/* ============================================================
   QuantTrade — 研究台
   A printed research note, not a dashboard.
   ============================================================ */

/* ── self-hosted editorial serif (subset, 579 glyphs) ── */
@font-face{
  font-family:"QT Serif";
  src:url("serif-400.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap;
}
@font-face{
  font-family:"QT Serif";
  src:url("serif-600.woff2") format("woff2");
  font-weight:600;font-style:normal;font-display:swap;
}

:root{
  --paper:#F5F2EA;
  --paper-2:#FAF8F2;
  --paper-3:#EFEBE0;
  --ink:#17160F;
  --ink-2:#3B3830;
  --muted:#6E695B;
  --faint:#9A9486;
  --rule:rgba(23,22,15,.13);
  --rule-2:rgba(23,22,15,.26);
  --claret:#A32A22;
  --jade:#2C6647;
  --brass:#9C7C3C;
  --serif:"QT Serif","Songti SC","SimSun","Noto Serif SC",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  --mono:"SF Mono","JetBrains Mono","Cascadia Mono",Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.68,.24,1);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

/* paper grain */
.grain{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  opacity:.22;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.42'/%3E%3C/svg%3E");
  mix-blend-mode:multiply;
}

main,header,footer{position:relative;z-index:1}

.wrap{width:min(1180px,calc(100% - 72px));margin:0 auto}

a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

::selection{background:rgba(156,124,60,.22)}

/* ─────────────────────────── masthead ─────────────────────────── */

.mast{
  position:sticky;top:0;z-index:40;
  background:rgba(245,242,234,.965);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--rule);
}
.mast-in{
  width:min(1180px,calc(100% - 72px));margin:0 auto;
  height:66px;display:flex;align-items:center;gap:34px;
}
.brand{display:flex;align-items:baseline;gap:9px;flex:0 0 auto}
.brand-mark{
  width:24px;height:24px;display:grid;place-items:center;
  background:var(--ink);color:var(--paper);
  font:600 13px/1 var(--serif);
  transform:translateY(3px);
}
.brand-word{
  font:600 13px/1 var(--mono);
  letter-spacing:.2em;
}
.brand-sub{
  font:400 11px/1 var(--sans);
  color:var(--muted);
  letter-spacing:.14em;
}

.mast-nav{display:flex;gap:22px;margin-left:8px}
.mast-nav a{
  font-size:12.5px;color:var(--muted);letter-spacing:.03em;
  padding:6px 0;position:relative;transition:color .25s var(--ease);
}
.mast-nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;
  background:var(--ink);transition:right .35s var(--ease);
}
.mast-nav a:hover{color:var(--ink)}
.mast-nav a:hover::after{right:0}

.mast-right{margin-left:auto;display:flex;align-items:center;gap:22px}

.seg{
  position:relative;display:flex;border:1px solid var(--rule-2);
  padding:3px;background:rgba(255,255,255,.35);
}
.seg button{
  position:relative;z-index:2;
  padding:5px 14px;font-size:12px;letter-spacing:.06em;color:var(--muted);
  transition:color .3s var(--ease);
}
.seg button[aria-selected="true"]{color:var(--paper)}
.seg-ink{
  position:absolute;top:3px;bottom:3px;left:3px;width:0;
  background:var(--ink);z-index:1;
  transition:transform .38s var(--ease),width .38s var(--ease);
}

.mast-date{
  display:flex;align-items:center;gap:8px;
  font:400 11px/1 var(--mono);color:var(--muted);letter-spacing:.04em;
  white-space:nowrap;
}
.mast-date b{font-weight:500;color:var(--ink-2)}
.pulse{
  width:5px;height:5px;border-radius:50%;background:var(--jade);
  box-shadow:0 0 0 0 rgba(44,102,71,.4);
  animation:pulse 2.6s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(44,102,71,.35)}
  60%{box-shadow:0 0 0 6px rgba(44,102,71,0)}
  100%{box-shadow:0 0 0 0 rgba(44,102,71,0)}
}

.mast-progress{position:absolute;left:0;right:0;bottom:-1px;height:1px}
.mast-progress i{display:block;height:100%;width:0;background:var(--ink);opacity:.35}

