:root{
  --bg:#0F0F0F;
  --nav-bg:#160e19;
  --surface:#141414;
  --surface-alt:#1A1A1A;
  --surface-deep:#1d1d1d;
  --border:#2A2A2A;
  --border-soft:#232323;
  --accent:#09FFFF;
  --accent-alt:#00CED1;
  --green:#5DB878;
  --green-surface:#1E2E22;
  --green-border:#3D6B4F;
  --amber:#D4A853;
  --orange:#CC8844;
  --red:#CC5555;
  --wind:#6AAECC;
  --text:#E2E2E2;
  --text-dim:#9a9a9a;
  --text-faint:#6f6f6f;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,.disp{
  font-family:'Oswald',sans-serif;
  text-transform:uppercase;
  letter-spacing:0.02em;
  margin:0;
  color:#fff;
}
p{margin:0 0 1em 0;}
a{color:var(--accent-alt);}
.mono{font-family:'JetBrains Mono','SF Mono',ui-monospace,Menlo,Consolas,monospace;}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}
.eyebrow{
  font-family:'Oswald',sans-serif;
  text-transform:uppercase;
  letter-spacing:0.18em;
  font-size:12.5px;
  color:var(--accent);
  font-weight:500;
  margin-bottom:14px;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:'';
  width:22px;height:1px;
  background:var(--accent);
  display:inline-block;
}

/* ── NAV ───────────────────────────────────────────── */
nav{
  position:sticky;top:0;z-index:100;
  background:rgba(15,15,15,0.86);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border-soft);
}
.nav-inner{
  max-width:1120px;margin:0 auto;padding:16px 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{
  font-family:'Oswald',sans-serif;
  font-weight:700;
  font-size:19px;
  letter-spacing:0.04em;
  color:#fff;
  text-decoration:none;
  display:flex;align-items:center;gap:10px;
}
.nav-logo span{color:var(--accent);}
.nav-icon{height:26px;width:auto;display:block;}
.nav-links{display:flex;gap:8px;list-style:none;margin:0;padding:0;}
.nav-links a{
  color:var(--text-dim);
  text-decoration:none;
  font-size:13.5px;
  font-weight:500;
  letter-spacing:0.03em;
  text-transform:uppercase;
  font-family:'Oswald',sans-serif;
  transition:color .15s, background .15s;
  padding:8px 14px;
  border-radius:6px;
}
.nav-links a:hover{color:#fff;background:var(--surface-alt);}
.nav-links a.active{color:var(--bg);background:var(--accent);}
.nav-tag{
  font-size:11px;
  color:var(--text-faint);
  font-family:'JetBrains Mono',monospace;
  border:1px solid var(--border);
  padding:5px 10px;
  border-radius:20px;
  display:none;
}
@media(min-width:860px){.nav-tag{display:block;}}
@media(max-width:640px){.nav-links a{font-size:11.5px;padding:8px 10px;}}

/* ── PAGE HEADER (subpages) ───────────────────────────
   Replaces the old "Part One / Part Two" book-chapter framing —
   each page is its own destination with its own big title. */
.page-header{
  padding:64px 0 54px;
  border-bottom:1px solid var(--border-soft);
  background:
    radial-gradient(ellipse 800px 420px at 10% -20%, rgba(9,255,255,0.05), transparent 60%);
}
.page-header .kicker{
  font-family:'JetBrains Mono',monospace;
  font-size:12.5px;
  color:var(--text-dim);
  margin-bottom:10px;
  letter-spacing:0.02em;
}
.page-header h1{font-size:clamp(38px,7vw,64px);line-height:0.98;margin-bottom:16px;}
.page-header .sub{font-size:16.5px;color:#c4c4c4;max-width:720px;}
.page-header .sub b{color:#fff;}

