:root{
  color-scheme:dark;
  /* the Otto family (same tokens as /demo and /admin) */
  --paper:#0e1420;      /* page */
  --sheet:#151d2b;      /* raised surfaces: notebook, form */
  --sheet-2:#1b2536;    /* student bubble, inputs */
  --grid:#202a3c;       /* squared-notebook lines */
  --line:#283449;       /* rules and borders */
  --ink:#e7ecf3;        /* text */
  --ink-2:#8d9aae;      /* secondary text */
  --otto:#ffc23d;       /* Otto's yellow: mark, primary action, margin line and notes */
  --otto-ink:#1a1405;   /* text on yellow */
  --otto-wash:#2a2414;
  --err:#ff6b57;
  --display:"Fira Sans Extra Condensed", "Arial Narrow", sans-serif;
  --body:"Golos Text", system-ui, sans-serif;
  --hand:"Caveat", "Segoe Print", cursive;
  --cell:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--body);-webkit-font-smoothing:antialiased}
a{color:inherit}
:focus-visible{outline:3px solid var(--otto);outline-offset:2px;border-radius:4px}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
@media (max-width:600px){.wrap{padding:0 16px}}

/* header */
header{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(6px);border-bottom:1px solid var(--grid)}
.bar{display:flex;align-items:center;gap:16px;height:64px}
.mark{display:flex;align-items:center;gap:10px;text-decoration:none;font:700 26px/1 var(--display);letter-spacing:.01em}
.mark i{width:30px;height:30px;border-radius:50%;background:var(--otto);display:grid;place-items:center;font-style:normal;font:700 18px/1 var(--display);color:var(--otto-ink)}
.bar nav{margin-left:auto;display:flex;align-items:center;gap:8px}
.lang{display:flex;border:1px solid var(--line);border-radius:999px;padding:2px;background:var(--sheet)}
.lang button{border:0;background:none;font:600 13px/1 var(--body);color:var(--ink-2);padding:7px 10px;border-radius:999px;cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--otto);color:var(--otto-ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;cursor:pointer;text-decoration:none;font:600 16px/1 var(--body);padding:15px 22px;border-radius:10px;background:var(--otto);color:var(--otto-ink)}
.btn:hover{background:#ffd27a}
.btn.small{padding:10px 14px;font-size:14px}
@media (max-width:520px){.bar .btn.small{display:none}}

/* hero */
.hero{padding-top:56px;padding-bottom:72px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:56px;align-items:start}
@media (max-width:920px){.hero{grid-template-columns:1fr;gap:36px;padding-top:36px;padding-bottom:56px}}
h1{font:700 clamp(44px,6.2vw,76px)/1 var(--display);letter-spacing:-.005em;margin:0 0 22px;max-width:13ch}
.lede{font-size:19px;line-height:1.55;color:var(--ink-2);max-width:34em;margin:0 0 30px}
.beta-note{margin:18px 0 0;font-size:14px;color:var(--ink-2)}

