/* ProtoBridge — shared stylesheet
   Design system: light, engineer-to-engineer, numbers over adjectives.
   No external fonts, no CDN, no JS. */

:root{
  --ink:#0f1e28;
  --muted:#5b6b76;
  --line:#e2e8ec;
  --bg:#ffffff;
  --soft:#f6f8f9;
  --accent:#c5002e;
  --ph-bg:#fdf6df;
  --ph-line:#d9b64a;
  --ph-ink:#7a5c00;
}

*{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;
  -webkit-font-smoothing:antialiased;
}

.wrap{max-width:1080px;margin:0 auto;padding:0 28px}

a{color:inherit;text-decoration:none}

img{display:block;max-width:100%;height:auto}

/* ---------- header ---------- */

header{
  border-bottom:1px solid var(--line);
  position:sticky;top:0;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(8px);
  z-index:20;
}

.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:24px}

.brand{font-weight:700;letter-spacing:-.02em;font-size:18px;white-space:nowrap}
.brand span{color:var(--accent)}

.nav nav{display:flex;gap:22px;font-size:13.5px;color:var(--muted);
  overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;white-space:nowrap}
.nav nav::-webkit-scrollbar{display:none}
.nav nav a{padding:4px 0;border-bottom:1px solid transparent}
.nav nav a:hover{color:var(--ink);border-color:var(--line)}
.nav nav a[aria-current="page"]{color:var(--ink);font-weight:600;border-color:var(--accent)}

.btn{
  display:inline-block;background:var(--ink);color:#fff;
  padding:11px 20px;border-radius:6px;font-size:14px;font-weight:600;
  letter-spacing:.01em;white-space:nowrap;border:1px solid var(--ink);
}
.btn:hover{background:#1b2f3c;border-color:#1b2f3c}
.btn.ghost-btn{background:transparent;color:var(--ink)}
.btn.ghost-btn:hover{background:var(--soft)}

.ghost{font-size:14px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:2px}
.ghost:hover{color:var(--ink);border-color:var(--ink)}

@media(max-width:900px){
  .nav{height:auto;padding:12px 0;flex-wrap:wrap;row-gap:10px}
  .nav nav{order:3;width:100%;gap:18px;font-size:13px}
  .btn{padding:9px 16px;font-size:13px}
}

/* ---------- page hero ---------- */

.hero{padding:80px 0 64px;border-bottom:1px solid var(--line)}

.page-hero{padding:56px 0 44px;border-bottom:1px solid var(--line)}

.crumb{font-size:13px;color:var(--muted);margin-bottom:22px;display:inline-block}
.crumb:hover{color:var(--ink)}

.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:18px}

h1{font-size:clamp(32px,5vw,54px);line-height:1.1;letter-spacing:-.03em;margin:0 0 20px;font-weight:700;max-width:18em}
h1 em{font-style:normal;color:var(--accent)}

h1.page{font-size:clamp(28px,4vw,42px);letter-spacing:-.028em;max-width:20em}

.lede{font-size:18px;color:var(--muted);max-width:44em;margin:0 0 30px}

.hero-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}

.hero-media{margin:44px 0 0}
.hero-media img{width:100%;border-radius:10px;border:1px solid var(--line)}

/* ---------- stats ---------- */

.stats{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line)}
.stat{padding:26px 24px;border-right:1px solid var(--line)}
.stat:last-child{border-right:none}
.stat b{display:block;font-size:26px;letter-spacing:-.02em;margin-bottom:4px}
.stat small{color:var(--muted);font-size:13px}

@media(max-width:820px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2){border-right:none}
  .stat:nth-child(-n+2){border-bottom:1px solid var(--line)}
}

/* ---------- sections ---------- */

section{padding:68px 0;border-bottom:1px solid var(--line)}
section.tight{padding:52px 0}
section:last-of-type{border-bottom:none}

h2{font-size:clamp(24px,3.4vw,34px);letter-spacing:-.025em;margin:0 0 12px;font-weight:700}
h3{font-size:18px;margin:0 0 10px;letter-spacing:-.01em}

.sub{color:var(--muted);max-width:42em;margin:0 0 40px}

p{margin:0 0 16px}
.prose{max-width:44em;color:#243642}
.prose p{color:var(--muted);font-size:16px}
.prose strong{color:var(--ink);font-weight:600}

/* ---------- grids ---------- */

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.walls{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.wall{background:#fff;padding:30px 26px}
.wall .n{font-size:12px;letter-spacing:.12em;color:var(--accent);margin-bottom:14px;font-weight:600}
.wall p{margin:0;font-size:14.5px;color:var(--muted)}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{border:1px solid var(--line);border-radius:10px;padding:0 0 24px;background:#fff;overflow:hidden}
.card .thumb{aspect-ratio:4/3;overflow:hidden;background:var(--soft);border-bottom:1px solid var(--line)}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .body{padding:22px 24px 0}
.card .tag{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.card p{margin:0 0 14px;font-size:14.5px;color:var(--muted)}
.card code{font-size:12.5px;background:var(--soft);padding:4px 8px;border-radius:4px;color:#33454f}

