/* =========================================================
   超级个体 — 博客风格设计系统
   基于 xiaoe-agent-blog 视觉系统
   ========================================================= */

:root{
  --ink:#292524;
  --paper:#FAFAF9;
  --paper-2:#F5F5F4;
  --accent:#14B8A6;
  --accent-2:#38BDF8;
  --accent-3:#6366F1;
  --muted:#A8A29E;
  --line:#E7E5E4;
  --maxw:1100px;
  --serif:Georgia,'Noto Serif SC','Songti SC',serif;
  --sans:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-xl:20px;
  --shadow-sm:0 1px 3px rgba(0,0,0,0.04),0 1px 2px rgba(0,0,0,0.03);
  --shadow-md:0 4px 16px rgba(0,0,0,0.05),0 2px 8px rgba(0,0,0,0.03);
  --shadow-lg:0 12px 40px rgba(20,184,166,0.08),0 4px 16px rgba(0,0,0,0.04);
  --shadow-hover:0 8px 28px rgba(20,184,166,0.12),0 4px 12px rgba(0,0,0,0.05);
  --topbar-h:58px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none;transition:color .2s;}
a:hover{color:#0F766E;}
img{max-width:100%;display:block;}

/* Typography */
h1,h2,h3,h4{font-family:var(--serif);line-height:1.2;font-weight:600;margin:0;color:var(--ink);}
.display{font-family:var(--serif);font-weight:600;letter-spacing:-.01em;}
.kicker{
  font-family:var(--sans);font-weight:600;font-size:13px;letter-spacing:.12em;
  color:var(--accent);display:inline-block;
}
.lead{font-size:16px;line-height:1.7;color:var(--ink);}
.muted{color:var(--muted);}
.rule{border:0;border-top:1px solid var(--line);margin:0;}
.rule-thin{border:0;border-top:1px solid var(--line);margin:0;}

/* Layout */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.section{padding:56px 0;}
.section:first-of-type{padding-top:0;}
.grid{display:grid;gap:20px;}
.cols-2{grid-template-columns:repeat(2,1fr);}
.cols-3{grid-template-columns:repeat(3,1fr);}
.cols-4{grid-template-columns:repeat(4,1fr);}
@media(max-width:900px){.cols-2,.cols-3,.cols-4{grid-template-columns:1fr;}}

/* Navigation */
#site-nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,0.88);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;height:var(--topbar-h);gap:14px;
}
.brand{
  font-family:var(--serif);font-weight:600;font-size:17px;letter-spacing:.02em;white-space:nowrap;
  color:var(--ink);text-decoration:none;
}
.brand b{color:var(--accent);}
.nav-links{display:flex;gap:2px;flex-wrap:wrap;}
.nav-links a{
  font-size:13px;font-weight:500;padding:6px 12px;border-radius:var(--radius-xl);
  color:var(--ink);transition:all .2s;white-space:nowrap;
}
.nav-links a:hover{background:rgba(20,184,166,0.08);color:var(--accent);}
.nav-links a.active{background:rgba(20,184,166,0.15);color:var(--accent);font-weight:600;}
.nav-toggle{display:none;background:none;border:1px solid var(--line);color:var(--ink);
  font-weight:600;padding:6px 12px;cursor:pointer;border-radius:var(--radius-md);}
@media(max-width:860px){
  .nav-links{display:none;position:absolute;top:var(--topbar-h);left:0;right:0;
    background:#fff;flex-direction:column;padding:10px 16px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-md);}
  .nav-links.open{display:flex;}
  .nav-toggle{display:block;}
}

.auth-slot{display:flex;align-items:center;gap:10px;margin-left:10px;font-size:13px;font-weight:500;white-space:nowrap;}
.auth-slot a{color:var(--ink);text-decoration:none;padding:6px 10px;border-radius:var(--radius-xl);}
.auth-slot a:hover{background:rgba(20,184,166,0.08);color:var(--accent);}
.auth-slot .as-dot{width:8px;height:8px;border-radius:50%;background:#39d353;box-shadow:0 0 0 3px rgba(57,211,83,.18);}
.auth-slot .as-name{color:var(--ink);}
.auth-slot .as-muted{color:var(--muted);}

