:root{
  --ink:#0A1A2A;
  --deck:#102A3F;
  --steel:#1E4059;
  --orange:#FF6A1A;
  --amber:#FF8F4D;
  --jade:#4FD1A5;
  --cream:#F4EDDF;
  --brown:#241C14;
  --mist:#93A7B8;
  --dim:#6C8296;
  --gold:#E0A93B;
  --text:#C9D8E4;
  --rail-w:240px;
  --bar-h:56px;
  --maxw:1280px;
  --gutter:28px;
  --dur:.16s;
  --font-display:"Barlow Condensed","Archivo Narrow","Oswald","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:961px){ body{padding-left:var(--rail-w)} }

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.02em;
  color:var(--cream);
  margin:0 0 .5em;
}
h1{font-size:clamp(40px,5vw,88px)}
h2{font-size:clamp(28px,3vw,40px)}
h3{font-size:clamp(20px,1.8vw,28px)}
h4{font-size:17px;letter-spacing:.01em;font-weight:700}
p{margin:0 0 1.1em}
a{color:inherit}
img{max-width:100%;display:block}
ul,ol{margin:0 0 1.1em}
button{font-family:inherit}
main{display:block}
#main-content{scroll-margin-top:calc(var(--bar-h) + 16px);outline:none}
:focus-visible{outline:2px solid var(--jade);outline-offset:2px}

.mono,.u-mono,.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.stack>*+*{margin-top:14px}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:10px;top:-120px;z-index:200;
  background:var(--orange);color:#1A0E05;
  padding:10px 18px;text-decoration:none;
  font-family:var(--font-display);font-weight:800;font-size:15px;letter-spacing:.06em;
  transition:top .16s linear;
}
.skip-link:focus{top:10px}

/* ---------- header shell ---------- */
.site-header{position:relative;z-index:80}

.cmd{
  position:sticky;top:0;z-index:60;
  background:var(--deck);
  border-bottom:1px solid var(--steel);
  box-shadow:0 1px 0 rgba(0,0,0,.35);
}
.cmd__inner{
  display:flex;align-items:center;gap:16px;
  height:var(--bar-h);
  padding:0 20px;
  min-width:0;
}
.cmd__progress{
  position:absolute;left:0;bottom:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--orange),var(--amber));
  transition:width .08s linear;
  pointer-events:none;
}

/* brand */
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto;min-width:0}
.brand__mark{
  display:inline-grid;place-items:center;width:30px;height:30px;
  background:var(--orange);color:#1A0E05;
  font-family:var(--font-display);font-weight:900;font-size:14px;letter-spacing:.04em;
  clip-path:polygon(0 0,100% 0,calc(100% - 8px) 100%,0 100%);
}
.brand__name{
  font-family:var(--font-display);font-weight:800;font-size:19px;
  letter-spacing:.05em;color:var(--cream);white-space:nowrap;
}
.brand__status{
  display:inline-flex;align-items:center;gap:7px;
  padding-left:12px;border-left:1px solid var(--steel);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--mist);
  white-space:nowrap;
}
.status-dot{
  display:inline-block;width:7px;height:7px;border-radius:50%;
  background:var(--jade);
  box-shadow:0 0 0 2px rgba(79,209,165,.14);
  animation:dotPulse 2.4s ease-in-out infinite;
  flex:0 0 auto;
}
@keyframes dotPulse{
  0%,100%{opacity:1;box-shadow:0 0 0 2px rgba(79,209,165,.12)}
  50%{opacity:.5;box-shadow:0 0 0 5px rgba(79,209,165,.18)}
}

/* command bar index */
.cmd__index{display:flex;align-items:center;gap:2px;margin-left:auto;min-width:0}
.index-link{
  display:inline-flex;align-items:baseline;gap:5px;
  padding:6px 9px;text-decoration:none;white-space:nowrap;
  font-size:13.5px;letter-spacing:.01em;color:#B9CBD9;
  border:1px solid transparent;
  transition:color var(--dur) ease,background var(--dur) ease,border-color var(--dur) ease;
}
.index-link__num{font-family:var(--font-mono);font-size:10.5px;color:var(--dim);letter-spacing:.08em}
.index-link:hover{color:var(--cream);background:rgba(255,255,255,.04);border-color:var(--steel)}
.index-link:hover .index-link__num{color:var(--amber)}
.index-link[aria-current="page"]{color:var(--cream);background:rgba(255,106,26,.14);border-color:rgba(255,106,26,.5)}
.index-link[aria-current="page"] .index-link__num{color:var(--orange)}