/* ─────────────────────────── hero ─────────────────────────── */

.hero{padding:104px 0 92px}
.hero-grid{
  display:grid;grid-template-columns:1.32fr .78fr;gap:78px;align-items:start;
}

.eyebrow{
  font:500 10.5px/1 var(--mono);
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--brass);margin:0 0 26px;
}
.hero h1{
  margin:0 0 30px;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(44px,5.5vw,80px);
  line-height:1.1;
  letter-spacing:-.015em;
}
.hero h1 .accent{color:var(--claret)}

.deck{
  margin:0 0 44px;max-width:34em;
  font-size:16.5px;line-height:1.95;color:var(--ink-2);
}

.hero-facts{
  list-style:none;margin:0;padding:20px 0 0;
  display:flex;gap:0;border-top:1px solid var(--rule);
}
.hero-facts li{
  flex:1;padding-right:18px;
}
.hero-facts li + li{border-left:1px solid var(--rule);padding-left:22px}
.hero-facts b{
  display:block;font:500 26px/1.1 var(--mono);letter-spacing:-.02em;
}
.hero-facts span{
  display:block;margin-top:7px;
  font:400 11px/1.4 var(--sans);color:var(--muted);letter-spacing:.06em;
}

/* ledger index */
.ledger-index{
  border:1px solid var(--rule);
  background:linear-gradient(180deg,rgba(255,255,255,.5),rgba(255,255,255,.12));
  padding:0 0 4px;
}
.li-head{
  display:flex;justify-content:space-between;align-items:baseline;
  padding:18px 22px 14px;border-bottom:1px solid var(--rule);
  font:500 11px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;
}
.li-head-en{color:var(--faint);letter-spacing:.14em;font-size:9.5px}

.li-row{
  width:100%;display:grid;grid-template-columns:1fr auto;gap:2px 14px;
  padding:17px 22px;text-align:left;border-bottom:1px solid var(--rule);
  transition:background .3s var(--ease);
}
.li-row:last-of-type{border-bottom:0}
.li-row:hover{background:rgba(255,255,255,.55)}
.li-name{
  display:flex;align-items:baseline;gap:8px;
  font-family:var(--serif);font-size:17px;letter-spacing:.02em;
}
.li-code{font:400 9.5px/1 var(--mono);color:var(--faint);letter-spacing:.1em}
.li-val{
  font:500 21px/1 var(--mono);letter-spacing:-.01em;text-align:right;
}
.li-sub{
  grid-column:1 / -1;display:flex;justify-content:space-between;align-items:center;
  font:400 10.5px/1.4 var(--mono);color:var(--muted);margin-top:7px;
}
.li-spark{width:88px;height:24px}
.li-foot{
  margin:0;padding:13px 22px 12px;border-top:1px solid var(--rule);
  font-size:11px;color:var(--faint);line-height:1.6;
}

.pos{color:var(--claret)}
.neg{color:var(--jade)}
.flat{color:var(--muted)}

/* ─────────────────────────── sections ─────────────────────────── */

.sect{padding:78px 0}
.sect-alt{background:rgba(255,255,255,.28);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.sect-ink{background:var(--ink);color:#F0EBDF;padding:96px 0 88px}
.sect-ink .sect-num{color:#C9A961}
.sect-ink .sect-deck{color:rgba(240,235,223,.58)}
.sect-ink .sect-meta{color:rgba(240,235,223,.45)}

.sect-head{
  display:grid;grid-template-columns:56px 1fr auto;gap:18px;
  align-items:start;padding-top:22px;border-top:1px solid var(--rule-2);
  margin-bottom:44px;
}
.sect-ink .sect-head{border-top-color:rgba(240,235,223,.22)}
.sect-num{
  font:500 10.5px/1.6 var(--mono);letter-spacing:.16em;color:var(--brass);
  padding-top:9px;
}
.sect-title h2{
  margin:0;font-family:var(--serif);font-weight:600;
  font-size:clamp(26px,3vw,36px);line-height:1.3;letter-spacing:-.01em;
}
.sect-deck{
  margin:12px 0 0;max-width:56ch;
  font-size:13.5px;line-height:1.85;color:var(--muted);
}
.sect-meta{
  display:flex;gap:10px;align-items:center;justify-content:flex-end;flex-wrap:wrap;
  font:400 10.5px/1.6 var(--mono);color:var(--muted);padding-top:9px;
  text-align:right;
}
.sect-tag{
  border:1px solid var(--rule-2);padding:2px 8px;letter-spacing:.08em;
}

