/* =========================================================================
   PreludeAI — design system  (v4 "Warm & Clean")
   Palette: warm ivory + warm neutrals + single blue accent
   Type: Spectral (serif headings) · Hanken Grotesk (sans UI/body)
   ========================================================================= */

:root{
  --bg:#faf8f3; --soft:#f3efe6; --soft-2:#ebe5d9;
  --ink:#1c1813; --body:#5b5348; --muted:#8f8578;
  --line:#e7e0d2; --line-2:#efe9dd;
  --acc:#3a54d6; --acc-ink:#2c41b4; --acc-soft:#eceffb;
  --good:#2f7d5b; --warn:#b06a1f; --bad:#b23b3b;
  --dark:#211c15;
  --ser:'Spectral',Georgia,serif;
  --ui:'Hanken Grotesk',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mw:1120px;
  --radius:16px;
  --shadow:0 1px 2px rgba(28,24,19,.05),0 16px 40px -22px rgba(28,24,19,.28);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--body);font-family:var(--ui);
  font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
img{max-width:100%}
h1,h2,h3,h4{font-family:var(--ser);font-weight:500;color:var(--ink);margin:0;letter-spacing:-.01em;line-height:1.1}
p{margin:0 0 1.05em}
.mw{max-width:var(--mw);margin:0 auto;padding:0 32px}
.eyebrow{font-family:var(--ui);font-weight:600;font-size:12.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--acc)}
.serif-em{font-style:italic;color:var(--acc)}
.center{text-align:center}
.skip{position:absolute;left:-999px}
.skip:focus{left:12px;top:12px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px;z-index:200}

/* ---- Nav ---------------------------------------------------------------- */
.nav{position:sticky;top:0;z-index:60;background:rgba(250,248,243,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{max-width:var(--mw);margin:0 auto;padding:0 32px;height:68px;display:flex;align-items:center;justify-content:space-between}
.brand{font-family:var(--ser);font-weight:600;font-size:22px;color:var(--ink);letter-spacing:-.01em}
.brand b{color:var(--acc);font-weight:600}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--body)}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-btn{background:var(--ink);color:var(--bg)!important;padding:9px 17px;border-radius:9px;font-size:14px}
.nav-btn:hover{background:#000}
.nav-tog{display:none;background:none;border:0;color:var(--ink);font-family:var(--ui);font-weight:600;font-size:14px;cursor:pointer;padding:8px}

/* ---- Buttons ------------------------------------------------------------ */
.btn{font-family:var(--ui);font-weight:600;font-size:15px;padding:13px 22px;border-radius:10px;cursor:pointer;
  transition:all .15s;display:inline-flex;align-items:center;gap:8px;border:1px solid transparent}
.btn.solid{background:var(--acc);color:#fff}
.btn.solid:hover{background:var(--acc-ink)}
.btn.ghost{color:var(--ink);border-color:var(--line);background:transparent}
.btn.ghost:hover{border-color:var(--muted);background:var(--soft)}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ---- Hero --------------------------------------------------------------- */
.hero{padding:98px 0 80px}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:64px;align-items:center}
.hero h1{font-size:clamp(42px,5.8vw,66px);font-weight:500;letter-spacing:-.018em;line-height:1.06;margin:20px 0 0}
.hero .sub{font-size:19px;color:var(--body);margin:24px 0 0;max-width:44ch}
.cta-row{display:flex;gap:12px;margin-top:32px;flex-wrap:wrap;align-items:center}