/* ── HOME HERO ─────────────────────────────────────── */
header.hero{
  padding:88px 0 0;
  position:relative;
  border-bottom:1px solid var(--border-soft);
  background:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(9,255,255,0.06), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 10%, rgba(93,184,120,0.05), transparent 60%);
}
.hero-grid{
  display:grid;grid-template-columns:1fr 340px;gap:48px;align-items:center;
  padding-bottom:56px;
}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr;}}
.hero-icon{height:56px;width:auto;opacity:0.92;margin-bottom:22px;}
.hero h1{font-size:clamp(44px,7vw,72px);line-height:0.98;margin-bottom:8px;}
.hero-tagline{
  font-family:'Oswald',sans-serif;
  text-transform:uppercase;
  letter-spacing:0.03em;
  font-size:clamp(16px,2.4vw,20px);
  font-weight:500;
  color:var(--accent);
  margin-bottom:22px;
}
.hero .lede{
  font-size:clamp(16.5px,2.2vw,19.5px);
  color:#cfcfcf;
  font-weight:400;
  max-width:600px;
  margin-bottom:14px;
}
.hero .lede b{color:#fff;font-weight:600;}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;}
.badge{
  font-family:'JetBrains Mono',monospace;
  font-size:12px;
  color:var(--text-dim);
  border:1px solid var(--border);
  background:var(--surface);
  padding:8px 14px;
  border-radius:6px;
  display:flex;align-items:center;gap:8px;
}
.badge .dot{width:6px;height:6px;border-radius:50%;background:var(--green);flex:none;}

/* ── SHOT FRAMES (real screenshots) ───────────────────
   Default: natural aspect ratio, no forced cropping — a screenshot's
   own shape (square overlay, landscape card, tall phone capture)
   decides its box. .phone caps width so a full-height phone capture
   doesn't stretch absurdly tall inside an article column. .zoom crops
   into a fixed square and scales up, for two overlays that read as
   too spread-out at their native framing. */
.shot-frame{
  border:1px solid var(--border);
  border-radius:10px;
  background:var(--surface);
  overflow:hidden;
  display:block;
}
.shot-frame img{display:block;width:100%;height:auto;}
.shot-frame.phone{max-width:300px;margin:0 auto;}
.shot-frame.phone-lg{max-width:360px;}
.shot-frame.zoom{aspect-ratio:1/1;position:relative;}
.shot-frame.zoom img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  transform:scale(1.22);transform-origin:center;
}
.shot-caption{
  font-family:'JetBrains Mono',monospace;font-size:11px;color:var(--text-faint);
  margin-top:8px;text-align:center;
}
.shot-placeholder{
  aspect-ratio:16/9.5;
  display:flex;align-items:center;justify-content:center;
  color:var(--text-faint);
  font-family:'JetBrains Mono',monospace;
  font-size:12.5px;
  background:
    repeating-linear-gradient(135deg, #161616, #161616 10px, #131313 10px, #131313 20px);
  text-align:center;padding:20px;
}
.shot-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start;}
@media(max-width:700px){.shot-row{grid-template-columns:1fr;}}

/* Model card with a column of images beside the text (Stand Placement) */
.stand-split{display:grid;grid-template-columns:1fr 240px;gap:28px;align-items:start;}
.stand-split .imgs{display:flex;flex-direction:column;gap:16px;}
@media(max-width:760px){
  .stand-split{grid-template-columns:1fr;}
  .stand-split .imgs{flex-direction:row;}
}
@media(max-width:560px){
  .stand-split .imgs{flex-direction:column;}
}

/* ── SECTION SCAFFOLD ─────────────────────────────── */
section{padding:76px 0;border-bottom:1px solid var(--border-soft);}
section.tight{padding:56px 0;}
section.first{padding-top:0;}
.section-head{max-width:700px;margin-bottom:44px;}
.section-head h2{font-size:clamp(28px,4.6vw,40px);line-height:1.04;margin-bottom:16px;}
.section-head .intro{font-size:16px;color:#c4c4c4;}
.section-head .intro b{color:#fff;}

