/* ============ TOKENS ============ */
:root{
  --paper:#FBFAF7;      /* graph paper */
  --grid:#E3E7EC;
  --grid-bold:#D3DAE3;
  --ink:#12181F;
  --muted:#5D6875;
  --rule:#DDE2E8;
  --pen:#1F4FD8;        /* ballpoint blue */
  --pen-soft:#1F4FD81A;
  --marker:#FFD84D;     /* highlighter */
  --marker-soft:#FFD84D55;
  --surface:#FFFFFF;
  --shadow:0 1px 0 var(--rule), 0 12px 40px -28px rgba(18,24,31,.5);
  --code-bg:#FFFFFF;
}
[data-theme="dark"]{
  --paper:#0E1412;      /* chalkboard */
  --grid:#18211D;
  --grid-bold:#1E2A25;
  --ink:#E9EDE7;
  --muted:#8B978E;
  --rule:#222C27;
  --pen:#8FBBFF;        /* blue chalk */
  --pen-soft:#8FBBFF1A;
  --marker:#FFE27A;     /* yellow chalk */
  --marker-soft:#FFE27A44;
  --surface:#131A17;
  --shadow:0 1px 0 var(--rule), 0 16px 50px -30px #000;
  --code-bg:#111815;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:"Source Serif 4",Georgia,serif;
  font-size:17px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
  transition:background .5s ease,color .5s ease;
  overflow-x:hidden;
}
/* graph paper / chalkboard ruling */
body::before{
  content:""; position:fixed; inset:0; z-index:0; pointer-events:none;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(var(--grid-bold) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-bold) 1px, transparent 1px);
  background-size:28px 28px,28px 28px,140px 140px,140px 140px;
  opacity:.55;
  mask-image:radial-gradient(circle at 50% 22%, #000 0%, #000 45%, transparent 88%);
  transition:opacity .5s ease;
}
[data-theme="dark"] body::before{opacity:.85}

.wrap{max-width:1080px;margin:0 auto;padding:0 24px;position:relative;z-index:1}

h1,h2,h3,.display{font-family:"Bricolage Grotesque",system-ui,sans-serif;letter-spacing:-.02em;line-height:1.05}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace}

.eyebrow{
  font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);
}
.rule{height:1px;background:var(--rule);border:0}

/* ============ NAV ============ */
nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(10px);
  background:color-mix(in srgb, var(--paper) 82%, transparent);
  border-bottom:1px solid var(--rule);
}
.nav-in{max-width:1080px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:28px}
.brand{font-family:"JetBrains Mono",monospace;font-weight:700;font-size:14.5px;letter-spacing:-.02em;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:9px}
.mark{width:24px;height:24px;flex:none;overflow:visible}
.mark .axis{fill:none;stroke:var(--rule);stroke-width:1.4;stroke-linecap:round}
.mark .curve{fill:none;stroke:var(--pen);stroke-width:1.8;stroke-linecap:round;
  stroke-dasharray:34;stroke-dashoffset:34;animation:draw .9s cubic-bezier(.4,0,.2,1) .1s forwards}
.mark .ball{fill:var(--marker);stroke:var(--pen);stroke-width:1.2;
  offset-path:path('M5 5 Q13 25 21 8');offset-distance:0%;offset-rotate:0deg;
  opacity:0;animation:roll 4.2s cubic-bezier(.45,0,.55,1) .7s infinite}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes roll{
  0%{offset-distance:0%;opacity:0}
  6%{opacity:1}
  55%{offset-distance:100%;opacity:1}
  78%{offset-distance:100%;opacity:1}
  88%,100%{offset-distance:100%;opacity:0}
}
.word{display:inline-block;min-width:118px}
.word i{font-style:normal;color:var(--pen)}
.word .cur{display:inline-block;width:6px;height:12px;background:var(--pen);vertical-align:-1px;margin-left:1px;animation:blink .9s step-end infinite}
.nav-links{margin-left:auto;display:flex;gap:26px;align-items:center}
.nav-links a{
  font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--muted);
  text-decoration:none;padding-bottom:2px;border-bottom:1px solid transparent;transition:.2s;
}
.nav-links a:hover{color:var(--ink);border-bottom-color:var(--pen)}
.toggle{
  width:34px;height:34px;border:1px solid var(--rule);background:transparent;border-radius:50%;
  cursor:pointer;display:grid;place-items:center;color:var(--ink);transition:.25s;flex:none;
}
.toggle:hover{border-color:var(--pen);transform:rotate(-18deg)}
.toggle svg{width:15px;height:15px}
.sun{display:none}
[data-theme="dark"] .sun{display:block}
[data-theme="dark"] .moon{display:none}
@media(max-width:760px){.nav-links a{display:none}}