/* ---- Signal card / graphic --------------------------------------------- */
.sig-card{background:var(--soft);border:1px solid var(--line);border-radius:18px;padding:24px 26px 20px;box-shadow:var(--shadow)}
.sig-card .top{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.sig-card .t{font-size:12px;font-weight:600;color:var(--muted);letter-spacing:.05em;text-transform:uppercase}
.sig-card .badge{font-size:11px;font-weight:600;color:var(--acc);background:var(--acc-soft);padding:3px 10px;border-radius:20px}
.sig{width:100%;height:auto;display:block}
.sig .noise{fill:none;stroke:#cbc3b3;stroke-width:1.2}
.sig .nd{fill:#cbc3b3}
.sig .route{fill:none;stroke:var(--acc);stroke-width:3;stroke-linecap:round;stroke-dasharray:720;stroke-dashoffset:720}
.sig.drawn .route{transition:stroke-dashoffset 1.5s cubic-bezier(.6,.03,.2,1);stroke-dashoffset:0}
.sig .lab{font-family:var(--ui);font-size:11px;font-weight:500;fill:var(--muted)}
.sig .lab.ac{fill:var(--acc);font-weight:600}
.sig .s{fill:var(--ink)} .sig .e{fill:var(--acc)}
@media (prefers-reduced-motion:reduce){.sig .route{stroke-dashoffset:0}}

/* ---- Logo strip --------------------------------------------------------- */
.logos{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--soft)}
.logos-in{max-width:var(--mw);margin:0 auto;padding:30px 32px;text-align:center}
.logos .lab{font-size:12.5px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin-bottom:20px}
.logos .row{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:14px 34px}
.logos .item{display:inline-flex;align-items:center;gap:10px;color:var(--ink)}
.logos .item img{width:30px;height:30px;object-fit:contain;border-radius:6px;background:#fff;filter:grayscale(1);opacity:.8;transition:filter .2s,opacity .2s}
.logos .item:hover img{filter:none;opacity:1}
.logos .item span{font-weight:600;font-size:16px;letter-spacing:-.01em}

/* Proof logo wall */
.lw-mark{width:44px;height:44px;object-fit:contain;background:#fff;border-radius:8px;padding:4px;filter:grayscale(1);opacity:.9;transition:filter .2s,opacity .2s}
.lw-cell:hover .lw-mark{filter:none;opacity:1}

/* ---- Sections ----------------------------------------------------------- */
.sec{padding:90px 0;border-top:1px solid var(--line)}
.sec.alt{background:var(--soft)}
.sec-head{max-width:660px;margin:0 auto 52px;text-align:center}
.sec-head h2{font-size:clamp(30px,3.9vw,44px);font-weight:500;letter-spacing:-.018em}
.sec-head p{font-size:18px;color:var(--body);margin:16px 0 0}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.sec.alt .card{background:var(--bg)}
.card .lb{font-size:11.5px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--acc);display:block;margin-bottom:12px}
.card h3{font-family:var(--ser);font-weight:600;font-size:20px;margin:0 0 8px}
.card p{margin:0;font-size:15px;color:var(--body);line-height:1.58}
.card .nm{color:var(--ink);font-weight:600}

/* view cards (headline vs reality) */
.vcard .hd{font-family:var(--ser);font-style:italic;font-size:19px;color:var(--muted);line-height:1.42;margin:0 0 16px;padding-bottom:16px;border-bottom:1px solid var(--line-2)}

/* numbered steps */
.step .n{width:36px;height:36px;border-radius:10px;background:var(--acc-soft);color:var(--acc);font-family:var(--ser);font-weight:600;font-size:16px;display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.step .k{display:block;margin-top:14px;font-size:11px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}

/* ---- Icons -------------------------------------------------------------- */
.ico{width:24px;height:24px;display:inline-block;vertical-align:middle;flex:0 0 auto}

/* ---- Pillars (proposition) --------------------------------------------- */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.pillar{border:1px solid var(--line);border-radius:14px;padding:22px 22px 20px;background:var(--bg)}
.pillar .ic{width:42px;height:42px;border-radius:11px;background:var(--acc-soft);color:var(--acc);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.pillar .ic .ico{width:22px;height:22px}
.pillar h3{font-size:17px;font-weight:600;margin:0 0 5px}
.pillar p{margin:0;font-size:14px;color:var(--body);line-height:1.5}

