:root{
  --bg:#12140f; --panel:#21251b; --ink:#efe6d4;
  --muted:#9a917f; --faint:#6d6758; --line:#3a382c;
  --copper:#c9893a; --copper2:#e3b56a; --sage:#8aa375; --rose:#c56b58; --teal:#6ea8a0;
  --prose:720px; --wide:1000px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family:"Source Sans 3",system-ui,sans-serif;font-size:18px;line-height:1.7;}
body{
  background-image:
    radial-gradient(ellipse at 10% -10%, #2a2618 0%, transparent 42%),
    radial-gradient(ellipse at 110% 10%, #1a2420 0%, transparent 40%);
}
a{color:var(--copper2)}
a:hover{color:#f0d19a}
.mast,.prose,footer.pager{max-width:var(--prose);margin:0 auto;padding:0 22px}
.mast{padding:36px 22px 18px}
.kicker{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--copper);margin:0 0 14px}
h1{font-family:"Cormorant Garamond",Georgia,serif;font-weight:600;font-size:42px;
  line-height:1.08;margin:0 0 12px}
.authors{color:var(--muted);font-size:14.5px;margin:0 0 8px}
.topnav{
  position:sticky;top:0;z-index:20;
  background:rgba(18,20,15,.92);backdrop-filter:blur(10px);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.topnav .inner{max-width:var(--wide);margin:0 auto;padding:10px 22px;
  display:flex;gap:4px 18px;flex-wrap:wrap;align-items:baseline}
.topnav a{color:var(--muted);text-decoration:none;font-size:15px;padding:2px 0;
  border-bottom:2px solid transparent}
.topnav a:hover{color:var(--ink)}
.topnav a.on{color:#f3ead8;border-bottom-color:var(--copper)}
.topnav .mark{font-family:"IBM Plex Mono",monospace;font-size:10px;
  letter-spacing:.12em;text-transform:uppercase;color:var(--faint);margin-right:8px}
section{max-width:var(--wide);margin:40px auto 0;padding:0 22px}
section .prose,section > h2,section > p{max-width:var(--prose)}
h2{font-family:"Cormorant Garamond",Georgia,serif;font-weight:600;
  font-size:28px;line-height:1.25;margin:0 0 14px;color:#f3ead8;font-style:italic}
p{margin:0 0 14px;color:#e7decc}
p.aside{color:var(--muted);font-size:15.5px}
p.lede{font-family:"Cormorant Garamond",Georgia,serif;font-size:22px;
  line-height:1.45;font-style:italic;color:#f3ead8;margin:8px 0 18px}
.cite{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--faint);
  letter-spacing:.04em}
.argue{
  max-width:var(--prose);
  display:grid;grid-template-columns:auto 1fr;gap:0 14px;
  border:1px solid var(--line);background:#1a1c14;
  padding:10px 12px 10px 0;margin:0 0 20px;
  font-size:14.5px;line-height:1.45;color:#d9d0bc;
}
.argue-k{
  writing-mode:vertical-rl;transform:rotate(180deg);
  font-family:"IBM Plex Mono",monospace;font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--copper2);
  padding:0 8px;border-right:3px solid var(--copper);
}
.argue ol{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.argue li{display:grid;grid-template-columns:3.2em 1fr;gap:8px}
.argue li i{font-style:normal;font-family:"IBM Plex Mono",monospace;
  font-size:11px;color:var(--sage);letter-spacing:.06em}
.map{list-style:none;margin:8px 0 20px;padding:0;max-width:var(--prose)}
.map li{margin:0 0 14px;padding:12px 14px;background:var(--panel);border:1px solid var(--line)}
.map a{text-decoration:none}
.map .who{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--sage)}
.map p{margin:6px 0 0;font-size:15.5px;color:#d9d0bc}
.flow{font-family:"IBM Plex Mono",monospace;font-size:12.5px;color:var(--teal);
  background:#12140f;border:1px solid var(--line);padding:12px 14px;margin:8px 0 16px;
  overflow-x:auto;line-height:1.65;white-space:pre;max-width:var(--wide)}
.stage{background:#161910;border:1px solid var(--line);padding:16px 16px 12px;margin:12px 0 20px;
  max-width:var(--wide)}
.stage .toy-note{border:1px dashed #5a5340;padding:8px 10px;font-size:13px;color:var(--muted);
  margin-bottom:12px;background:#1a1c14;line-height:1.5}
canvas{display:block;width:100%;background:#0e100c;border:1px solid var(--line)}
.heat-meta{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;
  font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--faint);margin-top:6px}
.legend{display:flex;gap:10px;align-items:center;font-size:12px;color:var(--muted);margin-top:6px}
.sw{width:72px;height:8px;background:linear-gradient(90deg,#1b2430,#c9893a,#f3e2b0)}
.ctrl{margin:10px 0 4px}
.ctrl label{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}
.ctrl label b{color:var(--ink);font-family:"IBM Plex Mono",monospace;font-weight:500}
input[type=range]{width:100%;accent-color:var(--copper)}
.formula{font-family:"IBM Plex Mono",monospace;font-size:13.5px;color:var(--copper2);
  background:var(--panel);border:1px solid var(--line);padding:12px 14px;margin:12px 0 16px;
  overflow-x:auto;line-height:1.55;max-width:var(--prose)}
table.board{width:100%;border-collapse:collapse;font-size:14.5px;max-width:var(--wide)}
table.board th{text-align:left;color:var(--muted);font-size:12px;border-bottom:1px solid var(--line);padding:7px 6px}
table.board td{padding:8px 6px;border-bottom:1px solid #2c2a22;vertical-align:top}
table.board td.num{font-family:"IBM Plex Mono",monospace;color:var(--copper2);white-space:nowrap}
