:root{
  --ink:#10160f;
  --pcb:#17301f;
  --pcb-deep:#0d1f14;
  --copper:#c1702e;
  --copper-dark:#8e4f1c;
  --paper:#f4f1e8;
  --paper-2:#eae5d6;
  --line:#3c5a44;
  --muted:#5b6a5e;
  --fs-xl:clamp(2.6rem,6.5vw,5rem);
  --fs-l:clamp(1.6rem,3.2vw,2.4rem);
  --fs-m:1.25rem;
  --fs-b:1rem;
  --fs-s:.875rem;
  --fs-xs:.75rem;
  --gap:24px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--paper);color:var(--ink);
  font-size:var(--fs-b);line-height:1.75;
}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
a{color:var(--copper-dark);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--copper)}
a:focus-visible,summary:focus-visible,.btn:focus-visible{outline:2px solid var(--copper);outline-offset:3px}
h1,h2,h3{font-weight:800;letter-spacing:.02em;line-height:1.25}

/* header */
.site-header{background:var(--pcb-deep);border-bottom:3px solid var(--copper)}
.header-inner{display:flex;flex-wrap:wrap;align-items:center;gap:16px;padding:16px 24px;justify-content:space-between}
.brand img{display:block}
.site-nav{display:flex;flex-wrap:wrap;gap:8px}
.site-nav a{
  color:var(--paper);text-decoration:none;font-size:var(--fs-s);
  letter-spacing:.08em;padding:8px 12px;border:1px solid transparent;
}
.site-nav a:hover{border-color:var(--copper);color:#fff}
.site-nav a[aria-current],.site-nav a:hover{color:#fff}

/* breadcrumb */
.breadcrumb{
  max-width:1280px;margin:0 auto;padding:16px 24px 0;
  font-size:12px;letter-spacing:.12em;color:var(--muted);
}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--copper-dark)}
.breadcrumb span{margin:0 6px}

/* hero: index 超大字标题 */
.hero-index{padding:64px 0 48px;border-bottom:2px solid var(--line)}
.hero-index-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.kicker{font-size:var(--fs-xs);letter-spacing:.3em;text-transform:uppercase;color:var(--copper-dark);margin-bottom:16px}
.display{font-size:var(--fs-xl);line-height:1.1;color:var(--pcb)}
.lead{max-width:62ch;margin-top:24px;font-size:var(--fs-m)}
.hero-actions{margin-top:32px;display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-block;background:var(--copper);color:#fff;border:2px solid var(--copper);
  padding:12px 24px;text-decoration:none;font-weight:700;letter-spacing:.08em;
}
.btn:hover{background:var(--copper-dark);border-color:var(--copper-dark);color:#fff}
.btn-ghost{background:transparent;color:var(--copper-dark)}
.btn-ghost:hover{background:var(--paper-2);color:var(--copper-dark)}
.hero-figure{margin:0}
.hero-figure img{width:100%;height:auto;display:block;border:2px solid var(--pcb)}
figcaption{font-size:var(--fs-xs);letter-spacing:.15em;color:var(--muted);margin-top:8px}

/* capabilities */
.capabilities{padding:64px 0;border-bottom:2px solid var(--line)}
.capabilities h2,.items-section h2,.process h2,.faq-home h2,.items-section .container>h2{
  font-size:var(--fs-l);color:var(--pcb);margin-bottom:32px;
}
.num{color:var(--copper);font-size:var(--fs-s);letter-spacing:.2em;margin-right:12px;font-weight:700}
.cap-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.cap{border-top:4px solid var(--copper);padding-top:16px}
.cap h3{font-size:var(--fs-m);margin-bottom:12px;color:var(--pcb)}
.cap p{font-size:var(--fs-s);color:var(--ink)}

/* items 9-grid (契约) */
.items-section{padding:64px 0;border-bottom:2px solid var(--line)}
.section-note{margin-bottom:24px;color:var(--muted);font-size:var(--fs-s);max-width:62ch}
.items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.item{background:transparent;border:1px solid var(--line);padding:0 0 16px}
.item img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;display:block;border-bottom:2px solid var(--pcb)}
.item h2,.item h3{font-size:var(--fs-b);padding:12px 16px 0;color:var(--pcb)}
.item p{font-size:var(--fs-s);color:var(--ink);padding:8px 16px 0}
.item ul{list-style:none;padding:8px 16px 0}
.item li{font-size:var(--fs-xs);letter-spacing:.05em;color:var(--muted);padding-left:14px;position:relative}
.item li::before{content:"";position:absolute;left:0;top:.6em;width:7px;height:7px;background:var(--copper)}
@media(max-width:760px){.items{grid-template-columns:minmax(0,1fr)}}

