*,*::before,*::after{box-sizing:border-box}
:root{
  --ink:#1b1a17; --ink2:#4a473f; --ink3:#7b7669;
  --paper:#fbf9f5; --card:#ffffff; --line:#e6e0d4; --line2:#d5cdbd;
  --accent:#0f4a44; --accent-l:#e8f0ee; --copper:#a9662a; --copper-l:#f7efe6;
  --max:1080px;
}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);
  font:16px/1.75 "PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  font-feature-settings:"kern" 1}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(15,74,68,.28)}
a:hover{border-bottom-color:var(--accent)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.serif{font-family:"Songti SC","SimSun","Noto Serif SC",Georgia,serif}

/* header */
header.site{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
header.site .bar{max-width:var(--max);margin:0 auto;padding:0 22px;height:64px;
  display:flex;align-items:center;justify-content:space-between;gap:18px}
.logo{display:flex;align-items:baseline;gap:9px;border:0}
.logo b{font-size:21px;letter-spacing:.14em;font-weight:700;color:var(--ink)}
.logo span{font-size:11px;letter-spacing:.2em;color:var(--ink3);text-transform:uppercase}
nav.main{display:flex;gap:24px;flex-wrap:wrap}
nav.main a{border:0;font-size:14.5px;color:var(--ink2);padding:4px 0;border-bottom:2px solid transparent}
nav.main a:hover,nav.main a[aria-current]{color:var(--accent);border-bottom-color:var(--accent)}

/* hero */
.hero{background:linear-gradient(180deg,#fff 0%,#f6f2ea 100%);border-bottom:1px solid var(--line);padding:58px 0 46px}
.hero .kicker{font-size:12.5px;letter-spacing:.22em;color:var(--copper);text-transform:uppercase;margin:0 0 14px}
.hero h1{font-size:clamp(28px,4.4vw,44px);line-height:1.28;margin:0 0 18px;letter-spacing:.01em;font-weight:700}
.hero .lede{font-size:17.5px;color:var(--ink2);max-width:760px;margin:0 0 8px}

/* answer box */
.answer{background:var(--card);border:1px solid var(--line2);border-left:4px solid var(--accent);
  border-radius:3px;padding:22px 24px;margin:30px 0 0}
.answer h2{margin:0 0 10px;font-size:15px;letter-spacing:.1em;color:var(--accent);font-weight:700}
.answer p{margin:0;font-size:16.5px;color:var(--ink)}

/* sections */
section{padding:52px 0}
section+section{border-top:1px solid var(--line)}
h2.sec{font-size:24px;margin:0 0 6px;letter-spacing:.01em}
p.sub{color:var(--ink3);margin:0 0 28px;font-size:14.5px}
h3{font-size:18px;margin:32px 0 10px}
p{margin:0 0 14px}
ul,ol{margin:0 0 16px;padding-left:22px}
li{margin:0 0 8px}
strong{font-weight:700}

/* cards */
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(268px,1fr))}
.grid.two{grid-template-columns:repeat(2,1fr)}
@media(max-width:720px){.grid.two{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:4px;padding:20px 20px 18px}
.card h3{margin:0 0 6px;font-size:17px}
.card .tagline{font-size:12.5px;color:var(--copper);letter-spacing:.08em;margin:0 0 10px}
.card dl{margin:0;font-size:14px;color:var(--ink2)}
.card dt{display:inline;color:var(--ink3)}
.card dd{display:inline;margin:0}
.card dl>div{margin-bottom:5px}

/* product photo */
.card .ph{margin:0 0 16px;background:#fff;border-radius:3px;overflow:hidden;
  aspect-ratio:1/1;display:grid;place-items:center}
.card .ph img{width:100%;height:100%;object-fit:cover}
.thumb-grid{display:grid;gap:16px;grid-template-columns:repeat(3,1fr);margin:0 0 22px}
@media(max-width:520px){.thumb-grid{gap:10px}}
.thumb{background:var(--card);border:1px solid var(--line);border-radius:4px;overflow:hidden;border-bottom-width:1px}
.thumb a{border:0;display:block;color:var(--ink2)}
.thumb .ph{aspect-ratio:1/1;background:#fff;display:grid;place-items:center}
.thumb .ph img{width:100%;height:100%;object-fit:cover}
.thumb b{display:block;font-size:13.5px;font-weight:600;padding:10px 10px 11px;color:var(--ink);text-align:center}
@media(max-width:520px){.thumb b{font-size:12px;padding:7px 4px 8px}}
figure.shot{margin:0 0 24px;background:#fff;border:1px solid var(--line);border-radius:4px;padding:18px;text-align:center}
figure.shot img{margin:0 auto;max-width:520px;width:100%;border-radius:3px}
figure.shot figcaption{font-size:13px;color:var(--ink3);margin-top:12px;line-height:1.6;text-align:left}

