:root{
    --bg:#FCFAF5;
    --surface:#FFFFFF;
    --silver:#EEF0F2;
    --ink:#211C18;
    --ink-soft:#6E655B;
    --line:#ECE4D6;
    --red:#E5342B;
    --orange:#F26F21;
    --amber:#F7A81C;
    --yellow:#FBD417;
    --peach:#FCE3CB;
    --peach-soft:#FDF0E2;
    --grad:linear-gradient(100deg,#E5342B 0%,#F26F21 54%,#FBD417 100%);
    --grad-ro:linear-gradient(120deg,#E5342B 0%,#F26F21 100%);
    --dark:#221A15;
    --radius:18px;
    --maxw:1160px;
    --font-cjk:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",sans-serif;
    --font-latin:ui-sans-serif,system-ui,"Segoe UI",Roboto,Helvetica,Arial,var(--font-cjk);
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;background:var(--bg);color:var(--ink);
    font-family:var(--font-cjk);font-size:16px;line-height:1.75;
    -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  }
  a{color:inherit;text-decoration:none}
  img{max-width:100%;display:block}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
  .eyebrow{
    font-family:var(--font-latin);font-size:12px;font-weight:700;
    letter-spacing:.22em;text-transform:uppercase;color:var(--orange);
    display:inline-flex;align-items:center;gap:10px;
  }
  .eyebrow::before{content:"";width:26px;height:2px;background:var(--grad-ro);display:inline-block}
  h1,h2,h3{margin:0;line-height:1.2;letter-spacing:-.01em}
  .btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:13px 26px;border-radius:999px;font-weight:600;font-size:15px;
    transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
    cursor:pointer;border:1.5px solid transparent;
  }
  .btn-primary{background:var(--grad-ro);color:#fff}
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px -12px rgba(229,52,43,.6)}
  .btn-ghost{border-color:var(--ink);color:var(--ink)}
  .btn-ghost:hover{background:var(--ink);color:#fff}
  .btn-light{background:#fff;color:var(--red)}
  .btn-light:hover{transform:translateY(-2px);box-shadow:0 12px 24px -12px rgba(0,0,0,.3)}

  /* logo mark: two overlapping brand circles */
  .logo-mark{display:inline-flex;line-height:0}
  .brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.02em}
  .brand small{display:block;font-size:11px;font-weight:700;color:var(--ink-soft);letter-spacing:.16em;font-family:var(--font-latin)}

  /* ---------- header ---------- */
  header{
    position:sticky;top:0;z-index:50;
    background:rgba(252,250,245,.84);backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav{display:flex;align-items:center;justify-content:space-between;height:68px}
  .nav-links{display:flex;gap:30px;align-items:center;font-size:15px;color:var(--ink-soft)}
  .nav-links a:hover{color:var(--red)}
  .nav-cta{display:flex;align-items:center;gap:14px}
  .nav-cta .btn{padding:8px 20px;font-size:14px}

  /* ---------- hero ---------- */
  .hero{padding:76px 0 64px;position:relative;overflow:hidden}
  .hero::before{content:"";position:absolute;right:-160px;top:-120px;width:520px;height:520px;border-radius:50%;background:var(--grad);opacity:.10;filter:blur(10px);z-index:0}
  .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative;z-index:1}
  .hero h1{
    font-family:var(--font-latin);font-weight:800;font-size:clamp(48px,7vw,86px);
    line-height:.98;letter-spacing:-.03em;margin:20px 0 0;
  }
  .hero h1 em{font-style:italic;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
  .hero .lead{font-size:19px;color:var(--ink-soft);margin:22px 0 0;max-width:30ch}
  .hero .cta-row{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
  .hero-media{position:relative}
  .hero-media .frame{
    border-radius:26px;overflow:hidden;aspect-ratio:5/6;
    box-shadow:0 30px 60px -30px rgba(33,28,24,.4);
  }
  .frame img{width:100%;height:100%;object-fit:cover;display:block}
  .badge{
    position:absolute;left:-18px;bottom:26px;background:var(--surface);
    border:1px solid var(--line);border-radius:16px;padding:14px 18px;
    box-shadow:0 16px 30px -18px rgba(33,28,24,.35);display:flex;gap:12px;align-items:center;
  }
  .badge b{font-family:var(--font-latin);font-size:26px;background:var(--grad-ro);-webkit-background-clip:text;background-clip:text;color:transparent}
  .badge span{font-size:12.5px;color:var(--ink-soft);line-height:1.35}