/* Back-to-blog button */
.back-to-blog{
  font-family:var(--sans);font-size:13px;font-weight:600;white-space:nowrap;
  color:var(--accent);text-decoration:none;
  padding:6px 14px;border-radius:var(--radius-xl);
  border:1px solid rgba(20,184,166,0.3);
  background:rgba(20,184,166,0.06);
  transition:all .2s;
}
.back-to-blog:hover{
  background:rgba(20,184,166,0.15);color:#0F766E;
  border-color:rgba(20,184,166,0.5);
}
@media(max-width:900px){
  .back-to-blog{display:none;}
}

/* Footer */
#site-footer{background:#fff;color:var(--ink);border-top:1px solid var(--line);}
.foot-inner{
  max-width:var(--maxw);margin:0 auto;padding:40px 24px;
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;
}
.foot-inner h4{color:var(--accent);font-family:var(--sans);font-size:13px;
  letter-spacing:.08em;font-weight:600;margin-bottom:12px;}
.foot-inner a{display:block;padding:4px 0;color:var(--muted);font-size:14px;}
.foot-inner a:hover{color:var(--accent);}
.foot-bottom{
  border-top:1px solid var(--line);padding:18px 24px;
  max-width:var(--maxw);margin:0 auto;display:flex;justify-content:space-between;
  flex-wrap:wrap;gap:10px;font-size:12px;color:var(--muted);
}
.foot-bottom a{color:var(--accent);font-weight:600;transition:color .15s;}
.foot-bottom a:hover{color:#0F766E;}
@media(max-width:760px){.foot-inner{grid-template-columns:1fr;}}

/* Hero */
.hero{
  padding:72px 24px 56px;
  background:linear-gradient(135deg,#F0FDFA 0%,#ECFEFF 30%,#F0F9FF 60%,#FDF4FF 100%);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:-40%;left:-5%;
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(20,184,166,0.10) 0%,transparent 60%);
  z-index:0;filter:blur(40px);
}
.hero::after{
  content:'';position:absolute;bottom:-30%;right:-5%;
  width:350px;height:350px;
  background:radial-gradient(circle,rgba(56,189,248,0.08) 0%,transparent 60%);
  z-index:0;filter:blur(40px);
}
.hero .wrap{position:relative;z-index:1;}
.hero h1{
  font-size:clamp(36px,6vw,72px);
  background:linear-gradient(135deg,#14B8A6 0%,#38BDF8 50%,#14B8A6 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero .sub{margin-top:18px;max-width:680px;color:var(--ink);}
.hero .accent-bar{width:100px;height:4px;background:linear-gradient(90deg,var(--accent),var(--accent-2));margin:22px 0;border-radius:2px;}
.hero-meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:24px;}
.hero-meta div{
  background:rgba(20,184,166,0.06);border-radius:var(--radius-md);
  padding:12px 20px;text-align:center;min-width:80px;
}
.hero-meta b{font-family:var(--serif);font-size:26px;display:block;color:var(--accent);}
.hero-split{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:center;}
.quiz-split{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:start;}
@media(max-width:860px){
  .hero-split,.quiz-split{grid-template-columns:1fr;gap:28px;}
  .hero-split>div:last-child{display:flex;justify-content:center;}
  .hero-split svg{max-width:300px;}
}

/* Page header */
.pagehead{padding:48px 24px 36px;background:linear-gradient(135deg,#F0FDFA 0%,#F5F5F4 100%);}
.pagehead .crumb{font-size:13px;color:var(--muted);margin-bottom:8px;}
.pagehead h1{font-size:clamp(24px,4vw,38px);}

/* Entry grid */
.entry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;}
.entry-grid a{
  display:block;padding:22px 20px;border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);transition:all .2s;position:relative;
  background:#fff;
}
.entry-grid a:nth-child(3n){border-right:0;}
.entry-grid a:hover{background:rgba(20,184,166,0.04);}
.entry-grid .num{font-weight:700;font-size:13px;color:var(--accent);}
.entry-grid h3{font-size:20px;margin:8px 0 6px;}
.entry-grid p{font-size:13px;color:var(--muted);margin:0;}
.entry-grid a:hover p{color:var(--ink);}
@media(max-width:860px){.entry-grid{grid-template-columns:1fr;}.entry-grid a{border-right:0;}}

