd-primary-700);font-size:10px;font-weight:900}
.sb-audio-copy>button svg{width:16px;height:16px}
.sb-audio-state{padding:23px 18px;display:grid;justify-items:center;align-content:center;text-align:center}
.sb-audio-state>svg{width:42px;height:42px;color:var(--bd-primary-300)}
.sb-audio-state>strong{margin-top:10px;color:var(--bd-ink);font-size:14px;line-height:1.7}
.sb-audio-state>p{margin:5px 0 0;color:var(--bd-muted);font-size:10px;line-height:1.8}
.sb-audio-state.has-audio{display:block;text-align:right}
.sb-community-audio-list{width:100%;display:grid;gap:9px}
.sb-community-audio-list article{padding:11px;display:grid;grid-template-columns:42px minmax(0,1fr);align-items:center;gap:9px;border:1px solid var(--bd-border);border-radius:14px;background:var(--bd-bg)}
.sb-community-audio-list article>img,.sb-community-audio-list article>span{width:42px;height:42px;display:grid;place-items:center;object-fit:cover;border-radius:12px;background:var(--bd-primary-100);color:var(--bd-primary-700)}
.single-book-page[data-theme="dark"] .sb-community-audio-list article>span{color:var(--bd-primary-100);background:var(--bd-primary-800)}
.sb-community-audio-list article>span svg{width:20px;height:20px}
.sb-community-audio-list article>div{display:grid;min-width:0}
.sb-community-audio-list article strong{color:var(--bd-ink);font-size:11px}
.sb-community-audio-list article small{color:var(--bd-muted);font-size:8px}
.sb-community-audio-list audio{grid-column:1/-1;width:100%;height:38px}
.sb-moderation-flow{width:100%;margin-top:18px;display:grid;grid-template-columns:1fr 12px 1fr 12px 1fr;align-items:center;gap:3px}
.sb-moderation-flow span{min-height:58px;padding:7px 3px;display:grid;justify-items:center;align-content:center;gap:4px;border-radius:12px;background:var(--bd-primary-50);color:var(--bd-ink-soft);font-size:8px}
.single-book-page[data-theme="dark"] .sb-moderation-flow span{background:var(--bd-primary-800)}
.sb-moderation-flow b{width:22px;height:22px;display:grid;place-items:center;border-radius:7px;color:var(--bd-primary-700);background:var(--bd-primary-100);font-size:8px}
.single-book-page[data-theme="dark"] .sb-moderation-flow b{color:var(--bd-primary-100);background:var(--bd-primary-700)}
.sb-moderation-flow>svg{width:12px;height:12px;color:var(--bd-muted)}

.sb-about-book{padding-block:48px;background:color-mix(in srgb,var(--bd-primary-100) 40%,var(--bd-bg));border-block:1px solid var(--bd-border)}
.single-book-page[data-theme="dark"] .sb-about-book{background:#062e33}
.sb-about-grid{display:grid;gap:18px}
.sb-about-grid article{padding:20px 18px;border:1px solid var(--bd-border);border-radius:20px;background:var(--bd-card)}
.sb-about-grid article p{margin:0;color:var(--bd-ink-soft);font-size:12px;line-height:2.2}
.sb-about-grid article p+p{margin-top:14px}

.sb-author-section{position:relative;margin-block:48px;padding:18px;display:grid;grid-template-columns:98px 1fr;align-items:center;gap:16px;overflow:hidden;color:#f8fafc;border:1px solid rgba(240,206,135,.22);border-radius:22px;background:linear-gradient(145deg,#03191d,#062e33 68%,#08404a)}
.sb-author-portrait{width:98px;aspect-ratio:1;overflow:hidden;border:2px solid rgba(240,206,135,.45);border-radius:19px;background:#08404a}
.sb-author-portrait img{width:100%;height:100%;object-fit:cover;object-position:center 18%}
.sb-author-content{position:relative;z-index:2}
.sb-author-content>span{color:#e8b560;font-size:9px;font-weight:900}
.sb-author-content h2{margin:4px 0;color:#fff;font-size:22px;line-height:1.5}
.sb-author-content p{margin:0;color:#a7ced3;font-size:9px;line-height:1.75}
.sb-author-content a{width:max-content;margin-top:9px;display:flex;align-items:center;gap:5px;color:#f0ce87;font-size:9px;font-weight:900}
.sb-author-content a svg{width:14px}
.sb-author-book{display:none}