  /* ---------- section shell ---------- */
  section{padding:88px 0}
  .sec-head{max-width:640px}
  .sec-head h2{font-size:clamp(28px,3.6vw,42px);margin-top:16px;font-weight:800}
  .sec-head p{color:var(--ink-soft);margin:16px 0 0;font-size:17px}

  /* ---------- values grid ---------- */
  .values{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  .val-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:52px}
  .val{padding:28px 26px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
  .val:hover{transform:translateY(-4px);border-color:var(--orange);box-shadow:0 20px 40px -28px rgba(242,111,33,.5)}
  .val .n{font-family:var(--font-latin);font-size:13px;font-weight:800;background:var(--grad-ro);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:.08em}
  .val h3{font-size:19px;margin:14px 0 8px}
  .val p{margin:0;font-size:15px;color:var(--ink-soft)}

  /* ---------- lab ---------- */
  .lab-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:56px;align-items:center;margin-top:8px}
  .lab-media .frame{border-radius:22px;overflow:hidden;aspect-ratio:4/3;box-shadow:0 26px 50px -28px rgba(33,28,24,.4)}
  .lab-list{margin:34px 0 0;padding:0;list-style:none;display:grid;gap:22px}
  .lab-list li{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start}
  .lab-list .dot{width:38px;height:38px;border-radius:12px;background:var(--peach);color:var(--red);display:grid;place-items:center;font-weight:800;font-family:var(--font-cjk)}
  .lab-list h3{font-size:17px;margin:0 0 4px}
  .lab-list p{margin:0;font-size:15px;color:var(--ink-soft)}

  /* ---------- lifecycle timeline (signature) ---------- */
  .cycle{background:var(--dark);color:#fff}
  .cycle .eyebrow{color:var(--amber)}
  .cycle .eyebrow::before{background:var(--grad)}
  .cycle .sec-head h2{color:#fff}
  .cycle .sec-head p{color:rgba(255,255,255,.72)}
  .track{position:relative;margin-top:56px}
  .track .rail{position:absolute;left:0;right:0;top:31px;height:3px;background:rgba(255,255,255,.16);border-radius:3px;overflow:hidden}
  .track .rail::after{content:"";position:absolute;left:0;top:0;height:100%;width:var(--fill,0%);background:var(--grad);transition:width 1.3s ease}
  .stages{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;position:relative}
  .stage .node{width:16px;height:16px;border-radius:50%;background:var(--orange);border:4px solid var(--dark);box-shadow:0 0 0 2px var(--amber);margin-bottom:26px}
  .stage .age{font-family:var(--font-latin);font-weight:700;font-size:13px;letter-spacing:.06em;color:var(--amber);text-transform:uppercase}
  .stage h3{font-size:22px;margin:6px 0 10px}
  .stage .range{font-size:13px;color:rgba(255,255,255,.68);margin-bottom:14px}
  .stage ul{margin:0;padding:0;list-style:none;display:grid;gap:8px}
  .stage li{font-size:14.5px;color:rgba(255,255,255,.9);display:flex;gap:8px;align-items:center}
  .stage li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange)}