/* Dimension cards */
.dim-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px;transition:all .3s;display:block;
  box-shadow:var(--shadow-sm);
}
.dim-card:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-hover);
  border-color:rgba(20,184,166,0.3);
}
.dim-card .tag{font-weight:600;font-size:12px;letter-spacing:.08em;color:var(--accent);}
.dim-card h3{font-size:22px;margin:8px 0 10px;color:var(--ink);}
.dim-card ul{margin:0;padding-left:18px;font-size:14px;}
.dim-card ul li{margin:4px 0;color:var(--ink);}

/* Cards */
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px;box-shadow:var(--shadow-sm);
}
.card h3{font-size:20px;margin-bottom:8px;color:var(--ink);}
.pill{
  display:inline-block;font-size:11px;font-weight:600;letter-spacing:.04em;
  background:rgba(20,184,166,0.08);color:var(--accent);
  padding:3px 10px;border-radius:var(--radius-xl);margin:0 4px 4px 0;
}
.pill.accent{background:var(--accent);color:#fff;}

/* Pullquote */
.pullquote{
  border-left:4px solid var(--accent);padding:6px 0 6px 22px;margin:28px 0;
  font-family:var(--serif);font-size:22px;line-height:1.4;font-weight:600;color:var(--ink);
}
.pullquote cite{
  display:block;font-family:var(--sans);font-size:13px;font-weight:500;
  color:var(--muted);margin-top:10px;font-style:normal;
}

/* Numbered list */
.numlist{counter-reset:n;list-style:none;padding:0;margin:0;}
.numlist>li{
  counter-increment:n;padding:18px 0 18px 56px;position:relative;
  border-top:1px solid var(--line);
}
.numlist>li:first-child{border-top:0;}
.numlist>li::before{
  content:counter(n,decimal-leading-zero);position:absolute;left:0;top:18px;
  font-family:var(--serif);font-weight:600;font-size:26px;color:var(--accent);
}

/* Tables */
table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14px;border-radius:var(--radius-md);overflow:hidden;}
th,td{border:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top;}
th{background:rgba(20,184,166,0.08);color:var(--ink);font-weight:600;}
tr:nth-child(even){background:#FAFAF9;}

/* Buttons */
.btn{
  display:inline-block;font-weight:600;font-size:14px;padding:11px 24px;
  border:1px solid var(--accent);background:var(--accent);color:#fff;
  cursor:pointer;transition:all .2s;border-radius:var(--radius-xl);
  text-decoration:none;
}
.btn:hover{background:#0F766E;border-color:#0F766E;color:#fff;}
.btn.ghost{background:transparent;color:var(--accent);}
.btn.ghost:hover{background:rgba(20,184,166,0.08);color:var(--accent);}
.btn.small{padding:6px 14px;font-size:13px;}

/* Quiz */
.quiz-q{padding:18px 0;border-top:1px solid var(--line);}
.quiz-q:first-child{border-top:0;}
.quiz-q h4{font-family:var(--sans);font-size:15px;font-weight:600;margin-bottom:12px;color:var(--ink);}
.opt{
  display:block;width:100%;text-align:left;border:1px solid var(--line);
  background:#fff;padding:10px 14px;margin:6px 0;font-size:14px;cursor:pointer;
  border-radius:var(--radius-md);transition:all .15s;font-family:var(--sans);
}
.opt:hover{background:rgba(20,184,166,0.04);border-color:rgba(20,184,166,0.3);}
.opt.sel{background:rgba(20,184,166,0.08);color:var(--ink);border-color:var(--accent);}
.opt b{color:var(--accent);}
.opt.sel b{color:var(--accent);}

/* Result box */
.result-box{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:24px;box-shadow:var(--shadow-sm);
}
.legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px;font-size:12px;}
.legend span{display:inline-flex;align-items:center;gap:6px;}
.legend i{width:12px;height:12px;display:inline-block;border-radius:2px;}

/* Filters */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 24px;}
.filters button{
  border:1px solid var(--line);background:#fff;padding:7px 14px;
  font-weight:500;font-size:13px;cursor:pointer;border-radius:var(--radius-xl);
  transition:all .15s;font-family:var(--sans);color:var(--ink);
}
.filters button:hover{background:rgba(20,184,166,0.06);border-color:rgba(20,184,166,0.3);color:var(--accent);}
.filters button.on{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;border-color:transparent;
  box-shadow:0 2px 8px rgba(20,184,166,0.25);
}