/* ---- Journey diagram (what we do) -------------------------------------- */
.journey{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:8px}
.journey-line{position:absolute;top:34px;left:12%;right:12%;height:2px;background:var(--line);z-index:0}
.jstep{position:relative;z-index:1;text-align:center}
.jnode{width:68px;height:68px;border-radius:50%;background:var(--bg);border:1px solid var(--line);color:var(--acc);display:flex;align-items:center;justify-content:center;margin:0 auto 16px;position:relative;box-shadow:var(--shadow)}
.jnode .ico{width:28px;height:28px}
.jnode .jnum{position:absolute;top:-6px;right:-6px;width:22px;height:22px;border-radius:50%;background:var(--acc);color:#fff;font-weight:700;font-size:12px;display:flex;align-items:center;justify-content:center}
.jstep h3{font-family:var(--ser);font-weight:600;font-size:20px;margin:0 0 6px}
.jstep p{font-size:14.5px;color:var(--body);margin:0 auto;max-width:24ch}
.jstep .k{display:block;margin-top:10px;font-size:11px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
@media(max-width:760px){
  .journey{grid-template-columns:1fr;gap:0}
  .journey-line{left:34px;right:auto;top:40px;bottom:40px;width:2px;height:auto}
  .jstep{display:grid;grid-template-columns:68px 1fr;gap:18px;text-align:left;align-items:center;padding:14px 0}
  .jnode{margin:0}
  .jstep p{margin:0;max-width:none}
}

/* ---- About portrait ---------------------------------------------------- */
.about-intro{display:grid;grid-template-columns:260px 1fr;gap:36px;align-items:start;margin-bottom:28px}
.portrait{width:100%;max-width:260px;aspect-ratio:4/5;border-radius:16px;overflow:hidden;position:relative;border:1px solid var(--line);background:var(--soft);margin:0}
.portrait-ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--ser);font-weight:600;font-size:64px;color:var(--muted);background:var(--soft-2)}
.portrait img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.portrait figcaption{position:absolute;left:0;right:0;bottom:0;padding:30px 16px 12px;background:linear-gradient(to top,rgba(28,24,19,.78),rgba(28,24,19,0));color:#fff;font-family:var(--ser);font-weight:600;font-size:16px}
.portrait figcaption span{display:block;font-family:var(--ui);font-weight:600;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.82);margin-top:2px}
@media(max-width:640px){.about-intro{grid-template-columns:1fr;gap:22px}.portrait{max-width:200px}}

/* ---- CTA block ---------------------------------------------------------- */
.cta{padding:94px 0}
.cta-inner{max-width:var(--mw);margin:0 auto;background:var(--dark);border-radius:24px;padding:66px 56px;text-align:center;color:#faf8f3}
.cta-inner h2{color:#faf8f3;font-size:clamp(30px,4vw,46px);font-weight:500;letter-spacing:-.018em}
.cta-inner p{color:#c9c1b2;font-size:18px;margin:16px auto 30px;max-width:46ch}
.cta-inner .btn.solid{background:var(--acc)}
.cta-inner .note{margin-top:16px;font-size:13px;color:#948b7c}

/* ---- Forms -------------------------------------------------------------- */
.field{margin-bottom:20px}
.field label{display:block;font-size:12.5px;font-weight:600;letter-spacing:.03em;color:var(--ink);margin-bottom:7px}
.field input,.field textarea,.field select{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:10px;
  color:var(--ink);font-family:var(--ui);font-size:16px;padding:12px 14px;transition:border-color .15s,box-shadow .15s}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-soft)}
.field .hint{font-size:12.5px;color:var(--muted);margin-top:6px}
.field.err input,.field.err textarea{border-color:var(--bad)}
.field .msg{font-size:12.5px;color:var(--bad);margin-top:6px}
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;overflow:hidden}  /* honeypot */
.form-note{font-size:13px;color:var(--muted)}
.alert{border-radius:10px;padding:14px 16px;font-size:15px;margin-bottom:20px}
.alert.ok{background:#eaf5ef;border:1px solid #bfe0cd;color:#1f5f42}
.alert.bad{background:#fbecec;border:1px solid #edc9c9;color:#8f2d2d}