.sb-discussion{margin-bottom:48px;padding:17px;display:grid;gap:14px;border:1px solid var(--bd-border);border-radius:20px;background:var(--bd-card)}
.sb-discussion>div{display:grid;grid-template-columns:44px 1fr;align-items:center;gap:10px}
.sb-discussion>div>svg{width:44px;height:44px;padding:11px;border-radius:13px;color:var(--bd-primary-700);background:var(--bd-primary-100)}
.single-book-page[data-theme="dark"] .sb-discussion>div>svg{color:var(--bd-primary-100);background:var(--bd-primary-800)}
.sb-discussion>div span{display:grid}
.sb-discussion strong{font-size:14px}
.sb-discussion small{color:var(--bd-muted);font-size:9px}
.sb-discussion>a{min-height:44px;padding:0 14px;display:flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--bd-primary-200);border-radius:12px;color:var(--bd-primary-700);background:var(--bd-primary-50);font-size:10px;font-weight:900}
.sb-discussion>a svg{width:15px}

.sb-faq{padding-bottom:52px}
.sb-faq-list{margin-top:18px;display:grid;gap:7px}
.sb-faq-list>div{overflow:hidden;border:1px solid var(--bd-border);border-radius:15px;background:var(--bd-card);transition:border-color .2s ease,box-shadow .2s ease}
.sb-faq-list>div.is-open{border-color:color-mix(in srgb,var(--bd-primary-500) 52%,var(--bd-border));box-shadow:var(--bd-shadow-soft)}
.sb-faq-list button{width:100%;min-height:54px;padding:10px 13px;display:grid;grid-template-columns:1fr 24px;align-items:center;gap:10px;text-align:right;color:var(--bd-ink);border:0;background:transparent;font-size:11px;font-weight:900;line-height:1.8}
.sb-faq-list button svg{width:18px;height:18px;color:var(--bd-primary-600);transition:transform .22s ease}
.sb-faq-list .is-open button svg{transform:rotate(180deg)}
.sb-faq-list p{margin:0;padding:0 13px 15px;color:var(--bd-ink-soft);font-size:10px;line-height:2}

.sb-similar{padding-bottom:54px}
.sb-similar .bd-rail-shell{margin-top:18px}
.sb-similar .bd-book-rail{max-width:250px}
.sb-similar .bd-book-card{min-width:158px;flex-basis:158px}
.sb-similar .bd-rail-controls{display:none}

.sb-reader{
  position:fixed;
  inset:0;
  z-index:150;
  display:grid;
  grid-template-rows:64px minmax(0,1fr);
  color:var(--bd-ink);
  background:var(--bd-bg);
  animation:sb-reader-in .28s cubic-bezier(.22,1,.36,1) both;
}
.sb-reader.is-theme-light{
  --bd-ink:#142829;
  --bd-ink-soft:#334b4c;
  --bd-muted:#647779;
  --bd-border:#e1e6e3;
  --bd-card:#ffffff;
  --bd-bg:#f7f9f8;
  --bd-shadow:0 16px 45px rgba(6,46,51,.08);
  color-scheme:light;
}
.sb-reader.is-theme-paper{
  --bd-ink:#342d24;
  --bd-ink-soft:#51483a;
  --bd-muted:#766b59;
  --bd-border:#ded2bd;
  --bd-card:#fffaf0;
  --bd-bg:#f2ebdd;
  --bd-shadow:0 16px 45px rgba(78,54,7,.1);
  color-scheme:light;
}
.sb-reader.is-theme-dark{
  --bd-primary-50:#08404a;
  --bd-primary-100:#08404a;
  --bd-primary-200:#0a4d56;
  --bd-primary-300:#5fa8b0;
  --bd-primary-600:#a7ced3;
  --bd-primary-700:#c7dee1;
  --bd-ink:#f8fafc;
  --bd-ink-soft:#e2e8f0;
  --bd-muted:#a9bdc1;
  --bd-border:rgba(199,222,225,.15);
  --bd-card:#062e33;
  --bd-bg:#03191d;
  --bd-shadow:0 18px 48px rgba(0,0,0,.26);
  color-scheme:dark;
}
.sb-reader-body>main,
.sb-reader-body>main h1,
.sb-reader-body>main article,
.sb-reader-body>main button,
.sb-reader-body>aside,
.sb-reader-body>aside button,
.sb-reader-body>aside strong,
.sb-reader-book-title,
.sb-reader-book-title strong{font-family:var(--reader-font)!important}
.sb-reader-progress{position:absolute;inset:62px 0 auto;z-index:8;height:2px;background:var(--bd-border);pointer-events:none}
.sb-reader-progress::after{content:"";position:absolute;inset:0 auto 0 0;width:var(--reader-progress);background:linear-gradient(90deg,var(--bd-primary-500),var(--bd-accent-500));transition:width .3s ease}
.sb-reader-header{
  position:relative;
  z-index:7;
  height:64px;
  padding:8px 10px;