.btn-shuffle{
  display:inline-flex;align-items:center;gap:6px;font:inherit;font-size:13px;
  font-weight:500;cursor:pointer;border:1px solid var(--line);background:#fff;
  color:var(--ink);padding:7px 14px;border-radius:var(--radius-xl);transition:.15s;
}
.btn-shuffle:hover{background:rgba(20,184,166,0.06);border-color:var(--accent);color:var(--accent);}

/* Pager */
.pager{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin:28px 0 8px;}
.pager .pg{
  font-family:var(--sans);font-weight:500;font-size:13px;min-width:36px;
  padding:7px 11px;border:1px solid var(--line);background:#fff;color:var(--ink);
  border-radius:var(--radius-md);cursor:pointer;transition:all .15s;
}
.pager .pg:hover:not(:disabled):not(.on){background:rgba(20,184,166,0.06);border-color:var(--accent);color:var(--accent);}
.pager .pg.on{background:var(--accent);color:#fff;border-color:var(--accent);cursor:default;}
.pager .pg:disabled{opacity:.4;cursor:not-allowed;}
.pager .pg-ell{color:var(--muted);font-weight:500;padding:0 2px;align-self:center;}

/* Book */
.book{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:16px 18px;transition:all .2s;
}
.book h4{font-family:var(--serif);font-size:18px;margin-bottom:6px;}
.book .meta{font-size:12px;color:var(--muted);margin-bottom:6px;}
.book .frame{font-size:13px;color:var(--ink);}
.book-foot{margin-top:12px;border-top:1px solid var(--line);padding-top:12px;}

/* Case card */
.case-card{display:block;text-decoration:none;color:var(--ink);transition:all .3s;}
.case-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:rgba(20,184,166,0.3);}
.case-card .pillrow{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:10px;}
.case-card h3{font-size:20px;margin-bottom:6px;color:var(--ink);}
.case-card .csummary{font-size:14px;color:var(--ink);margin:0;line-height:1.6;}
.case-card .more{display:inline-block;margin-top:12px;font-size:13px;font-weight:600;color:var(--accent);}
.case-card-cover{width:100%;height:160px;object-fit:cover;border-radius:var(--radius-md);margin-bottom:14px;border:1px solid var(--line);}
.case-card-cover--empty{display:flex;align-items:center;justify-content:center;background:var(--paper-2);color:var(--muted);font-size:13px;}

/* Featured tool */
.featured-wrap{padding-top:10px;}
.featured-tool{
  border:1px solid rgba(20,184,166,0.3);border-radius:var(--radius-lg);
  background:linear-gradient(180deg,#f0fdfa 0%,#fff 100%);
  padding:28px 30px 24px;position:relative;
  box-shadow:var(--shadow-md);
}
.ft-badge{
  display:inline-block;background:var(--accent);color:#fff;
  font-size:11px;font-weight:600;letter-spacing:.4px;
  padding:5px 12px;border-radius:var(--radius-xl);margin-bottom:12px;
}
.ft-title{font-family:var(--serif);font-size:clamp(22px,3vw,32px);margin:0 0 8px;line-height:1.2;color:var(--ink);}
.ft-title span{color:var(--accent);font-size:.55em;font-weight:600;margin-left:4px;}
.ft-sub{color:var(--ink);font-weight:500;font-size:14px;margin:0 0 10px;}
.ft-desc{color:var(--ink);font-size:14px;line-height:1.8;max-width:700px;margin:0 0 14px;}
.ft-axes{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px;}
.ft-axis{background:#fff;border:1px solid var(--line);border-radius:var(--radius-xl);padding:5px 13px;font-size:12px;font-weight:500;color:var(--ink);}
.ft-btn{
  display:inline-block;background:var(--accent);color:#fff;font-weight:600;
  text-decoration:none;padding:10px 20px;border-radius:var(--radius-xl);font-size:14px;
}
.ft-btn:hover{background:#0F766E;color:#fff;}

/* Stage */
.stage{border-top:1px solid var(--line);padding:18px 0;}
.stage:first-child{border-top:0;}
.stage .when{font-size:12px;font-weight:600;color:var(--accent);letter-spacing:.04em;}
.stage h3{font-size:24px;margin:8px 0;}
.stage p{font-size:15px;margin:8px 0;}