/* quick entries */
.cmd__actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.quick-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 14px;text-decoration:none;white-space:nowrap;
  font-family:var(--font-display);font-weight:800;font-size:13.5px;letter-spacing:.08em;
  color:var(--cream);background:transparent;border:1px solid var(--steel);
  transition:color var(--dur) ease,background var(--dur) ease,border-color var(--dur) ease;
}
.quick-link:hover{color:var(--amber);border-color:var(--amber);background:rgba(255,143,77,.08)}
.quick-link--solid{
  border:0;background:var(--orange);color:#1A0E05;
  padding:8px 26px 8px 16px;
  clip-path:polygon(0 0,100% 0,calc(100% - 12px) 100%,0 100%);
}
.quick-link--solid:hover{background:var(--amber);color:#1A0E05}

/* mail copy */
.mail-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 10px;cursor:pointer;max-width:100%;
  background:rgba(10,26,42,.6);color:var(--mist);
  border:1px dashed var(--steel);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.01em;
  transition:color var(--dur) ease,border-color var(--dur) ease,background var(--dur) ease;
}
.mail-btn__text{overflow-wrap:anywhere}
.mail-btn__hint{
  font-family:var(--font-body);font-size:11px;color:var(--jade);
  border-left:1px solid var(--steel);padding-left:8px;white-space:nowrap;
}
.mail-btn:hover{color:var(--cream);border-color:var(--jade);background:rgba(79,209,165,.07)}
.mail-btn[data-copied]{border-style:solid;border-color:var(--jade)}
.mail-btn[data-copied] .mail-btn__hint{color:var(--gold)}