  display:grid;
  grid-template-columns:44px 44px minmax(0,1fr) auto 88px;
  align-items:center;
  gap:5px;
  border-bottom:1px solid var(--bd-border);
  background:var(--bd-card);
  box-shadow:0 6px 20px color-mix(in srgb,var(--bd-primary-950) 7%,transparent);
}
.sb-reader-header button{width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--bd-border);border-radius:13px;color:var(--bd-ink);background:var(--bd-bg);transition:color .2s ease,border-color .2s ease,background .2s ease}
.sb-reader-header button:hover,.sb-reader-header button.is-active{color:var(--bd-primary-700);border-color:var(--bd-primary-300);background:var(--bd-primary-100)}
.sb-reader-header button svg{width:19px;height:19px}
.sb-reader-book-title{display:grid;min-width:0}
.sb-reader-book-title small{color:var(--bd-primary-600);font-size:8px;font-weight:900}
.sb-reader.is-pro .sb-reader-book-title small{color:var(--bd-accent-500)}
.single-book-page[data-theme="dark"] .sb-reader:not(.is-pro) .sb-reader-book-title small,
.sb-reader.is-theme-dark:not(.is-pro) .sb-reader-book-title small{color:var(--bd-primary-300)}
.sb-reader-book-title strong{overflow:hidden;font-size:10px;white-space:nowrap;text-overflow:ellipsis}
.sb-reader-count{padding:6px 7px;border-radius:8px;color:var(--bd-muted);background:var(--bd-bg);font-size:8px;white-space:nowrap}
.sb-reader-tools{display:grid;grid-template-columns:44px 44px;gap:0}
.sb-reader-toc-trigger{display:grid}
.sb-reader-settings{
  position:fixed;
  top:70px;
  left:10px;
  right:10px;
  z-index:160;
  max-height:calc(100dvh - 84px);
  padding:14px;
  display:grid;
  gap:10px;
  overflow:auto;
  overscroll-behavior:contain;
  border:1px solid var(--bd-border);
  border-radius:18px;
  background:var(--bd-card);
  box-shadow:0 22px 60px rgba(3,25,29,.22);
  animation:sb-settings-in .2s ease both;
}
.sb-reader-settings>header{min-height:44px;display:grid;grid-template-columns:34px 1fr 44px;align-items:center;gap:8px}
.sb-reader-settings>header>svg{width:20px;color:var(--bd-primary-600)}
.sb-reader-settings>header>span{display:grid}
.sb-reader-settings>header strong{font-size:12px}
.sb-reader-settings>header small{color:var(--bd-muted);font-size:8px}
.sb-reader-settings>header button,.sb-setting-row button{min-width:44px;min-height:44px;display:grid;place-items:center;border:1px solid var(--bd-border);border-radius:11px;color:var(--bd-ink);background:var(--bd-bg)}
.sb-reader-settings>header button svg,.sb-setting-row button svg{width:17px;height:17px}
.sb-reader-setting-block{padding-top:9px;display:grid;gap:8px;border-top:1px solid var(--bd-border)}
.sb-reader-setting-block>span{display:flex;align-items:center;gap:7px;color:var(--bd-ink-soft);font-size:10px;font-weight:800}
.sb-reader-setting-block>span svg{width:17px;color:var(--bd-primary-600)}
.sb-reader-theme-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
.sb-reader-theme-options button{min-width:0;min-height:58px;padding:7px 5px;display:grid;grid-template-columns:20px minmax(0,1fr);align-items:center;gap:5px;text-align:right;color:var(--bd-muted);border:1px solid var(--bd-border);border-radius:11px;background:var(--bd-bg);font-size:9px;font-weight:800;transition:border-color .2s ease,background .2s ease,transform .2s ease}
.sb-reader-theme-options button:hover{transform:translateY(-1px)}
.sb-reader-theme-options button.is-active{color:var(--bd-ink);border-color:var(--bd-primary-500);background:color-mix(in srgb,var(--bd-primary-100) 64%,var(--bd-card))}
.sb-reader-theme-options i{width:20px;height:30px;display:block;border:1px solid rgba(20,40,41,.16);border-radius:6px;box-shadow:inset 0 0 0 3px rgba(255,255,255,.18)}
.sb-reader-theme-options i.is-light{background:linear-gradient(180deg,#fff 0 30%,#f7f9f8 30%)}
.sb-reader-theme-options i.is-paper{background:linear-gradient(180deg,#fffaf0 0 30%,#e8dcc7 30%)}
