:root{
  --bg:#020912;
  --bg2:#06111d;
  --panel:#071522;
  --panel2:#0a1927;
  --text:#f2f4f6;
  --muted:#a9b4be;
  --line:#213849;
  --cyan:#48c9f2;
  --cyan2:#79dcf7;
  --max:1280px;
  --reading:780px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:
  radial-gradient(circle at 50% -20%,#10243a 0,transparent 38%),
  var(--bg);
  color:var(--text);
  font-family:Arial,Helvetica,sans-serif;
  line-height:1.65;
}
a{color:inherit}
.wrap{width:min(calc(100% - 48px),var(--max));margin:auto}
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(2,9,18,.92);backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(72,201,242,.15)
}
.header-inner{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:flex;align-items:center;gap:16px;text-decoration:none}
.brand img{width:64px;height:64px;border-radius:50%;object-fit:cover}
.brand-copy{display:block}
.brand-name{font-size:25px;letter-spacing:.22em;font-weight:300;white-space:nowrap}
.brand-name em{font-style:normal;color:var(--cyan)}
.brand-tag{display:block;margin-top:3px;font-size:8px;letter-spacing:.25em;color:#d9dde1}
.nav{display:flex;gap:30px;align-items:center}
.nav a{text-decoration:none;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#e7ebef}
.nav a:hover{color:var(--cyan)}
.hero-brand{
  min-height:530px;
  background-image:
    linear-gradient(90deg,rgba(2,9,18,.14),rgba(2,9,18,.02)),
    url("think-deeper-banner.webp");
  background-size:cover;background-position:center;
  border-bottom:1px solid var(--line);
  position:relative;
}
.hero-brand::after{
  content:"";position:absolute;inset:auto 0 0;height:130px;
  background:linear-gradient(transparent,var(--bg));
}
.hero-overlay{
  min-height:530px;display:flex;align-items:flex-end;padding-bottom:78px;position:relative;z-index:2
}
.hero-statement{
  max-width:650px;padding:24px 28px;background:rgba(1,7,13,.72);
  border-left:2px solid var(--cyan);backdrop-filter:blur(8px)
}
.hero-statement p{margin:0;font-size:13px;letter-spacing:.18em;text-transform:uppercase;color:#d8e2e9}
.hero-statement strong{display:block;margin-top:8px;font-size:25px;letter-spacing:.09em;font-weight:300}
.principles{margin-top:-34px;position:relative;z-index:4}
.principle-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  background:linear-gradient(135deg,rgba(8,25,39,.97),rgba(4,15,25,.97));
  border:1px solid var(--line);box-shadow:0 22px 70px rgba(0,0,0,.35)
}
.principle{padding:30px;border-right:1px solid var(--line)}
.principle:last-child{border-right:0}
.principle .icon{color:var(--cyan);font-size:24px;margin-bottom:14px}
.principle h3{margin:0 0 7px;color:var(--cyan);font-size:11px;letter-spacing:.13em;text-transform:uppercase}
.principle p{margin:0;color:#d7dee4;font-size:14px}
.section{padding:76px 0;border-bottom:1px solid rgba(33,56,73,.75)}
.section-title,.kicker{
  margin:0 0 25px;color:var(--cyan);font-size:11px;font-weight:700;
  letter-spacing:.18em;text-transform:uppercase
}
.feature-shell{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(300px,.7fr);gap:42px}
.feature-card{text-decoration:none;display:block}
.feature-card .num{color:var(--cyan);font-size:12px;letter-spacing:.16em;font-weight:700;margin-bottom:18px}
.feature-card h2{font-family:Georgia,"Times New Roman",serif;font-weight:400;font-size:clamp(45px,6vw,76px);line-height:1;margin:0 0 14px}
.feature-card .subtitle{font-family:Georgia,serif;font-style:italic;font-size:22px;color:#e4e8eb;margin-bottom:24px}
.feature-card p{color:#c1cbd3;font-family:Georgia,serif;font-size:18px;max-width:760px}
.button{
  display:inline-block;margin-top:20px;padding:13px 22px;border:1px solid var(--cyan);
  color:var(--bg);background:var(--cyan);text-decoration:none;
  font-size:11px;font-weight:800;letter-spacing:.15em;text-transform:uppercase
}