/* ── HOME: EXPLORE GRID ───────────────────────────── */
.explore-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
@media(max-width:760px){.explore-grid{grid-template-columns:1fr;}}
.explore-card{
  border:1px solid var(--border);border-radius:12px;background:var(--surface);
  padding:0;overflow:hidden;text-decoration:none;display:block;
  transition:border-color .15s, transform .15s;
}
.explore-card:hover{border-color:var(--accent-alt);transform:translateY(-2px);}
.explore-card .thumb{aspect-ratio:16/10;overflow:hidden;background:var(--surface-deep);position:relative;}
.explore-card .thumb img{width:100%;height:100%;object-fit:cover;object-position:center 20%;display:block;}
.explore-card .num{
  position:absolute;top:14px;left:14px;
  font-family:'Oswald',sans-serif;font-size:13px;font-weight:600;
  color:var(--accent);background:rgba(15,15,15,0.8);border:1px solid var(--border);
  padding:4px 10px;border-radius:20px;letter-spacing:0.05em;
}
.explore-card .body{padding:22px 24px 26px;}
.explore-card h3{font-size:21px;margin-bottom:8px;color:#fff;}
.explore-card p{font-size:14px;color:#b8b8b8;margin-bottom:0;}
.explore-card .go{
  margin-top:14px;font-family:'JetBrains Mono',monospace;font-size:12px;
  color:var(--accent-alt);display:flex;align-items:center;gap:6px;
}

/* ── MODEL CARDS ──────────────────────────────────── */
.model{
  display:grid;
  grid-template-columns:56px 1fr;
  gap:24px;
  padding:36px 0;
  border-top:1px solid var(--border-soft);
}
.model:first-of-type{border-top:none;}
.model-num{
  font-family:'Oswald',sans-serif;
  font-size:15px;
  font-weight:600;
  color:var(--bg);
  background:var(--accent);
  width:38px;height:38px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
}
.model h3{font-size:24px;margin-bottom:4px;}
.model .hook{color:var(--text-dim);font-size:14.5px;font-style:italic;margin-bottom:16px;}
.model p{font-size:15px;color:#c9c9c9;}
.model p strong{color:#fff;}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.cite-chip{
  font-size:11.5px;
  font-family:'JetBrains Mono',monospace;
  color:var(--text-dim);
  border:1px solid var(--border);
  padding:6px 10px;
  border-radius:5px;
  text-decoration:none;
  transition:.15s;
}
.cite-chip:hover{border-color:var(--accent-alt);color:var(--accent-alt);}
.cite-chip::before{content:'↗ ';opacity:.5;}

.shot-inline{margin-top:18px;}

@media(max-width:640px){
  .model{grid-template-columns:1fr;}
  .model-num{margin-bottom:4px;}
}

/* ── GATE ─────────────────────────────────────────── */
.gate-trigger{
  margin-top:50px;
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.gate-btn{
  font-family:'Oswald',sans-serif;
  text-transform:uppercase;
  letter-spacing:0.05em;
  font-size:13.5px;
  font-weight:600;
  color:var(--bg);
  background:var(--accent);
  border:none;
  padding:14px 24px;
  border-radius:6px;
  cursor:pointer;
  display:flex;align-items:center;gap:10px;
  transition:transform .12s, box-shadow .12s;
}
.gate-btn:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(9,255,255,0.18);}
.gate-btn:active{transform:translateY(0);}
.gate-note{font-size:12px;color:var(--text-faint);font-family:'JetBrains Mono',monospace;}

