/* J49B editorial system — warm paper, black type, cobalt signal, ruled grid */
:root{
  --paper:#f7f7f5!important;--paper-soft:#f7f7f5!important;--paper-deep:#eeeeeb!important;
  --paper-dark:#f7f7f5!important;--ink:#090909!important;--ink-soft:#242424!important;
  --muted:#727272!important;--muted-soft:#92928e!important;--rule:#ddddda!important;
  --rule-strong:#bdbdb8!important;--accent:#0648bd!important;--accent-hover:#003d9f!important;
  --accent-deep:#003480!important;--accent-soft:#2d67c8!important;--on-dark:#090909!important;
  --on-dark-muted:#727272!important;--on-dark-soft:#92928e!important;
  --sans:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Noto Sans SC","Hiragino Sans GB","Microsoft YaHei",sans-serif!important;
  --sans-zh:var(--sans)!important;--sans-condensed:var(--sans)!important;--serif:var(--sans)!important;
  --mono:"Helvetica Neue",Helvetica,Arial,ui-monospace,monospace!important;
  --l1:#d2a106!important;--l2:#198038!important;--l3:#0f62fe!important;--l4:#007d79!important;
  --l5:#6929c4!important;--l6:#d02670!important;--l7:#b28600!important;--l8:#a2191f!important;
  --l1-tint:rgba(241,194,27,.10)!important;--l2-tint:rgba(36,161,72,.10)!important;
  --l3-tint:rgba(15,98,254,.10)!important;--l4-tint:rgba(0,157,154,.10)!important;
  --l5-tint:rgba(138,63,252,.10)!important;--l6-tint:rgba(238,83,150,.10)!important;
  --l7-tint:rgba(255,131,43,.10)!important;--l8-tint:rgba(218,30,40,.10)!important;
}
*{border-radius:0!important;box-shadow:none!important}
body{background:var(--paper)!important;color:var(--ink)!important;font-family:var(--sans)!important;font-weight:400!important;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums}
a{color:inherit}::selection{background:var(--accent)!important;color:#fff}
/* shared chrome */
.appbar,.topbar{background:color-mix(in srgb,var(--paper) 95%,transparent)!important;color:var(--ink)!important;border-bottom:1px solid var(--ink)!important;backdrop-filter:blur(10px)}
.appbar .brand,.appbar .brand .sub,.appbar .nav a,.topbar .home,.topbar .label{color:var(--ink)!important}.appbar .brand::before,.topbar .home::before{background:var(--accent)!important}.appbar .nav a:hover{background:var(--paper-deep)!important;color:var(--accent)!important}
/* homepage */
.hero{background:var(--paper)!important;color:var(--ink)!important;padding:72px 0 0!important;border-bottom:0!important}.hero-ink{display:none!important}.hero::after{display:none!important}.hero-inner{max-width:1120px!important;padding:0 24px!important;grid-template-columns:repeat(12,1fr)!important;gap:20px!important}.hero-eyebrow{grid-column:1/-1!important;color:var(--accent)!important;font:700 11px/1.4 var(--sans)!important;letter-spacing:.18em!important;text-transform:uppercase!important;margin-bottom:8px!important;padding-left:0!important;border-left:0!important}.hero-title{grid-column:1/-1!important;font:400 clamp(54px,10vw,112px)/1 var(--sans)!important;letter-spacing:-.055em!important;color:var(--ink)!important;margin:0 0 20px!important}.hero-period{color:var(--accent)!important}.hero-sub{grid-column:1/span 10!important;font:400 clamp(18px,2.2vw,27px)/1.3 var(--sans)!important;color:var(--ink)!important;font-style:normal!important;letter-spacing:-.025em!important;border-left:4px solid var(--accent);padding-left:14px}.hero-tag{grid-column:1/span 9!important;color:var(--muted)!important;font-size:15px!important;margin-bottom:34px!important}.hero-cta{border-top:1px solid var(--ink);border-bottom:1px solid var(--rule);padding:14px 0!important}.cta-pill{background:none!important;color:var(--ink)!important;border-right:1px solid var(--rule)!important;padding:10px 18px!important;min-width:0!important;font-size:12px!important;letter-spacing:.06em!important;text-transform:uppercase}.cta-pill:first-child{padding-left:0!important}.cta-pill:hover{color:var(--accent)!important;text-decoration:none!important}