  /* ---------- products ---------- */
  .prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;margin-top:52px}
  .prod{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--surface);display:flex;flex-direction:column;transition:transform .2s ease,box-shadow .2s ease}
  .prod:hover{transform:translateY(-4px);box-shadow:0 24px 46px -26px rgba(33,28,24,.4)}
  .prod .shot{height:300px;background:#fff;border-bottom:1px solid var(--line);padding:18px;overflow:hidden}
  .prod .shot img{width:100%;height:100%;object-fit:contain;object-position:center}
  .prod .body{padding:26px 26px 28px}
  .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--red);background:var(--peach);padding:4px 12px;border-radius:999px;letter-spacing:.04em}
  .prod h3{font-size:22px;margin:14px 0 8px}
  .prod .hl{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--orange);margin:0 0 10px}
  .prod .hl b{background:var(--grad-ro);-webkit-background-clip:text;background-clip:text;color:transparent}
  .prod p{margin:0 0 20px;font-size:15px;color:var(--ink-soft)}
  .prod .links{display:flex;gap:14px;flex-wrap:wrap}
  .prod .links a{font-size:14px;font-weight:600;color:var(--red);border-bottom:2px solid var(--amber);padding-bottom:2px}
  .prod .links a:hover{color:var(--orange)}

  /* ---------- reviews marquee ---------- */
  .reviews{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden}
  .marquee{margin-top:48px;position:relative;-webkit-mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent);mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent)}
  .marquee-track{display:flex;gap:20px;width:max-content;animation:scrollx 42s linear infinite}
  .marquee:hover .marquee-track{animation-play-state:paused}
  @keyframes scrollx{from{transform:translateX(0)}to{transform:translateX(-50%)}}
  .review{width:320px;flex:0 0 auto;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:24px}
  .review .stars{color:var(--amber);letter-spacing:2px;font-size:15px}
  .review p{margin:12px 0 16px;font-size:15px;color:var(--ink);line-height:1.7}
  .review .who{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--ink-soft)}
  .review .who .ava{width:30px;height:30px;border-radius:50%;background:var(--peach);display:grid;place-items:center;font-weight:700;color:var(--red);font-size:13px}

  /* ---------- founder ---------- */
  .founder{background:var(--peach-soft)}
  .founder-grid{display:grid;grid-template-columns:auto 1fr;gap:44px;align-items:center}
  .founder .portrait{width:150px;height:150px;border-radius:24px;overflow:hidden;background:var(--surface);border:1px solid var(--line);flex:0 0 auto}
  .founder .portrait img{width:100%;height:100%;object-fit:cover;display:block}
  .founder blockquote{margin:0;font-size:clamp(20px,2.6vw,27px);line-height:1.5;font-weight:500;letter-spacing:-.01em}
  .founder .sign{margin-top:22px;display:flex;align-items:center;gap:12px}
  .founder .sign b{font-size:16px}
  .founder .sign span{color:var(--ink-soft);font-size:14px}

  /* ---------- book ---------- */
  .book-grid{display:grid;grid-template-columns:auto 1fr;gap:52px;align-items:center}
  .book .cover{width:230px;aspect-ratio:3/4;border-radius:8px;overflow:hidden;flex:0 0 auto;box-shadow:0 30px 50px -24px rgba(33,28,24,.5);background:var(--grad-ro)}
  .book h2{font-size:clamp(26px,3.2vw,38px);margin-top:16px}
  .book p{color:var(--ink-soft);font-size:17px;margin:18px 0 0;max-width:46ch}
  .book .cta-row{margin-top:28px;display:flex;gap:14px;flex-wrap:wrap}