.sb-reader-theme-options i.is-dark{border-color:rgba(255,255,255,.14);background:linear-gradient(180deg,#08404a 0 30%,#03191d 30%)}
.sb-reader-font-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}
.sb-reader-font-options button{min-width:0;min-height:52px;padding:6px 8px;display:grid;grid-template-columns:30px minmax(0,1fr);align-items:center;gap:7px;text-align:right;color:var(--bd-muted);border:1px solid var(--bd-border);border-radius:11px;background:var(--bd-bg);font-size:9px;transition:border-color .2s ease,background .2s ease,transform .2s ease}
.sb-reader-font-options button:hover{transform:translateY(-1px)}
.sb-reader-font-options button.is-active{color:var(--bd-ink);border-color:var(--bd-primary-500);background:color-mix(in srgb,var(--bd-primary-100) 64%,var(--bd-card))}
.sb-reader-font-options b{width:30px;height:30px;display:grid;place-items:center;border-radius:8px;color:var(--bd-primary-700);background:var(--bd-card);font-family:var(--font-preview)!important;font-size:16px}
.sb-reader-font-options span{overflow:hidden;font-family:var(--font-preview)!important;font-weight:700;white-space:nowrap;text-overflow:ellipsis}
.sb-setting-row{min-height:52px;padding-top:8px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;border-top:1px solid var(--bd-border)}
.sb-setting-row>span{display:flex;align-items:center;gap:7px;color:var(--bd-ink-soft);font-size:10px;font-weight:800}
.sb-setting-row>span svg{width:17px;color:var(--bd-primary-600)}
.sb-setting-row>div{display:flex;align-items:center;gap:5px}
.sb-setting-row b{min-width:44px;color:var(--bd-ink);font-size:9px;text-align:center}
.sb-setting-segment{padding:3px;gap:2px!important;border-radius:12px;background:var(--bd-bg)}
.sb-setting-segment button{min-width:66px;min-height:38px;border:0;background:transparent;font-size:9px;font-weight:800}
.sb-setting-segment button.is-active{color:#fff;background:var(--bd-primary-700)}
.sb-reader-body{position:relative;min-height:0;overflow:hidden}
.sb-reader-toc-backdrop{position:absolute;inset:0;z-index:8;width:100%;height:100%;border:0;background:rgba(3,25,29,.54);opacity:0;pointer-events:none;transition:opacity .24s ease}
.sb-reader-toc-backdrop.is-open{opacity:1;pointer-events:auto}
.sb-reader-body>aside{
  position:absolute;
  inset:0 0 0 auto;
  z-index:9;
  width:min(86vw,340px);
  padding:16px 14px 28px;
  overflow:auto;
  border-left:1px solid var(--bd-border);
  background:var(--bd-card);
  box-shadow:-20px 0 55px rgba(3,25,29,.2);
  transform:translateX(105%);
  transition:transform .28s cubic-bezier(.22,1,.36,1);
}
.sb-reader-body>aside.is-open{transform:none}
.sb-reader-toc-head{min-height:52px;display:grid;grid-template-columns:32px 1fr 44px;align-items:center;gap:8px}
.sb-reader-toc-head>svg{width:21px;color:var(--bd-primary-600)}
.sb-reader-toc-head>span{display:grid}
.sb-reader-toc-head strong{font-size:13px}
.sb-reader-toc-head small{color:var(--bd-muted);font-size:8px}
.sb-reader-toc-head>button{width:44px;height:44px;display:grid;place-items:center;border:1px solid var(--bd-border);border-radius:12px;color:var(--bd-ink);background:var(--bd-bg)}
.sb-reader-toc-head>button svg{width:17px}
.sb-reader-body>aside ol{margin:13px 0 0;padding:0;display:grid;gap:5px;list-style:none}
.sb-reader-body>aside li{min-width:0}
.sb-reader-body>aside li>button{width:100%;min-height:54px;padding:7px 8px;display:grid;grid-template-columns:30px minmax(0,1fr) 16px;align-items:center;gap:8px;text-align:right;color:var(--bd-muted);border:1px solid transparent;border-radius:12px;background:transparent;font-size:10px;line-height:1.65}
.sb-reader-body>aside li>button>span{width:28px;height:28px;display:grid;place-items:center;border-radius:8px;background:var(--bd-bg);font-size:8px}
.sb-reader-body>aside li>button>strong{font-weight:750}