/* Modal */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);display:none;align-items:flex-start;justify-content:center;z-index:9999;padding:40px 20px;overflow:auto;}
.modal-overlay.open{display:flex;}
.modal{background:#fff;border-radius:var(--radius-lg);max-width:560px;width:100%;max-height:90vh;display:flex;flex-direction:column;box-shadow:var(--shadow-lg);animation:modalIn .2s ease;}
@keyframes modalIn{from{transform:translateY(10px);opacity:0;}to{transform:translateY(0);opacity:1;}}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:2;}
.modal-actions{display:flex;gap:8px;}
.modal-close{background:none;border:none;font-size:28px;line-height:1;cursor:pointer;color:var(--muted);}
.modal-close:hover{color:var(--ink);}
.modal-body{flex:1;overflow:auto;padding:4px 22px 26px;}

/* Videos */
.vc{display:flex;flex-direction:column;}
.vc-top{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.vc-avatar{width:42px;height:42px;flex:0 0 auto;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-weight:600;font-size:20px;color:#fff;background:var(--accent);}
.vc-avatar.dy{background:var(--accent-3);}
.vc-avatar.bili{background:var(--accent-2);}
.vc-id{flex:1 1 auto;min-width:0;}
.vc-id h3{font-size:18px;margin:0;line-height:1.2;}
.vc-handle{font-size:12px;color:var(--muted);font-weight:500;}
.pf{flex:0 0 auto;font-size:11px;font-weight:600;padding:3px 9px;border-radius:var(--radius-xl);color:#fff;}
.pf.dy{background:var(--accent-3);}
.pf.bili{background:var(--accent-2);}
.vc-blurb{font-size:13px;line-height:1.6;color:var(--ink);margin:0 0 14px;}
.vc-vids{border-top:1px solid var(--line);padding-top:12px;margin-bottom:14px;}
.vc-vids-t{display:block;font-weight:600;font-size:12px;letter-spacing:.08em;color:var(--accent);margin-bottom:6px;}
.vc-vids ul{list-style:none;margin:0;padding:0;}
.vc-vids li{font-size:13px;line-height:1.5;color:var(--ink);padding:3px 0;display:flex;gap:6px;align-items:flex-start;}
.vc-vids .v-play{color:var(--accent);font-size:10px;line-height:1.7;flex:0 0 auto;}
.vc-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;margin-top:auto;border-top:1px solid var(--line);padding-top:12px;}
.vc-fans{font-size:12px;font-weight:600;color:var(--muted);}
.vc-go{
  display:inline-block;font-weight:600;font-size:13px;letter-spacing:.02em;
  background:var(--accent);color:#fff;padding:7px 14px;border:1px solid var(--accent);
  text-decoration:none;border-radius:var(--radius-xl);transition:all .15s;white-space:nowrap;
}
.vc-go:hover{background:#0F766E;color:#fff;}
.vc-pfs{display:flex;flex-direction:column;gap:4px;align-items:flex-end;}
.vc-gos{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end;}
.vc-tags{display:flex;flex-wrap:wrap;gap:4px;align-items:center;}

/* Case detail page */
.case-detail{max-width:800px;margin:0 auto;}
.case-detail .breadcrumb{margin-bottom:24px;font-size:13px;color:var(--muted);}
.case-detail .breadcrumb a{color:var(--accent);}
.case-detail h1{font-size:28px;margin-bottom:16px;color:var(--ink);}
.case-detail .meta{margin-bottom:24px;color:var(--muted);font-size:13px;}

/* Responsive extras */
@media(max-width:760px){
  .featured-tool{padding:20px 16px;}.ft-title{font-size:22px;}
  .section{padding:40px 0;}
  .hero{padding:48px 16px 40px;}
  .pagehead{padding:36px 16px 28px;}
}

/* Search box */
#searchBox{
  flex:1 1 280px;min-width:240px;border:1px solid var(--line);
  background:#fff;padding:10px 14px;font-size:14px;font-family:var(--sans);
  border-radius:var(--radius-xl);transition:all .2s;
}
#searchBox:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(20,184,166,0.08);}