.preface,.stat-strip,.stack,.flow-section{background:var(--paper)!important;color:var(--ink)!important}.preface-inner,.stat-grid,.stack-inner,.flow-inner,.footer-inner{max-width:1120px!important}.preface{padding:64px 0!important;border-bottom:1px solid var(--ink)!important}.preface-body{font-family:var(--sans)!important;color:var(--ink-soft)!important;font-size:18px!important;line-height:1.75!important}.stat-strip{border-bottom:1px solid var(--ink)!important}.stat-grid{gap:0!important}.stat{border-right:1px solid var(--rule)!important;background:none!important}.stat strong{font:300 clamp(34px,5vw,64px)/1 var(--sans)!important;letter-spacing:-.055em!important;color:var(--ink)!important}.stat span{color:var(--muted)!important;font-size:11px!important;letter-spacing:.1em!important;text-transform:uppercase}.stack-head,.flow-head{border-bottom:1px solid var(--ink)!important}.stack-head-text h2,.flow-head h2{font-weight:400!important;letter-spacing:-.035em!important}.layer{background:none!important;border:0!important;border-bottom:1px solid var(--rule)!important}.layer-num{font:300 clamp(42px,6vw,76px)/1 var(--sans)!important;color:var(--accent)!important}.layer-name{font-weight:500!important}.layer-role,.layer-en{color:var(--muted)!important}.book{background:none!important;border:0!important;border-top:1px solid var(--rule)!important}.book:hover{background:var(--paper-deep)!important}.book h3{font-weight:500!important}.footer-inner{color:var(--muted)!important}
/* book pages */
.layout{max-width:1320px!important}.toc-side{background:#f1f1ee!important;border-right:1px solid var(--rule)!important}.toc-side h4{color:var(--accent)!important;border-top:1px solid var(--ink)!important;font-family:var(--sans)!important;letter-spacing:.12em!important}.toc-side .toc-section,.toc-side .toc-part,.toc-side .toc-chap{color:var(--ink-soft)!important}.toc-side a.active,.toc-side a:hover{background:var(--paper)!important;color:var(--accent)!important;border-left-color:var(--accent)!important}.reader{background:var(--paper)!important;max-width:none!important;padding-top:54px!important}.book-head{border-bottom:1px solid var(--ink)!important;padding-bottom:36px!important;margin-bottom:54px!important}.book-head .layer-badge{color:var(--accent)!important;font:700 11px/1.4 var(--sans)!important;letter-spacing:.16em!important;text-transform:uppercase!important}.book-head h1{font:400 clamp(42px,7vw,78px)/1.05 var(--sans)!important;letter-spacing:-.055em!important;color:var(--ink)!important}.book-head .subtitle{font:400 clamp(17px,2vw,23px)/1.5 var(--sans)!important;color:var(--ink)!important;border-left:4px solid var(--accent);padding-left:14px!important}.book-head .role{color:var(--muted)!important}.reader h2{font:400 clamp(30px,4vw,48px)/1.15 var(--sans)!important;letter-spacing:-.035em!important;color:var(--ink)!important;border-top:1px solid var(--ink)!important;padding-top:24px!important}.reader h2::before,.reader h5::before{color:var(--accent)!important}.reader h3,.reader h4,.reader h5,.reader h6{font-family:var(--sans)!important;color:var(--ink)!important}.reader h3{font-weight:500!important;letter-spacing:-.02em!important}.reader p,.reader li{font-family:var(--sans)!important;color:var(--ink-soft)!important;line-height:1.9!important}.reader p{font-size:18px!important;text-indent:0!important}.reader p.callout,.reader p.core,.reader blockquote{background:none!important;border:1px solid var(--rule)!important;border-left:3px solid var(--accent)!important;color:var(--ink)!important}.reader table{border-top:1px solid var(--ink)!important}.reader th,.reader td{border-bottom:1px solid var(--rule)!important}.reader th{font-family:var(--sans)!important;font-size:11px!important;letter-spacing:.1em!important;text-transform:uppercase!important}.book-foot{border-top:1px solid var(--ink)!important}
.mark-toolbar,.notes-panel,.note-modal-inner{background:var(--paper)!important;color:var(--ink)!important;border-color:var(--rule)!important}.notes-fab{background:var(--accent)!important}
/* about page — same restrained editorial grammar */