/* ─────────────────────────── chart panel ─────────────────────────── */

.panel{
  border:1px solid var(--rule);
  background:var(--paper-2);
  padding:18px 22px 14px;
}
.panel-head{
  display:flex;justify-content:space-between;align-items:center;
  padding-bottom:10px;border-bottom:1px solid var(--rule);
}
.legend{display:flex;gap:22px}
.lg{
  display:flex;align-items:center;gap:8px;
  font:400 10.5px/1 var(--mono);color:var(--muted);letter-spacing:.04em;
}
.lg-line{width:20px;height:1.5px;background:var(--ink);display:block}
.lg-dash{
  width:20px;height:0;display:block;
  border-top:1.5px dashed var(--rule-2);
}
.range{display:flex;gap:4px}
.range button{
  font:400 10.5px/1 var(--mono);color:var(--faint);letter-spacing:.06em;
  padding:5px 9px;border:1px solid transparent;transition:.25s var(--ease);
}
.range button:hover{color:var(--ink)}
.range button.on{color:var(--ink);border-color:var(--rule-2)}

.chart{position:relative}
.nav-chart{height:352px;margin-top:12px}
.dd-chart{height:104px;margin-top:2px;border-top:1px solid var(--rule)}
.chart-foot{
  display:flex;justify-content:space-between;
  padding-top:10px;margin-top:6px;border-top:1px solid var(--rule);
  font:400 10px/1.5 var(--mono);color:var(--faint);letter-spacing:.05em;
}

svg{display:block;width:100%;height:100%;overflow:visible}
.ax{font:400 10px/1 var(--mono);fill:var(--faint);letter-spacing:.05em}
.gl{stroke:var(--rule);stroke-width:1;stroke-dasharray:2 5}
.axis-line{stroke:var(--rule-2);stroke-width:1}
.series-main{fill:none;stroke:var(--ink);stroke-width:1.6;stroke-linejoin:round;stroke-linecap:round}
.series-bench{fill:none;stroke:rgba(23,22,15,.46);stroke-width:1.2;stroke-dasharray:4 4}
.series-dd-line{fill:none;stroke:var(--jade);stroke-width:1.1}
.dd-area{fill:rgba(44,102,71,.13)}
.crosshair{stroke:var(--ink);stroke-width:1;stroke-dasharray:2 3;opacity:0}
.focus-dot{opacity:0}

/* tooltip */
.tip{
  position:absolute;z-index:6;pointer-events:none;
  background:var(--ink);color:#F3EEE1;
  padding:9px 11px;min-width:132px;
  font:400 10.5px/1.7 var(--mono);letter-spacing:.02em;
  opacity:0;transform:translate(-50%,-8%);transition:opacity .14s var(--ease);
  box-shadow:0 12px 30px rgba(23,22,15,.18);
}
.tip .t-date{color:#B9B19D;letter-spacing:.06em}
.tip .t-row{display:flex;justify-content:space-between;gap:14px}
.tip .t-row b{font-weight:500}

/* ─────────────────────────── KPIs ─────────────────────────── */

.kpis{
  display:grid;grid-template-columns:repeat(6,1fr);
  margin-top:-1px;border:1px solid var(--rule);border-top:0;
}
.kpi{padding:20px 20px 18px;border-left:1px solid var(--rule)}
.kpi:first-child{border-left:0}
.kpi-label{font:400 10px/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.kpi-value{margin-top:10px;font:500 25px/1.1 var(--mono);letter-spacing:-.02em}
.kpi-sub{margin-top:7px;font:400 10.5px/1.4 var(--mono);color:var(--muted)}

/* ─────────────────────────── reconcile ─────────────────────────── */

.recon-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:72px;align-items:start}

