:root{
  --bg:#ffffff;
  --bg2:#f6f0e4;
  --ink:#2b2419;
  --dim:#6f6350;
  --line:rgba(43,36,25,.14);
  --copper:#9f6428;
  --leather:#a8702f;
  --alcantara:#9c4b30;
  --mesh:#6f8b4c;
  --textile:#47898d;
  --denim:#5e7fa9;
  --disp:"Space Grotesk","IBM Plex Sans","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --body:"IBM Plex Sans","PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  --serif:"Source Serif 4",Georgia,"Songti SC","SimSun",serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
.container{max-width:1140px;margin:0 auto;padding:0 24px}
a{color:inherit}

/* ===== header ===== */
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header .container{display:flex;align-items:center;gap:26px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--disp);font-weight:600;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);white-space:nowrap}
.brand svg{width:21px;height:21px;flex:none}
.nav{display:flex;gap:22px;margin-left:auto}
.nav a{color:var(--dim);text-decoration:none;font-size:13px;letter-spacing:.03em}
.nav a:hover{color:var(--ink)}

/* ===== hero ===== */
.hero{padding:84px 0 96px}
.hero .container{display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.kicker{font-family:var(--disp);font-size:11px;letter-spacing:.3em;text-transform:uppercase;color:var(--copper)}
h1{font-family:var(--disp);font-size:clamp(2.05rem,4.8vw,3.55rem);line-height:1.08;font-weight:600;letter-spacing:-.015em;margin:20px 0 22px}
.hero .lead{color:var(--dim);font-size:clamp(1rem,1.4vw,1.14rem);max-width:54ch}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.chip{border:1px solid var(--line);padding:7px 15px;font-family:var(--disp);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--dim)}
.hero-figure{margin:0}
.hero-figure img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center;display:block}
.hero-caption{font-size:12px;color:var(--dim);margin-top:12px;letter-spacing:.02em}

/* ===== sections ===== */
.section{padding:96px 0;border-top:1px solid var(--line)}
.section-head{max-width:780px;margin-bottom:54px}
.sec-no{font-family:var(--disp);font-size:12px;letter-spacing:.34em;text-transform:uppercase;color:var(--copper)}
h2{font-family:var(--disp);font-size:clamp(1.7rem,3.2vw,2.5rem);line-height:1.14;font-weight:600;letter-spacing:-.01em;margin:14px 0 18px}
.section-head p{color:var(--dim);font-size:15.5px}
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
.cols2 p{color:var(--dim);font-size:15.5px;margin-bottom:18px}
.cols2 p:last-child{margin-bottom:0}

/* what is */
.what-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px}
.what-card{border:1px solid var(--line);padding:28px 26px;background:var(--bg2)}
.what-card svg{width:26px;height:26px;color:var(--copper);margin-bottom:16px}
.what-card h3{font-family:var(--disp);font-size:17px;font-weight:600;margin-bottom:10px}
.what-card p{color:var(--dim);font-size:14.5px}
.callout{margin-top:52px;border-left:2px solid var(--copper);padding:4px 0 4px 24px;font-family:var(--serif);font-style:italic;font-size:clamp(1.15rem,2vw,1.4rem);line-height:1.5;color:var(--ink);max-width:46em}

/* ===== material gallery ===== */
.mat{border-top:1px solid var(--line);padding:90px 0}
.mat:first-of-type{border-top:0}
.mat-inner{display:grid;grid-template-columns:repeat(12,1fr);gap:48px;align-items:center}
.mat-text{grid-column:1/6}
.mat-fig{grid-column:6/13}
.mat.flip .mat-text{grid-column:8/13;order:2}
.mat.flip .mat-fig{grid-column:1/8;order:1}
.mat-no{font-family:var(--disp);font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--mat)}
.mat-name{font-family:var(--disp);font-size:clamp(2.5rem,5.6vw,4rem);line-height:1;font-weight:600;letter-spacing:-.01em;color:var(--mat);margin:12px 0 6px}
.mat-tag{font-family:var(--disp);font-size:13px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim);margin-bottom:22px}
.mat p{color:var(--dim);font-size:15.5px;margin-bottom:24px}
.tech-tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{border:1px solid var(--line);color:var(--ink);padding:5px 13px;font-family:var(--disp);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;border-radius:999px}
.tag{color:var(--mat);border-color:color-mix(in srgb,var(--mat) 42%,transparent)}
.mat-fig img{width:100%;display:block;height:auto}
.mat-fig .plate{margin-bottom:14px}
.fig-detail{width:74%;margin-left:auto}
.mat.flip .fig-detail{margin-left:0;margin-right:auto}