/* ============ HERO ============ */
header{padding:88px 0 64px}
h1{font-size:clamp(38px,6.4vw,72px);font-weight:800;margin:18px 0 0}
h1 .line{display:block;overflow:hidden;padding-bottom:.14em}
h1 .w{
  display:inline-block;margin-right:.22em;position:relative;
  opacity:0;transform:translateY(1.05em) rotate(2deg);
  animation:wordrise 12s cubic-bezier(.16,.84,.28,1) infinite;animation-delay:var(--d);
}
@keyframes wordrise{
  0%{opacity:0;transform:translateY(1.05em) rotate(2deg)}
  5%,90%{opacity:1;transform:none}
  96%{opacity:0;transform:translateY(-.5em) rotate(-1deg)}
  96.01%,100%{opacity:0;transform:translateY(1.05em) rotate(2deg)}
}
/* line 2 starts ~2.1s later, so it exits earlier on its own timeline
   in order to vanish at the same wall-clock moment as line 1 */
h1 .line:last-child .w{animation-name:wordrise2}
@keyframes wordrise2{
  0%{opacity:0;transform:translateY(1.05em) rotate(2deg)}
  5%,72%{opacity:1;transform:none}
  78.5%{opacity:0;transform:translateY(-.5em) rotate(-1deg)}
  78.51%,100%{opacity:0;transform:translateY(1.05em) rotate(2deg)}
}
h1 .w.strike{color:var(--muted);font-weight:600}
h1 .w.strike::after{
  content:"";position:absolute;left:-.04em;right:-.04em;top:56%;height:3px;
  background:var(--pen);border-radius:3px;transform:scaleX(0) rotate(-.7deg);transform-origin:left;
  animation:strike 12s cubic-bezier(.5,0,.3,1) infinite;
}
h1 .w.strike:nth-of-type(3)::after{animation-delay:1.25s}
h1 .w.strike:nth-of-type(4)::after{animation-delay:1.42s}
h1 .w.strike:nth-of-type(5)::after{animation-delay:1.56s}
@keyframes strike{
  0%{transform:scaleX(0) rotate(-.7deg)}
  3%,84%{transform:scaleX(1) rotate(-.7deg)}
  88%,100%{transform:scaleX(0) rotate(-.7deg)}
}
h1 .uw{position:relative;display:inline-block}
h1 .sq{position:absolute;left:0;bottom:-.03em;width:100%;height:.24em;overflow:visible}
h1 .sq path{
  fill:none;stroke:var(--marker);stroke-width:5;stroke-linecap:round;
  stroke-dasharray:210;stroke-dashoffset:210;
  animation:squiggle 12s cubic-bezier(.35,.7,.3,1) 3.35s infinite;
}
[data-theme="light"] h1 .sq path{stroke:var(--pen)}
@keyframes squiggle{
  0%{stroke-dashoffset:210}
  6%,62%{stroke-dashoffset:0}
  69%,100%{stroke-dashoffset:210}
}
.lede{
  font-size:19px;color:var(--muted);max-width:52ch;margin-top:22px;
}
.lede b{color:var(--ink);font-weight:600}