  /* ---------- buy / QR (bold gradient moment) ---------- */
  .buy{background:var(--grad);color:#fff;position:relative;overflow:hidden}
  .buy .eyebrow{color:#fff}
  .buy .eyebrow::before{background:#fff}
  .buy .sec-head h2{color:#fff}
  .buy .sec-head p{color:rgba(255,255,255,.9)}
  .qr-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:48px;max-width:720px}
  .qr{background:#fff;color:var(--ink);border-radius:var(--radius);padding:28px;display:flex;gap:22px;align-items:center;box-shadow:0 20px 40px -24px rgba(0,0,0,.35)}
  .qr .code{width:130px;height:130px;flex:0 0 auto;border-radius:12px;background:var(--silver);border:1px solid var(--line);padding:8px;overflow:hidden}
  .qr .code img{width:100%;height:100%;object-fit:contain;display:block;border-radius:4px}
  .qr h3{font-size:20px;margin:0 0 6px}
  .qr p{margin:0 0 14px;font-size:14px;color:var(--ink-soft)}
  .qr a{font-size:14px;font-weight:600;color:var(--red);border-bottom:2px solid var(--amber);padding-bottom:2px}
  .qr-hint{font-size:14px;font-weight:600;color:var(--red);display:inline-flex;align-items:center;gap:7px}

  /* ---------- footer ---------- */
  footer{background:var(--dark);color:#cabfb4;padding:64px 0 32px}
  .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
  footer .brand{color:#fff}
  footer .brand small{color:#a2988b}
  footer .tagline{margin:16px 0 0;font-size:14px;color:#a2988b;max-width:26ch}
  .foot-col h4{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:#8a8073;margin:0 0 16px;font-family:var(--font-latin)}
  .foot-col a{display:block;font-size:14.5px;margin-bottom:10px;color:#cabfb4}
  .foot-col a:hover{color:#fff}
  .foot-bottom{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#8a8073}
  .foot-bottom a:hover{color:#fff}

  /* ---------- image placeholders ---------- */
  .ph{
    width:100%;height:100%;display:grid;place-items:center;text-align:center;
    background:
      linear-gradient(135deg,rgba(229,52,43,.08),rgba(251,212,23,.12)),
      repeating-linear-gradient(45deg,transparent 0 12px,rgba(33,28,24,.03) 12px 24px);
    color:var(--ink-soft);font-size:12.5px;line-height:1.6;padding:16px;
    font-family:var(--font-latin);letter-spacing:.03em;
  }
  .ph b{display:block;font-size:13px;color:var(--ink);margin-bottom:4px;font-weight:700}
  .ph .dim{color:var(--red);font-weight:700}

  /* ---------- reveal animation ---------- */
  .reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
  .reveal.in{opacity:1;transform:none}

  /* ---------- responsive ---------- */
  @media(max-width:900px){
    .nav-links{display:none}
    .hero-grid,.lab-grid,.founder-grid,.book-grid{grid-template-columns:1fr}
    .hero{padding:48px 0 40px}
    .hero-media{order:-1;max-width:420px}
    .val-grid{grid-template-columns:1fr 1fr}
    .stages{grid-template-columns:1fr}
    .track .rail{display:none}
    .stage{border-left:2px solid rgba(255,255,255,.18);padding-left:24px;padding-bottom:8px}
    .stage .node{margin-left:-33px}
    .prod-grid,.qr-grid{grid-template-columns:1fr}
    .founder-grid{gap:24px}
    .foot-grid{grid-template-columns:1fr 1fr}
    section{padding:60px 0}
  }
  @media(max-width:560px){
    .val-grid{grid-template-columns:1fr}
    .foot-grid{grid-template-columns:1fr}
    .brand small{display:none}
    .qr{flex-direction:column;text-align:center}
  }
  @media(prefers-reduced-motion:reduce){
    *{scroll-behavior:auto!important}
    .marquee-track{animation:none!important}
    .reveal{opacity:1;transform:none;transition:none}
    .track .rail::after{transition:none}
  }


/* ================= multi-page additions ================= */
.crumb{font-size:13px;color:var(--ink-soft);padding:26px 0 0;font-family:var(--font-latin)}
.crumb a:hover{color:var(--red)}
.crumb span{color:var(--ink)}
.page{padding:28px 0 20px}