.recon-label{
  font:400 10.5px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);
}
.recon-big{
  margin:14px 0 20px;display:flex;align-items:baseline;gap:10px;
  font-family:var(--serif);font-weight:600;
  font-size:clamp(46px,5.2vw,72px);line-height:1;letter-spacing:-.02em;
}
.recon-big.flat{color:var(--ink)}
.rb-u{
  font-family:var(--mono);font-size:14px;font-weight:400;
  letter-spacing:.08em;color:var(--muted);
}
.recon-note{
  margin:0 0 34px;max-width:40ch;
  font-size:13.5px;line-height:1.95;color:var(--ink-2);
}
.recon-stats{
  display:grid;grid-template-columns:1fr 1fr;gap:0;
  margin:0;border-top:1px solid var(--rule);
}
.recon-stats div{
  padding:13px 0;border-bottom:1px solid var(--rule);
}
.recon-stats div:nth-child(even){padding-left:18px;border-left:1px solid var(--rule)}
.recon-stats dt{font:400 10px/1.4 var(--mono);letter-spacing:.1em;color:var(--faint);text-transform:uppercase}
.recon-stats dd{margin:6px 0 0;font:500 15px/1.2 var(--mono)}

.rb-head{
  display:flex;justify-content:space-between;
  padding-bottom:11px;border-bottom:1px solid var(--rule);
  font:400 10.5px/1 var(--mono);letter-spacing:.12em;color:var(--muted);
  text-transform:uppercase;
}
.rb-unit{color:var(--faint);letter-spacing:.06em}
.rb-foot{
  margin:18px 0 0;font-size:11.5px;line-height:1.8;color:var(--muted);
  max-width:46ch;
}
.rec-svg text{font-family:var(--mono)}
.rec-label{font-size:11px;fill:var(--ink-2);letter-spacing:.02em}
.rec-val{font-size:11px;fill:var(--ink);letter-spacing:.02em}
.rec-zero{stroke:var(--rule-2);stroke-width:1}

/* ─────────────────────────── tables ─────────────────────────── */

.book-grid{display:grid;grid-template-columns:1.6fr .75fr;gap:60px;align-items:start}

.table-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl thead th{
  text-align:left;padding:0 8px 10px;
  font:400 10px/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);border-bottom:1px solid var(--rule-2);white-space:nowrap;
}
.tbl th.num,.tbl td.num{text-align:right}
.tbl tbody td{
  padding:13px 8px;border-bottom:1px solid var(--rule);vertical-align:middle;
  font-family:var(--mono);font-size:12.5px;letter-spacing:-.01em;
}
.tbl tbody tr{transition:background .2s var(--ease)}
.tbl tbody tr:hover{background:rgba(255,255,255,.5)}
.sym{
  font-family:var(--sans);font-size:13px;font-weight:500;letter-spacing:.02em;
}
.w-col{width:110px}
.wbar{
  position:relative;height:4px;background:var(--paper-3);width:74px;margin-left:auto;
}
.wbar i{position:absolute;left:0;top:0;bottom:0;background:var(--ink);opacity:.68}

.rail{border-left:1px solid var(--rule);padding-left:30px}
.rail h4{
  margin:0 0 16px;font:400 10px/1.4 var(--mono);letter-spacing:.16em;
  text-transform:uppercase;color:var(--faint);
}
.rail dl{margin:0}
.rail .rrow{
  display:flex;justify-content:space-between;align-items:baseline;
  padding:11px 0;border-bottom:1px solid var(--rule);
}
.rail dt{font-size:12px;color:var(--muted)}
.rail dd{margin:0;font:500 14px/1 var(--mono)}
.rail-note{
  margin:22px 0 0;font-size:11.5px;line-height:1.8;color:var(--muted);
}

/* side chip */
.chip{
  display:inline-block;padding:1px 7px;border:1px solid currentColor;
  font:400 10px/1.6 var(--mono);letter-spacing:.1em;
}
.chip.buy{color:var(--claret)}
.chip.sell{color:var(--jade)}

.exec-strip{
  display:grid;grid-template-columns:repeat(4,1fr);
  margin-top:26px;border-top:1px solid var(--rule-2);
}
.exec-strip div{padding:18px 18px 16px;border-left:1px solid var(--rule)}
.exec-strip div:first-child{border-left:0;padding-left:0}
.exec-strip span{display:block;font:400 10px/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}
.exec-strip b{display:block;margin-top:8px;font:500 20px/1 var(--mono)}

/* ─────────────────────────── research ─────────────────────────── */

.research-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:62px;align-items:start}

