:root{
  --paper:#F3F1EC;
  --sheet:#FFFEFB;
  --ink:#1B1B1B;
  --graphite:#5C5C5C;
  --line:#2A2A2A;
  --soft:#D8D4CC;
  --hatch:rgba(27,27,27,.08);
  --shadow:4px 4px 0 rgba(27,27,27,.12);
  --font-display:"Georgia","Times New Roman","Songti SC",serif;
  --font-body:"Segoe UI","Microsoft YaHei UI","PingFang SC",sans-serif;
  --font-cap:"Courier New","Consolas","Microsoft YaHei UI",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);font-family:var(--font-body);line-height:1.58;
  background:
    repeating-linear-gradient(0deg,transparent 0 23px,var(--hatch) 23px 24px),
    repeating-linear-gradient(90deg,transparent 0 23px,var(--hatch) 23px 24px),
    var(--paper);
}
img{display:block;max-width:100%;height:auto;filter:grayscale(1) contrast(1.05)}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.wrap{width:min(1080px,92%);margin:0 auto}

.sketch-top{
  position:sticky;top:0;z-index:40;
  background:rgba(255,254,251,.94);
  border-bottom:2px solid var(--ink);
}
.sketch-top-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 0}
.logo{display:flex;align-items:center;gap:.6rem}
.logo-mark{
  width:2.1rem;height:2.1rem;display:grid;place-items:center;
  border:2px solid var(--ink);border-radius:50% 40% 55% 45%;
  font-family:var(--font-display);font-weight:700;background:var(--sheet);
}
.logo b{font-family:var(--font-display);font-size:1.25rem;letter-spacing:.02em}
.logo small{display:block;font-family:var(--font-cap);font-size:.68rem;color:var(--graphite);letter-spacing:.06em}
.nav{display:flex;flex-wrap:wrap;gap:.85rem;font-size:.9rem}
.nav a{color:var(--graphite);border-bottom:1px dashed transparent}
.nav a:hover,.nav a.on{color:var(--ink);border-bottom-color:var(--ink)}

/* signature: figure caption strip */
.fig-strip{
  display:flex;gap:.7rem;overflow-x:auto;padding:.7rem 0;
  border-bottom:1px dashed var(--ink);
  font-family:var(--font-cap);font-size:.72rem;color:var(--graphite);
}
.fig-strip span{white-space:nowrap}
.fig-strip em{font-style:normal;color:var(--ink);font-weight:700;margin-right:.25rem}

.hero{padding:2rem 0 1.2rem}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:1.4rem;align-items:center}
.eyebrow{
  font-family:var(--font-cap);font-size:.75rem;letter-spacing:.08em;
  color:var(--graphite);margin-bottom:.45rem;text-transform:uppercase;
}
.hero h1{
  margin:0 0 .55rem;font-family:var(--font-display);
  font-size:clamp(1.9rem,4vw,2.75rem);line-height:1.15;font-weight:700;
}
.hero-lead{margin:0 0 1rem;color:var(--graphite);max-width:34rem}
.cta-row{display:flex;flex-wrap:wrap;gap:.6rem;margin-bottom:.9rem}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:9rem;padding:.68rem 1.1rem;
  border:2px solid var(--ink);background:var(--sheet);
  font-family:var(--font-display);font-size:.95rem;
  white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb;
  box-shadow:var(--shadow);transition:transform .12s ease,box-shadow .12s ease;
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 rgba(27,27,27,.16)}
.btn-pri{background:var(--ink);color:#fff}
.btn-sec{background:var(--sheet);color:var(--ink)}
.btn-ghost{background:transparent;color:#fff;border-color:#fff;box-shadow:none}
.req{
  display:grid;grid-template-columns:1fr 1fr;gap:.5rem;
  padding:.75rem;border:1.5px dashed var(--ink);background:rgba(255,254,251,.8);
  font-size:.84rem;color:var(--graphite);
}
.req b{display:block;font-family:var(--font-cap);font-size:.7rem;color:var(--ink);margin-bottom:.12rem}
.frame{
  align-self:center;margin:0;padding:.55rem;border:2px solid var(--ink);
  background:var(--sheet);box-shadow:var(--shadow);position:relative;
}
.frame::after{
  content:"Fig.01 — Workspace";position:absolute;left:.55rem;bottom:.45rem;
  font-family:var(--font-cap);font-size:.68rem;background:var(--sheet);
  padding:.1rem .35rem;border:1px solid var(--ink);
}
.frame img{
  display:block;width:100%;height:auto;object-fit:contain;object-position:center;
  margin:0;padding:0;min-height:0;max-height:none;clip-path:none;transform:none;
  border:1px solid var(--soft);
}

section{padding:2rem 0}
.sec-h{margin-bottom:1rem}
.sec-h h2{margin:0 0 .25rem;font-family:var(--font-display);font-size:clamp(1.35rem,2.6vw,1.8rem)}
.sec-h p{margin:0;color:var(--graphite);max-width:40rem}
.cap{font-family:var(--font-cap);font-size:.72rem;letter-spacing:.08em;color:var(--graphite);margin-bottom:.25rem}