@media(max-width:900px){
  .grid2,.grid3,.cards,.walls{grid-template-columns:1fr}
  .grid2{gap:32px}
}

/* ---------- panels / steps ---------- */

.panel{border:1px solid var(--line);border-radius:10px;padding:28px 26px;background:#fff}
.panel .tag{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}

.steps{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.step{background:#fff;padding:26px 28px;display:grid;grid-template-columns:64px 1fr;gap:20px;align-items:start}
.step .num{font-size:13px;font-weight:700;letter-spacing:.1em;color:var(--accent);padding-top:3px}
.step h3{margin:0 0 6px}
.step p{margin:0;color:var(--muted);font-size:15px}

@media(max-width:640px){
  .step{grid-template-columns:1fr;gap:6px}
  .step .num{padding-top:0}
}

/* ---------- spec list ---------- */

.spec{margin:0;border-top:1px solid var(--line)}
.spec div{display:grid;grid-template-columns:34% 1fr;gap:20px;padding:15px 0;border-bottom:1px solid var(--line)}
.spec dt{font-weight:600;font-size:15px;margin:0}
.spec dd{margin:0;color:var(--muted);font-size:15px}

@media(max-width:640px){
  .spec div{grid-template-columns:1fr;gap:4px}
}

/* stacked variant: for spec lists inside narrow panels */
.spec.stacked div{grid-template-columns:1fr;gap:2px;padding:12px 0}
.spec.stacked dt{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.spec.stacked dd{font-size:14.5px}

/* ---------- table ---------- */

.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
td:first-child{font-weight:600;width:30%}

/* ---------- notes ---------- */

.no{background:var(--soft);border-left:3px solid var(--accent);padding:24px 26px;border-radius:0 8px 8px 0}
.no ul{margin:0;padding-left:20px;color:var(--muted);font-size:15px}
.no li{margin-bottom:8px}
.no li:last-child{margin-bottom:0}

.note{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:22px 24px;font-size:15px;color:var(--muted)}
.note strong{color:var(--ink)}
.note.warn{background:#fff8f0;border-color:#f0d9c0}

/* ---------- figures ---------- */

figure{margin:0}
figure img{width:100%;border-radius:10px;border:1px solid var(--line)}
figcaption{font-size:12.5px;color:var(--muted);margin-top:10px;line-height:1.5}

/* ---------- placeholder block (things only the owner can fill) ---------- */

.ph{
  display:inline-block;
  background:var(--ph-bg);
  border:1px dashed var(--ph-line);
  color:var(--ph-ink);
  padding:1px 7px;
  border-radius:4px;
  font-size:.92em;
  font-weight:500;
  white-space:normal;
}

.ph-block{
  display:block;
  background:var(--ph-bg);
  border:1px dashed var(--ph-line);
  color:var(--ph-ink);
  padding:18px 20px;
  border-radius:8px;
  font-size:14px;
}

/* ---------- address card ---------- */

.address{
  border:1px solid var(--ink);
  border-radius:10px;
  padding:26px 28px;
  font-size:15px;
  line-height:1.8;
  background:#fff;
}
.address .label{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}

/* ---------- cta + footer ---------- */

.cta{text-align:center;padding:76px 0}
.cta p{color:var(--muted);margin:0 auto 26px;max-width:38em}

.riskline{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:22px 0;
  font-size:15px;
  color:var(--muted);
  text-align:center;
}
.riskline strong{color:var(--ink);font-weight:600}

footer{padding:40px 0 48px;font-size:13.5px;color:var(--muted)}
.foot{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;padding-bottom:26px;border-bottom:1px solid var(--line)}
.foot a:hover{color:var(--ink)}

.contact-block{padding:26px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}
.contact-block .row{display:flex;gap:10px;flex-wrap:wrap;align-items:baseline}
.contact-block .row span.sep{color:var(--line)}
.contact-block .promise{margin-top:8px;color:var(--ink);font-weight:600;font-size:13.5px}
.contact-block a:hover{color:var(--ink)}

.legal{padding-top:26px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12.5px}
.legal a:hover{color:var(--ink)}

details.disclosure{border:1px solid var(--line);border-radius:8px;padding:0;margin-top:14px;background:#fff}
details.disclosure summary{cursor:pointer;padding:16px 20px;font-size:14px;font-weight:600;list-style:none}
details.disclosure summary::-webkit-details-marker{display:none}
details.disclosure summary::after{content:"+";float:right;color:var(--muted);font-weight:400}
details.disclosure[open] summary::after{content:"\2212"}
details.disclosure .inner{padding:0 20px 20px;font-size:14.5px;color:var(--muted)}
details.disclosure .inner p:last-child{margin-bottom:0}

/* ---------- print (for the ship-to card) ---------- */

@media print{
  header,footer,.cta,.crumb,.hero-row,.riskline{display:none!important}
  body{font-size:12pt}
  .address{border:2px solid #000}
  section{padding:20px 0;border:none}
  a[href]::after{content:""}
}