.mini-head{
  display:flex;justify-content:space-between;align-items:baseline;
  padding-bottom:10px;border-bottom:1px solid var(--rule-2);
  font:400 10.5px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);
}
.mini-unit{color:var(--faint);letter-spacing:.05em;text-transform:none}

#heatmap{margin-top:16px}
.expo-chart{height:132px;margin-top:8px}
.heat-grid{
  display:grid;grid-template-columns:46px repeat(12,1fr) 58px;gap:3px;
}
.heat-y{
  font:400 10px/1 var(--mono);color:var(--faint);
  display:flex;align-items:center;
}
.heat-m{
  font:400 9px/1 var(--mono);color:var(--faint);text-align:center;
  padding-bottom:2px;
}
.heat-cell{
  height:36px;display:grid;place-items:center;
  font:400 10px/1 var(--mono);letter-spacing:-.02em;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease);
}
.heat-total{
  box-shadow:inset 1px 0 0 var(--rule-2);
  font-weight:500;
}
.heat-yh{text-align:right;padding-right:6px}
.heat-cell:hover{transform:scale(1.08);box-shadow:0 4px 12px rgba(23,22,15,.14);z-index:2}
.heat-legend{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px 22px;margin-top:18px;padding-top:14px;
  border-top:1px solid var(--rule);
  font:400 10px/1 var(--mono);color:var(--faint);letter-spacing:.04em;
}
.heat-legend b{color:var(--ink);font-weight:500;font-size:12px}
.hl-item i{font-style:normal;color:var(--faint);margin-right:7px}
.hl-scale{margin-left:auto;display:flex;align-items:center;gap:6px;color:var(--faint)}
.sw{width:9px;height:9px;display:block;margin-left:6px}
.sw.neg{background:rgba(44,102,71,.62)}
.sw.mid{background:rgba(23,22,15,.07);box-shadow:inset 0 0 0 1px var(--rule)}
.sw.pos{background:rgba(163,42,34,.62)}

.score-list{margin-top:6px}
.score-row{
  display:grid;grid-template-columns:24px 62px 1fr 48px;gap:10px;align-items:center;
  padding:9px 0;border-bottom:1px solid var(--rule);
}
.score-rank{font:400 9.5px/1 var(--mono);color:var(--faint);letter-spacing:.06em}
.score-sym{font:500 12px/1 var(--sans);letter-spacing:.02em}
.score-track{height:14px;position:relative}
.score-track::before{content:"";position:absolute;left:0;right:0;top:50%;height:1px;background:var(--rule)}

.score-track b{position:absolute;top:50%;width:6px;height:6px;border-radius:50%;background:var(--ink);transform:translate(-50%,-50%);box-shadow:0 0 0 3px var(--paper)}
.score-axis{display:flex;justify-content:space-between;margin-left:96px;margin-top:10px;
  font:400 9.5px/1 var(--mono);color:var(--faint);letter-spacing:.06em}

.score-val{text-align:right;font:400 11px/1 var(--mono);color:var(--muted)}

/* ─────────────────────────── method ─────────────────────────── */

.rules{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:1fr 1fr;gap:0 64px;
  counter-reset:r;
}
.rules li{
  counter-increment:r;position:relative;
  padding:22px 0 24px 40px;border-top:1px solid rgba(240,235,223,.16);
}
.rules li::before{
  content:counter(r,decimal-leading-zero);
  position:absolute;left:0;top:24px;
  font:400 10px/1 var(--mono);letter-spacing:.1em;color:#C9A961;
}
.rules h3{
  margin:0 0 8px;font-family:var(--serif);font-weight:600;
  font-size:18px;line-height:1.5;letter-spacing:.01em;
}
.rules p{
  margin:0;font-size:12.5px;line-height:1.85;color:rgba(240,235,223,.68);
}

.limits{margin-top:64px;padding-top:22px;border-top:1px solid rgba(240,235,223,.22)}
.limits h3{
  margin:0 0 24px;font:400 10.5px/1 var(--mono);
  letter-spacing:.18em;text-transform:uppercase;color:#C9A961;
}
.limits-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 64px}
.limits-grid p{
  margin:0;padding:16px 0;border-top:1px solid rgba(240,235,223,.12);
  font-size:12.5px;line-height:1.85;color:rgba(240,235,223,.68);
}
.limits-grid b{color:#F0EBDF;font-weight:500}