.sb-reader-body>aside li>button>svg{width:13px;color:var(--bd-primary-600)}
.sb-reader-body>aside li.is-active>button{color:var(--bd-primary-700);border-color:var(--bd-primary-300);background:var(--bd-primary-100);font-weight:900}
.sb-reader.is-pro .sb-reader-body>aside li.is-active>button{color:#2d1c04;border-color:#e8b560;background:#f6e1b7}
.sb-reader-body>main{height:100%;max-width:760px;margin-inline:auto;padding:32px 20px 90px;overflow:auto;scrollbar-gutter:stable}
.sb-reader-label{display:inline-flex;padding:5px 9px;border-radius:999px;color:var(--bd-primary-700);background:var(--bd-primary-100);font-size:9px;font-weight:900}
.sb-reader.is-pro .sb-reader-label{color:#2d1c04;background:#f6e1b7}
.sb-reader-body>main h1{margin:12px 0 22px;color:var(--bd-ink);font-size:30px;line-height:1.55}
.sb-reader-body article{font-size:calc(14px * var(--reader-scale));line-height:var(--reader-leading)}
.sb-reader-body article p{margin:0;color:var(--bd-ink-soft);font-size:inherit;line-height:inherit}
.sb-reader-body article p+p{margin-top:calc(17px * var(--reader-scale))}
.sb-reader-placeholder{min-height:240px;padding:26px 20px;display:grid;justify-items:center;align-content:center;text-align:center;border:1px dashed var(--bd-border);border-radius:20px;background:var(--bd-card)}
.sb-reader-placeholder>svg{width:42px;height:42px;color:var(--bd-primary-400)}
.sb-reader-placeholder strong{margin-top:12px;font-size:15px}
.sb-reader-placeholder p{max-width:480px;margin:6px 0 0;color:var(--bd-muted);font-size:10px;line-height:1.9}
.sb-reader-chapter-nav{margin-top:34px;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.sb-reader-chapter-nav>button{min-width:0;min-height:68px;padding:10px;display:grid;grid-template-columns:20px minmax(0,1fr);align-items:center;gap:7px;text-align:right;color:var(--bd-ink);border:1px solid var(--bd-border);border-radius:14px;background:var(--bd-card)}
.sb-reader-chapter-nav>button:last-child{grid-template-columns:minmax(0,1fr) 20px;text-align:left}
.sb-reader-chapter-nav>button>svg{width:17px;color:var(--bd-primary-600)}
.sb-reader-chapter-nav>button>span{display:grid;min-width:0}
.sb-reader-chapter-nav small{color:var(--bd-muted);font-size:8px}
.sb-reader-chapter-nav strong{overflow:hidden;font-size:9px;white-space:nowrap;text-overflow:ellipsis}
.sb-reader-chapter-nav>button:disabled{opacity:.38;cursor:not-allowed}
.sb-reader-note{margin-top:18px;padding:14px;display:grid;grid-template-columns:38px 1fr;gap:10px;border:1px solid var(--bd-border);border-radius:15px;background:var(--bd-card)}
.sb-reader-note>svg{width:38px;height:38px;padding:9px;border-radius:11px;color:var(--bd-primary-700);background:var(--bd-primary-100)}
.sb-reader-note p{margin:0;display:grid}
.sb-reader-note strong{font-size:10px}
.sb-reader-note span{color:var(--bd-muted);font-size:9px;line-height:1.7}

.sb-sheet-shell{position:fixed;inset:0;z-index:160;display:flex;align-items:flex-end;justify-content:center}
.sb-sheet-backdrop{position:absolute;inset:0;width:100%;height:100%;border:0;background:rgba(3,25,29,.62)}
.sb-sheet{position:relative;width:100%;max-width:600px;max-height:88vh;padding:24px 18px calc(24px + env(safe-area-inset-bottom));overflow:auto;border-radius:24px 24px 0 0;color:var(--bd-ink);background:var(--bd-bg);box-shadow:0 -20px 70px rgba(0,0,0,.3);animation:sb-sheet-up .3s cubic-bezier(.22,1,.36,1) both}
.sb-sheet-close{position:absolute;left:14px;top:14px;width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--bd-border);border-radius:12px;color:var(--bd-ink);background:var(--bd-card)}
.sb-sheet-close svg{width:18px}
.sb-sheet-icon{width:54px;height:58px;display:grid;place-items:center;border-radius:16px;color:var(--bd-primary-700);background:var(--bd-primary-100)}
.single-book-page[data-theme="dark"] .sb-sheet-icon{color:var(--bd-primary-100);background:var(--bd-primary-800)}