/* product detail */
.pd-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:52px;align-items:center}
.pd-shot{background:#fff;border:1px solid var(--line);border-radius:var(--radius);height:440px;padding:28px;overflow:hidden}
.pd-shot img{width:100%;height:100%;object-fit:contain}
.pd-info h1{font-size:clamp(28px,4vw,42px);margin:16px 0 0;font-weight:800}
.pd-hl{font-weight:700;margin:14px 0 0;background:var(--grad-ro);-webkit-background-clip:text;background-clip:text;color:transparent;display:inline-block}
.pd-intro{color:var(--ink-soft);font-size:17px;margin:14px 0 0}
.pd-spec{margin:24px 0 0;border-top:1px solid var(--line)}
.pd-spec-row{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.pd-spec-row span{color:var(--ink-soft)}
.pd-buy{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0 0}
.pd-note{font-size:12.5px;color:var(--ink-soft);margin:14px 0 0}
.pd-section{padding:64px 0}
.pd-section.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.pd-h2{font-size:clamp(24px,3vw,34px);margin:14px 0 34px;font-weight:800}
.pd-ing{margin-top:0}
.feed-list{margin:0;padding:0;list-style:none;display:grid;gap:14px;max-width:760px}
.feed-list li{position:relative;padding-left:26px;font-size:16px;color:var(--ink)}
.feed-list li::before{content:"";position:absolute;left:0;top:11px;width:9px;height:9px;border-radius:50%;background:var(--grad-ro)}
.faq{display:grid;gap:0;max-width:820px}
.faq-item{border-top:1px solid var(--line);padding:22px 0}
.faq-item:last-child{border-bottom:1px solid var(--line)}
.faq-item h3{font-size:17px;margin:0 0 8px}
.faq-item p{margin:0;color:var(--ink-soft);font-size:15px}
.other-prod{display:inline-flex;align-items:center;gap:18px;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:16px 22px 16px 16px;transition:transform .2s,border-color .2s}
.other-prod:hover{transform:translateY(-3px);border-color:var(--orange)}
.other-prod img{width:76px;height:76px;object-fit:contain;background:#fff;border-radius:12px;border:1px solid var(--line);padding:6px}
.other-prod b{display:block;font-size:16px}
.other-prod span{font-size:13px;color:var(--red);font-weight:600}

/* news list */
.list-title{font-size:clamp(30px,4vw,46px);margin:16px 0 0;font-weight:800}
.post-list{margin:40px 0 0;max-width:820px}
.post-item{display:grid;grid-template-columns:112px 1fr;gap:24px;padding:26px 0;border-top:1px solid var(--line);align-items:start}
.post-item:last-child{border-bottom:1px solid var(--line)}
.post-item .date{color:var(--ink-soft);font-family:var(--font-latin);font-size:14px;padding-top:3px}
.post-item h3{font-size:20px;margin:0 0 6px;transition:color .18s}
.post-item:hover h3{color:var(--red)}
.post-item p{margin:0;color:var(--ink-soft);font-size:15px}

/* article */
.article{padding:8px 0 40px}
.wrap-narrow{max-width:740px;margin:0 auto;padding:0 24px}
.article h1{font-size:clamp(28px,4vw,42px);margin:14px 0 0;font-weight:800;line-height:1.25}
.article-body{margin:32px 0 0}
.article-body p{font-size:17px;line-height:1.85;margin:0 0 22px;color:var(--ink)}
.article-body h2{font-size:22px;margin:36px 0 14px;font-weight:800}
.article-body h3{font-size:18px;margin:28px 0 10px;font-weight:700}
.article-body img{border-radius:14px;margin:12px 0 22px;border:1px solid var(--line)}
.article-body .article-lead{font-size:19px;font-weight:600;color:var(--ink);margin:0 0 26px}
.article-body ul{padding-left:20px;margin:0 0 22px}
.article-body li{margin:0 0 8px;line-height:1.7}
.back-link{display:inline-block;margin-top:20px;color:var(--red);font-weight:600;border-bottom:2px solid var(--amber);padding-bottom:2px}
.back-link:hover{color:var(--orange)}
.article-body a{color:var(--red);font-weight:600;border-bottom:2px solid var(--amber);padding-bottom:1px}
.article-body a:hover{color:var(--orange)}
.article-source{margin-top:32px!important;padding-top:20px;border-top:1px solid var(--line);font-size:14px!important;color:var(--ink-soft)!important;line-height:1.8!important}

