:root{
  --dark:#141518;
  --light:#f6f5f2;
  --ink:#1c1d21;
  --mute:#6b6e76;
  --line:#e4e3de;
  --accent:#2f6fed;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI","PingFang SC","Noto Sans SC",sans-serif;
  background:var(--light);
  color:var(--ink);
  line-height:1.55;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
nav{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 6vw;background:#fff;border-bottom:1px solid var(--line);
}
.logo{font-weight:700;letter-spacing:.04em}
.menu{display:flex;gap:22px;font-size:14px;color:var(--mute)}
.menu a:hover{color:var(--ink)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:36px;padding:0 14px;background:var(--dark);color:#fff;font-size:13px;font-weight:600;
}
.split-hero{
  display:grid;
  grid-template-columns:1fr 56px 1fr;
  grid-template-rows:auto auto auto;
  min-height:78vh;
}
.split-hero.compact{min-height:auto}
.left,.right{padding:48px 7vw 32px;display:flex;flex-direction:column;justify-content:center}
.left{background:var(--dark);color:#f3f3f3;grid-column:1;grid-row:1}
.right{background:var(--light);grid-column:3;grid-row:1}
.mid{
  grid-column:2;grid-row:1 / span 2;
  background:#fff;border-left:1px solid #d0d0d0;border-right:1px solid #d0d0d0;
  display:flex;align-items:center;justify-content:center;
  writing-mode:vertical-rl;letter-spacing:.35em;font-weight:700;font-size:13px;
}
.label{font-size:clamp(22px,3vw,34px);font-weight:700;margin-bottom:16px}
.sample{max-width:28ch;opacity:.85}
.hero-copy{
  grid-column:1 / -1;grid-row:2;
  padding:28px 7vw 16px;background:#fff;border-top:1px solid var(--line);
}
h1{font-size:clamp(22px,2.8vw,32px);font-weight:700}
.sub{margin-top:8px;color:var(--mute);max-width:48ch}
.line{margin-top:10px}
.bar{
  grid-column:1 / -1;grid-row:3;
  display:flex;align-items:center;justify-content:center;
  min-height:56px;background:var(--accent);color:#fff;font-weight:700;letter-spacing:.12em;
}
.bar.slim{display:inline-flex;min-height:44px;padding:0 24px;margin-top:16px;width:auto}
.bar:hover{filter:brightness(1.05)}
section{padding:56px 7vw}
section>p{margin:8px 0 24px;color:var(--mute);max-width:56ch}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.cards article{background:#fff;border:1px solid var(--line);padding:18px}
.cards h3{font-size:15px;margin-bottom:8px}
.cards p{color:var(--mute);font-size:14px}
.cards b{display:block;margin-top:12px}
.cards small{color:var(--mute)}
.three{grid-template-columns:repeat(3,1fr)}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.pair img,.docs img,.wide{width:100%;height:280px;object-fit:cover;filter:grayscale(.2)}
.wide{height:220px;padding:0 7vw 40px;display:block}
.pair ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0 20px}
.pair li{border-bottom:1px solid var(--line);padding:8px 0;font-size:14px}
details{border-bottom:1px solid var(--line);padding:12px 0}
summary{cursor:pointer;font-weight:600}
details p{margin-top:8px;max-width:70ch;color:var(--mute)}
.ghost{display:inline-block;margin-top:12px;color:var(--accent);font-size:13px}
.page{padding:48px 7vw 16px}
.help{display:grid;grid-template-columns:200px 1fr;gap:28px}
.help aside{display:flex;flex-direction:column;gap:8px;position:sticky;top:64px;align-self:start}
.help aside a{color:var(--mute);font-size:14px}
.help aside a:hover{color:var(--ink)}
.docs article{margin-bottom:32px}
.docs img{max-width:460px;height:210px;margin:14px 0}
.policy{margin-top:12px;padding:14px;background:#fff;border:1px solid var(--line)}
footer{padding:36px 7vw 20px;background:#fff;border-top:1px solid var(--line)}
.cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:18px}
.cols h4{font-size:13px;margin-bottom:8px}
.cols a,.cols p{display:block;margin:6px 0;color:var(--mute);font-size:13px}
.copy{margin-top:18px;font-size:12px;color:var(--mute)}
@media (max-width:980px){
  .menu{display:none}
  .split-hero{grid-template-columns:1fr;grid-template-rows:auto}
  .left,.right,.mid,.hero-copy,.bar{grid-column:1}
  .mid{writing-mode:horizontal-tb;letter-spacing:.2em;padding:10px 0;border:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  .cards,.three,.pair,.help,.cols{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}