.about-hero{background:var(--paper)!important;padding:72px 0 56px!important;border-bottom:1px solid var(--ink)!important}.about-hero-inner{max-width:1120px!important;padding:0 24px!important;grid-template-columns:220px 1fr!important;gap:40px!important}.about-hero .eyebrow{grid-column:1!important;color:var(--accent)!important;border-top:1px solid var(--ink)!important;font:700 10px/1.4 var(--sans)!important;letter-spacing:.16em!important;padding-top:12px!important}.about-hero .hero-text{grid-column:2!important}.about-hero h1{font:300 clamp(48px,7.5vw,88px)/1.03 var(--sans)!important;letter-spacing:-.055em!important;color:var(--ink)!important}.about-hero .sub{font:500 17px/1.55 var(--sans)!important;border-left:4px solid var(--accent);padding-left:14px!important;max-width:760px!important}.about-hero .sub-en{font:400 12px/1.5 var(--sans)!important;color:var(--muted)!important;letter-spacing:.08em!important;text-transform:uppercase!important}.essay-grid{background:var(--paper)!important;padding:0 0 96px!important}.essay-inner{max-width:1120px!important;padding:0 24px!important}.essay-block{grid-template-columns:180px 1fr!important;gap:40px!important;padding:54px 0!important;border-bottom:1px solid var(--ink)!important;--c:var(--accent)!important}.essay-block .meta{grid-column:1!important}.essay-block .content{grid-column:2!important}.essay-block .num,.essay-block .eyebrow{color:var(--accent)!important;font-family:var(--sans)!important}.essay-block .num{font-size:36px!important;font-weight:300!important;letter-spacing:-.05em!important}.essay-block .eyebrow{font-size:9px!important;letter-spacing:.14em!important;text-transform:uppercase!important}.essay-block .block-title{font:400 clamp(28px,4vw,44px)/1.15 var(--sans)!important;letter-spacing:-.035em!important;color:var(--ink)!important;margin-top:0!important}.essay-block p{font:400 17px/1.85 var(--sans)!important;color:var(--ink-soft)!important}.essay-block p.lead{font-size:19px!important;color:var(--ink)!important}.essay-block .big-quote,.essay-block .callout{background:none!important;border:0!important;border-left:3px solid var(--accent)!important;padding:4px 0 4px 18px!important;color:var(--ink)!important;font:400 20px/1.6 var(--sans)!important}.essay-block .book-link{color:var(--accent)!important;border-bottom:1px solid color-mix(in srgb,var(--accent) 30%,transparent);margin-right:.25em}.essay-block .chain{color:var(--ink)!important}.essay-grid+footer,body>footer{background:var(--paper)!important;color:var(--muted)!important;border-top:1px solid var(--ink)!important}
@media(max-width:760px){.hero-inner{padding:0 18px!important}.hero{padding-top:48px!important}.hero-title{font-size:clamp(48px,15vw,72px)!important}.hero-sub,.hero-tag{grid-column:1/-1!important}.hero-cta{display:grid!important;grid-template-columns:1fr 1fr}.cta-pill{border-bottom:1px solid var(--rule)!important}.reader{padding-top:34px!important}.book-head h1{font-size:clamp(38px,12vw,54px)!important}.reader p{font-size:17px!important}.stat-grid{grid-template-columns:1fr 1fr!important}.about-hero-inner{padding:0 18px!important;grid-template-columns:1fr!important;gap:22px!important}.about-hero .eyebrow,.about-hero .hero-text{grid-column:1!important}.essay-inner{padding:0 18px!important}.essay-block{grid-template-columns:1fr!important;gap:20px!important;padding:40px 0!important}.essay-block .meta,.essay-block .content{grid-column:1!important}}

/* ════════ 回补：编辑体系不得吃掉阅读层结构与标注功能 ════════ */
/* 1. 小标题 h6.sub-h —— 曾被正文 18px 压过去，重新拉出层级 */
.reader h6.sub-h{
  font:600 15px/1.4 var(--sans)!important;
  color:var(--accent)!important;
  letter-spacing:.10em!important;
  text-transform:none!important;
  margin:44px 0 12px!important;
  padding-top:10px!important;
  border-top:1px solid var(--rule)!important;
}
/* 2. 金句 p.core —— 样本语法：无底色，左侧钴蓝竖线，加大深墨字 */
.reader p.core{
  background:none!important;
  color:var(--ink)!important;
  border:0!important;
  border-left:3px solid var(--accent)!important;
  padding:6px 0 6px 22px!important;
  margin:2.6em 0 2.4em!important;
  font:400 clamp(21px,2.6vw,26px)/1.55 var(--sans)!important;
  letter-spacing:-.02em!important;
}
.reader p.core::before{content:none!important}
/* 金句内不再嵌第二层强调 —— 一次只强调一件事，否则整块变噪音 */
.reader p.core strong,.reader p.core .enum-mark,.reader p.core .key-marker,
.reader p.core .key-thesis,.reader p.core .key-pos,
.reader p.core .emph-label,.reader p.core .key-warn{
  color:var(--ink)!important;
  text-decoration:none!important;
  font-weight:600!important;
}
.reader p.core .key-neg{color:#5f5f5f!important;text-decoration:none!important;font-weight:400!important}
.reader p.core mark.key-line{
  background:linear-gradient(180deg,transparent 55%,rgba(241,194,27,.55) 55%)!important;
  color:var(--ink)!important;
}
/* 3. 行内金句 mark.key-line —— 保留荧光笔 */
