:root{
  --ink:#14110f; --ink2:#4a4542; --muted:#7d7772;
  --line:#e4e0d8; --paper:#faf8f4; --card:#ffffff;
  --accent:#8a5a3b; --accent-soft:#f4ece5;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Songti SC",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue","PingFang SC",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px}
.serif{font-family:var(--serif)}

/* header */
header{
  position:sticky;top:0;z-index:50;background:rgba(250,248,244,.88);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.hd{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.logo{display:flex;flex-direction:column;line-height:1.1}
.logo b{font-family:var(--serif);font-size:21px;letter-spacing:.16em;font-weight:600}
.logo span{font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-top:3px}
nav{display:flex;align-items:center;gap:26px}
nav a{font-size:13.5px;color:var(--ink2);letter-spacing:.02em;position:relative;padding:4px 0}
nav a:hover{color:var(--ink)}
nav a.on{color:var(--ink)}
nav a.on::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1.5px;background:var(--accent)}
.langs{display:flex;gap:2px;margin-left:8px;border-left:1px solid var(--line);padding-left:14px}
.langs a{font-size:11.5px;letter-spacing:.08em;color:var(--muted);padding:3px 5px;border-radius:3px}
.langs a:hover{color:var(--ink)}
.langs a.on{color:var(--ink);background:var(--accent-soft)}
.burger{display:none;background:none;border:0;padding:8px;cursor:pointer}
.burger span{display:block;width:20px;height:1.5px;background:var(--ink);margin:4px 0}

/* kicker + headings */
.kicker{
  font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);margin:0 0 14px;font-weight:600;
}
h1,h2,h3{font-family:var(--serif);font-weight:500;letter-spacing:-.015em;margin:0}
h1{font-size:clamp(34px,4.6vw,58px);line-height:1.06}
h2{font-size:clamp(26px,3vw,36px);line-height:1.15}
h3{font-size:19px;line-height:1.3}
.lead{font-size:17px;color:var(--ink2);max-width:60ch;line-height:1.7}

/* hero */
.hero{padding:76px 0 64px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.hero h1{margin-bottom:22px}
.hero .lead{margin:0 0 12px}
.hero-note{font-size:13px;color:var(--muted);margin:0 0 28px}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:13px 26px;font-size:14px;letter-spacing:.02em;
  border:1px solid var(--ink);border-radius:2px;transition:.18s;cursor:pointer;font-family:var(--sans);
}
.btn.pri{background:var(--ink);color:#fff}
.btn.pri:hover{background:var(--accent);border-color:var(--accent)}
.btn.sec{background:transparent;color:var(--ink)}
.btn.sec:hover{background:var(--ink);color:#fff}

/* hero art */
.hero-art{position:relative;aspect-ratio:4/3;background:var(--accent-soft);border:1px solid var(--line);border-radius:3px;overflow:hidden}
.hero-art svg{position:absolute;inset:0;width:100%;height:100%}

/* sections */
section{padding:78px 0}
.sec-head{margin-bottom:40px}
.sec-head .lead{margin-top:14px}
.rule{height:1px;background:var(--line);margin:0}

/* categories */
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cat{border-top:1px solid var(--ink);padding-top:18px}
.cat .ph{margin-bottom:16px}
.cat h3{margin-bottom:8px}
.cat p{margin:0;font-size:14px;color:var(--ink2);line-height:1.6}

/* photo placeholder */
.ph{
  position:relative;aspect-ratio:4/3;background:
    repeating-linear-gradient(135deg,#f2eee7 0 10px,#efeae2 10px 20px);
  border:1px solid var(--line);border-radius:2px;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.ph img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.ph span{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#a89f93;text-align:center;padding:0 12px}

/* why */
.why{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--line)}
.why-item{padding:32px 32px 32px 0;border-bottom:1px solid var(--line)}
.why-item:nth-child(odd){border-right:1px solid var(--line);padding-right:36px}
.why-item:nth-child(even){padding-left:36px}
.why-item .n{font-family:var(--serif);font-size:12px;color:var(--accent);letter-spacing:.14em;margin-bottom:10px}
.why-item h3{margin-bottom:8px}
.why-item p{margin:0;font-size:14.5px;color:var(--ink2)}

/* strip */
.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;background:#fff}
.strip-in{display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.strip-t{font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.strip ul{display:flex;gap:28px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.strip li{font-size:13.5px;color:var(--ink2)}

/* process */
.proc{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.proc .st{border-top:1.5px solid var(--ink);padding-top:16px}
.proc .st .n{font-family:var(--serif);font-size:12px;color:var(--accent);letter-spacing:.1em;margin-bottom:8px}
.proc .st h3{font-size:17px;margin-bottom:6px}
.proc .st p{margin:0;font-size:13.5px;color:var(--ink2)}

/* band */
.band{background:var(--ink);color:#fff;padding:66px 0}
.band h2{color:#fff;max-width:22ch;margin-bottom:14px}
.band p{color:#c9c4bf;max-width:52ch;margin:0 0 26px;font-size:15px}
.band .btn.pri{background:#fff;color:var(--ink);border-color:#fff}
.band .btn.pri:hover{background:var(--accent);border-color:var(--accent);color:#fff}