/* table */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;
  border:1px solid var(--line);margin:0 0 18px}
.tbl th,.tbl td{padding:11px 13px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:#f4efe6;font-weight:600;font-size:13.5px;color:var(--ink2);white-space:nowrap}
.tbl tr:last-child td{border-bottom:0}
.tbl td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
.tbl th:first-child,.tbl td:first-child{white-space:nowrap}
.tbl col.c-name{width:22%}
.tbl col.c-mid{width:20%}
.tbl col.c-wide{width:44%}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
.scroll>.tbl{min-width:720px}
@media(min-width:721px){.scroll>.tbl{min-width:0}}

/* callout */
.note{background:var(--copper-l);border:1px solid #e8d5bf;border-radius:3px;padding:16px 18px;
  font-size:14.5px;color:#5d3d1c;margin:0 0 20px}
.note b{color:#8a4f18}
.safe{background:var(--accent-l);border:1px solid #cfe0dc;border-radius:3px;padding:16px 18px;
  font-size:14.5px;color:#0d3b36}
.safe b{color:var(--accent)}

/* chart */
figure.chart{margin:0 0 22px;background:#fff;border:1px solid var(--line);border-radius:4px;padding:20px}
figure.chart figcaption{font-size:13px;color:var(--ink3);margin-top:12px;line-height:1.6}
.bar-row{display:grid;grid-template-columns:158px 1fr 76px;align-items:center;gap:12px;margin-bottom:10px}
.bar-row .lb{font-size:13.5px;color:var(--ink2);white-space:nowrap}
.bar-track{display:block;background:#f1ece2;height:22px;border-radius:2px;position:relative;min-width:0;overflow:hidden}
.bar-fill{display:block;background:linear-gradient(90deg,var(--accent),#2c7d73);height:100%;border-radius:2px;min-width:3px}
.bar-row .vl{font-size:13.5px;text-align:right;font-variant-numeric:tabular-nums;color:var(--ink)}

/* steps */
.steps{counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;position:relative;padding-left:42px;margin-bottom:16px}
.steps li::before{content:counter(s);position:absolute;left:0;top:1px;width:26px;height:26px;
  background:var(--accent);color:#fff;border-radius:50%;display:grid;place-items:center;
  font-size:13px;font-weight:700}

/* faq */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:16px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:16.5px;list-style:none;position:relative;padding-right:26px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:2px;top:-1px;color:var(--copper);font-size:20px}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:12px 0 2px;color:var(--ink2);font-size:15.5px}
.faq .a p:last-child{margin-bottom:0}

/* footer */
footer.site{background:#14201e;color:#cfcabf;padding:44px 0 30px;font-size:14px}
footer.site a{color:#e6e1d6;border-bottom-color:rgba(230,225,214,.3)}
footer.site .cols{display:grid;gap:26px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-bottom:26px}
footer.site h4{color:#fff;font-size:13.5px;letter-spacing:.14em;margin:0 0 12px;font-weight:600}
footer.site ul{list-style:none;padding:0;margin:0}
footer.site li{margin-bottom:7px}
footer.site .legal{border-top:1px solid rgba(255,255,255,.13);padding-top:20px;font-size:12.5px;
  color:#9d988c;line-height:1.8}
footer.site .legal strong{color:#cfcabf}
.updated{font-size:12.5px;color:var(--ink3);margin-top:26px;padding-top:14px;border-top:1px dashed var(--line2)}
@media(max-width:640px){
  .hero{padding:40px 0 34px}
  section{padding:38px 0}
  nav.main{gap:18px;font-size:13.5px;flex-wrap:nowrap;overflow-x:auto;width:100%;
    padding:0 0 4px;scrollbar-width:none}
  nav.main::-webkit-scrollbar{display:none}
  nav.main a{white-space:nowrap;flex:0 0 auto}
  header.site .bar{height:auto;padding:12px 18px;flex-direction:column;align-items:flex-start;gap:8px}
  .bar-row{grid-template-columns:104px 1fr 66px;gap:7px}
}