/* SIGNATURE: derive → collapse */
.derive{
  margin-top:44px;display:grid;grid-template-columns:1fr 44px 1fr;gap:0;align-items:stretch;
}
@media(max-width:860px){.derive{grid-template-columns:1fr;gap:0}}
.pane{
  background:var(--code-bg);border:1px solid var(--rule);box-shadow:var(--shadow);
  padding:18px 20px 20px;position:relative;
}
.pane.left{border-radius:10px 0 0 10px}
.pane.right{border-radius:0 10px 10px 0;display:flex;flex-direction:column;justify-content:center}
@media(max-width:860px){
  .pane.left{border-radius:10px 10px 0 0}
  .pane.right{border-radius:0 0 10px 10px;border-top:0;padding:24px 20px}
}
.pane-tag{
  font-family:"JetBrains Mono",monospace;font-size:10px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);margin-bottom:14px;display:flex;justify-content:space-between;
}
.pane-tag em{font-style:normal;color:var(--pen)}
pre{
  font-family:"JetBrains Mono",monospace;font-size:12.5px;line-height:1.75;
  color:var(--ink);white-space:pre;overflow-x:auto;
}
pre .k{color:var(--pen)}
pre .c{color:var(--muted)}
.caret{display:inline-block;width:7px;height:14px;background:var(--pen);vertical-align:-2px;animation:blink .9s step-end infinite}
@keyframes blink{50%{opacity:0}}
.arrow{
  display:grid;place-items:center;color:var(--muted);font-family:"JetBrains Mono",monospace;font-size:18px;
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--paper);
  opacity:0;transition:opacity .5s ease;
}
.arrow.show{opacity:1}
@media(max-width:860px){.arrow{border:1px solid var(--rule);border-left:0;border-right:0;padding:10px 0;transform:rotate(90deg) scale(.9)}}
.collapse{opacity:1}
.collapse code{
  font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--ink);
  display:block;min-height:1.6em;line-height:1.6;
}
.collapse p{
  margin-top:16px;font-size:14px;color:var(--muted);line-height:1.55;
  opacity:0;transform:translateY(6px);
  transition:opacity .6s cubic-bezier(.2,.7,.3,1),transform .6s cubic-bezier(.2,.7,.3,1);
}
.collapse p.show{opacity:1;transform:none}

.cta-row{margin-top:40px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.btn{
  font-family:"JetBrains Mono",monospace;font-size:13px;font-weight:500;
  padding:13px 22px;border-radius:8px;text-decoration:none;border:1px solid var(--pen);
  background:var(--pen);color:var(--paper);transition:.22s;display:inline-block;cursor:pointer;
}
[data-theme="dark"] .btn{color:#0E1412}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px -12px var(--pen)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--rule)}
.btn.ghost:hover{border-color:var(--pen);box-shadow:none}
.note{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--muted)}

/* ============ FACT STRIP ============ */
.facts{
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);
  display:grid;grid-template-columns:repeat(4,1fr);
}
@media(max-width:760px){.facts{grid-template-columns:repeat(2,1fr)}}
.fact{padding:26px 22px;border-right:1px solid var(--rule)}
.fact:last-child{border-right:0}
@media(max-width:760px){
  .fact:nth-child(2n){border-right:0}
  .fact:nth-child(-n+2){border-bottom:1px solid var(--rule)}
}
.fact .n{font-family:"Bricolage Grotesque",sans-serif;font-size:26px;font-weight:800;letter-spacing:-.03em;min-height:1.15em}
.fact .n .cur{display:inline-block;width:8px;height:20px;background:var(--pen);vertical-align:-2px;margin-left:2px;animation:blink .9s step-end infinite}
.fact .l{font-family:"JetBrains Mono",monospace;font-size:10.5px;color:var(--muted);margin-top:6px;line-height:1.5}

/* ============ SECTIONS ============ */
section{padding:96px 0}
.sec-head{max-width:60ch;margin-bottom:52px}
.sec-head h2{font-size:clamp(28px,3.6vw,42px);font-weight:800;margin-top:14px}
.sec-head p{color:var(--muted);margin-top:18px;font-size:18px}