/* page head */
.phead{padding:64px 0 52px;border-bottom:1px solid var(--line)}
.phead h1{margin-bottom:18px;max-width:24ch}

/* product blocks */
.pblock{display:grid;grid-template-columns:.95fr 1.05fr;gap:52px;padding:56px 0;border-bottom:1px solid var(--line);align-items:start}
.pblock:last-child{border-bottom:0}
.pblock h2{margin-bottom:12px}
.pblock p{margin:0 0 22px;color:var(--ink2);font-size:15px;max-width:46ch}
.spec{width:100%;border-collapse:collapse;margin-bottom:20px}
.spec td{padding:9px 0;border-bottom:1px solid var(--line);font-size:13.5px;vertical-align:top}
.spec td:first-child{width:38%;color:var(--muted);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.tlink{font-size:13.5px;color:var(--accent);border-bottom:1px solid currentColor;padding-bottom:2px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin:0 0 12px}
.stats .s{border-top:1.5px solid var(--ink);padding-top:16px}
.stats .v{font-family:var(--serif);font-size:clamp(30px,3.4vw,42px);line-height:1;letter-spacing:-.02em}
.stats .l{font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-top:8px}

/* cert grid */
.certs{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.certs div{background:#fff;padding:26px 20px;font-size:13.5px;text-align:center}

/* timeline table */
.tt{width:100%;border-collapse:collapse}
.tt td{padding:14px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.tt td:last-child{text-align:right;color:var(--ink2)}

/* faq */
.faq{margin-top:8px}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-size:15.5px;font-family:var(--serif);list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent);font-size:18px;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq p{margin:12px 0 0;font-size:14px;color:var(--ink2);max-width:62ch}

/* about */
.prose p{font-size:16.5px;color:var(--ink2);max-width:66ch;line-height:1.8;margin:0 0 20px}
.tm{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:14px}
.tm div{background:#fff;padding:28px}
.tm b{font-family:var(--serif);font-size:20px;display:block;margin-bottom:6px;letter-spacing:.02em}
.tm span{font-size:12.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}

/* contact */
.cgrid{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:start}
form .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.fld{margin-bottom:16px}
label{display:block;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
input,select,textarea{
  width:100%;padding:11px 12px;border:1px solid var(--line);background:#fff;
  font-family:var(--sans);font-size:14.5px;color:var(--ink);border-radius:2px;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent)}
textarea{min-height:120px;resize:vertical}
.fine{font-size:12px;color:var(--muted);margin-top:14px}
.dinfo{border-top:1.5px solid var(--ink);padding-top:18px;margin-bottom:26px}
.dinfo div{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px}
.dinfo .k{color:var(--muted);font-size:12px;letter-spacing:.08em;text-transform:uppercase;padding-top:2px}
.dinfo a{border-bottom:1px solid var(--line)}
.dinfo a:hover{border-color:var(--accent);color:var(--accent)}

/* footer */
footer{background:#fff;border-top:1px solid var(--line);padding:52px 0 34px;margin-top:0}
.fgrid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px;margin-bottom:40px}
.fgrid h4{font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0 0 14px;font-weight:600}
.fgrid p{font-size:13.5px;color:var(--ink2);margin:0 0 10px;max-width:34ch}
.fgrid a{font-size:13.5px;color:var(--ink2);display:block;margin-bottom:8px}
.fgrid a:hover{color:var(--accent)}
.fbot{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;gap:16px;font-size:12px;color:var(--muted);flex-wrap:wrap}

/* reveal —— 仅在 JS 可用时启用，保证无 JS/爬虫/打印时内容完整可见 */
html.js .rv{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
html.js .rv.in{opacity:1;transform:none}

@media(max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-art{order:-1;aspect-ratio:16/10}
  .cats{grid-template-columns:1fr 1fr}
  .proc{grid-template-columns:1fr 1fr;gap:28px}
  .stats{grid-template-columns:1fr 1fr;gap:22px}
  .pblock{grid-template-columns:1fr;gap:28px}
  .cgrid{grid-template-columns:1fr;gap:40px}
  .certs{grid-template-columns:1fr 1fr}
  .fgrid{grid-template-columns:1fr;gap:30px}
  nav{display:none}
  nav.open{display:flex;position:absolute;top:72px;left:0;right:0;background:var(--paper);
    flex-direction:column;align-items:flex-start;gap:0;padding:12px 28px 20px;border-bottom:1px solid var(--line)}
  nav.open a{padding:11px 0;width:100%;font-size:15px}
  nav.open a.on::after{display:none}
  nav.open .langs{border-left:0;padding-left:0;margin-left:0;margin-top:6px}
  .burger{display:block}
  section{padding:56px 0}
  .hero{padding:44px 0 48px}
  .why{grid-template-columns:1fr}
  .why-item,.why-item:nth-child(odd),.why-item:nth-child(even){padding:26px 0;border-right:0}
}
@media(max-width:560px){
  .cats{grid-template-columns:1fr}
  form .row{grid-template-columns:1fr}
  .tm{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
}
@media print{header,nav,.btns,form{display:none}}