:root{
  --paper:#f0ede5;      /* 麻色底：来自粒料包装与工业纸袋 */
  --ink:#1e2226;
  --ink-soft:#4a5157;
  --line:#1e2226;
  --accent:#c96a1e;     /* 树脂粒料的琥珀橙 */
  --accent-dark:#8f4712;
  --block:#dcd7cb;
  --step:4px;
  --fs-body:16px; --fs-lead:19px; --fs-h3:20px; --fs-h2:30px; --fs-h1:44px; --fs-hero:clamp(34px,6vw,64px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:var(--fs-body);line-height:1.75}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent-dark);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--accent)}
a:focus-visible,summary:focus-visible,.btn:focus-visible{outline:2px solid var(--accent-dark);outline-offset:2px}
.wrap{max-width:1280px;margin:0 auto;padding:0 24px}
/* header */
.site-head{border-bottom:3px solid var(--line);background:var(--paper)}
.head-row{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;padding:16px 24px}
.site-head nav{display:flex;flex-wrap:wrap;gap:4px 24px}
.site-head nav a{color:var(--ink);text-decoration:none;font-weight:600;font-size:15px;letter-spacing:.06em;padding:4px 0;border-bottom:2px solid transparent}
.site-head nav a:hover{border-bottom-color:var(--accent)}
/* breadcrumb */
.breadcrumb{max-width:1280px;margin:0 auto;padding:12px 24px;font-size:12px;letter-spacing:.08em;color:var(--ink-soft)}
.breadcrumb a{color:var(--ink-soft)}
.breadcrumb span{margin:0 6px}
/* type */
h1{font-size:var(--fs-h1);line-height:1.2;font-weight:800;letter-spacing:.01em}
h2{font-size:var(--fs-h2);font-weight:800;border-left:6px solid var(--accent);padding-left:12px;margin-bottom:16px}
h3{font-size:var(--fs-h3);font-weight:700}
p{max-width:68ch}
.kicker{font-size:13px;font-weight:700;letter-spacing:.18em;color:var(--accent-dark);text-transform:uppercase}
section{padding:64px 0}
figcaption{font-size:12px;color:var(--ink-soft);letter-spacing:.06em;margin-top:8px}
/* buttons */
.btn{display:inline-block;background:var(--ink);color:var(--paper);padding:12px 24px;text-decoration:none;font-weight:700;border:2px solid var(--ink)}
.btn:hover{background:var(--accent-dark);border-color:var(--accent-dark);color:#fff}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--paper)}
.cta-row{display:flex;gap:16px;flex-wrap:wrap;margin-top:24px}
/* hero: left copy / right figure */
.hero-split{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:48px;align-items:center;padding-top:64px;padding-bottom:64px}
.hero-copy .lead{font-size:var(--fs-lead);margin-top:24px}
.hero-fig{border:3px solid var(--line)}
.hero-fig img{width:100%}
/* capabilities */
.caps{border-top:3px solid var(--line)}
.cap-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.cap{border-top:2px solid var(--line);padding-top:16px}
.cap h3{color:var(--accent-dark);margin-bottom:12px}
/* strip */
.strip{display:grid;grid-template-columns:auto auto auto auto;gap:24px;align-items:center;background:var(--ink);color:var(--paper)}
.strip p:not(.strip-num){max-width:40ch}
.strip-num{font-size:56px;font-weight:800;color:var(--accent);max-width:none}
/* nine grid (contract) */
.items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.items>h2,.items>.sec-lead{grid-column:1/-1}
.items h2{border-left:none;padding-left:0}
.item{border:2px solid var(--line);background:#fff;padding:0 0 16px}
.item img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;display:block;border-bottom:2px solid var(--line)}
.item h2,.item h3{padding:12px 16px 0;font-size:18px}
.item p{padding:8px 16px 0;font-size:14px;color:var(--ink-soft)}
.item ul{list-style:none;padding:8px 16px 0;font-size:14px}
.item li{padding-left:16px;position:relative}
.item li::before{content:"";position:absolute;left:0;top:.6em;width:8px;height:2px;background:var(--accent)}
.sec-lead{margin-bottom:16px}
@media(max-width:760px){.items{grid-template-columns:minmax(0,1fr)}}
/* process */
.process{border-top:3px solid var(--line)}
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;counter-reset:s}
.steps.vertical{grid-template-columns:1fr;max-width:760px}
.steps li{border-top:2px solid var(--line);padding-top:12px}
.steps span{font-size:12px;font-weight:800;letter-spacing:.18em;color:var(--accent)}
.steps h3{margin:8px 0}
.steps.vertical li{margin-bottom:24px}
/* faq */
.faq details,.faq-page details{border-top:1px solid var(--ink-soft);padding:12px 0;max-width:68ch}
.faq summary,.faq-page summary{font-weight:700;cursor:pointer}
.faq details p,.faq-page details p{margin-top:8px;color:var(--ink-soft);font-size:15px}
.faq-page h2{margin-top:32px}
.more-link{margin-top:24px;font-size:14px;color:var(--ink-soft)}
/* cta band */
.cta-band{background:var(--accent);color:#fff;padding:48px 0}
.cta-band.alt{background:var(--ink)}
.cta-band h2{color:#fff;border-color:#fff}
.cta-band a{color:#fff}
.cta-band a:hover{color:var(--paper);text-decoration-color:var(--paper)}
/* services hero */
.svc-hero{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:center}
.svc-hero .lead{margin-top:16px}
.svc-hero figure{border:3px solid var(--line)}
/* about */
.about-hero img{margin-top:32px;border:3px solid var(--line)}
.about-text{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:48px;padding-top:0}
.about-col h2{margin-top:32px}
.about-col p{margin-top:12px}
.about-side{background:var(--block);border:2px solid var(--line);padding:24px;align-self:start}
.about-side dl{display:grid;grid-template-columns:auto 1fr;gap:8px 16px;font-size:14px;margin-top:12px}
.about-side dt{font-weight:700;color:var(--accent-dark)}
.about-cta{margin-top:24px;font-weight:600}
/* contact */
.contact-hero{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,6fr);gap:48px;align-items:center}
.mail-big a{font-size:clamp(20px,3.5vw,32px);font-weight:800}
.contact-hero .lead{margin-top:16px}
.contact-hero figure{border:3px solid var(--line)}
/* guide */
.guide{padding-top:32px;padding-bottom:64px}
.guide-head{border-bottom:3px solid var(--line);padding-bottom:32px;margin-bottom:32px}
.byline{font-size:13px;letter-spacing:.08em;color:var(--ink-soft);margin-top:8px}
.guide h2{margin-top:40px}
.guide p{margin-top:12px}
.guide table{width:100%;border-collapse:collapse;margin-top:24px;font-size:14px;background:#fff}
.guide caption{text-align:left;font-weight:700;padding-bottom:8px}
.guide th,.guide td{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}
.guide th{background:var(--block)}
/* footer */
.site-foot{border-top:3px solid var(--line);padding:32px 0;background:var(--block)}
.site-foot .wrap{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
.site-foot p{font-size:14px}
.site-foot nav{font-size:14px}
/* responsive */
@media(max-width:900px){
  .hero-split,.svc-hero,.about-text,.contact-hero{grid-template-columns:minmax(0,1fr)}
  .cap-grid{grid-template-columns:minmax(0,1fr)}
  .steps{grid-template-columns:minmax(0,1fr)}
  .strip{grid-template-columns:auto 1fr}
  h1{font-size:clamp(28px,7vw,44px)}
  h2{font-size:24px}
  section{padding:48px 0}
}