/* the notebook: the one bold thing on the page */
.notebook{margin:0;position:relative;background:
   linear-gradient(var(--grid) 1px,transparent 1px) 0 0/var(--cell) var(--cell),
   linear-gradient(90deg,var(--grid) 1px,transparent 1px) 0 0/var(--cell) var(--cell),
   var(--sheet);
  border-radius:6px 14px 14px 6px;box-shadow:0 0 0 1px var(--line),0 24px 60px -30px rgba(0,0,0,.8);
  padding:28px 22px 28px 128px;min-height:520px}
.notebook::before{content:"";position:absolute;top:0;bottom:0;left:110px;width:2px;background:var(--otto);opacity:.7}
.notebook .holes{position:absolute;left:18px;top:40px;bottom:40px;display:flex;flex-direction:column;justify-content:space-between}
.notebook .holes span{width:14px;height:14px;border-radius:50%;background:var(--paper);box-shadow:inset 0 1px 2px rgba(0,0,0,.6)}
.nb-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:18px;gap:12px}
.nb-head b{font:700 22px/1.2 var(--display);letter-spacing:.01em}
.nb-head small{color:var(--ink-2);font-size:13px}
.turn{position:relative;margin:0 0 16px;max-width:30em}
.turn .who{display:block;font:600 12px/1 var(--body);color:var(--ink-2);margin-bottom:6px}
.turn p{margin:0;padding:12px 14px;border-radius:12px;font-size:16px;line-height:1.5}
.turn.s p{background:var(--sheet-2);border-top-left-radius:4px}
.turn.o p{background:var(--otto-wash);border:1px solid #3b3017;border-top-left-radius:4px}
.turn.o .who::before{content:"";display:inline-block;width:10px;height:10px;border-radius:50%;background:var(--otto);margin-right:6px;vertical-align:-1px}
.src{display:inline-block;margin-top:8px;font-size:13px;color:var(--ink-2);border-bottom:1px dashed var(--line)}
.ai{display:block;margin-top:6px;font-size:12px;color:var(--ink-2)}
/* margin notes in red pen, sitting in the margin left of the red line */
.note{position:absolute;left:-112px;width:96px;top:22px;font:700 19px/1.05 var(--hand);color:var(--otto);transform:rotate(-4deg);text-align:right}
@media (max-width:600px){
  .notebook{padding:22px 14px 22px 18px;min-height:0}
  .notebook::before,.notebook .holes{display:none}
  .note{position:static;display:block;width:auto;text-align:left;transform:none;margin-bottom:4px;font-size:18px}
}
/* one orchestrated reveal: the conversation writes itself once */
.js .turn{opacity:0;transform:translateY(6px)}
.js .turn.on{opacity:1;transform:none;transition:opacity .45s ease,transform .45s ease}
@media (prefers-reduced-motion:reduce){.js .turn{opacity:1;transform:none}}
.replay{margin-top:4px;border:0;background:none;font:600 13px/1 var(--body);color:var(--ink-2);cursor:pointer;padding:6px 0;text-decoration:underline;text-underline-offset:3px}

/* sections */
section{padding:72px 0;border-top:1px solid var(--grid)}
@media (max-width:600px){section{padding:52px 0}}
h2{font:700 clamp(32px,4vw,48px)/1.05 var(--display);letter-spacing:0;margin:0 0 14px;max-width:20ch}
.intro{color:var(--ink-2);max-width:36em;margin:0 0 40px;font-size:18px}

/* benefits: ruled notebook lines, not cards */
.ruled{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.ruled li{display:grid;grid-template-columns:minmax(0,18em) minmax(0,1fr);gap:8px 40px;padding:22px 0;border-bottom:1px solid var(--line)}
@media (max-width:760px){.ruled li{grid-template-columns:1fr}}
.ruled h3{font:600 24px/1.2 var(--display);margin:0;letter-spacing:.01em}
.ruled p{margin:0;color:var(--ink-2);max-width:40em}

/* audiences */
.who3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px}
@media (max-width:860px){.who3{grid-template-columns:1fr;gap:28px}}
.who3 h3{font:600 24px/1.2 var(--display);margin:0 0 8px;letter-spacing:.01em}
.who3 p{margin:0;color:var(--ink-2)}
.who3 > div{padding-top:16px;border-top:3px solid var(--otto)}

/* steps: a real sequence, so numbered */
.steps{counter-reset:s;list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}
.steps li{counter-increment:s}
.steps li::before{content:counter(s);display:grid;place-items:center;width:40px;height:40px;border-radius:50%;border:2px solid var(--otto);color:var(--otto);font:700 20px/1 var(--display);margin-bottom:14px}
.steps h3{font:600 22px/1.2 var(--display);margin:0 0 6px;letter-spacing:.01em}
.steps p{margin:0;color:var(--ink-2);font-size:16px}

