/* PE Parts Hub — "quiet premium" editorial. Light only, no dark mode.
   Ink on warm white · one scarce accent (PE brand blue #1f4e9e) · Inter + one
   Cormorant-italic headline phrase · hairlines + whitespace · fade-up. */
:root{
  --ink:#0A0A0A; --ink-soft:#1A1A1A; --ink-mute:#555555; --ink-faint:#8A8A8A;
  --paper:#ffffff; --paper-warm:#FAFAF7; --paper-line:#ECECEC;
  --accent:#1f4e9e; --accent-dark:#193E7E; --accent-glow:#2f88c0; --accent-wash:#EEF5FB;
  --shell:1200px; --radius:1rem; --radius-lg:1.5rem;
  --sans:"Inter",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --serif:"Cormorant Garamond",Georgia,serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
  min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-dark)}
em{font-family:var(--serif);font-style:italic;font-weight:500;color:var(--accent);
  letter-spacing:0}
.wrap{max-width:var(--shell);margin:0 auto;padding-left:clamp(20px,5vw,40px);
  padding-right:clamp(20px,5vw,40px)}

.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-faint);font-weight:500;margin-bottom:18px}
h1,h2,h3{font-weight:500;letter-spacing:-.02em;color:var(--ink)}
h2{font-size:clamp(1.5rem,2.5vw,2.25rem);line-height:1.15;max-width:20ch}
.dek{font-size:clamp(1.05rem,1.4vw,1.3rem);line-height:1.5;color:var(--ink-mute);
  max-width:60ch;letter-spacing:-.01em}

/* header */
.top{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;
  align-items:center;padding:16px clamp(20px,5vw,40px);
  background:rgba(255,255,255,.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--paper-line)}
.brand{display:flex;gap:12px;align-items:center;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand-mark{position:relative;width:36px;height:36px;border-radius:9px;
  background:var(--accent);display:grid;place-items:center;overflow:hidden}
.brand-mark svg{width:32px;height:32px;display:block}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text b{font-weight:600;font-size:15px}
.brand-text small{color:var(--ink-faint);font-size:12px}
nav{display:flex;gap:8px}
.ghost{background:none;border:1px solid var(--paper-line);color:var(--ink);
  font-family:var(--sans);font-size:14px;padding:8px 16px;border-radius:.7rem;
  cursor:pointer;transition:background .15s,border-color .15s}
.ghost:hover{background:var(--paper-warm);border-color:#dcdcdc;color:var(--ink)}

/* hero */
.hero{max-width:var(--shell);margin:0 auto;text-align:center;
  padding:clamp(56px,11vh,120px) clamp(20px,5vw,40px) clamp(40px,7vh,72px)}
.hero .eyebrow{margin-bottom:22px}
h1{font-size:clamp(2.4rem,5.5vw,4.6rem);line-height:1.03;letter-spacing:-.03em}
h1 em{font-size:1.02em}
.hero .dek{margin:22px auto 34px;text-align:center}
.askbar{display:flex;gap:8px;max-width:660px;margin:0 auto;background:var(--paper);
  border:1px solid var(--paper-line);border-radius:var(--radius);padding:7px;
  box-shadow:0 1px 2px rgba(10,10,10,.03),0 8px 30px rgba(10,10,10,.05);
  transition:border-color .15s,box-shadow .15s}
.askbar:focus-within{border-color:var(--accent-glow);
  box-shadow:0 0 0 3px var(--accent-wash)}
.askbar input{flex:1;background:none;border:0;outline:0;color:var(--ink);
  font-family:var(--sans);font-size:16px;padding:12px 14px}
.askbar input::placeholder{color:#aaa}
.askbar button{background:var(--accent);color:#fff;font-family:var(--sans);
  font-weight:500;border:0;padding:12px 28px;border-radius:.75rem;font-size:15px;
  cursor:pointer;transition:background .15s}
.askbar button:hover{background:var(--accent-dark)}

