:root{
    --ink-black:#0b1613;
    --ink-black-2:#101f1b;
    --gold:#e8c14e;
    --gold-dim:#b89544;
    --blue:#4f93b3;
    --blue-dim:#6fa8c2;
    --green:#4fa373;
    --green-dim:#6bb98d;
    --parchment:#eef2ec;
    --parchment-dim:#b7c4bd;
    --stone:#51625c;
    --stone-line: rgba(238,242,236,0.13);
    --max-w: 1180px;
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--ink-black);
    color:var(--parchment);
    font-family:'Source Serif 4', Georgia, serif;
    font-size:17px;
    line-height:1.65;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.display{
    font-family:'Fraunces', Georgia, serif;
    font-weight:500;
    letter-spacing:-0.01em;
    color:var(--parchment);
  }
  .mono{
    font-family:'IBM Plex Mono', monospace;
    letter-spacing:0.06em;
    text-transform:uppercase;
  }
  a{color:inherit;}
  img{max-width:100%; display:block;}
  .wrap{max-width:var(--max-w); margin:0 auto; padding:0 32px;}
  section{position:relative;}

  /* ---------- NAV ---------- */
  header.site-nav{
    position:sticky; top:0; z-index:50;
    background:rgba(21,18,14,0.88);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--stone-line);
  }
  .nav-inner{
    max-width:var(--max-w); margin:0 auto; padding:18px 32px;
    display:flex; align-items:center; justify-content:space-between;
  }
  .brand{display:flex; align-items:center; gap:10px; font-family:'Fraunces',serif; font-size:16px; font-weight:500;}
  .brand-mark{
    width:30px; height:auto; object-fit:contain; flex-shrink:0;
  }
  nav.links{display:flex; gap:34px; font-family:'IBM Plex Mono',monospace; font-size:12px; letter-spacing:0.08em; text-transform:uppercase;}
  nav.links a{text-decoration:none; color:var(--parchment-dim); transition:color .2s;}
  nav.links a:hover{color:var(--gold);}
  @media (max-width:760px){ nav.links{display:none;} }

  /* ---------- HERO ---------- */
  .hero{
    padding:96px 0 90px;
    background:
      radial-gradient(ellipse 900px 500px at 78% -10%, rgba(79,147,179,0.14), transparent 60%),
      radial-gradient(ellipse 700px 400px at 10% 100%, rgba(79,163,115,0.09), transparent 60%),
      linear-gradient(180deg, var(--ink-black) 0%, var(--ink-black-2) 100%);
    overflow:hidden;
  }
  .hero-grid{
    display:grid; grid-template-columns: 1.15fr 0.85fr; gap:64px; align-items:center;
  }
  @media (max-width:900px){ .hero-grid{grid-template-columns:1fr; gap:48px;} }
  .eyebrow{
    font-family:'IBM Plex Mono',monospace; font-size:12px; letter-spacing:0.14em; text-transform:uppercase;
    color:var(--gold); margin-bottom:22px; display:flex; align-items:center; gap:10px;
  }
  .eyebrow::before{content:''; width:26px; height:1px; background:var(--gold);}
  .hero h1{
    font-size:clamp(34px, 4.6vw, 54px); line-height:1.08; font-weight:500; margin-bottom:28px;
  }
  .hero h1 em{font-style:italic; color:var(--gold); font-weight:400;}
  .hero p.lede{
    font-size:19px; color:var(--parchment-dim); max-width:46ch; margin-bottom:36px;
  }
  .cta-row{display:flex; gap:18px; flex-wrap:wrap;}
  .btn{
    display:inline-block; padding:14px 26px; font-family:'IBM Plex Mono',monospace;
    font-size:12px; letter-spacing:0.08em; text-transform:uppercase; text-decoration:none;
    border:1px solid var(--gold); color:var(--ink-black); background:var(--gold);
    transition:all .2s;
  }
  .btn:hover{background:transparent; color:var(--gold);}
  .btn.ghost{background:transparent; color:var(--parchment); border-color:var(--stone-line);}
  .btn.ghost:hover{border-color:var(--gold); color:var(--gold);}

  .cover-frame{
    position:relative; display:flex; justify-content:center;
  }
  .cover-frame img{
    width:100%; max-width:340px; box-shadow: 0 40px 80px -20px rgba(0,0,0,0.7), 0 0 0 1px rgba(224,165,60,0.15);
  }

  /* ---------- THESIS STRIP ---------- */
  .thesis{
    padding:70px 0; border-top:1px solid var(--stone-line); border-bottom:1px solid var(--stone-line);
    background:var(--ink-black-2);
  }
  .thesis .wrap{max-width:820px; text-align:center;}
  .thesis h2{
    font-size:clamp(22px,3vw,30px); font-style:italic; font-weight:400; line-height:1.4; color:var(--parchment);
  }
  .thesis h2 .q{color:var(--gold); font-style:normal; display:block; font-family:'IBM Plex Mono',monospace; font-size:13px; letter-spacing:0.1em; text-transform:uppercase; margin-bottom:18px;}

  /* ---------- FRAMEWORK ---------- */
  .framework{padding:110px 0;}
  .section-head{max-width:640px; margin-bottom:64px;}
  .section-head .mono{color:var(--gold); font-size:12px; margin-bottom:16px; display:block;}
  .section-head h2{font-size:clamp(28px,3.6vw,40px); margin-bottom:18px;}
  .section-head p{color:var(--parchment-dim); font-size:16px;}