table.board tr.hero td{background:#2a2618}
.flag{border-left:3px solid var(--rose);padding:10px 14px;background:#1c1612;margin:16px 0;
  color:#e8d4c8;font-size:16px;max-width:var(--prose)}
.path-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin:16px 0 8px;max-width:var(--wide)}
.path{background:var(--panel);border:1px solid var(--line);padding:12px 14px}
.path .who{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--sage);letter-spacing:.08em;text-transform:uppercase}
.path .val{font-family:"Cormorant Garamond",Georgia,serif;font-size:26px;margin:4px 0}
.path p{margin:0;font-size:14px;color:var(--muted);line-height:1.45}
footer.pager{margin:64px auto 0;padding:22px 22px 48px;border-top:1px solid var(--line);
  color:var(--muted);font-size:13.5px}
.turn{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:0 0 18px}
.turn a{text-decoration:none;border:1px solid var(--line);padding:8px 12px;color:var(--copper2)}
.turn a:hover{border-color:var(--copper);color:#f0d19a}
.turn .ghost{border-color:transparent;color:var(--faint);pointer-events:none}
.pill{display:inline-block;border:1px solid var(--line);padding:1px 7px;margin-right:6px;
  font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--copper2)}
button.term{
  display:inline;padding:0;margin:0;border:0;background:none;
  font:inherit;color:var(--copper2);
  border-bottom:1px dotted var(--copper);
  cursor:pointer;border-radius:0;line-height:inherit;
}
button.term:hover,button.term:focus-visible{
  color:#f0d19a;border-bottom-style:solid;outline:none;
}
.term-back{position:fixed;inset:0;background:rgba(8,9,6,.5);z-index:40}
.term-plate{
  position:fixed;left:50%;bottom:20px;transform:translateX(-50%);
  width:min(640px,calc(100vw - 28px));
  background:#1c1a14;color:var(--ink);
  border:1px solid #5a4a2c;border-top:3px solid var(--copper);
  padding:14px 18px 16px;z-index:41;
  box-shadow:0 16px 48px rgba(0,0,0,.45);
  font-size:15px;line-height:1.6;
}
.term-plate[hidden],.term-back[hidden]{display:none}
.term-kicker{font-family:"IBM Plex Mono",monospace;font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--copper);margin:0 0 6px}
.term-plate h3{font-family:"Cormorant Garamond",Georgia,serif;font-weight:600;
  font-size:22px;font-style:italic;margin:0 0 8px;color:#f3ead8}
.term-plate .bg{margin:0 0 10px;color:#e7decc}
.term-plate .use{margin:0 0 8px;color:var(--muted);
  border-top:1px dashed var(--line);padding-top:8px}
.term-plate .use::before{content:"本篇用法 · ";color:var(--sage);
  font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.06em}
.term-x{position:absolute;top:8px;right:10px;border:0;background:none;
  color:var(--muted);font-size:20px;line-height:1;cursor:pointer;font-family:Georgia,serif}
.term-x:hover,.term-x:focus-visible{color:var(--ink);outline:none}
@media (max-width:720px){
  h1{font-size:34px} .path-grid{grid-template-columns:1fr}
  body{font-size:17px}
  .argue{grid-template-columns:1fr;padding:10px 12px}
  .argue-k{writing-mode:horizontal-tb;transform:none;border-right:0;
    border-bottom:2px solid var(--copper);padding:0 0 6px}
}
.pair-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0;max-width:var(--wide)}
.pair-card{background:var(--panel);border:1px solid var(--line);padding:14px 16px}
.pair-card .who{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--sage)}
.pair-card .delta{color:var(--rose);font-family:"IBM Plex Mono",monospace;font-size:13px}
.pair-card p{margin:6px 0 0;font-size:14.5px;color:#d9d0bc}
.dim-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin:16px 0;max-width:var(--wide)}
.steps{max-width:var(--prose);margin:8px 0 20px;padding:0;list-style:none}
.steps li{margin:0 0 12px;padding:12px 14px;background:var(--panel);border:1px solid var(--line)}
.steps .n{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--copper);display:block;margin-bottom:4px}
.steps p{margin:0;font-size:15.5px;color:#d9d0bc}
.table-wrap{overflow-x:auto;max-width:var(--wide);margin:12px 0 20px}
table.board.tight{font-size:13px}
table.board.tight td,table.board.tight th{padding:6px 5px}
.same{border-left:3px solid var(--teal);padding:10px 14px;background:#141816;margin:16px 0;
  color:#d4e0dc;font-size:15.5px;max-width:var(--prose)}
@media (max-width:720px){
  .pair-grid,.dim-grid{grid-template-columns:1fr}
}

.site-nav{position:sticky;top:0;z-index:80;background:#1c1914;color:#f4efe6;
  font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px;
  display:flex;flex-wrap:wrap;gap:14px 18px;align-items:center;padding:10px 22px}
.site-nav a{color:#f4efe6;text-decoration:none;opacity:.82}
.site-nav a:hover,.site-nav a.on{opacity:1;border-bottom:1px solid #f4efe6}
.site-nav .brand{font-weight:700;letter-spacing:.12em;margin-right:6px}
.subnav{padding:10px 22px 8px;display:flex;flex-wrap:wrap;gap:8px 10px;
  font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px}
.subnav a{color:#efe6d4;text-decoration:none;border:1px solid #3a382c;
  background:#21251b;padding:5px 10px;border-radius:999px}
.subnav a.on{background:#f4efe6;color:#1c1914;border-color:#f4efe6}