.sb-sheet-icon svg{width:26px;height:26px}
.sb-sheet h2{margin:15px 0 7px;font-size:24px;line-height:1.55}
.sb-sheet>p{margin:0;color:var(--bd-muted);font-size:11px;line-height:1.95}
.sb-sheet-options{margin-top:17px;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.sb-sheet-options>span{min-height:112px;padding:13px;display:grid;align-content:center;gap:4px;border:1px solid var(--bd-border);border-radius:15px;background:var(--bd-card)}
.sb-sheet-options svg{width:22px;color:var(--bd-primary-600)}
.sb-sheet-options strong{font-size:11px}
.sb-sheet-options small{color:var(--bd-muted);font-size:8px;line-height:1.65}
.sb-sheet ul{margin:16px 0 0;padding:0;display:grid;gap:7px;list-style:none}
.sb-sheet li{display:flex;align-items:center;gap:7px;color:var(--bd-ink-soft);font-size:10px}
.sb-sheet li svg{width:15px;color:var(--bd-primary-600)}
.sb-sheet>a{min-height:48px;margin-top:18px;padding:0 16px;display:flex;align-items:center;justify-content:center;gap:7px;border-radius:13px;color:#fff;background:var(--bd-primary-700);font-size:10px;font-weight:900}
.sb-sheet>a svg{width:16px}

@keyframes sb-reader-in{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
@keyframes sb-settings-in{from{opacity:0;transform:translateY(-8px) scale(.98)}to{opacity:1;transform:none}}
@keyframes sb-sheet-up{from{transform:translateY(100%)}to{transform:none}}

@media (min-width:601px){
  .sb-hero-wrap{padding-top:16px}
  .sb-breadcrumb{min-height:42px;font-size:10px}
  .sb-hero{padding:36px;grid-template-columns:220px minmax(0,1fr);justify-items:stretch;gap:30px;border-radius:28px}
  .sb-hero::after{inset:9px;border-radius:20px}
  .sb-cover-stage{width:220px}
  .sb-cover-pro{min-height:30px;padding-inline:9px;font-size:9px}
  .sb-hero-copy{text-align:right}
  .sb-hero-kickers{justify-content:flex-start}
  .sb-hero h1{font-size:38px}
  .sb-subtitle{font-size:12px}
  .sb-author-inline{min-height:44px;margin-inline:0;grid-template-columns:34px minmax(0,1fr) 16px}
  .sb-author-inline img{width:34px;height:34px}
  .sb-author-inline strong{font-size:11px}
  .sb-hero-summary{display:block;margin:15px 0 0;max-width:670px;color:#c7dee1;font-size:12px;line-height:2}
  .sb-hero-actions{width:max-content;margin-top:12px;grid-template-columns:190px 190px;gap:10px}
  .sb-hero-actions button{height:58px}
  .sb-action-standard strong,.sb-action-pro strong{font-size:11px}
  .sb-action-standard small,.sb-action-pro small{font-size:8px}
  .sb-facts{grid-column:1/-1}
  .sb-fact{min-width:150px;flex:1}
  .sb-section-title h2{font-size:30px}
  .sb-section-title p{font-size:12px}
  .sb-overview{padding-block:60px 48px}
  .sb-overview-grid{grid-template-columns:minmax(0,1.35fr) minmax(250px,.65fr);gap:16px}
  .sb-overview-lead{padding:27px 25px}
  .sb-overview-lead p{font-size:13px}
  .sb-outcomes{padding:24px}
  .sb-outcomes h3{font-size:20px}
  .sb-outcomes>span{font-size:11px}
  .sb-book-specs{grid-template-columns:1.1fr .65fr 1.25fr}
  .sb-summary-section{padding-block:56px}
  .sb-summary-head{grid-template-columns:1fr auto;align-items:end}
  .sb-reading-preview{grid-template-columns:280px minmax(0,1fr);gap:16px}
  .sb-chapter-list ol{max-height:520px}
  .sb-reading-article{padding:30px}
  .sb-reading-article h3{font-size:28px}
  .sb-reading-article p{font-size:13px}
  .sb-pro-section{padding:38px;grid-template-columns:minmax(0,1.1fr) minmax(310px,.9fr);align-items:center;gap:38px}
  .sb-pro-copy h2{font-size:33px}
  .sb-pro-copy>p{font-size:12px}
  .sb-pro-points{grid-template-columns:1fr 1fr}
  .sb-edition-column{min-height:220px}
  .sb-quote-rail blockquote{min-width:42%}
  .sb-audio-section{grid-template-columns:.85fr 1.15fr;gap:16px;padding-block:62px}
  .sb-audio-copy,.sb-audio-state{padding:28px}