/* ---- AI feature: Signal / Noise ---------------------------------------- */
.tool{max-width:780px;margin:0 auto}
.tool-card{background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:30px;box-shadow:var(--shadow)}
.tool .examples{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 4px}
.chip{font-size:13px;color:var(--ink);background:var(--soft);border:1px solid var(--line);border-radius:20px;padding:6px 13px;cursor:pointer;transition:all .15s}
.chip:hover{border-color:var(--acc);color:var(--acc)}
.verdict{margin-top:22px;border:1px solid var(--line);border-radius:16px;overflow:hidden;opacity:0;transform:translateY(6px);transition:opacity .4s,transform .4s}
.verdict.show{opacity:1;transform:none}
.verdict .bar{display:flex;align-items:center;gap:12px;padding:16px 22px;color:#fff}
.verdict .bar .tag{font-family:var(--ser);font-weight:600;font-size:22px}
.verdict .bar .score{margin-left:auto;font-size:13px;font-weight:600;opacity:.9;font-variant-numeric:tabular-nums}
.verdict.signal .bar{background:var(--good)}
.verdict.noise .bar{background:var(--bad)}
.verdict.mixed .bar{background:var(--warn)}
.verdict .body{padding:20px 22px}
.verdict .body p{margin:0 0 12px;font-size:15.5px;color:var(--body);line-height:1.6}
.verdict .body p:last-child{margin:0}
.verdict .body .h{font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.ai-disabled{background:var(--soft);border:1px dashed var(--line);border-radius:12px;padding:16px 18px;font-size:14px;color:var(--muted)}

/* ---- Reality Check ------------------------------------------------------ */
.rc-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.rc-result{margin-top:24px}
.rc-block{border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin-bottom:14px;background:var(--bg)}
.rc-block .h{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--acc);margin:0 0 8px}
.rc-block ul{margin:0;padding-left:18px}
.rc-block li{margin:0 0 6px;font-size:15px;color:var(--body)}
.rc-verdict{font-family:var(--ser);font-size:20px;color:var(--ink);line-height:1.4;border-left:3px solid var(--acc);padding-left:16px;margin:0 0 18px}

/* Reality Check v2: score meter, sources, follow-up chat */
.rc-meter{border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin-bottom:18px;background:var(--bg)}
.rc-meter-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px}
.rc-meter-label{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.rc-meter-score{font-family:var(--ser);font-weight:600;font-size:30px;line-height:1;font-variant-numeric:tabular-nums;color:var(--muted)}
.rc-meter-track{height:10px;border-radius:6px;background:var(--soft-2);overflow:hidden}
.rc-meter-fill{height:100%;width:0;border-radius:6px;background:var(--muted);transition:width 1s cubic-bezier(.6,.03,.2,1)}
.rc-meter.low .rc-meter-fill{background:var(--bad)} .rc-meter.low .rc-meter-score{color:var(--bad)}
.rc-meter.mid .rc-meter-fill{background:var(--warn)} .rc-meter.mid .rc-meter-score{color:var(--warn)}
.rc-meter.high .rc-meter-fill{background:var(--good)} .rc-meter.high .rc-meter-score{color:var(--good)}
.rc-meter-reason{margin:10px 0 0;font-size:14.5px;color:var(--body)}
@media (prefers-reduced-motion:reduce){.rc-meter-fill{transition:none}}
.rc-sources{display:flex;flex-wrap:wrap;gap:8px}
.rc-source{display:inline-block;font-size:13.5px;font-weight:600;color:var(--acc);background:var(--acc-soft);border:1px solid #dfe4fb;border-radius:8px;padding:7px 12px}
.rc-source:hover{background:#e3e8fb}
.rc-chat{margin-top:22px;border-top:1px solid var(--line);padding-top:20px}
.rc-thread{display:flex;flex-direction:column;gap:10px;margin-bottom:12px}
.rc-bubble{max-width:85%;padding:11px 15px;border-radius:14px;font-size:15px;line-height:1.55;white-space:pre-wrap}
.rc-bubble.user{align-self:flex-end;background:var(--acc);color:#fff;border-bottom-right-radius:4px}
.rc-bubble.ai{align-self:flex-start;background:var(--soft);color:var(--ink);border:1px solid var(--line);border-bottom-left-radius:4px}
.rc-bubble.thinking{color:var(--muted);font-style:italic}
.rc-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.rc-chat-row{display:flex;gap:10px}
.rc-chat-row input{flex:1;background:var(--bg);border:1px solid var(--line);border-radius:10px;color:var(--ink);font-family:var(--ui);font-size:15px;padding:11px 14px}
.rc-chat-row input:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-soft)}
@media(max-width:560px){.rc-chat-row{flex-direction:column}}
.rc-examples{display:flex;align-items:center;gap:10px 12px;flex-wrap:wrap;margin-bottom:18px}
.rc-ex-label{font-size:13px;color:var(--muted);font-weight:600}
.rc-ex-chips{display:flex;gap:8px;flex-wrap:wrap}

