/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0}
img,svg{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
i,em{font-style:normal}

/* ===== tokens ===== */
:root{
  --ink-green:#0F3B32;
  --ink-green-deep:#0A2A24;
  --gold:#C9A227;
  --gold-pale:#E8D9A8;
  --vermilion:#D7263D;
  --vermilion-deep:#A81C2D;
  --paper:#F5F1E6;
  --sage:#DDE5DE;
  --ink:#14181A;
  --muted:#6B7770;
  --white:#FFFFFF;
  --line:rgba(20,24,26,.16);
  --line-soft:rgba(20,24,26,.085);
  --line-gold:rgba(201,162,39,.55);
  --shadow-paper:0 1px 0 rgba(20,24,26,.05),0 16px 32px -20px rgba(15,59,50,.5);
  --shell:1180px;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ===== base ===== */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--gold-pale);color:var(--ink-green-deep)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.22;letter-spacing:.01em}
h1{font-size:clamp(30px,4.6vw,52px)}
h2{font-size:clamp(24px,3.2vw,36px)}
h3{font-size:clamp(19px,2.2vw,24px)}
p{margin-bottom:1em}
a{color:inherit;text-decoration:none}
a:hover{color:var(--ink-green)}
:focus-visible{outline:2px solid var(--vermilion);outline-offset:3px}
.site-footer :focus-visible,.section--ink :focus-visible{outline-color:var(--gold-pale)}
strong{font-weight:700}
code,kbd{font-family:var(--font-mono);font-size:.92em;background:var(--sage);padding:.1em .35em}

/* ===== utilities ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,44px)}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.lede{font-size:clamp(17px,1.6vw,20px);line-height:1.8;color:var(--ink);max-width:60ch}
.divider{height:0;border:0;border-top:3px double var(--line-gold);margin-block:clamp(28px,4vw,48px)}
.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}

/* ===== skip link ===== */
.skip-link{
  position:absolute;left:clamp(12px,4vw,44px);top:10px;z-index:120;
  transform:translateY(-180%);
  background:var(--vermilion);color:var(--white);
  font-size:14px;font-weight:700;letter-spacing:.1em;
  padding:.62em 1.1em;border-radius:2px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--white)}

/* ===== header / masthead ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--paper);
  border-top:4px solid var(--ink-green);
  border-bottom:1px solid var(--line-soft);
}
.masthead{background:var(--paper)}
.masthead__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:clamp(12px,2vw,28px);
  padding-block:20px;
  border-bottom:3px double var(--line-gold);
  transition:padding-block .22s var(--ease);
}
.masthead__colophon{
  display:flex;align-items:center;gap:10px;margin:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--muted);text-transform:uppercase;
}
.masthead__issue{color:var(--gold);font-weight:700}
.masthead__mark{
  padding-left:10px;border-left:1px solid var(--line);
  letter-spacing:.16em;
}
.masthead__brand{text-align:center}
.brand{display:inline-block;text-align:center}
.brand__name{
  display:block;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(24px,3.6vw,40px);
  line-height:1.1;letter-spacing:.07em;
  color:var(--ink-green);
  transition:font-size .22s var(--ease);
}
.brand:hover .brand__name{color:var(--ink-green-deep)}
.brand__sub{
  display:block;margin-top:8px;
  font-size:11.5px;letter-spacing:.32em;color:var(--muted);
}
.masthead__contact{text-align:right;line-height:1.5}
.masthead__contact-label{
  display:block;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.2em;color:var(--muted);
}
.masthead__mail{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;
  color:var(--ink-green);border-bottom:1px dotted var(--line-gold);
  word-break:break-all;
}
.masthead__mail:hover{color:var(--vermilion);border-color:var(--vermilion)}

/* condensed state */
.site-header[data-condensed] .masthead__inner{padding-block:10px}
.site-header[data-condensed] .brand__name{font-size:clamp(20px,2.8vw,28px)}
.site-header[data-condensed] .brand__sub{opacity:.6}