#download .board{
  border:2px solid var(--ink);background:var(--sheet);padding:1rem;
  box-shadow:var(--shadow);
}
.sketches{display:grid;grid-template-columns:repeat(4,1fr);gap:.8rem}
.sketch-card{
  border:1.5px solid var(--ink);padding:.85rem .75rem;
  display:flex;flex-direction:column;gap:.5rem;background:#fff;
  position:relative;
}
.sketch-card .tag{
  font-family:var(--font-cap);font-size:.68rem;letter-spacing:.04em;
}
.sketch-card h3{margin:0;font-family:var(--font-display);font-size:1.15rem}
.sketch-card img{
  width:100%;height:auto;object-fit:contain;object-position:center;
  margin:0;padding:0;border:1px solid var(--soft);background:var(--paper);
}
.sketch-card ul{margin:0;padding:0;list-style:none;font-size:.84rem;color:var(--graphite)}
.sketch-card li{display:flex;justify-content:space-between;gap:.35rem;padding:.2rem 0;border-bottom:1px dotted var(--soft)}
.sketch-card .btn{width:100%;margin-top:auto;box-shadow:none}

.feats{display:grid;grid-template-columns:repeat(5,1fr);gap:.65rem}
.feat{
  border:1.5px solid var(--ink);background:var(--sheet);padding:.9rem .75rem;
}
.feat .ico{
  width:2rem;height:2rem;margin-bottom:.5rem;display:grid;place-items:center;
  border:1.5px solid var(--ink);border-radius:40% 55% 45% 50%;
  font-family:var(--font-cap);font-size:.7rem;
}
.feat h3{margin:0 0 .3rem;font-size:1rem;font-family:var(--font-display)}
.feat p{margin:0;font-size:.84rem;color:var(--graphite)}

.solution{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;align-items:start}
.sol-copy{
  border:2px solid var(--ink);background:var(--sheet);padding:1.2rem 1.1rem;box-shadow:var(--shadow);
}
.sol-copy h2{margin:0 0 .5rem;font-family:var(--font-display);font-size:1.5rem}
.sol-copy p{margin:0 0 .7rem;color:var(--graphite)}
.sol-media{display:grid;gap:.7rem}
.sol-media .frame::after{content:"Fig.02 — Product"}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:.7rem}
.pair .frame::after{content:"Fig."}

.trust{
  text-align:center;padding:1.5rem 1rem;border:2px solid var(--ink);
  background:var(--ink);color:#f5f3ee;
}
.trust .big{font-family:var(--font-display);font-size:clamp(1.7rem,3.4vw,2.4rem);margin-bottom:.35rem}
.trust .big span{text-decoration:underline;text-underline-offset:.15em}
.trust p{margin:.2rem auto 1rem;max-width:34rem;opacity:.9}
.brands{display:flex;flex-wrap:wrap;justify-content:center;gap:.45rem}
.brands span{
  padding:.35rem .7rem;border:1px solid rgba(255,255,255,.45);
  font-family:var(--font-display);font-size:.9rem;
}

.split{display:grid;grid-template-columns:1.1fr .9fr;gap:1rem}
.panel{
  border:2px solid var(--ink);background:var(--sheet);padding:1.05rem 1rem;box-shadow:var(--shadow);
}
.panel h2{margin:0 0 .7rem;font-family:var(--font-display);font-size:1.25rem}
.news{list-style:none;margin:0;padding:0}
.news li{padding:.55rem 0;border-bottom:1px dashed var(--soft)}
.news li:last-child{border-bottom:0}
.news time{display:block;font-family:var(--font-cap);font-size:.68rem;color:var(--graphite);margin-bottom:.12rem}
.news a:hover{text-decoration:underline}
.faq details{border:1px solid var(--ink);padding:.5rem .65rem;margin-bottom:.4rem;background:#fff}
.faq summary{cursor:pointer;font-weight:600}
.faq p{margin:.4rem 0 0;font-size:.9rem;color:var(--graphite)}

.cta-band{
  margin-bottom:1.6rem;border:2px solid var(--ink);color:#fff;
  background:linear-gradient(120deg,rgba(27,27,27,.88),rgba(27,27,27,.7)),url("5.png") center/cover no-repeat;
}
.cta-band .inner{padding:1.5rem 1.2rem}
.cta-band h2{margin:0 0 .4rem;font-family:var(--font-display);font-size:clamp(1.3rem,3vw,1.85rem)}
.cta-band p{margin:0 0 .85rem;max-width:36rem;opacity:.92}
.gains{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.85rem}
.gains span{padding:.28rem .55rem;border:1px solid rgba(255,255,255,.45);font-size:.8rem;font-family:var(--font-cap)}

.foot{border-top:2px solid var(--ink);padding:1rem 0 1.4rem;font-size:.86rem;color:var(--graphite);background:rgba(255,254,251,.7)}
.foot-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.7rem}
.foot nav{display:flex;gap:.8rem}
.foot a:hover{color:var(--ink);text-decoration:underline}

.page-hero{padding:1.4rem 0 1rem;border-bottom:1px dashed var(--ink)}
.page-hero h1{margin:0 0 .35rem;font-family:var(--font-display);font-size:clamp(1.45rem,3vw,2rem)}
.page-hero p{margin:0;color:var(--graphite);max-width:40rem}
.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.help-card{border:1.5px solid var(--ink);background:var(--sheet);padding:1rem}
.help-card h3{margin:0 0 .35rem;font-family:var(--font-display)}
.help-card p{margin:0;font-size:.9rem;color:var(--graphite)}

@media (max-width:960px){
  .hero-grid,.solution,.split{grid-template-columns:1fr}
  .sketches{grid-template-columns:1fr 1fr}
  .feats{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:640px){
  .nav{display:none}
  .sketches,.feats,.help-grid,.pair,.req{grid-template-columns:1fr}
  .cta-row .btn{flex:1 1 100%}
}
.hero-grid{align-items:center}
.frame{align-self:center;height:auto}
.frame img{
  display:block;width:100%;height:auto;object-fit:contain;object-position:center;
  margin:0;padding:0;min-height:0;max-height:none;clip-path:none;transform:none;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn:hover{transform:none}
}