.gate-panel{
  display:none;
  margin-top:24px;
  border:1px solid var(--border);
  border-radius:10px;
  background:var(--surface);
  overflow:hidden;
}
.gate-panel.open{display:block;}
.gate-lock{
  padding:34px 30px;
  display:flex;flex-direction:column;gap:14px;align-items:flex-start;
  background:
    repeating-linear-gradient(135deg, #151515, #151515 10px, #121212 10px, #121212 20px);
}
.gate-lock.hidden{display:none;}
.gate-lock p{color:var(--text-dim);font-size:14px;max-width:480px;margin:0;}
.gate-form{display:flex;gap:10px;flex-wrap:wrap;}
.gate-form input{
  background:var(--bg);
  border:1px solid var(--border);
  color:#fff;
  padding:11px 14px;
  border-radius:6px;
  font-family:'JetBrains Mono',monospace;
  font-size:14px;
  width:180px;
  letter-spacing:0.1em;
}
.gate-form input:focus{outline:none;border-color:var(--accent-alt);}
.gate-form button{
  background:transparent;
  border:1px solid var(--accent);
  color:var(--accent);
  padding:11px 20px;
  border-radius:6px;
  font-family:'Oswald',sans-serif;
  text-transform:uppercase;
  letter-spacing:0.04em;
  font-size:12.5px;
  font-weight:600;
  cursor:pointer;
}
.gate-form button:hover{background:rgba(9,255,255,0.08);}
.gate-error{color:var(--red);font-size:12.5px;font-family:'JetBrains Mono',monospace;display:none;}
.gate-error.show{display:block;}
.shake{animation:shake .35s;}
@keyframes shake{
  10%,90%{transform:translateX(-1px);}
  20%,80%{transform:translateX(2px);}
  30%,50%,70%{transform:translateX(-4px);}
  40%,60%{transform:translateX(4px);}
}

.gate-content{padding:8px 30px 34px;}
.gate-content.hidden{display:none;}
.math-block{margin-top:30px;}
.math-block:first-child{margin-top:26px;}
.math-block h4{
  font-size:16px;color:var(--accent);
  display:flex;align-items:center;gap:10px;
  margin-bottom:6px;
  padding-top:26px;
  border-top:1px solid var(--border-soft);
}
.math-block:first-child h4{border-top:none;padding-top:0;}
.math-block .src{
  font-size:11px;color:var(--text-faint);font-family:'JetBrains Mono',monospace;
  margin-bottom:14px;
}
.math-block p{font-size:14px;color:#bdbdbd;}
.math-block ul{margin:0 0 14px 0;padding-left:20px;font-size:13.5px;color:#bdbdbd;}
.math-block li{margin-bottom:8px;}
.formula{
  background:var(--bg);
  border:1px solid var(--border);
  border-left:3px solid var(--accent-alt);
  border-radius:0 6px 6px 0;
  padding:14px 16px;
  font-family:'JetBrains Mono',monospace;
  font-size:12.5px;
  color:#a8dede;
  overflow-x:auto;
  white-space:pre;
  margin:10px 0 16px;
  line-height:1.65;
}
.formula .c{color:var(--text-faint);}
.formula .k{color:var(--amber);}
table.spec{
  width:100%;border-collapse:collapse;font-size:12.5px;margin:12px 0 18px;
  font-family:'JetBrains Mono',monospace;
}
table.spec th,table.spec td{
  text-align:left;padding:8px 10px;border-bottom:1px solid var(--border-soft);
  color:#c2c2c2;
}
table.spec th{color:var(--text-faint);font-weight:500;text-transform:uppercase;font-size:10.5px;letter-spacing:.05em;}
.flag{
  margin-top:10px;
  border:1px solid var(--green-border);
  background:var(--green-surface);
  border-radius:6px;
  padding:10px 14px;
  font-size:12.5px;
  color:#bcd9c4;
}
.flag b{color:var(--green);}

/* ── shared layout bits ── */
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
@media(max-width:760px){.twocol{grid-template-columns:1fr;}}
.twocol.align-center{align-items:center;}
.infobox{
  border:1px solid var(--border);background:var(--surface);border-radius:10px;padding:26px;
}
.infobox h4{color:#fff;font-size:16px;margin-bottom:10px;}
.infobox p{font-size:14px;color:#c2c2c2;}

footer{padding:60px 0 40px;}
footer .wrap{display:flex;flex-direction:column;gap:18px;}
footer .fine{font-size:12px;color:var(--text-faint);line-height:1.7;}
footer .fine a{color:var(--text-dim);}
footer .logo{font-family:'Oswald',sans-serif;font-weight:700;font-size:16px;color:#fff;}
.footer-icon{height:22px;width:auto;}
.logo-row{display:flex;align-items:center;gap:10px;}
footer .foot-links{display:flex;gap:18px;font-family:'JetBrains Mono',monospace;font-size:12px;}
footer .foot-links a{color:var(--text-dim);}
footer .foot-links a:hover{color:var(--accent-alt);}