/* process */
.process{padding:64px 0;border-bottom:2px solid var(--line)}
.process-list{list-style:none;counter-reset:step;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.process-list li{counter-increment:step;border-left:4px solid var(--copper);padding-left:16px}
.process-list li::before{content:"0" counter(step);font-size:var(--fs-l);font-weight:800;color:var(--pcb);display:block;line-height:1.2}
.process-list strong{display:block;color:var(--pcb);margin:8px 0 8px}
.process-list span{font-size:var(--fs-s);color:var(--ink)}

/* faq */
.faq-home{padding:64px 0}
.faq-list details,.faq-page-list details{border-bottom:1px solid var(--line);padding:12px 0}
.faq-list summary,.faq-page-list summary{cursor:pointer;font-weight:700;color:var(--pcb);padding:4px 0}
.faq-list details[open] summary,.faq-page-list details[open] summary{color:var(--copper-dark)}
.faq-list p,.faq-page-list p{font-size:var(--fs-s);margin-top:8px;max-width:62ch}
.faq-page-list h2{font-size:var(--fs-m);color:var(--pcb);margin:32px 0 8px;letter-spacing:.15em}
.faq-page-list h2:first-child{margin-top:0}

/* cta */
.cta{background:var(--pcb);color:var(--paper)}
.cta-inner{padding:64px 24px;display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.cta h2{font-size:var(--fs-l);max-width:26ch;color:var(--paper)}

/* hero variants per page */
.hero-about-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:end;padding:48px 24px 48px;max-width:1280px;margin:0 auto}
.hero-about h1,.hero-services h1,.hero-contact h1,.hero-faq h1,.guide h1{font-size:var(--fs-l);color:var(--pcb)}
.hero-about figure{margin:0}
.hero-about img{width:100%;height:auto;display:block;border-left:6px solid var(--copper)}
.hero-about .lead{margin-top:12px}
.hero-services{background:var(--pcb-deep)}
.hero-services-grid{padding:64px 24px}
.hero-services h1{color:var(--paper);font-size:var(--fs-xl)}
.hero-services .lead{color:var(--paper-2);max-width:62ch}
.hero-contact{background:var(--copper);color:#fff}
.hero-contact .container{padding:64px 24px}
.hero-contact h1{color:#fff;font-size:var(--fs-xl)}
.contact-mail{margin-top:16px;font-size:var(--fs-m);font-weight:700}
.contact-mail a{color:#fff}
.contact-mail a:hover{color:var(--paper-2)}
.hero-contact .lead{color:#fff;margin-top:16px}
.hero-faq{border-bottom:2px solid var(--line)}
.hero-faq .container,.guide-narrow{padding-top:48px;padding-bottom:48px}

/* about */
.about-cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;padding:64px 24px;border-bottom:2px solid var(--line)}
.about-cols h2{font-size:var(--fs-m);color:var(--pcb);border-bottom:2px solid var(--copper);display:inline-block;margin-bottom:12px}
.about-cols p{font-size:var(--fs-s)}

/* contact */
.process-contact{padding:64px 0;border-bottom:2px solid var(--line)}
.process-contact h2{font-size:var(--fs-l);color:var(--pcb);margin-bottom:32px}
.contact-faq{padding:64px 0}
.contact-faq h2{font-size:var(--fs-l);color:var(--pcb);margin-bottom:16px}

/* guide */
.guide-narrow{max-width:820px}
.guide h1{font-size:var(--fs-xl);color:var(--pcb)}
.guide .lead{font-size:var(--fs-b)}
.guide h2{font-size:var(--fs-m);color:var(--pcb);margin:48px 0 16px;padding-left:12px;border-left:4px solid var(--copper)}
.guide p{margin-bottom:16px;max-width:68ch}
.cmp-table{width:100%;border-collapse:collapse;margin:16px 0 32px;font-size:var(--fs-s)}
.cmp-table th,.cmp-table td{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}
.cmp-table th{background:var(--paper-2);color:var(--pcb);letter-spacing:.05em}

/* footer */
.site-footer{background:var(--pcb-deep);color:var(--paper-2);margin-top:0}
.footer-inner{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;padding:32px 24px;font-size:var(--fs-s)}
.footer-inner nav{display:flex;flex-wrap:wrap;gap:16px}
.footer-inner a{color:var(--paper-2)}
.footer-inner a:hover{color:var(--copper)}

/* responsive */
@media(max-width:900px){
  .hero-index-grid,.hero-about-grid,.cap-grid,.process-list,.about-cols{grid-template-columns:minmax(0,1fr)}
  .process-list{gap:32px}
  .cta-inner{flex-direction:column;align-items:flex-start}
}
img{max-width:100%}