/* Hengsheng Precision - editorial light system. Deliberately a different
   design language from the main JSHS satellite site: paper ground, serif
   display type, hairline rules, numbered sections, no cards, no shadows. */

:root{
  --paper:#FBFAF7;
  --paper-2:#F3EFE7;
  --ink:#17140F;
  --ink-2:#3A342B;
  --muted:#6E6558;
  --line:#E0D9CB;
  --line-2:#CFC5B2;
  --copper:#A85A2A;
  --copper-d:#8A4620;
  --forest:#1F3A2E;
  --max:1180px;
  --serif:'Iowan Old Style','Palatino Linotype',Palatino,Georgia,'Times New Roman',serif;
  --sans:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.65;
  font-feature-settings:"kern" 1;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--copper);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.14;letter-spacing:-.015em;margin:0}
h1{font-size:clamp(2.3rem,4.6vw,3.75rem)}
h2{font-size:clamp(1.6rem,2.5vw,2.2rem)}
h3{font-size:1.18rem;letter-spacing:-.005em}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.1em;padding-left:1.15em}
li{margin:0 0 .45em}
strong{font-weight:650}
hr{border:0;border-top:1px solid var(--line);margin:56px 0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 32px}
.narrow{max-width:760px}

.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:10px 16px;z-index:99;border:1px solid var(--line-2)}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:40;background:rgba(251,250,247,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.topbar-in{max-width:var(--max);margin:0 auto;padding:0 32px;display:flex;align-items:center;gap:26px;height:72px}
.brand{display:flex;align-items:baseline;gap:9px;color:var(--ink);text-decoration:none;flex:0 0 auto}
.brand:hover{text-decoration:none}
.brand b{font-family:var(--serif);font-size:1.24rem;font-weight:600;letter-spacing:-.01em;white-space:nowrap}
.brand i{font-style:normal;font-size:.6rem;letter-spacing:.19em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.brand .sq{width:9px;height:9px;background:var(--copper);display:inline-block;transform:translateY(-2px)}

.menu{margin-left:auto;display:flex;align-items:center;gap:22px}
.menu a{color:var(--ink-2);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;white-space:nowrap;padding:4px 0;border-bottom:1px solid transparent}
.menu a:hover{color:var(--ink);text-decoration:none;border-bottom-color:var(--line-2)}
.menu a[aria-current="page"]{color:var(--copper);border-bottom-color:var(--copper)}
.quote{flex:0 0 auto;display:inline-block;background:var(--ink);color:#fff;font-size:.76rem;letter-spacing:.11em;text-transform:uppercase;padding:11px 20px;white-space:nowrap;border:1px solid var(--ink)}
.quote:hover{background:var(--copper);border-color:var(--copper);color:#fff;text-decoration:none}

/* ---------- hero ---------- */
.hero{border-bottom:1px solid var(--line);padding:76px 0 64px}
.hero-in{display:grid;grid-template-columns:1fr 340px;gap:64px;align-items:end}
.kicker{font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--copper);margin:0 0 22px;font-weight:600}
.hero h1{margin-bottom:26px;max-width:19ch}
.hero .lede{font-size:1.1rem;color:var(--ink-2);max-width:52ch;margin-bottom:30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.btn{display:inline-block;padding:13px 24px;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;border:1px solid var(--ink);background:var(--ink);color:#fff}
.btn:hover{background:var(--copper);border-color:var(--copper);color:#fff;text-decoration:none}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--paper-2);color:var(--ink);border-color:var(--line-2)}
.spec{padding-left:22px;border-left:2px solid var(--copper)}
.spec dl{margin:0;display:grid;grid-template-columns:1fr;gap:14px}
.spec dt{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.spec dd{margin:3px 0 0;font-family:var(--serif);font-size:1.24rem;line-height:1.2}

/* ---------- numbered sections ---------- */
.sec{padding:64px 0;border-bottom:1px solid var(--line)}
.sec:last-of-type{border-bottom:0}
.sec-head{display:grid;grid-template-columns:88px 1fr;gap:34px;margin-bottom:34px}
.sec-no{font-family:var(--serif);font-size:1.05rem;color:var(--copper);padding-top:6px;border-top:1px solid var(--copper);height:100%}
.sec-head h2{max-width:26ch}
.sec-head p{color:var(--muted);margin:.65em 0 0;max-width:64ch;font-size:.98rem}
.body{display:grid;grid-template-columns:88px 1fr;gap:34px}
.body>.col{padding-left:0}

/* ---------- definition rows (used instead of cards) ---------- */
.rows{border-top:1px solid var(--line-2)}
.row{display:grid;grid-template-columns:210px 1fr;gap:34px;padding:24px 0;border-bottom:1px solid var(--line)}
.row .k{font-family:var(--serif);font-size:1.12rem;letter-spacing:-.01em}
.row .k span{display:block;font-family:var(--sans);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:6px}
.row p{margin:0;color:var(--ink-2);font-size:.98rem}
.row p+p{margin-top:.7em}