  .piers{
    display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--stone-line);
    border:1px solid var(--stone-line);
  }
  @media (max-width:820px){ .piers{grid-template-columns:1fr 1fr;} }
  @media (max-width:520px){ .piers{grid-template-columns:1fr;} }
  .pier{
    background:var(--ink-black); padding:38px 26px 34px; position:relative;
  }
  .pier .num{font-family:'IBM Plex Mono',monospace; color:var(--gold-dim); font-size:12px; margin-bottom:26px; display:block;}
  .pier svg{width:100%; height:70px; margin-bottom:24px;}
  .pier h3{font-size:18px; margin-bottom:12px; line-height:1.3;}
  .pier p{font-size:14.5px; color:var(--parchment-dim); line-height:1.6;}

  .presumption{
    margin-top:70px; border:1px solid var(--stone-line); padding:44px 48px;
    display:grid; grid-template-columns: 200px 1fr; gap:40px; align-items:start;
  }
  @media (max-width:700px){ .presumption{grid-template-columns:1fr; gap:18px;} }
  .presumption .label{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--gold); letter-spacing:0.08em; text-transform:uppercase;}
  .presumption p{color:var(--parchment-dim); font-size:16.5px;}
  .presumption p strong{color:var(--parchment); font-weight:500;}

  /* ---------- ABOUT BOOK ---------- */
  .about-book{padding:110px 0; background:var(--ink-black-2); border-top:1px solid var(--stone-line); border-bottom:1px solid var(--stone-line);}
  .book-grid{display:grid; grid-template-columns:0.9fr 1.1fr; gap:70px;}
  @media (max-width:860px){ .book-grid{grid-template-columns:1fr;} }
  .book-grid p{color:var(--parchment-dim); margin-bottom:18px; font-size:16px;}
  .toc{margin-top:30px;}
  .toc-item{
    display:flex; justify-content:space-between; gap:20px; padding:13px 0;
    border-bottom:1px solid var(--stone-line); font-size:14.5px;
  }
  .toc-item .n{font-family:'IBM Plex Mono',monospace; color:var(--gold-dim); min-width:26px;}
  .toc-item .t{flex:1; color:var(--parchment-dim);}

  /* ---------- EXCERPT ---------- */
  .excerpt{padding:110px 0;}
  .excerpt-box{
    max-width:760px; margin:0 auto; border:1px solid var(--stone-line); padding:56px 60px;
    background:linear-gradient(180deg, rgba(224,165,60,0.03), transparent);
  }
  @media (max-width:640px){ .excerpt-box{padding:38px 26px;} }
  .excerpt-box .tag{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--gold); letter-spacing:0.08em; text-transform:uppercase; margin-bottom:8px; display:block;}
  .excerpt-box h3{font-size:24px; margin-bottom:26px;}
  .excerpt-box p{margin-bottom:18px; color:var(--parchment-dim); font-size:16.5px;}
  .excerpt-box p.drop::first-letter{
    font-family:'Fraunces',serif; font-size:56px; float:left; line-height:0.8; padding-right:10px; padding-top:6px; color:var(--gold);
  }
  .excerpt-fade{
    margin-top:6px; padding-top:22px; border-top:1px solid var(--stone-line);
    display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px;
  }
  .excerpt-fade span{color:var(--stone); font-size:13px; font-style:italic;}

  /* ---------- AUTHOR ---------- */
  .author{padding:110px 0; background:var(--ink-black-2); border-top:1px solid var(--stone-line); border-bottom:1px solid var(--stone-line);}
  .author-grid{display:grid; grid-template-columns:220px 1fr; gap:56px; align-items:start;}
  @media (max-width:700px){ .author-grid{grid-template-columns:1fr;} }
  .author-portrait{
    width:100%; aspect-ratio:1; border:1px solid var(--stone-line);
    display:flex; align-items:center; justify-content:center;
    font-family:'Fraunces',serif; color:var(--stone); font-size:13px; text-align:center; padding:20px;
    background: repeating-linear-gradient(45deg, rgba(241,232,214,0.02) 0 2px, transparent 2px 14px);
  }
  .author h2{font-size:26px; margin-bottom:6px;}
  .author .role{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--gold); text-transform:uppercase; letter-spacing:0.08em; margin-bottom:22px; display:block;}
  .author p{color:var(--parchment-dim); font-size:16px; margin-bottom:16px;}

  /* ---------- ECOSYSTEM ---------- */
  .ecosystem{padding:110px 0;}
  .eco-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--stone-line); border:1px solid var(--stone-line); margin-top:50px;}
  @media (max-width:820px){ .eco-grid{grid-template-columns:1fr;} }
  .eco-card{background:var(--ink-black); padding:36px 32px; display:flex; flex-direction:column; gap:14px;}
  .eco-card .mono{color:var(--gold-dim); font-size:11px;}
  .eco-card h3{font-size:19px;}
  .eco-card p{color:var(--parchment-dim); font-size:14.5px; flex:1;}
  .eco-card a.link{
    font-family:'IBM Plex Mono',monospace; font-size:12px; text-transform:uppercase; letter-spacing:0.06em;
    color:var(--gold); text-decoration:none; border-bottom:1px solid var(--gold-dim); padding-bottom:2px; width:fit-content;
  }
  .eco-card a.link:hover{color:var(--parchment);}

  /* ---------- FOOTER ---------- */
  footer{padding:70px 0 50px; border-top:1px solid var(--stone-line);}
  .footer-grid{display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap:30px;}
  footer .brand{margin-bottom:14px;}
  footer p{color:var(--stone); font-size:13.5px; max-width:38ch;}
  footer a.mail{color:var(--gold); text-decoration:none; font-family:'IBM Plex Mono',monospace; font-size:13px;}
  .footer-links{display:flex; gap:26px; font-family:'IBM Plex Mono',monospace; font-size:12px; text-transform:uppercase; letter-spacing:0.06em;}
  .footer-links a{color:var(--parchment-dim); text-decoration:none;}
  .footer-links a:hover{color:var(--gold);}