/* ===== nav toggle ===== */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:var(--ink-green);color:var(--paper);
  border:1px solid var(--ink-green);border-radius:2px;
  padding:10px 13px;cursor:pointer;
  font-size:12.5px;letter-spacing:.16em;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:var(--ink-green-deep)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:var(--gold);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle__text{white-space:nowrap}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ===== nav ===== */
.site-nav{
  background:linear-gradient(180deg,rgba(221,229,222,.55),rgba(245,241,230,0));
  border-top:1px solid var(--line-soft);
}
.site-nav__list{
  display:flex;justify-content:center;align-items:stretch;
  gap:clamp(8px,2.6vw,38px);
  list-style:none;
  max-width:var(--shell);margin-inline:auto;
  padding-inline:clamp(18px,4vw,44px);
}
.site-nav__link{
  position:relative;display:inline-block;
  padding:15px 2px;
  font-size:15px;font-weight:500;letter-spacing:.14em;
  color:var(--ink);
  transition:color .18s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:50%;bottom:9px;
  width:0;height:2px;background:var(--gold);
  transform:translateX(-50%);
  transition:width .2s var(--ease),background .2s var(--ease);
}
.site-nav__link:hover{color:var(--ink-green)}
.site-nav__link:hover::after{width:100%}
.site-nav__link[aria-current="page"]{color:var(--ink-green);font-weight:700}
.site-nav__link[aria-current="page"]::after{width:20px;background:var(--vermilion)}

/* ===== scroll meter ===== */
.scroll-meter{height:3px;background:rgba(20,24,26,.08);overflow:hidden}
.scroll-meter__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--vermilion));
  transition:transform .12s linear;
}

/* ===== footer ===== */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink-green);
  color:rgba(245,241,230,.86);
  border-top:5px solid var(--gold);
}
.footer__grid{
  display:grid;
  grid-template-columns:1.15fr .85fr 1fr;
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(36px,5vw,64px);
}
.footer__brand{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(22px,2.4vw,28px);letter-spacing:.06em;
  color:var(--paper);margin-bottom:12px;
}
.footer__brand-note{font-size:14.5px;line-height:1.8;color:rgba(245,241,230,.72);max-width:34ch}
.footer__icp{
  margin-top:18px;padding-top:14px;
  border-top:1px solid rgba(201,162,39,.35);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.12em;
  color:var(--gold-pale);
}
.footer__meta{font-size:13px;letter-spacing:.04em;color:rgba(245,241,230,.6);margin-top:8px;margin-bottom:0}
.footer__heading{
  font-family:var(--font-mono);font-weight:500;
  font-size:12px;letter-spacing:.26em;
  color:var(--gold);margin-bottom:16px;
}
.footer__heading--sub{margin-top:26px}
.footer__list{list-style:none;display:grid;gap:9px;font-size:15px}
.footer__link{
  color:rgba(245,241,230,.82);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer__link:hover{color:var(--gold-pale);border-bottom-color:var(--gold)}
.footer__contact{display:grid;gap:12px;font-size:14.5px}
.footer__row{display:grid;grid-template-columns:52px minmax(0,1fr);gap:10px;align-items:start}
.footer__label{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;
  color:rgba(201,162,39,.9);padding-top:4px;
}
.footer__value{color:rgba(245,241,230,.92);line-height:1.7;word-break:break-word}
.footer__value--mono{font-family:var(--font-mono);letter-spacing:.03em}
.footer__bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  padding-block:18px;
  border-top:1px solid rgba(201,162,39,.28);
}
.footer__legal{font-size:12.5px;letter-spacing:.06em;color:rgba(245,241,230,.62);margin:0}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.6em;
  padding:.82em 1.6em;border-radius:2px;
  font-family:var(--font-body);font-size:15px;font-weight:700;letter-spacing:.1em;
  border:1.5px solid transparent;cursor:pointer;text-align:center;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--vermilion);color:var(--white);border-color:var(--vermilion)}
.btn--primary:hover{background:var(--vermilion-deep);border-color:var(--vermilion-deep);color:var(--white)}
.btn--ghost{background:transparent;color:var(--ink-green);border-color:var(--ink-green)}
.btn--ghost:hover{background:var(--ink-green);color:var(--paper)}
.btn--gold{background:var(--gold);color:var(--ink-green-deep);border-color:var(--gold)}
.btn--gold:hover{background:var(--gold-pale);border-color:var(--gold);color:var(--ink-green-deep)}

/* ===== breadcrumbs ===== */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--muted);padding-block:18px 0;
}
.crumbs a{color:var(--muted);border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.crumbs a:hover{color:var(--ink-green);border-bottom-color:var(--line-gold)}
.crumbs__sep{color:var(--line-gold)}
.crumbs [aria-current="page"]{color:var(--ink-green);font-weight:700}