/* stat bar — hairline-divided grid */
.statbar{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  max-width:760px;margin:44px auto 0;background:var(--paper-line);
  border:1px solid var(--paper-line);border-radius:var(--radius);overflow:hidden}
.statbar div{background:var(--paper);padding:22px 16px;text-align:center}
.statbar b{display:block;font-size:clamp(1.4rem,2.4vw,2rem);font-weight:500;
  letter-spacing:-.02em}
.statbar span{color:var(--ink-faint);font-size:12.5px;letter-spacing:.02em}

/* alternating band */
.band{background:var(--paper-warm);border-top:1px solid var(--paper-line);
  border-bottom:1px solid var(--paper-line)}
section.band>.wrap,section.wrap{padding-top:clamp(4rem,9vw,7rem);
  padding-bottom:clamp(4rem,9vw,7rem)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:1px;margin-top:40px;background:var(--paper-line);
  border:1px solid var(--paper-line);border-radius:var(--radius);overflow:hidden}
.step{background:var(--paper-warm);padding:32px 28px}
.step .num{font-family:var(--serif);font-style:italic;font-size:26px;
  color:var(--accent)}
.step h3{font-size:19px;margin:6px 0 10px}
.step p{color:var(--ink-mute);font-size:14.5px;max-width:38ch}

/* brand grid */
.brandgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(168px,1fr));
  gap:1px;margin-top:40px;background:var(--paper-line);
  border:1px solid var(--paper-line);border-radius:var(--radius);overflow:hidden}
.btile{background:var(--paper);padding:22px 18px;text-align:left;cursor:pointer;
  transition:background .15s}
.btile:hover{background:var(--accent-wash)}
.btile b{display:block;font-size:15px;font-weight:600;letter-spacing:-.01em}
.btile span{color:var(--ink-faint);font-size:12.5px}

/* trust */
.trust{max-width:760px}
.trust h2{max-width:none}
.trust .dek{margin-top:16px}

/* ===== CHAT ===== */
#chatView{max-width:940px;width:100%;margin:0 auto;
  padding:32px clamp(16px,4vw,28px) 150px}
#thread{display:flex;flex-direction:column;gap:14px;margin-bottom:24px}
.msg{max-width:78%;padding:13px 18px;font-size:15px;line-height:1.55}
.msg.user{align-self:flex-end;background:var(--ink);color:#fff;
  border-radius:1rem 1rem .25rem 1rem}
.msg.bot{align-self:flex-start;background:var(--paper-warm);
  border:1px solid var(--paper-line);border-radius:1rem 1rem 1rem .25rem;
  color:var(--ink-soft)}
.msg.bot b{font-weight:600}
.msg.bot ul{margin:8px 0 0 18px}
.msg.bot p+p{margin-top:8px}
.msg.thinking{align-self:flex-start;color:var(--ink-faint);font-style:italic;
  background:none;border:0;padding-left:2px}

/* tiles */
#tilesWrap{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:14px}
.tile{background:var(--paper);border:1px solid var(--paper-line);
  border-radius:var(--radius);padding:15px;display:flex;flex-direction:column;
  gap:9px;position:relative;transition:border-color .15s,box-shadow .15s}
.tile:hover{box-shadow:0 6px 24px rgba(10,10,10,.06)}
.tile.rec{border-color:var(--accent-glow)}
.tile .badge{position:absolute;top:11px;right:11px;background:var(--accent);
  color:#fff;font-size:10px;font-weight:600;letter-spacing:.04em;
  padding:3px 9px;border-radius:20px}
.tile img{width:100%;height:130px;object-fit:contain;background:#fff;
  border:1px solid var(--paper-line);border-radius:.6rem}
.tile .noimg{width:100%;height:130px;border-radius:.6rem;background:var(--paper-warm);
  border:1px solid var(--paper-line);display:grid;place-items:center;
  color:#bbb;font-size:12px}
.tile .tb{color:var(--ink-faint);font-size:11px;letter-spacing:.08em;
  text-transform:uppercase}
.tile .tt{font-size:13.5px;line-height:1.4;color:var(--ink-soft);min-height:38px}
.tile .tp{font-size:17px;font-weight:600;letter-spacing:-.01em}
.tile .tp.q{color:var(--accent);font-family:var(--serif);font-style:italic;
  font-size:17px;font-weight:500}
.tile .tact{display:flex;gap:8px;margin-top:auto}
.tile .tact a,.tile .tact label{flex:1;text-align:center;
  border:1px solid var(--paper-line);border-radius:.6rem;padding:8px 0;
  font-size:13px;color:var(--ink);cursor:pointer;transition:border-color .15s,background .15s}
.tile .tact a:hover,.tile .tact label:hover{border-color:var(--accent-glow);
  background:var(--accent-wash);color:var(--ink)}
.tile .tact label{display:flex;gap:6px;align-items:center;justify-content:center}
.tile input[type=checkbox]{accent-color:var(--accent)}