  .sb-about-grid{grid-template-columns:.65fr 1.35fr;gap:34px;align-items:start}
  .sb-about-grid article{padding:28px}
  .sb-about-grid article p{font-size:13px}
  .sb-author-section{padding:26px;grid-template-columns:150px 1fr 120px;gap:28px}
  .sb-author-portrait{width:150px;border-radius:24px}
  .sb-author-content h2{font-size:31px}
  .sb-author-content p{font-size:11px}
  .sb-author-book{display:block;justify-self:end;width:92px;transform:rotate(-5deg);filter:drop-shadow(0 14px 22px rgba(0,0,0,.35))}
  .sb-author-book img{width:100%;border-radius:6px}
  .sb-discussion{grid-template-columns:1fr auto;align-items:center}
  .sb-discussion>a{min-width:170px}
  .sb-faq-list{grid-template-columns:1fr 1fr;align-items:start}
  .sb-similar .bd-book-rail{max-width:320px}
  .sb-similar .bd-book-card{min-width:180px;flex-basis:180px}
  .sb-reader{grid-template-rows:72px minmax(0,1fr)}
  .sb-reader-progress{inset-block-start:70px}
  .sb-reader-header{height:72px;padding-inline:18px;grid-template-columns:44px minmax(0,1fr) auto 96px;gap:9px}
  .sb-reader-toc-trigger{display:none!important}
  .sb-reader-book-title strong{font-size:12px}
  .sb-reader-count{padding-inline:10px;font-size:9px}
  .sb-reader-settings{top:80px;right:auto;left:20px;width:360px;padding:17px}
  .sb-reader-body{display:grid;grid-template-columns:300px minmax(0,1fr);overflow:hidden}
  .sb-reader-toc-backdrop{display:none}
  .sb-reader-body>aside{position:relative;inset:auto;z-index:1;width:auto;min-height:0;padding:20px;overflow:auto;border-bottom:0;border-left:1px solid var(--bd-border);box-shadow:none;transform:none}
  .sb-reader-toc-head{grid-template-columns:32px 1fr}
  .sb-reader-toc-head>button{display:none}
  .sb-reader-body>aside ol{display:grid;overflow:visible}
  .sb-reader-body>aside li{min-width:0}
  .sb-reader-body>main{width:100%;max-width:820px;overflow:auto;padding:54px 54px 100px}
  .sb-reader-body>main h1{font-size:38px}
  .sb-reader-body article{font-size:calc(15px * var(--reader-scale))}
  .sb-reader.is-wide .sb-reader-body{grid-template-columns:260px minmax(0,1fr)}
  .sb-reader.is-wide .sb-reader-body>main{max-width:1080px}
  .sb-reader-chapter-nav>button{min-height:78px;padding:13px}
  .sb-sheet-shell{align-items:center;padding:24px}
  .sb-sheet{border-radius:24px;padding:30px}
}

@media (min-width:1024px){
  .sb-hero-wrap{padding-top:18px}
  .sb-breadcrumb{min-height:48px;font-size:11px}
  .sb-hero{min-height:0;padding:48px 62px;grid-template-columns:350px minmax(0,1fr);grid-template-rows:auto auto;align-items:start;gap:24px 66px;border-radius:32px}
  .sb-hero::after{inset:11px;border-radius:23px}
  .sb-hero-mark{left:30px;top:25px;width:170px;height:132px;opacity:.14}
  .sb-cover-stage{width:324px}
  .sb-cover-pro{left:14px;top:24px;min-height:36px;padding-inline:12px;font-size:10px}
  .sb-hero-copy{align-self:start;padding-top:0}
  .sb-hero-kickers a,.sb-hero-kickers span{min-height:32px;padding-inline:11px;font-size:10px}
  .sb-hero h1{max-width:760px;margin-top:14px;font-size:52px;line-height:1.38}
  .sb-subtitle{font-size:14px}
  .sb-author-inline{margin-top:14px}
  .sb-author-inline small{font-size:8px}
  .sb-author-inline strong{font-size:12px}
  .sb-hero-summary{margin-top:15px;max-width:760px;font-size:14px;line-height:2.05}
  .sb-hero-actions{margin-top:10px;grid-template-columns:220px 220px}
  .sb-action-standard strong,.sb-action-pro strong{font-size:12px}
  .sb-action-standard small,.sb-action-pro small{font-size:9px}
  .sb-facts{grid-column:1/-1;gap:10px;padding-top:18px}
  .sb-fact{min-height:66px;padding:10px 13px;grid-template-columns:38px 1fr;border-radius:15px}
  .sb-fact>svg{width:21px;height:21px}
  .sb-fact strong{font-size:13px}
  .sb-fact small{font-size:9px}
  .sb-section-nav{top:76px}
  .sb-section-nav .bd-container{justify-content:center;gap:8px;padding-block:9px}