@media(max-width:900px){
  .pd-grid{grid-template-columns:1fr;gap:28px}
  .pd-shot{height:320px}
  .post-item{grid-template-columns:1fr;gap:6px}
  .post-item .date{padding-top:0}
}

/* brand logo image */
.brand .logo-img{height:42px;width:auto;display:block}
footer .brand{align-items:center}
footer .logo-img-foot{height:44px}
@media(max-width:560px){.brand .logo-img{height:34px}}

/* ================= book reader page ================= */
.book-hero{padding:36px 0 8px}
.book-hero-grid{display:grid;grid-template-columns:260px 1fr;gap:48px;align-items:center}
.book-hero-cover{border-radius:10px;overflow:hidden;box-shadow:0 30px 55px -26px rgba(33,28,24,.55)}
.book-hero-cover img{width:100%;display:block}
.book-hero-info h1{font-size:clamp(34px,5vw,52px);margin:14px 0 0;font-weight:800;letter-spacing:.02em}
.book-sub{font-size:18px;color:var(--ink);margin:12px 0 0;font-weight:600}
.book-blurb{color:var(--ink-soft);font-size:16px;margin:16px 0 0;max-width:52ch}
.book-author{margin:18px 0 0;font-weight:600;color:var(--red)}
.book-hero-info .cta-row{display:flex;gap:14px;margin:26px 0 0;flex-wrap:wrap}
.book-note{margin:22px 0 0;font-size:12.5px;color:var(--ink-soft);max-width:60ch;line-height:1.6}
.book-h2{font-size:clamp(24px,3vw,34px);margin:14px 0 0;font-weight:800}
.book-grade{padding:64px 0}
.grade-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:34px}
.grade-card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--surface)}
.grade-card .g{display:inline-block;font-weight:800;font-size:13px;padding:4px 12px;border-radius:999px;color:#fff;letter-spacing:.04em}
.grade-card .gA{background:var(--red)}
.grade-card .gB{background:var(--orange)}
.grade-card .gC{background:var(--amber)}
.grade-card h3{font-size:17px;margin:14px 0 8px}
.grade-card p{margin:0;font-size:14.5px;color:var(--ink-soft)}
.book-toc-sec{padding:0 0 64px}
.book-toc{list-style:none;margin:34px 0 0;padding:0;max-width:760px;border-top:1px solid var(--line)}
.book-toc li{padding:12px 4px;border-bottom:1px solid var(--line);font-size:16px}
.book-toc .toc-part{font-weight:800;color:var(--red);margin-top:8px;font-size:15px;letter-spacing:.02em}
.book-toc .toc-ch{padding-left:20px;color:var(--ink)}
.book-toc .toc-front{font-weight:600}
.book-reader{padding:56px 0 80px;background:var(--surface);border-top:1px solid var(--line)}
.reader-hint{color:var(--ink-soft);font-size:14px;margin:14px 0 22px}
.reader-hint a{color:var(--red);font-weight:600;border-bottom:2px solid var(--amber)}
.pdf-frame{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--silver)}
.pdf-frame iframe{width:100%;height:82vh;min-height:560px;border:0;display:block}
@media(max-width:900px){
  .book-hero-grid{grid-template-columns:1fr;gap:24px}
  .book-hero-cover{max-width:220px}
  .grade-cards{grid-template-columns:1fr}
  .pdf-frame iframe{height:72vh;min-height:460px}
}
/* homepage book cover image */
.book .cover img{width:100%;height:100%;object-fit:cover;display:block}