/* fixed chat askbar */
.chat-askbar{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);
  width:min(900px,calc(100% - 32px));z-index:15;
  box-shadow:0 8px 30px rgba(10,10,10,.1)}

/* rfq bar — [hidden] must win over display:flex */
#rfqBar[hidden]{display:none}
#rfqBar{position:fixed;bottom:90px;left:50%;transform:translateX(-50%);
  background:var(--ink);color:#fff;border-radius:40px;display:flex;gap:14px;
  align-items:center;padding:9px 10px 9px 22px;z-index:16;
  box-shadow:0 10px 30px rgba(10,10,10,.25)}
#rfqBar span{font-size:14px}
#rfqBar button{background:var(--accent);border:0;border-radius:24px;color:#fff;
  font-family:var(--sans);font-weight:500;padding:9px 20px;cursor:pointer;
  transition:background .15s}
#rfqBar button:hover{background:var(--accent-dark)}

/* modal */
dialog{background:var(--paper);color:var(--ink);border:1px solid var(--paper-line);
  border-radius:var(--radius-lg);padding:30px;width:min(480px,92vw);
  box-shadow:0 30px 80px rgba(10,10,10,.25)}
dialog::backdrop{background:rgba(10,10,10,.4);backdrop-filter:blur(2px)}
dialog h3{font-size:22px;margin-bottom:16px}
#rfqList{list-style:none;margin-bottom:16px;font-size:13.5px;color:var(--ink-mute);
  max-height:130px;overflow:auto}
#rfqList li{padding:6px 0;border-bottom:1px solid var(--paper-line)}
dialog label{display:block;font-size:12px;letter-spacing:.02em;color:var(--ink-faint);
  text-transform:uppercase;margin-bottom:12px}
dialog input,dialog textarea{width:100%;background:var(--paper);
  border:1px solid var(--paper-line);border-radius:.6rem;color:var(--ink);
  font-family:var(--sans);font-size:14px;padding:10px 12px;margin-top:5px;
  text-transform:none;letter-spacing:0}
dialog input:focus,dialog textarea:focus{outline:0;border-color:var(--accent-glow);
  box-shadow:0 0 0 3px var(--accent-wash)}
.row2{display:flex;gap:10px}
.row2 label{flex:1}
.row2 button{flex:1;padding:12px;border-radius:.7rem;font-size:14px;cursor:pointer}
#rfqSubmit{background:var(--accent);border:0;color:#fff;font-family:var(--sans);
  font-weight:500}
#rfqSubmit:hover{background:var(--accent-dark)}
#rfqStatus{font-size:13.5px;margin-top:12px}
#rfqStatus.ok{color:#1f8a4c}
#rfqStatus.err{color:#c0392b}

footer{border-top:1px solid var(--paper-line);background:var(--paper-warm);
  padding:24px clamp(20px,5vw,40px);display:flex;gap:22px;flex-wrap:wrap;
  color:var(--ink-faint);font-size:13.5px}
footer a{color:var(--ink-mute)}
footer a:hover{color:var(--accent)}

/* motion — fade-up on scroll, once */
.reveal{opacity:0;transform:translateY(12px);
  transition:opacity .7s cubic-bezier(.22,1,.36,1),transform .7s cubic-bezier(.22,1,.36,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}
@media (max-width:640px){
  .statbar{grid-template-columns:repeat(2,1fr)}
  .msg{max-width:92%}
}