/* ---- Article / prose ---------------------------------------------------- */
.article{max-width:680px;margin:0 auto}
.article .kicker{font-size:12.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--acc)}
.article h1{font-size:clamp(32px,4.4vw,50px);font-weight:500;letter-spacing:-.02em;line-height:1.08;margin:14px 0 16px}
.article .byline{font-size:14px;color:var(--muted);margin-bottom:8px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.article .byline .dot{width:3px;height:3px;border-radius:50%;background:var(--muted);display:inline-block}
.article .lede{font-family:var(--ser);font-size:21px;line-height:1.5;color:var(--ink);margin:22px 0 30px;padding-bottom:26px;border-bottom:1px solid var(--line)}
.prose{font-size:18px;line-height:1.72;color:var(--body)}
.prose h2{font-family:var(--ser);font-weight:600;font-size:26px;letter-spacing:-.01em;color:var(--ink);margin:40px 0 12px}
.prose h3{font-family:var(--ser);font-weight:600;font-size:20px;color:var(--ink);margin:28px 0 8px}
.prose p{margin:0 0 1.1em}
.prose strong{color:var(--ink);font-weight:600}
.prose ul{margin:0 0 1.2em;padding-left:22px}
.prose li{margin:0 0 .5em}
.prose blockquote{margin:26px 0;padding:4px 0 4px 22px;border-left:3px solid var(--acc);font-family:var(--ser);font-style:italic;font-size:21px;line-height:1.45;color:var(--ink)}
.prose a{color:var(--acc);font-weight:600}
.article .endcard{margin-top:44px;padding-top:28px;border-top:1px solid var(--line)}

/* ---- Footer ------------------------------------------------------------- */
footer{border-top:1px solid var(--line);padding:44px 0}
.foot{max-width:var(--mw);margin:0 auto;padding:0 32px;display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:24px}
.foot .brand{font-size:19px;display:block;margin-bottom:8px}
.foot .tag{font-size:14px;color:var(--muted);max-width:34ch}
.foot .cols{display:flex;gap:56px;flex-wrap:wrap}
.foot .col h4{font-family:var(--ui);font-size:12px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.foot .col a{display:block;font-size:14.5px;color:var(--body);margin-bottom:8px}
.foot .col a:hover{color:var(--ink)}
.foot .cop{width:100%;border-top:1px solid var(--line);margin-top:28px;padding-top:20px;font-size:13px;color:var(--muted)}

/* ---- Reveal animation --------------------------------------------------- */
.r{opacity:0;transform:translateY(8px)}
.r.in{opacity:1;transform:none;transition:opacity .6s ease,transform .6s ease}
@media (prefers-reduced-motion:reduce){.r,.r.in{opacity:1!important;transform:none!important;transition:none}}

/* ---- Responsive --------------------------------------------------------- */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .grid-2,.grid-3,.grid-4,.pillars,.rc-grid{grid-template-columns:1fr}
  .grid-4{gap:16px}
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);padding:8px 32px 18px}
  .nav-links.open a{padding:13px 0;border-bottom:1px solid var(--line-2);width:100%}
  .nav-links.open .nav-btn{margin-top:10px;text-align:center}
  .nav-tog{display:block}
}
@media(max-width:560px){
  .sec{padding:64px 0}
  .grid-4{grid-template-columns:1fr}
  .cta-inner{padding:48px 26px}
  .tool-card{padding:22px}
}