/* ─────────────────────────── footer ─────────────────────────── */

.foot{padding:74px 0 34px;background:var(--paper)}
.foot-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;
  padding-bottom:40px;border-bottom:1px solid var(--rule);
}
.foot-brand{font:500 11px/1 var(--mono);letter-spacing:.2em;margin-bottom:14px}
.foot-line{font-size:12.5px;line-height:1.8;color:var(--muted);max-width:30ch}
.foot h4{
  margin:0 0 12px;font:400 9.5px/1 var(--mono);
  letter-spacing:.16em;text-transform:uppercase;color:var(--faint);
}
.foot p{margin:0 0 10px;font-size:11.5px;line-height:1.8;color:var(--muted);max-width:34ch}
.foot-base{
  display:flex;gap:26px;justify-content:space-between;
  padding-top:18px;font:400 9.5px/1.6 var(--mono);color:var(--faint);letter-spacing:.06em;
}

/* ─────────────────────────── pipeline ─────────────────────────── */

.flow{
  display:grid;grid-template-columns:repeat(8,minmax(0,1fr));
  border-top:1px solid var(--rule-2);border-bottom:1px solid var(--rule-2);
}
.flow-i{
  position:relative;width:100%;text-align:left;padding:16px 14px 20px;
  border-left:1px solid var(--rule);transition:background .3s var(--ease);
}
.flow-i:first-child{border-left:0}
.flow-i::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:var(--brass);transform:scaleX(0);transform-origin:left;
  transition:transform .45s var(--ease);
}
.flow-i:hover{background:rgba(156,124,60,.06)}
.flow-i:hover::after,.flow-i.on::after{transform:scaleX(1)}
.fi-no{display:block;font:500 9.5px/1 var(--mono);letter-spacing:.16em;color:var(--brass)}
.fi-name{display:block;margin-top:9px;font:600 14px/1.3 var(--serif)}
.fi-val{display:block;margin-top:8px;font:400 10.5px/1.5 var(--mono);color:var(--muted)}

.stages{display:flex;flex-direction:column;margin-top:60px}
.stage{display:grid;grid-template-columns:56px minmax(0,1fr);gap:18px}
.st-rail{display:flex;flex-direction:column;align-items:flex-start}
.st-no{font:500 10.5px/1 var(--mono);letter-spacing:.16em;color:var(--brass);padding-top:6px}
.st-rail i{width:1px;flex:1;background:var(--rule);margin:14px 0 0 4px}
.stage:last-child .st-rail i{display:none}
.st-body{padding-bottom:68px;min-width:0}
.stage:last-child .st-body{padding-bottom:0}

.st-head{
  display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;
  padding-bottom:12px;border-bottom:1px solid var(--rule);
}
.st-head h3{margin:0;font:600 20px/1.3 var(--serif);letter-spacing:-.005em}
.st-en{font:400 9.5px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--faint)}
.st-io{margin-left:auto;font:400 10.5px/1.5 var(--mono);color:var(--muted);max-width:100%}

.st-facts{display:flex;flex-wrap:wrap;gap:8px clamp(20px,3.4vw,48px);padding:20px 0 2px}
.st-facts div{display:flex;flex-direction:column;gap:5px}
.st-facts b{font:600 21px/1.05 var(--serif);letter-spacing:-.015em;white-space:nowrap}
.st-facts b small{font:400 11px/1 var(--mono);letter-spacing:0;color:var(--muted);margin-left:2px}
.st-facts span{font:400 9.5px/1 var(--mono);letter-spacing:.08em;color:var(--muted)}

.st-viz{margin-top:18px;border:1px solid var(--rule);background:var(--paper-2);padding:18px 20px 14px}
.st-viz svg{display:block;width:100%;height:auto;overflow:visible}
.st-viz .ax{font:400 9px/1 var(--mono);fill:var(--faint);letter-spacing:.02em}
.viz-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:10px}
.viz-head span:first-child{font:400 9.5px/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.viz-head span:last-child{font:400 10px/1.4 var(--mono);color:var(--muted);text-align:right}

.st-note{margin:18px 0 0;max-width:62ch;padding-left:14px;border-left:2px solid var(--brass);font-size:12.5px;line-height:1.85;color:var(--muted)}
.st-note b{display:block;margin-bottom:6px;font:500 9.5px/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2)}