/* ---------- split feature ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.rev>.txt{order:2}
.split .fig{border:1px solid var(--line);background:var(--paper-2);padding:26px}
.fig-cap{font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:12px}

/* ---------- data table ---------- */
table{width:100%;border-collapse:collapse;font-size:.94rem;margin:0 0 1.2em}
caption{text-align:left;font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding-bottom:10px}
th,td{text-align:left;padding:11px 14px 11px 0;border-bottom:1px solid var(--line);vertical-align:top}
thead th{border-bottom:1px solid var(--ink);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
tbody th{font-weight:650;color:var(--ink)}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}

/* ---------- inline note ---------- */
.note{border-left:2px solid var(--copper);padding:2px 0 2px 20px;margin:26px 0;color:var(--ink-2);font-size:.97rem}
.note b{display:block;font-family:var(--serif);font-size:1.02rem;margin-bottom:5px;color:var(--ink)}

/* ---------- link list ---------- */
.links{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-2)}
.links li{margin:0;border-bottom:1px solid var(--line)}
.links a{display:flex;justify-content:space-between;align-items:baseline;gap:20px;padding:15px 0;color:var(--ink)}
.links a:hover{text-decoration:none;color:var(--copper)}
.links .t{font-family:var(--serif);font-size:1.06rem}
.links .m{font-size:.76rem;letter-spacing:.09em;text-transform:uppercase;color:var(--muted);white-space:nowrap}

/* ---------- breadcrumb ---------- */
.crumb{font-size:.76rem;letter-spacing:.06em;color:var(--muted);padding:16px 0 0}
.crumb a{color:var(--muted)}
.crumb span[aria-current]{color:var(--ink-2)}
.crumb .sep{padding:0 8px;color:var(--line-2)}

/* ---------- page head ---------- */
.phead{padding:34px 0 44px;border-bottom:1px solid var(--line)}
.phead h1{max-width:24ch;font-size:clamp(2rem,3.6vw,3rem)}
.phead .lede{max-width:66ch;margin-top:20px;color:var(--ink-2);font-size:1.05rem}
.phead .meta{margin-top:22px;font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);display:flex;gap:18px;flex-wrap:wrap}

/* ---------- CTA band ---------- */
.cta{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--paper-2);padding:52px 0}
.cta-in{display:flex;justify-content:space-between;align-items:center;gap:40px;flex-wrap:wrap}
.cta h2{font-size:clamp(1.5rem,2.4vw,2rem);max-width:22ch}
.cta p{margin:10px 0 0;color:var(--muted);max-width:52ch;font-size:.95rem}

/* ---------- forms ---------- */
.form{display:grid;grid-template-columns:1fr 1fr;gap:18px 20px}
.form .full{grid-column:1/-1}
label{display:block;font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:7px}
label .req{color:var(--copper)}
input,select,textarea{width:100%;font-family:var(--sans);font-size:16px;color:var(--ink);background:#fff;border:1px solid var(--line-2);padding:11px 13px;border-radius:0}
input:focus,select:focus,textarea:focus{outline:2px solid var(--copper);outline-offset:-1px;border-color:var(--copper)}
textarea{min-height:120px;resize:vertical}
.hint{font-size:.78rem;color:var(--muted);margin:6px 0 0}
.err{font-size:.78rem;color:#A32020;margin:5px 0 0;display:none}
.err.on{display:block}
.filetxt{font-size:.86rem;color:var(--muted);margin-top:8px}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line-2);background:var(--paper);padding:52px 0 30px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}
.foot h4{font-family:var(--sans);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;font-weight:600}
.foot ul{list-style:none;margin:0;padding:0;font-size:.92rem}
.foot li{margin-bottom:9px}
.foot a{color:var(--ink-2)}
.foot .about{font-size:.92rem;color:var(--muted);max-width:34ch}
.foot-bottom{margin-top:40px;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:.78rem;color:var(--muted)}

/* ---------- article ---------- */
.article{display:grid;grid-template-columns:230px 1fr;gap:56px;padding:44px 0 20px;align-items:start}
.toc{position:sticky;top:96px;font-size:.86rem}
.toc h4{font-family:var(--sans);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc li{margin:0}
.toc a{display:block;padding:6px 0 6px 14px;color:var(--muted);border-left:2px solid transparent;margin-left:-1px;font-size:.85rem;line-height:1.4}
.toc a:hover{color:var(--copper);text-decoration:none;border-left-color:var(--copper)}
.prose{max-width:720px}
.prose h2{font-size:1.62rem;margin:2.1em 0 .55em;padding-top:.35em;border-top:1px solid var(--line)}
.prose h2:first-of-type{border-top:0;margin-top:.4em;padding-top:0}
.prose h3{font-size:1.14rem;margin:1.7em 0 .4em}
.prose p{color:var(--ink-2)}
.prose ul,.prose ol{color:var(--ink-2)}
.prose table{margin:1.6em 0;font-size:.9rem}
.prose blockquote{margin:1.6em 0;padding:4px 0 4px 22px;border-left:2px solid var(--copper);color:var(--ink-2);font-family:var(--serif);font-size:1.1rem}
.prose img{margin:1.6em 0;border:1px solid var(--line)}
.prose code{background:var(--paper-2);padding:2px 5px;font-size:.9em}
.faq{margin:2.4em 0 0;border-top:1px solid var(--line-2)}
.faq .qa{padding:18px 0;border-bottom:1px solid var(--line)}
.faq .q{font-family:var(--serif);font-size:1.06rem;margin-bottom:6px}
.faq .a{color:var(--ink-2);font-size:.96rem}
.artfoot{margin-top:44px;padding-top:22px;border-top:1px solid var(--line-2);font-size:.86rem;color:var(--muted)}