/* ===== technology map ===== */
.tech-grid{display:block}
table{width:100%;border-collapse:collapse;table-layout:fixed}
th,td{text-align:left;padding:16px 16px 16px 0;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--disp);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--dim);font-weight:500}
td.mat-cell{font-family:var(--disp);font-weight:600;font-size:15px;color:var(--ink);white-space:nowrap}
td.tech-cell{color:var(--dim);font-size:14px}
td.tech-cell b{color:var(--ink);font-weight:500}
.table-note{color:var(--dim);font-size:13px;margin-top:18px}
.table-warn{color:var(--dim);font-size:12.5px;margin-top:12px;padding:12px 16px;background:var(--bg2);border-left:2px solid var(--copper)}
.layer-legend{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.layer-legend span{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);padding:8px 14px;font-size:12.5px;color:var(--dim)}
.layer-legend b{font-family:var(--disp);color:var(--copper);font-weight:700}
.tech-fig{margin:0}
.tech-fig img{width:100%;display:block}
.tech-fig figcaption{font-size:12px;color:var(--dim);margin-top:10px}

/* ===== one mold ===== */
.mold-wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:44px}
.mold-fig{margin:0}
.mold-fig svg{width:100%;height:auto;display:block}
.mold-fig figcaption{font-size:12px;color:var(--dim);margin-top:12px}
.step-list{display:grid;gap:16px}
.step-card{border:1px solid var(--line);padding:22px 24px;background:var(--bg2);display:flex;gap:18px;align-items:flex-start}
.step-no{font-family:var(--disp);font-size:12px;letter-spacing:.08em;color:var(--copper);padding-top:3px;flex:none;width:24px}
.step-card h3{font-family:var(--disp);font-size:16.5px;font-weight:600;margin-bottom:6px}
.step-card p{color:var(--dim);font-size:14.5px}

/* ===== why ===== */
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.why-card{border:1px solid var(--line);padding:28px 26px;background:var(--bg2);position:relative}
.why-card::before{content:"";position:absolute;top:0;left:26px;right:26px;height:2px;background:var(--copper)}
.why-card svg{width:22px;height:22px;color:var(--copper);margin-bottom:16px}
.why-card h3{font-family:var(--disp);font-size:16.5px;font-weight:600;margin-bottom:10px}
.why-card p{color:var(--dim);font-size:14.5px}

/* ===== cta ===== */
.cta{text-align:center;padding:118px 0;border-top:1px solid var(--line)}
.cta h2{max-width:22em;margin-left:auto;margin-right:auto}
.cta .lead{color:var(--dim);max-width:44em;margin:0 auto 38px;font-size:15.5px}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--copper);color:#f7f1e4;font-family:var(--disp);font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:13px;padding:16px 36px;text-decoration:none;transition:filter .15s ease}
.btn:hover{filter:brightness(1.1)}
.cta-note{color:var(--dim);font-size:12.5px;margin-top:20px}

/* ===== footer ===== */
footer{border-top:1px solid var(--line);padding:36px 0}
footer .container{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--dim);font-size:12.5px}

/* ===== responsive ===== */
@media(max-width:980px){
  .hero .container{grid-template-columns:1fr;gap:40px}
  .hero-figure{max-width:440px;margin:0 auto}
  .mat-inner,.mat.flip .mat-inner{grid-template-columns:1fr;gap:34px}
  .mat-text,.mat.flip .mat-text,.mat-fig,.mat.flip .mat-fig{grid-column:auto;order:0}
  .fig-detail{width:70%}
  .what-grid{grid-template-columns:1fr 1fr}
  .tech-grid{grid-template-columns:1fr}
  .why-grid{grid-template-columns:1fr 1fr}
  .mold-wrap{grid-template-columns:1fr}
  .nav{display:none}
}
@media(max-width:560px){
  .section{padding:64px 0}
  .mat{padding:58px 0}
  .what-grid{grid-template-columns:1fr}
  .why-grid{grid-template-columns:1fr}
  .cols2{grid-template-columns:1fr;gap:26px}
  .cta{padding:84px 0}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}