.reader mark.key-line{
  background:linear-gradient(180deg,transparent 55%,rgba(241,194,27,.55) 55%)!important;
  color:var(--ink)!important;
}
/* 4. Kindle 标注 UI —— 深色浮层 + 圆色点 + 投影，全部还原 */
.mark-toolbar{
  background:#161616!important;color:#fff!important;border:0!important;
  box-shadow:0 4px 24px rgba(0,0,0,.25)!important;
}
.mark-toolbar button{background:transparent!important;color:#f4f4f4!important}
.mark-toolbar button:hover{background:#393939!important;color:#fff!important}
.mark-toolbar .danger{color:#ff7eb6!important}
.mark-toolbar::after{border-bottom-color:#161616!important}
.mark-palette{
  background:#fff!important;border:1px solid var(--rule)!important;
  box-shadow:0 4px 24px rgba(0,0,0,.15)!important;
}
.mark-palette .color-dot{border-radius:50%!important}
.notes-panel,.note-modal-inner{box-shadow:0 8px 40px rgba(0,0,0,.18)!important}
.notes-fab{border-radius:0!important;box-shadow:0 4px 12px rgba(0,0,0,.15)!important}
.user-mark{border-radius:0!important}
/* 5. 顶栏已改浅底，深底遗留的浅色控件必须跟着翻 */
.topbar .toc-toggle{color:var(--ink)!important;border-color:var(--rule-strong)!important}
.topbar .toc-toggle:hover{background:var(--paper-deep)!important;border-color:var(--ink)!important;color:var(--accent)!important}
.topbar .home:hover{color:var(--accent)!important}

/* 首页只换字体与色彩；严格保留原八层卡片结构 */
.stack-inner{max-width:1584px!important;padding:0 16px!important}
.layer{
  background:var(--paper)!important;border:0!important;padding:56px 36px 40px!important;
  margin-bottom:1px!important;display:grid!important;grid-template-columns:repeat(16,1fr)!important;
  gap:32px!important;position:relative!important;
}
.layer::before{display:block!important;height:3px!important;background:var(--layer-c)!important}
.layer.layer-dark{background:var(--paper)!important;color:var(--ink)!important}
.layer.layer-dark .layer-name,.layer.layer-dark .book h3,.layer.layer-dark .book .subtitle{color:var(--ink)!important}
.layer.layer-dark .layer-en,.layer.layer-dark .layer-role,.layer.layer-dark .book .role,.layer.layer-dark .book .seq,.layer.layer-dark .book .pages{color:var(--muted)!important}
.layer-head{grid-column:1 / span 4!important;display:flex!important;flex-direction:column!important;gap:6px!important}
.layer-num{
  display:inline-block!important;font:600 11px/1.2 var(--sans)!important;color:var(--layer-c)!important;
  background:var(--layer-tint)!important;padding:4px 10px!important;letter-spacing:.08em!important;
  margin-bottom:22px!important;align-self:flex-start!important;text-transform:uppercase!important;
}
.layer-name{font:400 44px/1.05 var(--sans)!important;letter-spacing:-.035em!important;color:var(--ink)!important}
.layer-en{font:400 11px/1.4 var(--sans)!important;letter-spacing:.1em!important;color:var(--muted)!important;text-transform:uppercase!important}
.layer-role{font:400 15px/1.55 var(--sans)!important;color:var(--ink-soft)!important}
.layer-books{
  grid-column:5 / -1!important;display:grid!important;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr))!important;gap:1px!important;
  background:var(--rule)!important;border:1px solid var(--rule)!important;
}
.layer-books.single{grid-template-columns:1fr!important}
.layer.layer-dark .layer-books{background:var(--rule)!important;border-color:var(--rule)!important}
.book,.layer.layer-dark .book{
  display:flex!important;flex-direction:column!important;background:var(--paper)!important;
  border:1px solid var(--rule)!important;padding:24px 22px 20px!important;
  min-height:240px!important;color:var(--ink)!important;
}
.book:hover,.layer.layer-dark .book:hover{background:var(--paper-deep)!important;border-color:var(--layer-c)!important}
.book .seq .layer-tag,.layer.layer-dark .book .seq .layer-tag{background:var(--layer-c)!important;color:#fff!important}
.book h3{font:500 20px/1.2 var(--sans)!important;letter-spacing:-.015em!important}
.book .subtitle{font:400 14px/1.4 var(--sans)!important;color:var(--ink-soft)!important}
.book .role{font:400 13px/1.5 var(--sans)!important;color:var(--muted)!important;border-top:1px solid var(--rule)!important}
@media(max-width:900px){.layer{grid-template-columns:1fr!important}.layer-head,.layer-books{grid-column:1!important}.layer-books{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))!important}}