:root{
  --bg:#ffffff;
  --ink:#1d2b33;
  --body:#2c3a42;
  --muted:#5f707a;
  --line:#e2e8ea;
  --panel:#f5f8f8;
  --teal:#1f5d6e;
  --teal-deep:#143f4d;
  --bronze:#a9682f;
  --table-head:#edf2f3;
  --maxw:880px;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0; background:var(--bg); color:var(--body);
  font-family:"Source Sans 3","Segoe UI",-apple-system,BlinkMacSystemFont,sans-serif;
  font-size:16px; line-height:1.75;
}
img{max-width:100%;display:block;}
a{color:var(--teal);}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ---------- Contact bar ---------- */
.contact-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--bronze);padding:12px 16px;margin-bottom:22px;font-size:15.5px;color:var(--ink);}
.contact-bar svg{flex:0 0 auto;color:var(--bronze);}
.contact-bar a{color:var(--teal);font-weight:600;text-decoration:none;}
.contact-bar a:hover{text-decoration:underline;}
.contact-bar .contact-cn{color:var(--muted);font-size:14.5px;}
.contact-bar.bottom{margin:36px 0 0;}

/* ---------- Hero ---------- */
.hero{border-bottom:1px solid var(--line);}
.hero-inner{padding-block:56px 40px;}
.kicker{font-family:"IBM Plex Mono",monospace;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--bronze);margin:0 0 18px;}
h1{font-family:Archivo,"Source Sans 3",sans-serif;font-weight:800;color:var(--ink);font-size:36px;line-height:1.2;margin:0 0 18px;letter-spacing:-.01em;}
.lede{font-size:18px;color:var(--muted);max-width:720px;margin:0 0 28px;}
.meta-row{display:flex;flex-wrap:wrap;gap:24px;font-family:"IBM Plex Mono",monospace;font-size:13px;color:var(--muted);}
.meta-row b{color:var(--teal-deep);font-weight:500;}
.stat-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:34px;}
.stat{border:1px solid var(--line);border-left:3px solid var(--teal);padding:16px 18px;background:var(--panel);}
.stat .num{font-family:Archivo,sans-serif;font-weight:700;font-size:26px;color:var(--teal-deep);display:block;}
.stat .lbl{font-size:14px;color:var(--muted);}

/* ---------- TOC ---------- */
.toc{border:1px solid var(--line);background:var(--panel);padding:22px 26px;margin:36px 0 8px;}
.toc h2{font-size:15px;font-family:"IBM Plex Mono",monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--teal-deep);margin:0 0 12px;}
.toc ol{margin:0;padding-left:0;list-style:none;counter-reset:toc;}
.toc li{counter-increment:toc;padding:7px 0;border-top:1px solid var(--line);}
.toc li:first-child{border-top:none;}
.toc a{text-decoration:none;color:var(--body);display:flex;gap:14px;}
.toc a::before{content:counter(toc,decimal-leading-zero);font-family:"IBM Plex Mono",monospace;color:var(--bronze);font-size:13px;min-width:34px;}
.toc a:hover{color:var(--teal);}

/* ---------- Sections ---------- */
section{padding:48px 0 8px;}
.sec-head{display:flex;align-items:baseline;gap:18px;border-bottom:2px solid var(--teal-deep);padding-bottom:14px;margin-bottom:26px;}
.sec-num{font-family:"IBM Plex Mono",monospace;font-size:15px;color:var(--bronze);}
h2{font-family:Archivo,sans-serif;font-weight:700;font-size:27px;color:var(--ink);margin:0;letter-spacing:-.01em;}
h3{font-family:Archivo,sans-serif;font-weight:700;font-size:19px;color:var(--teal-deep);margin:34px 0 12px;}
h4{font-size:16px;font-weight:700;color:var(--ink);margin:20px 0 8px;}
p{margin:0 0 14px;}
ul,ol{margin:0 0 16px;padding-left:22px;}
li{margin-bottom:6px;}
strong{color:var(--ink);}

/* ---------- Callout ---------- */
.note{border:1px solid var(--line);border-left:3px solid var(--bronze);background:#fbf6f0;padding:16px 20px;margin:20px 0;font-size:15.5px;}
.note .tag{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--bronze);display:block;margin-bottom:6px;}

/* ---------- Tables ---------- */
.table-scroll{overflow-x:auto;margin:18px 0 22px;-webkit-overflow-scrolling:touch;}
table{width:100%;min-width:620px;border-collapse:collapse;font-size:15px;table-layout:fixed;}
th,td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);}
th{background:var(--table-head);color:var(--teal-deep);font-weight:600;font-size:14.5px;}
td .mono,.mono{font-family:"IBM Plex Mono",monospace;font-size:14px;}

/* ---------- Flow ---------- */
.flow{display:grid;grid-template-columns:repeat(6,1fr);gap:0;margin:24px 0;}
.flow .step{padding:14px 12px;border-top:3px solid var(--teal);background:var(--panel);text-align:center;}
.flow .step .s-n{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--bronze);display:block;}
.flow .step .s-t{font-weight:600;color:var(--teal-deep);font-size:14.5px;display:block;margin-top:4px;}
.flow .step .s-d{font-size:13px;color:var(--muted);display:block;margin-top:4px;}

/* ---------- Gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:20px 0;}
.card{border:1px solid var(--line);background:#fff;}
.card .ph{aspect-ratio:4/3;overflow:hidden;}
.card .ph img{width:100%;height:100%;object-fit:cover;}
.card .cap{padding:10px 12px;font-family:"IBM Plex Mono",monospace;font-size:12.5px;line-height:1.7;color:var(--muted);border-top:1px solid var(--line);}
.card .cap b{color:var(--ink);font-weight:500;}
.gallery-group h3{margin-top:30px;}
.group-desc{font-size:15px;color:var(--muted);margin:-6px 0 14px;}

/* ---------- Chart ---------- */
.chart-box{border:1px solid var(--line);padding:18px 18px 8px;margin:22px 0;}
.chart-box .ct{font-family:Archivo,sans-serif;font-weight:700;font-size:16px;color:var(--ink);margin:0 0 4px;}
.chart-box .cs{font-size:14px;color:var(--muted);margin:0 0 8px;}
#lifeChart{width:100%;height:320px;}

/* ---------- Footer ---------- */
footer{margin-top:60px;border-top:1px solid var(--line);padding:30px 0 50px;color:var(--muted);font-size:14px;}

@media (max-width:768px){
  h1{font-size:28px;}
  h2{font-size:22px;}
  .stat-strip{grid-template-columns:1fr;}
  .flow{grid-template-columns:1fr;}
  .gallery{grid-template-columns:repeat(2,1fr);}
  .methods-table{min-width:0;}
  .methods-table thead{display:none;}
  .methods-table,.methods-table tbody,.methods-table tr,.methods-table td{display:block;width:auto;}
  .methods-table tr{border:1px solid var(--line);background:var(--panel);padding:10px 14px;margin-bottom:14px;}
  .methods-table td{border-bottom:1px solid var(--line);padding:8px 0;}
  .methods-table td:last-child{border-bottom:none;}
  .methods-table td::before{content:attr(data-label);display:block;font-weight:700;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--bronze);margin-bottom:2px;}
}
@media (max-width:420px){
  .gallery{grid-template-columns:1fr;}
}