.pipe-foot{
  margin:56px 0 0;padding-top:18px;border-top:1px solid var(--rule);
  font:400 10.5px/1.9 var(--mono);color:var(--faint);max-width:74ch;
}

/* ─────────────────────────── motion ─────────────────────────── */

.reveal{opacity:0;transform:translateY(16px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}

.draw{stroke-dasharray:1;stroke-dashoffset:1;animation:draw 1.1s var(--ease) forwards}
@keyframes draw{to{stroke-dashoffset:0}}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .draw{animation:none;stroke-dasharray:none;stroke-dashoffset:0}
  .pulse{animation:none}
}

/* ─────────────────────────── responsive ─────────────────────────── */

@media (max-width:1120px){
  .mast-nav{display:none}
  .wrap,.mast-in{width:calc(100% - 48px)}
  .hero-grid{grid-template-columns:1fr;gap:52px}
  .recon-grid,.book-grid,.research-grid{grid-template-columns:1fr;gap:44px}
  .rail{border-left:0;padding-left:0;border-top:1px solid var(--rule);padding-top:20px}
  .kpis{grid-template-columns:repeat(3,1fr)}
  .kpi:nth-child(4){border-left:0}
  .foot-grid{grid-template-columns:1fr 1fr;gap:34px}
  .flow{grid-template-columns:repeat(4,minmax(0,1fr))}
  .flow-i:nth-child(4n+1){border-left:0}
  .flow-i:nth-child(n+5){border-top:1px solid var(--rule)}
}

@media (max-width:720px){
  body{font-size:14px}
  .wrap,.mast-in{width:calc(100% - 32px)}
  .mast-in{height:58px;gap:12px}
  .brand-sub{display:none}
  .mast-date{display:none}
  .seg button{padding:5px 10px;font-size:11px}
  .hero{padding:64px 0 56px}
  .hero h1{font-size:38px}
  .deck{font-size:15px;line-height:1.9}
  .hero-facts{flex-wrap:wrap;gap:14px 0}
  .hero-facts li{flex:1 1 50%}
  .hero-facts li:nth-child(3){border-left:0;padding-left:0}
  .sect{padding:64px 0}
  .sect-head{grid-template-columns:1fr;gap:10px}
  .sect-num{padding-top:0}
  .sect-meta{justify-content:flex-start;text-align:left;padding-top:0}
  .kpis{grid-template-columns:1fr 1fr}
  .kpi:nth-child(odd){border-left:0}
  .kpi:nth-child(n+3){border-top:1px solid var(--rule)}
  .nav-chart{height:260px}
  .dd-chart{height:70px}
  .wbar{display:none}
  .heat-cell{height:26px;font-size:8.5px}
  .heat-grid{grid-template-columns:30px repeat(12,1fr) 44px;gap:2px}
  .exec-strip{grid-template-columns:1fr 1fr}
  .exec-strip div:nth-child(3){border-left:0;padding-left:0}
  .rules,.limits-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .foot-base{flex-direction:column;gap:6px}
  .recon-stats{grid-template-columns:1fr}
  .recon-stats div:nth-child(even){padding-left:0;border-left:0}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr))}
  .flow-i:nth-child(odd){border-left:0}
  .flow-i:nth-child(n+3){border-top:1px solid var(--rule)}
  .flow-i{padding:13px 12px 15px}
  .fi-name{font-size:13px}
  .stage{grid-template-columns:1fr;gap:0}
  .st-rail{flex-direction:row;align-items:center;gap:10px}
  .st-rail i{display:none}
  .st-no{padding-top:0}
  .st-body{padding-bottom:46px;padding-top:4px}
  .st-head h3{font-size:18px}
  .st-io{margin-left:0;width:100%;font-size:10px}
  .st-facts{gap:14px 26px}
  .st-facts b{font-size:18px}
  /* 680-wide coordinate systems are unreadable at 340px. Scroll instead of shrink. */
  .st-viz{padding:14px 12px 10px;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .st-viz svg{min-width:520px}
  .viz-head{position:sticky;left:0;z-index:2;background:var(--paper-2)}
  .viz-head{flex-direction:column;gap:3px}
  .viz-head span:last-child{text-align:left}
  .pipe-foot{margin-top:36px}
}