/* beta form */
.beta{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:56px;align-items:start}
@media (max-width:920px){.beta{grid-template-columns:1fr;gap:28px}}
form{background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:28px}
@media (max-width:600px){form{padding:20px}}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:600px){.row{grid-template-columns:1fr}}
label{display:block;font:600 14px/1.3 var(--body);margin:0 0 6px}
.field{margin-bottom:16px}
input,select,textarea{width:100%;font:400 16px/1.4 var(--body);color:var(--ink);background:var(--sheet-2);border:1px solid var(--line);border-radius:8px;padding:12px}
textarea{min-height:96px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--otto);outline-offset:0}
input::placeholder,textarea::placeholder{color:#5d6a7e}
.check input{accent-color:var(--otto)}
.hint{font-size:13px;color:var(--ink-2);margin-top:4px}
.check{display:flex;gap:10px;align-items:flex-start;font:400 14px/1.45 var(--body);color:var(--ink-2);margin:4px 0 20px}
.check input{width:18px;height:18px;margin-top:2px;flex:none}
.err{color:var(--err);font-size:14px;margin:0 0 12px;min-height:1px}
.hp{position:absolute;left:-9999px}
.done{display:none;text-align:left}
.done h3{font:700 32px/1.1 var(--display);margin:0 0 8px}
.done p{color:var(--ink-2);margin:0}
.sent form .fields{display:none}
.sent .done{display:block}

footer{border-top:1px solid var(--grid);padding:32px 0 48px;color:var(--ink-2);font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between}
footer p{margin:0;max-width:44em}

/* privacy page: both languages in the document, one shown */
.l-en{display:none}
body[data-lang="en"] .l-en{display:revert}
body[data-lang="en"] .l-bg{display:none}
.legal{max-width:760px;padding-top:40px;padding-bottom:72px}
.legal h1{max-width:none;font-size:clamp(38px,5vw,56px);margin-bottom:6px}
.legal h2{font-size:24px;margin:40px 0 10px;padding-top:24px;border-top:1px solid var(--grid);max-width:none}
.legal .updated{color:var(--ink-2);font-size:14px;margin:0 0 20px}
.legal .lead{font-size:19px;color:var(--ink-2)}
.legal p,.legal li{max-width:40em}
.legal li{margin-bottom:8px}
.scroll{overflow-x:auto}
.legal table{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
.legal th,.legal td{text-align:left;vertical-align:top;padding:10px 8px;border-bottom:1px solid var(--line)}
.legal th{font-weight:600;color:var(--ink-2)}
footer a{color:var(--ink)}
a{text-decoration-color:color-mix(in srgb,var(--otto) 70%,transparent);text-underline-offset:3px}

/* cookie consent */
.cc{position:fixed;left:0;right:0;bottom:0;z-index:20;padding:0 max(16px,env(safe-area-inset-right,0px)) calc(16px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}
.cc-box{max-width:760px;margin:0 auto;background:var(--sheet);border:1px solid var(--line);border-left:4px solid var(--otto);border-radius:12px;padding:20px;display:grid;gap:14px;box-shadow:0 16px 48px #0009}
.cc-box h2{margin:0;font:700 22px/1.1 var(--display)}
.cc-box p{margin:0;font-size:15px;color:var(--ink-2)}
.cc-box p a{color:var(--ink)}
.cc-actions{display:flex;flex-wrap:wrap;gap:10px}
.btn.ghost{background:none;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{background:var(--sheet-2)}
.cc-prefs{display:grid;gap:10px;border-top:1px solid var(--line);padding-top:14px}
.cc-opt{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:var(--ink-2)}
.cc-opt input{margin-top:5px;accent-color:var(--otto);width:16px;height:16px}
.cc-opt b{color:var(--ink)}
.linkish{background:none;border:0;padding:0;font:inherit;color:var(--ink);text-decoration:underline;cursor:pointer}