/* ===== page containers ===== */
.page-body{padding-block:clamp(26px,4.5vw,60px)}
.prose{max-width:68ch}
.prose p{font-size:17px;line-height:1.9}
.prose h2{margin-block:1.4em .5em}
.prose h3{margin-block:1.2em .4em}
.prose ul,.prose ol{margin-bottom:1em;padding-left:1.3em}
.prose li{margin-bottom:.4em}
.prose a{border-bottom:1px solid var(--line-gold)}

/* ===== sections / numbered anchors ===== */
.section{position:relative;padding-block:clamp(36px,5.5vw,78px)}
.section--sage{background:var(--sage)}
.section--ink{background:var(--ink-green);color:var(--paper)}
.section--ink h2,.section--ink h3{color:var(--paper)}
.section--ink .section__kicker,.section--ink .section__title{color:var(--paper)}
.section__head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,2.6vw,34px);align-items:start;
  border-top:2px solid var(--ink-green);
  padding-top:18px;margin-bottom:clamp(20px,3vw,36px);
}
.section--ink .section__head{border-top-color:var(--gold)}
.section__index{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(38px,6.4vw,70px);line-height:.82;
  letter-spacing:-.03em;color:var(--gold);
}
.section__kicker{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--muted);margin-bottom:8px;
}
.section__title{font-size:clamp(23px,3.2vw,36px)}
.section__body{max-width:70ch}

/* ===== panels & cards ===== */
.panel{
  background:var(--white);
  border:1px solid var(--line);
  padding:clamp(18px,2.6vw,32px);
  box-shadow:var(--shadow-paper);
}
.card{
  position:relative;
  display:block;
  background:var(--white);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:var(--shadow-paper);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.card::before{
  content:"";position:absolute;left:0;top:0;width:3px;height:34px;background:var(--gold);
}
.card:hover{transform:translateY(-3px);border-color:var(--line-gold)}
.card__index{
  display:block;font-family:var(--font-mono);font-size:12.5px;
  letter-spacing:.2em;color:var(--gold);margin-bottom:8px;
}
.card__title{
  display:block;font-family:var(--font-display);font-weight:900;
  font-size:clamp(18px,2vw,22px);line-height:1.35;margin-bottom:8px;
}
.card__text{font-size:15.5px;line-height:1.8;color:var(--muted);margin:0}
.section--ink .card{background:rgba(255,255,255,.06);border-color:rgba(201,162,39,.35)}
.section--ink .card__text{color:rgba(245,241,230,.74)}

/* ===== tags ===== */
.tag{
  display:inline-block;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  padding:.35em .72em;
  background:var(--gold-pale);color:var(--ink-green);
  border:1px solid var(--line-gold);
}
.tag--hot{background:var(--vermilion);color:var(--white);border-color:var(--vermilion)}

/* ===== grids ===== */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,.85fr) minmax(0,1.4fr)}

/* ===== figure ===== */
.figure{display:grid;gap:10px;margin:0}
.figure__frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  background:var(--sage);
  box-shadow:var(--shadow-paper);
}
.figure__frame::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(15,59,50,.10) 0 1px,transparent 1px 26px),
    repeating-linear-gradient(90deg,rgba(15,59,50,.10) 0 1px,transparent 1px 26px),
    linear-gradient(135deg,rgba(201,162,39,.16),rgba(221,229,222,.9));
  background-size:auto,auto,auto;
}
.figure__frame img,.figure__frame svg,.figure__frame picture{display:block;width:100%;height:100%;object-fit:cover;position:relative}
.figure__label{
  position:absolute;left:0;top:0;z-index:2;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  background:var(--ink-green);color:var(--gold-pale);
  padding:.4em .8em;
}
.figure__caption{
  font-size:12.5px;line-height:1.7;letter-spacing:.06em;color:var(--muted);
  border-left:2px solid var(--gold);padding-left:10px;
}
.figure--wide .figure__frame{aspect-ratio:21/9}
.figure--tall .figure__frame{aspect-ratio:4/5}

/* ===== table ===== */
.index-table{font-size:15px;background:var(--white);border:1px solid var(--line);box-shadow:var(--shadow-paper)}
.index-table caption{
  caption-side:top;text-align:left;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;
  color:var(--muted);padding:12px 14px;background:var(--paper);
  border-bottom:1px solid var(--line);
}
.index-table th{
  background:var(--gold-pale);color:var(--ink-green);
  font-family:var(--font-mono);font-weight:700;font-size:11.5px;
  letter-spacing:.16em;text-align:left;
  padding:12px 14px;border-bottom:1px solid var(--line-gold);
}
.index-table td{padding:12px 14px;border-bottom:1px solid var(--line-soft);vertical-align:top}
.index-table tbody tr{transition:background .16s var(--ease)}
.index-table tbody tr:hover{background:rgba(221,229,222,.6)}
.index-table .is-num{font-family:var(--font-mono);font-size:16px;letter-spacing:.04em;color:var(--ink-green)}