.method-box{background:var(--panel);border:1px solid var(--line);padding:30px}
.method-box h3{margin:0 0 22px;color:var(--cyan);font-size:13px;letter-spacing:.14em;text-transform:uppercase}
.method-item{margin:0 0 21px;padding-left:18px;border-left:1px solid var(--cyan)}
.method-item strong{display:block;color:var(--cyan2);font-size:10px;letter-spacing:.12em;text-transform:uppercase}
.method-item span{color:#d5dce2;font-family:Georgia,serif;font-size:15px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--panel);border:1px solid var(--line);padding:26px}
.card .label{color:var(--cyan);font-size:10px;letter-spacing:.13em;text-transform:uppercase;font-weight:700}
.card h3{font-family:Georgia,serif;font-size:25px;line-height:1.2;font-weight:400;margin:13px 0}
.card p{color:var(--muted);font-family:Georgia,serif}
.article-head{padding:92px 0 60px;background:linear-gradient(180deg,#061421,var(--bg));border-bottom:1px solid var(--line)}
.article-head h1,.page h1{font-family:Georgia,serif;font-size:clamp(52px,8vw,92px);line-height:.98;font-weight:400;margin:0}
.article-head .dek,.page .dek{font-family:Georgia,serif;font-size:25px;font-style:italic;color:#d5dde3;max-width:850px}
.article-meta{display:flex;flex-wrap:wrap;gap:18px;margin-top:28px;color:var(--muted);font-size:10px;letter-spacing:.13em;text-transform:uppercase}
.abstract{max-width:var(--reading);margin-top:38px;border-left:2px solid var(--cyan);padding:18px 24px;background:var(--panel);color:#c7d0d7;font-family:Georgia,serif}
.article{width:min(calc(100% - 48px),var(--reading));margin:auto;padding:62px 0 90px;font-family:Georgia,serif;font-size:19px;color:#e4e7e9}
.article h2{margin:4em 0 1.1em;color:var(--cyan);font-family:Arial,sans-serif;font-size:13px;letter-spacing:.14em;text-transform:uppercase}
.article .question{font-size:36px;line-height:1.22;border-left:2px solid var(--cyan);padding-left:22px}
.distinction{margin:34px 0;padding:22px 25px;border:1px solid var(--line);background:var(--panel);font-size:25px;color:#fff}
.distinction::before{content:"DISTINCTION";display:block;color:var(--cyan);font:700 9px Arial;letter-spacing:.15em;margin-bottom:9px}
.chain,.callout,.reading-note{margin:34px 0;padding:24px;border:1px solid var(--line);background:var(--panel)}
.callout strong{display:block;color:var(--cyan);font:700 10px Arial;letter-spacing:.15em;text-transform:uppercase}
.references,.source-note{color:var(--muted);font-size:15px}
.references a{color:var(--cyan2)}
.page{padding:90px 0}
.page .content{max-width:var(--reading)}
.page h2{margin-top:3em;color:var(--cyan);font-size:12px;letter-spacing:.14em;text-transform:uppercase}
.page p{font-family:Georgia,serif;font-size:18px;color:#d6dde2}
.version{border-top:1px solid var(--line);padding:20px 0}
.footer{padding:40px 0 65px;color:#8595a2;font-size:12px}
.footer-inner{display:flex;justify-content:space-between;gap:20px}
.brandline{letter-spacing:.18em;color:#dbe3e9}
@media(max-width:900px){
 .header-inner{align-items:flex-start;flex-direction:column;padding:16px 0}
 .nav{gap:16px;flex-wrap:wrap;padding-bottom:8px}
 .hero-brand{min-height:400px;background-position:center}
 .hero-overlay{min-height:400px}
 .principle-grid,.cards{grid-template-columns:1fr 1fr}
 .feature-shell{grid-template-columns:1fr}
}
@media(max-width:600px){
 .wrap{width:min(calc(100% - 28px),var(--max))}
 .brand img{width:50px;height:50px}.brand-name{font-size:17px}.brand-tag{display:none}
 .nav a{font-size:9px}.hero-brand{min-height:310px}.hero-overlay{min-height:310px;padding-bottom:38px}
 .hero-statement{display:none}
 .principles{margin-top:0}.principle-grid,.cards{grid-template-columns:1fr}.principle{border-right:0;border-bottom:1px solid var(--line)}
 .feature-card h2{font-size:44px}.article{width:calc(100% - 30px);font-size:18px}
}