.cols3{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
@media(max-width:820px){.cols3{grid-template-columns:1fr}}
.cols2{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
@media(max-width:760px){.cols2{grid-template-columns:1fr}}
.fmt-meta{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--pen)!important;margin-top:16px;padding-top:14px;border-top:1px dashed var(--rule)}
.cell{background:var(--surface);padding:32px 26px}
.cell h3{font-size:19px;font-weight:600;margin-bottom:12px}
.cell p{font-size:15.5px;color:var(--muted)}
.cell .idx{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--pen);margin-bottom:18px;display:block}

/* stages */
.stages{display:grid;gap:16px}
.stage{
  display:grid;grid-template-columns:120px 1fr 160px;gap:24px;align-items:baseline;
  padding:26px 0;border-top:1px solid var(--rule);
}
.stage:last-child{border-bottom:1px solid var(--rule)}
@media(max-width:760px){.stage{grid-template-columns:1fr;gap:10px}}
.stage .st{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--pen);letter-spacing:.1em;text-transform:uppercase}
.stage h3{font-size:22px;font-weight:600;margin-bottom:8px}
.stage p{color:var(--muted);font-size:15.5px}
.stage .meta{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--muted);text-align:right}
@media(max-width:760px){.stage .meta{text-align:left}}
.total{margin-top:26px;font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--muted)}
.total b{color:var(--ink);font-weight:500}

/* artifacts — a real sequence, so numbering earns its place */
.arts{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
@media(max-width:700px){.arts{grid-template-columns:1fr}}
.art{background:var(--surface);padding:24px 26px;display:flex;gap:18px;align-items:flex-start;transition:background .25s}
.art:hover{background:var(--pen-soft)}
.art .num{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--pen);padding-top:4px;flex:none}
.art h4{font-family:"Bricolage Grotesque",sans-serif;font-size:17px;font-weight:600;margin-bottom:5px}
.art p{font-size:14px;color:var(--muted);line-height:1.5}
.art.final{grid-column:1 / -1;background:var(--pen-soft)}
.art.final h4::after{content:" ⟵ capstone";font-family:"JetBrains Mono",monospace;font-size:10px;color:var(--marker);letter-spacing:.05em}
[data-theme="light"] .art.final h4::after{color:#B08900}
@media(max-width:700px){.art.final{grid-column:auto}}

/* papers */
.papers{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.paper{
  font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--muted);
  border:1px solid var(--rule);border-radius:99px;padding:7px 14px;background:var(--surface);transition:.2s;
}
.paper:hover{color:var(--ink);border-color:var(--pen)}

/* honest */
.honest{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
@media(max-width:760px){.honest{grid-template-columns:1fr}}
.hcol{background:var(--surface);padding:34px 30px}
.hcol h3{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.16em;text-transform:uppercase;margin-bottom:22px}
.hcol.yes h3{color:var(--pen)}
.hcol.no h3{color:var(--muted)}
.hcol ul{list-style:none}
.hcol li{padding:11px 0 11px 26px;position:relative;font-size:15.5px;border-bottom:1px dashed var(--rule)}
.hcol li:last-child{border-bottom:0}
.hcol.yes li::before{content:"✓";position:absolute;left:0;color:var(--pen);font-family:"JetBrains Mono",monospace;font-size:13px}
.hcol.no li{color:var(--muted)}
.hcol.no li::before{content:"✕";position:absolute;left:0;font-family:"JetBrains Mono",monospace;font-size:13px;opacity:.6}