  .sb-section-nav button{min-height:42px;padding-inline:18px;font-size:11px}
  .sb-section-title>span{font-size:12px}
  .sb-section-title h2{font-size:37px}
  .sb-section-title p{font-size:13px}
  .sb-overview{padding-block:76px 62px}
  .sb-overview-grid{margin-top:26px;gap:22px}
  .sb-overview-lead{padding:34px;border-radius:25px}
  .sb-overview-lead p{font-size:15px;line-height:2.2}
  .sb-outcomes{padding:30px;border-radius:25px}
  .sb-outcomes h3{font-size:24px}
  .sb-outcomes>span{min-height:54px;font-size:13px}
  .sb-book-specs{margin-top:18px;gap:12px}
  .sb-book-specs>span{min-height:76px;padding:14px 18px}
  .sb-book-specs small{font-size:10px}
  .sb-book-specs strong{font-size:12px}
  .sb-summary-section{padding-block:74px}
  .sb-reading-preview{margin-top:28px;grid-template-columns:330px minmax(0,1fr);gap:22px}
  .sb-chapter-list,.sb-reading-article{border-radius:24px}
  .sb-chapter-list{padding:18px}
  .sb-chapter-list li{min-height:44px;font-size:10px}
  .sb-reading-article{padding:42px 46px}
  .sb-reading-article h3{font-size:34px}
  .sb-reading-article p{font-size:15px;line-height:2.24}
  .sb-pro-section{margin-block:72px;padding:54px 62px;gap:70px;border-radius:30px}
  .sb-pro-copy h2{font-size:41px}
  .sb-pro-copy>p{font-size:14px}
  .sb-pro-points span{font-size:12px}
  .sb-pro-copy>button{min-height:50px;font-size:12px}
  .sb-edition-column{min-height:250px;padding:24px}
  .sb-edition-column>svg{width:32px;height:32px}
  .sb-edition-column span{font-size:11px}
  .sb-edition-column strong{font-size:29px}
  .sb-edition-column small{font-size:10px}
  .sb-quotes{padding-block:68px}
  .sb-quote-rail{margin-top:27px;gap:14px}
  .sb-quote-rail blockquote{min-width:31.8%;min-height:230px;padding:30px 26px}
  .sb-quote-rail p{font-size:23px}
  .sb-quote-rail small{font-size:11px}
  .sb-audio-section{padding-block:74px;gap:22px}
  .sb-audio-copy,.sb-audio-state{padding:38px;border-radius:26px}
  .sb-audio-icon{width:62px;height:68px}
  .sb-audio-copy>button{min-height:48px;font-size:11px}
  .sb-audio-state>strong{font-size:18px}
  .sb-audio-state>p{font-size:12px}
  .sb-moderation-flow span{min-height:74px;font-size:10px}
  .sb-about-book{padding-block:74px}
  .sb-about-grid{gap:64px}
  .sb-about-grid article{padding:38px 42px;border-radius:25px}
  .sb-about-grid article p{font-size:15px;line-height:2.3}
  .sb-author-section{margin-block:72px;padding:36px 44px;grid-template-columns:220px 1fr 150px;gap:44px;border-radius:28px}
  .sb-author-portrait{width:220px;border-radius:30px}
  .sb-author-content>span{font-size:11px}
  .sb-author-content h2{font-size:42px}
  .sb-author-content p{font-size:13px}
  .sb-author-content a{font-size:11px}
  .sb-author-book{width:120px}
  .sb-discussion{margin-bottom:72px;padding:24px 28px;border-radius:23px}
  .sb-discussion strong{font-size:18px}
  .sb-discussion small{font-size:11px}
  .sb-faq{padding-bottom:76px}
  .sb-faq-list{margin-top:26px;gap:10px}
  .sb-faq-list button{min-height:66px;padding-inline:18px;font-size:13px}
  .sb-faq-list p{padding:0 18px 20px;font-size:12px}
  .sb-similar{padding-bottom:76px}
  .sb-similar .bd-book-rail{max-width:350px}
  .sb-similar .bd-book-card{min-width:205px;flex-basis:205px}
}

@media (max-width:380px){
  .sb-hero{padding:20px 14px 15px;grid-template-columns:minmax(0,1fr);gap:15px}
  .sb-cover-stage{width:174px}
  .sb-hero h1{font-size:26px}
  .sb-hero-actions{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:7px}
  .sb-action-standard,.sb-action-pro{padding-inline:8px;gap:6px}
  .sb-action-standard strong,.sb-action-pro strong{font-size:9px}
  .sb-action-standard small,.sb-action-pro small{font-size:6px}
  .sb-fact{min-width:108px}
  .sb-moderation-flow span{font-size:7px}
}

@media (prefers-reduced-motion:reduce){
  .sb-reader,.sb-sheet{animation:none!important}
}