/* ============ pure-HTML book reader ============ */
.wrap-narrow{max-width:760px;margin:0 auto;padding:0 24px}
.bk-article{padding:20px 0 72px}
.bk-eyebrow{color:var(--red);font-weight:700;font-size:13px;letter-spacing:.04em;margin:8px 0 6px}
.bk-title{font-size:clamp(26px,4vw,38px);font-weight:800;line-height:1.3;margin:6px 0 26px;letter-spacing:.01em}
.bk-article .wrap-narrow>h2,.bk-h2{font-size:clamp(21px,3vw,27px);font-weight:800;margin:44px 0 14px;padding-top:8px}
.bk-article h3{font-size:19px;font-weight:700;margin:32px 0 12px;color:var(--ink)}
.bk-article p{font-size:16.5px;line-height:1.95;color:#2b2620;margin:0 0 18px}
.bk-article ul{margin:0 0 20px;padding-left:22px}
.bk-article li{font-size:16.5px;line-height:1.85;color:#2b2620;margin:0 0 9px}
.bk-article .ref{font-size:13.5px;line-height:1.7;color:var(--ink-soft);margin:0 0 7px}
.keypoints{background:linear-gradient(180deg,#fff7ef,#fdf1e6);border:1px solid #f6d9be;border-left:4px solid var(--orange);border-radius:12px;padding:22px 24px;margin:30px 0}
.keypoints h4{margin:0 0 12px;font-size:16px;color:var(--red);font-weight:800}
.keypoints p{font-size:15.5px;margin:0 0 10px}
.keypoints .kp-h{font-weight:700;color:var(--ink)}
.keypoints .kp-li{font-size:15.5px;line-height:1.8;padding-left:18px;position:relative;margin:0 0 8px}
.keypoints .kp-li:before{content:"·";position:absolute;left:4px;color:var(--orange);font-weight:800}
.refs{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin:28px 0}
.refs h4{margin:0 0 10px;font-size:14px;color:var(--ink-soft);font-weight:700;letter-spacing:.03em}
.tbl-wrap{overflow-x:auto;margin:16px 0 8px;border:1px solid var(--line);border-radius:12px}
.bk-article table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:440px}
.bk-article th{background:var(--silver);text-align:left;padding:11px 14px;font-weight:700;border-bottom:2px solid var(--line);white-space:nowrap}
.bk-article td{padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top;color:#2b2620}
.bk-article tbody tr:last-child td{border-bottom:0}
.tbl-note{font-size:13.5px!important;color:var(--ink-soft)!important;margin:8px 0 24px!important}
/* chapter pager: prev/next + progress, redesigned for clearer page-turning */
.bk-pager{margin:56px 0 0;padding-top:26px;border-top:1px solid var(--line)}
.bk-pager-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:0 0 18px;flex-wrap:wrap}
.bk-pager-progress{display:inline-flex;align-items:center;gap:10px}
.bk-pager-bar{width:120px;height:5px;border-radius:999px;background:var(--silver);overflow:hidden}
.bk-pager-fill{display:block;height:100%;background:var(--grad-ro);border-radius:999px}
.bk-pager-num{font-family:var(--font-latin);font-size:12.5px;font-weight:700;color:var(--ink-soft);letter-spacing:.03em}
.bk-pager-toc{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;color:var(--ink-soft);transition:color .15s}
.bk-pager-toc:hover{color:var(--red)}
.bk-pager-toc-ico{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:7px;background:var(--silver);font-size:12px}
.bk-pager-row{display:flex;gap:16px;flex-wrap:wrap}
.bk-pager-card{
  flex:1 1 280px;max-width:calc(50% - 8px);
  display:flex;flex-direction:column;gap:10px;
  padding:22px 24px;border:1.5px solid var(--line);border-radius:var(--radius);
  background:var(--surface);
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.bk-pager-card:hover{transform:translateY(-3px);border-color:var(--orange);box-shadow:0 18px 34px -22px rgba(33,28,24,.28)}
.bk-pager-next{margin-left:auto;align-items:flex-end;text-align:right}
.bk-pager-dir{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--orange);font-family:var(--font-latin)}
.bk-pager-arrow{display:inline-grid;place-items:center;width:28px;height:28px;flex:0 0 auto;border-radius:50%;background:var(--peach-soft);color:var(--red);font-size:14px;transition:transform .18s ease,background .18s ease,color .18s ease}
.bk-pager-card:hover .bk-pager-arrow{background:var(--grad-ro);color:#fff}
.bk-pager-prev:hover .bk-pager-arrow{transform:translateX(-4px)}
.bk-pager-next:hover .bk-pager-arrow{transform:translateX(4px)}
.bk-pager-title{font-size:17px;font-weight:700;color:var(--ink);line-height:1.45}
@media(max-width:640px){
  .bk-pager-card,.bk-pager-next{max-width:100%;text-align:left;align-items:flex-start;margin-left:0}
  .bk-pager-bar{width:80px}
}
/* TOC landing entries */
.toc-entries{margin-top:30px;border-top:1px solid var(--line);max-width:820px}
.toc-part{font-weight:800;color:var(--red);font-size:14.5px;letter-spacing:.02em;margin:22px 0 4px;padding:6px 0}
.toc-entry{display:flex;flex-direction:column;gap:2px;padding:14px 6px;border-bottom:1px solid var(--line);transition:background .15s}
.toc-entry:hover{background:var(--surface)}
.toc-entry .te-t{font-size:16.5px;color:var(--ink);font-weight:600}
.toc-entry:hover .te-t{color:var(--red)}
.toc-entry .te-sub{font-size:13.5px;color:var(--ink-soft)}
@media(max-width:560px){.bk-nav a{max-width:100%}.bk-article p,.bk-article li{font-size:16px}}