/* mobile toggle */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:7px 12px;cursor:pointer;
  background:transparent;border:1px solid var(--steel);color:var(--cream);
  font-family:var(--font-display);font-weight:800;font-size:13px;letter-spacing:.1em;
  transition:color var(--dur) ease,border-color var(--dur) ease,background var(--dur) ease;
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:2px;width:16px;background:currentColor;transition:transform .18s ease,opacity .18s ease}
.nav-toggle:hover{border-color:var(--amber);color:var(--amber)}
.nav-toggle[aria-expanded="true"]{background:var(--orange);border-color:var(--orange);color:#1A0E05}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* left rail */
.rail{
  position:fixed;inset:0 auto 0 0;width:var(--rail-w);z-index:70;
  display:flex;flex-direction:column;
  background:var(--deck);
  border-right:1px solid var(--steel);
  padding:18px 0 16px;
  overflow-y:auto;
}
.rail__label{
  margin:0 0 12px;padding:0 18px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--dim);
}
.rail__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.rail__link{
  display:flex;align-items:center;gap:12px;
  padding:11px 18px;text-decoration:none;
  color:#B9CBD9;border-left:2px solid transparent;
  transition:color var(--dur) ease,background var(--dur) ease,border-color var(--dur) ease;
}
.rail__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--dim);min-width:20px}
.rail__text{font-family:var(--font-display);font-weight:700;font-size:16.5px;letter-spacing:.04em}
.rail__link:hover{color:var(--cream);background:rgba(255,255,255,.04);border-left-color:var(--steel)}
.rail__link:hover .rail__num{color:var(--amber)}
.rail__link[aria-current="page"]{
  color:var(--cream);border-left-color:var(--orange);
  background:linear-gradient(90deg,rgba(255,106,26,.16),rgba(255,106,26,0) 78%);
}
.rail__link[aria-current="page"] .rail__num{color:var(--orange)}
.rail__foot{margin-top:auto;padding:16px 0 0;border-top:1px solid var(--steel)}
.rail__cta{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin:0 18px 14px;padding:10px 24px 10px 16px;
  background:var(--orange);color:#1A0E05;text-decoration:none;
  font-family:var(--font-display);font-weight:800;font-size:15px;letter-spacing:.1em;
  clip-path:polygon(0 0,100% 0,calc(100% - 14px) 100%,0 100%);
  transition:background var(--dur) ease,color var(--dur) ease;
}
.rail__cta::after{content:"→";font-family:var(--font-mono);font-size:13px}
.rail__cta:hover{background:var(--amber)}
.rail__note{margin:0 18px 12px;font-size:12px;line-height:1.6;color:var(--dim)}
.rail__meta{
  display:flex;align-items:center;gap:7px;margin:0 18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--mist);
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  background:var(--deck);
  border-top:1px solid var(--steel);
  margin-top:0;
}
.site-footer::before{
  content:"";display:block;height:2px;width:120px;
  background:var(--orange);
}
.footer__grid{
  max-width:var(--maxw);margin-inline:auto;
  padding:44px var(--gutter) 30px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.15fr;gap:34px;
}
.footer__col{min-width:0}
.footer__brand{
  display:inline-block;text-decoration:none;
  font-family:var(--font-display);font-weight:800;font-size:26px;
  letter-spacing:.06em;color:var(--cream);
  padding-left:12px;border-left:3px solid var(--orange);line-height:1.1;
}
.footer__desc{margin:14px 0 14px;font-size:13.5px;line-height:1.75;color:var(--mist);max-width:30em}
.footer__tag{
  display:inline-block;margin:0;
  padding:3px 9px;border:1px solid rgba(224,169,59,.42);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--gold);
}
.footer__title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--dim);
}
.footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer__list--contact{gap:12px}
.footer__link{
  display:inline-block;text-decoration:none;font-size:13.5px;color:#B9CBD9;
  box-shadow:inset 0 -1px 0 rgba(147,167,184,.35);
  transition:color var(--dur) ease,box-shadow var(--dur) ease;
}
.footer__link:hover{color:var(--amber);box-shadow:inset 0 -3px 0 var(--orange)}
.footer__link--inline{font-size:12px;font-family:var(--font-mono);letter-spacing:.04em}
.footer__note{margin:14px 0 0;font-size:12px;line-height:1.7;color:var(--dim);max-width:26em}
.footer__meta{margin:0;font-size:13px;line-height:1.65;color:var(--mist)}
.footer__meta--num{font-family:var(--font-mono);font-size:13px;letter-spacing:.05em;color:var(--cream);font-variant-numeric:tabular-nums}
.copy-chip{
  display:inline-flex;align-items:center;gap:10px;max-width:100%;
  padding:8px 10px;cursor:pointer;text-align:left;
  background:rgba(10,26,42,.6);color:var(--cream);
  border:1px solid var(--steel);border-left:2px solid var(--orange);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;
  transition:border-color var(--dur) ease,background var(--dur) ease,color var(--dur) ease;
}
.copy-chip__text{overflow-wrap:anywhere}
.copy-chip__hint{
  font-family:var(--font-body);font-size:11px;color:var(--jade);
  border-left:1px solid var(--steel);padding-left:8px;white-space:nowrap;
}
.copy-chip:hover{border-color:var(--amber);border-left-color:var(--amber);background:rgba(255,143,77,.08)}
.copy-chip[data-copied]{border-left-color:var(--jade)}
.copy-chip[data-copied] .copy-chip__hint{color:var(--gold)}
.footer__base{
  max-width:var(--maxw);margin-inline:auto;
  padding:16px var(--gutter) 18px;
  border-top:1px solid var(--steel);
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
}
.footer__copy,.footer__legal{
  margin:0;display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--dim);
}
.footer__dot{color:var(--steel)}
.footer__mono{font-family:var(--font-mono);font-size:11.5px;color:var(--gold)}
.footer__tape{
  height:8px;
  border-top:1px solid var(--steel);
  background:
    repeating-linear-gradient(90deg,rgba(255,106,26,.8) 0 18px,rgba(255,106,26,0) 18px 96px),
    repeating-linear-gradient(90deg,var(--steel) 0 60px,rgba(30,64,89,0) 60px 68px);
  opacity:.9;
}

/* ---------- shared page components ---------- */
.breadcrumb{padding:18px 0 0}
.breadcrumb__list{
  list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin:0;padding:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--dim);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{
  color:var(--mist);text-decoration:none;
  box-shadow:inset 0 -1px 0 rgba(147,167,184,.3);
  transition:color var(--dur) ease,box-shadow var(--dur) ease;
}
.breadcrumb__link:hover{color:var(--amber);box-shadow:inset 0 -3px 0 var(--orange)}
.breadcrumb__sep{color:var(--steel)}
.breadcrumb__current{color:var(--cream)}