/* ===== steps ===== */
.steps{list-style:none;counter-reset:step;display:grid;gap:16px}
.steps__item{position:relative;padding-left:56px;min-height:40px;font-size:16px}
.steps__item::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  position:absolute;left:0;top:-2px;
  width:38px;height:38px;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:15px;font-weight:700;
  color:var(--gold);background:var(--white);
  border:1px solid var(--line-gold);
}
.section--ink .steps__item::before{background:rgba(255,255,255,.08);color:var(--gold-pale)}

/* ===== notes ===== */
.note{
  border-left:3px solid var(--gold);
  background:var(--gold-pale);
  padding:14px 18px;
  font-size:15px;line-height:1.8;
  color:var(--ink-green-deep);
}
.note--alert{border-left-color:var(--vermilion);background:rgba(215,38,61,.09);color:var(--vermilion-deep)}
.section--ink .note{background:rgba(232,217,168,.14);color:var(--gold-pale)}

/* ===== accordion ===== */
.accordion{border-top:1px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__summary{
  display:flex;justify-content:space-between;align-items:flex-start;gap:18px;
  padding:16px 0;cursor:pointer;list-style:none;
  font-family:var(--font-display);font-weight:700;font-size:clamp(16px,1.8vw,19px);
}
.accordion__summary::-webkit-details-marker{display:none}
.accordion__summary::after{
  content:"+";font-family:var(--font-mono);font-size:18px;color:var(--gold);line-height:1;
  padding-top:4px;
}
.accordion__item[open] .accordion__summary::after{content:"–"}
.accordion__item[open] .accordion__summary{color:var(--ink-green)}
.accordion__body{padding-bottom:18px;font-size:16px;line-height:1.85;color:var(--ink)}

/* ===== reveal ===== */
.has-js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ===== responsive ===== */
@media (max-width:1024px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1fr)}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__col:first-child{grid-column:1 / -1}
}
@media (max-width:880px){
  body{font-size:16px}
  .masthead__inner{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:
      "brand toggle"
      "contact contact";
    row-gap:10px;padding-block:14px;
  }
  .masthead__brand{grid-area:brand;text-align:left}
  .brand{text-align:left}
  .brand__name{letter-spacing:.05em}
  .brand__sub{letter-spacing:.18em;margin-top:5px}
  .masthead__colophon{display:none}
  .masthead__contact{grid-area:contact;text-align:left;display:flex;flex-wrap:wrap;align-items:baseline;gap:8px}
  .masthead__contact-label{display:inline}
  .nav-toggle{grid-area:toggle;display:inline-flex}

  .site-nav{
    max-height:0;overflow:hidden;
    transition:max-height .28s var(--ease);
  }
  .site-header[data-open] .site-nav{max-height:34rem;overflow:auto}
  .site-nav__list{flex-direction:column;gap:0;padding-block:4px 10px}
  .site-nav__link{
    display:block;padding:14px 12px;
    border-bottom:1px solid var(--line-soft);
    font-size:16px;
  }
  .site-nav__link::after{
    left:0;bottom:auto;top:50%;
    width:0;height:16px;margin-top:-8px;
    transform:none;
  }
  .site-nav__link:hover::after{width:2px;background:var(--gold)}
  .site-nav__link[aria-current="page"]{background:rgba(215,38,61,.07)}
  .site-nav__link[aria-current="page"]::after{width:2px;background:var(--vermilion)}

  .grid--2,.grid--3,.grid--split{grid-template-columns:minmax(0,1fr)}
  .section__head{grid-template-columns:auto minmax(0,1fr);gap:14px}
  .figure--wide .figure__frame{aspect-ratio:16/10}
}
@media (max-width:620px){
  .footer__grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer__col:first-child{grid-column:auto}
  .footer__bottom{flex-direction:column;align-items:flex-start}
  .figure--tall .figure__frame{aspect-ratio:3/4}
  .index-table{display:block;overflow-x:auto;white-space:nowrap}
}

/* ===== reduced motion ===== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .card:hover,.btn:hover{transform:none}
}