/* v4: custom-domain + mobile publishing polish */
.mobile-nav-toggle { display:none; }
.header-inner { position:relative; }

@media(max-width:700px){
  .site-header{position:sticky;top:0}
  .header-inner{
    min-height:86px;
    padding:10px 0;
    flex-direction:row;
    align-items:center;
  }
  .brand{gap:12px}
  .brand img{width:50px;height:50px}
  .brand-name{font-size:18px;letter-spacing:.18em}
  .brand-tag{display:none}

  .mobile-nav-toggle{
    display:block;
    margin-left:auto;
    border:1px solid var(--line);
    background:var(--panel);
    color:var(--text);
    width:44px;height:42px;
    font-size:22px;
    line-height:40px;
    text-align:center;
    cursor:pointer;
  }
  .nav{
    display:none;
    position:absolute;
    top:78px;left:0;right:0;
    background:rgba(2,9,18,.98);
    border:1px solid var(--line);
    padding:8px 14px 16px;
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav.open{display:flex}
  .nav a{
    display:block;
    padding:16px 5px;
    border-bottom:1px solid rgba(33,56,73,.55);
    font-size:10px;
  }
  .nav a:last-child{border-bottom:0}

  .hero-brand{
    min-height:275px;
    background-position:center center;
    background-size:cover;
  }
  .hero-overlay{min-height:275px;padding:0}
  .hero-statement{display:none}

  .principles{margin-top:0}
  .principle-grid{
    grid-template-columns:1fr 1fr;
  }
  .principle{
    min-height:160px;
    padding:22px 18px;
    border-bottom:1px solid var(--line);
  }
  .principle:nth-child(2n){border-right:0}
  .principle .icon{font-size:20px;margin-bottom:10px}
  .principle h3{font-size:9px}
  .principle p{font-size:12px;line-height:1.45}

  .section{padding:52px 0}
  .feature-shell{gap:26px}
  .feature-card h2{
    font-size:46px;
    line-height:1.02;
    max-width:12ch;
  }
  .feature-card .subtitle{
    font-size:19px;
    line-height:1.35;
  }
  .feature-card p{
    font-size:16px;
    line-height:1.65;
  }
  .button{padding:12px 18px}

  .method-box{padding:24px 20px}
  .method-box h3{font-size:11px}
  .method-item{margin-bottom:17px}
  .method-item span{font-size:14px}

  .cards{grid-template-columns:1fr}
  .card{padding:24px 20px}
  .card h3{font-size:27px}
  .card p{font-size:15px}

  .article-head{padding:54px 0 40px}
  .article-head h1,.page h1{
    font-size:clamp(46px,14vw,62px);
    line-height:1;
  }
  .article-head .dek,.page .dek{
    font-size:21px;
    line-height:1.4;
  }
  .article-meta{gap:10px 14px}
  .abstract{padding:16px 18px;margin-top:28px}
  .article{
    width:calc(100% - 32px);
    padding:44px 0 72px;
    font-size:17px;
    line-height:1.78;
  }
  .article h2{margin-top:3.2em}
  .article .question{
    font-size:29px;
    padding-left:16px;
  }
  .distinction{font-size:22px;padding:19px}
  .chain,.callout,.reading-note{padding:19px}

  .footer{padding:34px 0 46px}
  .footer-inner{
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
  }
}