/* ---------- index list (magazine style) ---------- */
.years{border-top:1px solid var(--ink)}
.post{display:grid;grid-template-columns:120px 1fr;gap:26px;padding:22px 0;border-bottom:1px solid var(--line);align-items:baseline}
.post .d{font-size:.78rem;letter-spacing:.06em;color:var(--muted);font-variant-numeric:tabular-nums}
.post .ti{font-family:var(--serif);font-size:1.24rem;line-height:1.3}
.post .ti a{color:var(--ink)}
.post .ti a:hover{color:var(--copper);text-decoration:none}
.post .de{font-size:.9rem;color:var(--muted);margin-top:6px;max-width:70ch}
.filters{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 26px}
.filters button{font-family:var(--sans);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;background:transparent;border:1px solid var(--line-2);color:var(--ink-2);padding:8px 14px;cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}

/* ---------- misc ---------- */
.two{display:grid;grid-template-columns:1fr 1fr;gap:44px}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
.stat{font-family:var(--serif);font-size:2.2rem;line-height:1;display:block}
.stat-l{font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-top:8px;display:block}
.center{text-align:center}
.mt0{margin-top:0}

@media (max-width:1040px){
  .menu{gap:14px}
  .menu a{font-size:.72rem}
  .brand i{display:none}
  .hero-in{grid-template-columns:1fr;gap:34px}
  .spec{padding-left:0;border-left:0;border-top:1px solid var(--line);padding-top:22px}
  .spec dl{grid-template-columns:repeat(3,1fr)}
  .article{grid-template-columns:1fr;gap:26px}
  .toc{position:static;border-bottom:1px solid var(--line);padding-bottom:18px}
  .toc ol{border-left:0;display:flex;flex-wrap:wrap;gap:4px 18px}
  .toc a{padding:4px 0}
}
@media (max-width:860px){
  .topbar-in{height:auto;padding:14px 20px;flex-wrap:wrap;row-gap:12px}
  .brand{flex:1 1 auto}
  .quote{padding:9px 14px;font-size:.7rem}
  .menu{order:3;flex:1 0 100%;margin-left:0;overflow-x:auto;gap:18px;padding-bottom:2px;-webkit-overflow-scrolling:touch}
  .menu a{font-size:.7rem}
  .wrap{padding:0 20px}
  .sec-head,.body{grid-template-columns:1fr;gap:14px}
  .sec-no{border-top:0;padding-top:0}
  .row{grid-template-columns:1fr;gap:8px;padding:20px 0}
  .two,.three,.split,.foot-grid{grid-template-columns:1fr}
  .foot-grid{gap:26px}
  .post{grid-template-columns:1fr;gap:6px;padding:20px 0}
  .form{grid-template-columns:1fr}
  .sec{padding:46px 0}
  .hero{padding:46px 0 40px}
  h1{font-size:2.1rem}
  .prose h2{font-size:1.4rem}
  table{font-size:.85rem}
  th,td{padding-right:8px}
  .spec dl{grid-template-columns:1fr 1fr}
}

/* ---------- small-screen refinements ---------- */
@media (max-width:520px){
  .topbar-in{padding:12px 16px;gap:10px}
  .brand b{font-size:1.06rem}
  .quote{padding:9px 12px;font-size:.66rem;letter-spacing:.06em}
  .menu{gap:14px;padding-bottom:4px}
  .menu a{font-size:.66rem;letter-spacing:.07em}
  .hero-actions{flex-direction:column;align-items:stretch;gap:10px}
  .hero-actions .btn{text-align:center;width:100%}
  .wrap{padding:0 16px}
  .phead h1{font-size:1.85rem}
  .spec dl{grid-template-columns:1fr}
}

/* ---------- small-screen refinements ---------- */
@media (max-width:520px){
  .topbar-in{padding:12px 16px;gap:10px}
  .brand b{font-size:1.06rem}
  .quote{padding:9px 12px;font-size:.66rem;letter-spacing:.06em}
  .menu{gap:14px;padding-bottom:4px}
  .menu a{font-size:.66rem;letter-spacing:.07em}
  .hero-actions{flex-direction:column;align-items:stretch;gap:10px}
  .hero-actions .btn{text-align:center;width:100%}
  .wrap{padding:0 16px}
  .phead h1{font-size:1.85rem}
  .spec dl{grid-template-columns:1fr}
}