/* ============ 抖音二维码弹窗（纯 CSS，:target 控制显隐） ============ */
.qr-modal{display:none;position:fixed;inset:0;z-index:200}
.qr-modal:target{display:block}
.qr-modal-overlay{position:absolute;inset:0;display:block;background:rgba(33,28,24,.6);backdrop-filter:blur(2px)}
.qr-modal-box{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:min(300px,84vw);background:#fff;border-radius:20px;padding:16px;box-shadow:0 40px 70px -20px rgba(0,0,0,.5)}
.qr-modal-box img{width:100%;border-radius:12px;display:block}
.qr-modal-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;background:#fff;color:var(--ink);display:grid;place-items:center;font-size:15px;font-weight:700;box-shadow:0 10px 22px -10px rgba(0,0,0,.45);text-decoration:none}
.qr-modal-close:hover{color:var(--red)}

/* ============ 合作支持 partners 页 ============ */
.cta-row{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap}
.partner-lead{font-size:17px;color:var(--ink-soft);margin:14px 0 0;max-width:60ch}
.buy .partner-lead{color:rgba(255,255,255,.9)}
.partner-grid{grid-template-columns:repeat(2,1fr)}
.partner-steps{max-width:720px}
.partner-steps .dot{background:var(--grad-ro);color:#fff}
@media(max-width:900px){.partner-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.partner-grid{grid-template-columns:1fr}}

/* ============ 加入我们 careers 页 ============ */
.job-list{max-width:820px}
.job-list h3{font-weight:600;line-height:1.5}
.job-note{margin-top:28px!important}
.job-subject{color:rgba(255,255,255,.9);font-size:14px;margin:14px 0 0}
.job-subject b{color:#fff}

/* ============ 电子书插图 ============ */
.bk-figure{margin:28px 0 34px;border-radius:16px;overflow:hidden;box-shadow:0 24px 46px -26px rgba(33,28,24,.4);border:1px solid var(--line)}
.bk-figure img{width:100%;display:block}