/* ============ PRICE REVEAL ============ */
.vault{
  border:1px solid var(--rule);border-radius:14px;background:var(--surface);box-shadow:var(--shadow);
  overflow:hidden;position:relative;
}
.vault-lock{padding:60px 34px;text-align:center;cursor:pointer;position:relative;transition:.3s}
.vault-lock:hover{background:var(--pen-soft)}
.vault-lock:focus-visible{outline:2px solid var(--pen);outline-offset:-3px}
.redact{
  font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:clamp(34px,6vw,60px);
  letter-spacing:-.03em;color:var(--ink);filter:blur(11px);opacity:.55;user-select:none;transition:.4s;
}
.vault-lock:hover .redact{filter:blur(7px);letter-spacing:.02em}
.vault-lock .hint{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--pen);margin-top:24px}
.vault-lock .hint::after{content:" ▸";animation:nudge 1.6s ease-in-out infinite}
@keyframes nudge{0%,100%{opacity:.4}50%{opacity:1}}
.vault-open{display:none;padding:44px 38px}
.vault.open .vault-lock{display:none}
.vault.open .vault-open{display:block;animation:unfold .55s cubic-bezier(.2,.8,.25,1)}
@keyframes unfold{from{opacity:0;transform:translateY(-10px) scale(.99)}to{opacity:1;transform:none}}
.vault-open h3{font-size:26px;font-weight:800;margin-bottom:18px}
.vault-open p{color:var(--muted);max-width:60ch;margin-bottom:14px;font-size:16.5px}
.vault-open p b{color:var(--ink);font-weight:600}
.vault-terms{
  margin-top:26px;display:flex;gap:10px;flex-wrap:wrap;
}
.term{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--muted);border:1px dashed var(--rule);border-radius:6px;padding:8px 12px}
.term b{color:var(--ink);font-weight:500}

/* ============ WHO ============ */
.who{border-top:1px solid var(--rule);padding-top:48px}
.who-body h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;margin:14px 0 22px}
.who-body p{color:var(--muted);font-size:17px;margin-bottom:16px;max-width:62ch}
.who-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.lnk{
  display:inline-flex;align-items:center;gap:8px;text-decoration:none;
  font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--muted);
  border:1px solid var(--rule);border-radius:8px;padding:9px 14px;background:var(--surface);transition:.22s;
}
.lnk svg{width:14px;height:14px;fill:currentColor}
.lnk:hover{color:var(--pen);border-color:var(--pen);transform:translateY(-2px)}
.lnk-primary{color:var(--pen);border-color:var(--pen)}
.lnk-primary:hover{background:var(--pen-soft)}
/* ============ TALK ============ */
.talk{border:1px solid var(--rule);border-radius:14px;background:var(--surface);padding:44px 38px;box-shadow:var(--shadow)}
.talk h2{font-size:clamp(26px,3.4vw,38px);font-weight:800}
.talk > p{color:var(--muted);margin-top:16px;max-width:55ch}
.form{margin-top:32px;display:grid;gap:16px;max-width:560px}
label{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:8px}
input,select,textarea{
  width:100%;font-family:"Source Serif 4",serif;font-size:16px;color:var(--ink);
  background:var(--paper);border:1px solid var(--rule);border-radius:8px;padding:12px 14px;transition:.2s;
}
textarea{resize:vertical;min-height:88px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--pen);box-shadow:0 0 0 3px var(--pen-soft)}
.send{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
.form .two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:560px){.form .two{grid-template-columns:1fr}}

/* ============ FOOTER ============ */
footer{padding:44px 0 60px;border-top:1px solid var(--rule);margin-top:80px}
.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--muted)}
.foot a{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent}
.foot a:hover{color:var(--pen);border-bottom-color:var(--pen)}

/* ============ SCROLL REVEAL ============ */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.rv.in{opacity:1;transform:none}

/* ============ A11Y ============ */
a:focus-visible,button:focus-visible{outline:2px solid var(--pen);outline-offset:3px;border-radius:4px}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .rv{opacity:1;transform:none}
  .collapse p{opacity:1;transform:none}
  .arrow{opacity:1}
  h1 .w{opacity:1;transform:none}
  h1 .w.strike::after{transform:scaleX(1) rotate(-.7deg)}
  h1 .sq path{stroke-dashoffset:0}
  .mark .curve{stroke-dashoffset:0}
  .mark .ball{opacity:1;offset-distance:100%}
}