/* =========================================================
   书籍全文页（书库详情）
   ========================================================= */
/* 移除 auth 锁定，所有内容直接显示 */
.locked{display:block !important;}
.book-body--open{display:none !important;}

.book-hero{padding:58px 0 34px;border-bottom:3px solid var(--line);}
.book-hero .kicker{font-family:var(--sans);font-weight:800;font-size:13px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--accent);}
.book-hero h1{font-size:clamp(32px,5vw,56px);margin:14px 0 0;line-height:1.05;}
.book-hero .byline{font-size:18px;color:var(--muted);margin-top:14px;max-width:760px;}
.book-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;}
.book-meta .chip{font-size:13px;font-weight:800;padding:6px 14px;border:2px solid var(--ink);
  border-radius:20px;background:var(--paper);}
.book-meta .chip.accent{background:var(--accent);color:#fff;border-color:var(--accent);}
.book-back{display:inline-block;margin-top:18px;font-weight:800;font-size:14px;color:var(--accent);}
.book-back:hover{text-decoration:underline;}

.book-layout{max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:grid;grid-template-columns:minmax(0,1fr) 264px;gap:48px;align-items:start;}
.book-reader{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
.book-main{min-width:0;padding:36px 0 80px;}
.book-toc{position:sticky;top:82px;align-self:start;padding:36px 0;max-height:calc(100vh - 100px);overflow:auto;}
.book-toc .toc-title{font-family:var(--sans);font-weight:800;font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--accent);margin-bottom:14px;}
.book-toc ol{list-style:none;margin:0;padding:0;}
.book-toc li{margin:0;}
.book-toc a{display:block;padding:6px 0 6px 14px;font-size:14px;color:var(--muted);
  border-left:2px solid rgba(13,13,13,.2);line-height:1.4;transition:all .12s;}
.book-toc a:hover{color:var(--ink);border-left-color:var(--accent);}
.book-toc .lvl1 a{font-weight:800;color:var(--ink);font-size:14.5px;}
.book-toc .lvl2 a{font-weight:700;color:var(--ink);padding-left:14px;}
.book-toc .lvl3 a{padding-left:30px;font-size:13px;}

.book-body{font-size:17px;line-height:1.85;}
.book-body--open > h1:first-child{display:none;}
.book-body h1{font-size:30px;margin:46px 0 16px;border-bottom:3px solid var(--line);padding-bottom:8px;}
.book-body h2{font-size:25px;margin:38px 0 14px;}
.book-body h3{font-size:20px;margin:28px 0 10px;}
.book-body h4{font-size:17px;margin:22px 0 8px;font-family:var(--sans);font-weight:800;}
.book-body p{margin:14px 0;}
.book-body blockquote{border-left:6px solid var(--accent);padding:4px 0 4px 20px;margin:22px 0;color:var(--muted);}
.book-body pre{background:var(--ink);color:var(--paper);padding:16px;overflow:auto;border-radius:3px;font-size:14px;}
.book-body code{font-family:"SFMono-Regular",Consolas,Monaco,monospace;font-size:14px;}
.book-body :not(pre) > code{background:var(--paper-2);padding:2px 6px;border-radius:3px;}
.book-body ul,.book-body ol{padding-left:24px;margin:14px 0;}
.book-body li{margin:6px 0;}
.book-body img{max-width:100%;}
.book-body hr{border:0;border-top:1px solid rgba(13,13,13,.25);margin:30px 0;}

.book-nav{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:3px solid var(--line);padding:28px 28px 60px;max-width:var(--maxw);margin:0 auto;}
.book-nav a{border:3px solid var(--ink);padding:14px 20px;flex:1 1 240px;font-weight:800;transition:all .15s;}
.book-nav a:hover{background:var(--ink);color:var(--paper);}
.book-nav .label{font-size:12px;color:var(--muted);display:block;letter-spacing:.1em;}
.book-nav .ttl{font-family:var(--serif);font-size:18px;display:block;margin-top:4px;}
.book-nav a.next{text-align:right;}

@media(max-width:980px){.book-layout{grid-template-columns:1fr;}.book-toc{display:none;}}
@media(max-width:600px){.book-layout{padding:0 18px;}.book-reader{padding:0 18px;}.book-nav{padding:24px 18px 50px;}}