.section-head{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  margin:0 0 22px;padding-bottom:12px;border-bottom:1px solid var(--steel);
}
.section-head__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--orange)}
.section-head__rule{flex:0 0 34px;height:1px;background:var(--steel)}
.section-head__title{
  margin:0;font-family:var(--font-display);font-size:20px;font-weight:800;
  letter-spacing:.06em;color:var(--cream);
}
.section-head__note{margin-left:auto;font-size:12.5px;color:var(--dim);font-family:var(--font-mono)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;cursor:pointer;text-decoration:none;
  font-family:var(--font-display);font-weight:800;font-size:15px;letter-spacing:.1em;
  color:var(--cream);background:transparent;border:1px solid var(--steel);
  transition:color var(--dur) ease,background var(--dur) ease,border-color var(--dur) ease;
}
.btn:hover{color:var(--amber);border-color:var(--amber);background:rgba(255,143,77,.08)}
.btn--primary{
  border:0;background:var(--orange);color:#1A0E05;
  padding:13px 34px 13px 22px;
  clip-path:polygon(0 0,100% 0,calc(100% - 14px) 100%,0 100%);
}
.btn--primary:hover{background:var(--amber);color:#1A0E05}
.btn--ghost{background:rgba(10,26,42,.55)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 8px;border:1px solid var(--steel);
  background:rgba(10,26,42,.55);color:var(--mist);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;
}
.tag--orange{border-color:rgba(255,106,26,.45);color:var(--amber)}
.tag--jade{border-color:rgba(79,209,165,.4);color:var(--jade)}
.tag--gold{border-color:rgba(224,169,59,.4);color:var(--gold)}

.panel{
  position:relative;
  background:var(--deck);
  border:1px solid var(--steel);
  padding:22px;
  transition:transform var(--dur) ease,outline-color var(--dur) ease;
  outline:1px solid transparent;outline-offset:-1px;
}
.panel:hover,.panel:focus-within{transform:translateX(-2px);outline-color:var(--amber)}

.prose{
  background:var(--cream);color:var(--brown);
  border:1px solid #D9CEBA;
  padding:clamp(22px,3vw,40px);
  font-size:16.5px;line-height:1.8;
}
.prose h2,.prose h3,.prose h4{color:var(--brown)}
.prose p{max-width:36em}
.prose a{color:#7A3210;text-decoration:none;box-shadow:inset 0 -1px 0 rgba(122,50,16,.45);transition:color var(--dur) ease,box-shadow var(--dur) ease}
.prose a:hover{color:var(--orange);box-shadow:inset 0 -3px 0 var(--orange)}
.prose .note,.prose small{font-size:13px;line-height:1.6;color:#6B5B47}

.figure{margin:0;position:relative;background:var(--deck);border:1px solid var(--steel);overflow:hidden}
.figure__media{
  position:relative;aspect-ratio:16/10;overflow:hidden;
  background:linear-gradient(140deg,var(--deck) 0%,var(--ink) 100%);
}
.figure__media img{width:100%;height:100%;object-fit:cover;display:block}
.figure__caption{
  padding:10px 12px;border-top:1px solid var(--steel);
  background:var(--ink);color:var(--mist);
  font-size:13px;line-height:1.6;
}
.figure--clip .figure__media{clip-path:polygon(0 0,100% 0,100% 88%,93% 100%,0 100%)}
.figure--wide .figure__media{aspect-ratio:21/9}
.figure--tall .figure__media{aspect-ratio:4/5}

.grid{display:grid;gap:18px}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--3{grid-template-columns:repeat(3,1fr)}

/* ---------- breakpoints ---------- */
@media (max-width:1200px){
  .cmd__index{display:none}
}
@media (max-width:960px){
  body{padding-left:0}
  .nav-toggle{display:inline-flex}
  .cmd__inner{gap:12px;padding:0 14px}
  .rail{
    top:var(--bar-h);left:0;right:auto;bottom:0;
    width:min(340px,86vw);
    transform:translateX(-102%);opacity:0;visibility:hidden;
    transition:transform .24s ease,opacity .24s ease,visibility 0s linear .24s;
    padding-top:14px;
    box-shadow:18px 0 40px rgba(0,0,0,.45);
  }
  .rail[data-open]{
    transform:translateX(0);opacity:1;visibility:visible;
    transition:transform .24s ease,opacity .24s ease,visibility 0s linear 0s;
  }
  .footer__grid{grid-template-columns:1fr 1fr;gap:28px}
  .grid--7-5,.grid--8-4,.grid--5-7,.grid--3{grid-template-columns:1fr}
}
@media (max-width:760px){
  .brand__status{display:none}
  .cmd__actions .quick-link:not(.quick-link--solid){display:none}
}
@media (max-width:620px){
  :root{--gutter:18px}
  .mail-btn{display:none}
  .footer__grid{grid-template-columns:1fr;gap:26px;padding-top:34px}
  .footer__base{flex-direction:column;align-items:flex-start;gap:8px}
  .section-head__note{margin-left:0;flex-basis:100%}
  h1{font-size:clamp(34px,9vw,52px)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .status-dot{animation:none;opacity:1;box-shadow:0 0 0 2px rgba(79,209,165,.14)}
  .rail{transition:none}
  .panel:hover,.panel:focus-within{transform:none}
}