:root{
  --fh-ink:#071A2B;
  --fh-ink-soft:#0B2334;
  --fh-pitch:#0E3B32;
  --fh-stone:#5F6F78;
  --fh-moss:#6F8F6A;
  --fh-clay:#B76E4E;
  --fh-paper:#F3EFE6;
  --fh-signal:#FF6B2C;
  --fh-signal-deep:#C84A16;
  --fh-card:#FCFAF4;
  --fh-mist:#C9D6DC;
  --fh-font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --fh-font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --fh-font-mono:"IBM Plex Mono","Roboto Mono",SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --fh-max:1440px;
  --fh-gutter:clamp(18px,4vw,56px);
  --fh-line:rgba(201,214,220,.28);
  --fh-line-soft:rgba(201,214,220,.16);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--fh-paper);
  color:var(--fh-ink);
  font-family:var(--fh-font-body);
  font-size:17px;
  line-height:1.8;
  font-weight:400;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl{margin:0;padding:0}
ul,ol{list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
strong{font-weight:600}
:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--fh-signal);
  outline-offset:3px;
  border-radius:2px;
}
::selection{background:var(--fh-signal);color:#08131C}

/* ---------- layout primitives ---------- */
.fh-container{width:100%;max-width:var(--fh-max);margin:0 auto;padding:0 var(--fh-gutter)}
.fh-section{padding-block:clamp(52px,7vw,112px)}
.fh-section--paper{background:var(--fh-paper);color:var(--fh-ink)}
.fh-section--dark{background:var(--fh-ink);color:var(--fh-paper)}
.fh-section--pitch{background:var(--fh-pitch);color:var(--fh-paper)}
.fh-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.fh-span-3{grid-column:span 3}
.fh-span-4{grid-column:span 4}
.fh-span-5{grid-column:span 5}
.fh-span-6{grid-column:span 6}
.fh-span-7{grid-column:span 7}
.fh-span-8{grid-column:span 8}
.fh-span-9{grid-column:span 9}
.fh-span-12{grid-column:span 12}

/* ---------- typography ---------- */
.fh-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.16em;line-height:1.4;
  color:var(--fh-stone);
}
.fh-eyebrow::before{content:"";width:26px;height:1px;background:currentColor;flex:none}
.fh-section--dark .fh-eyebrow,.fh-section--pitch .fh-eyebrow{color:var(--fh-moss)}
.fh-display{
  font-family:var(--fh-font-display);
  font-weight:500;
  font-size:clamp(36px,6vw,96px);
  line-height:1.06;
  letter-spacing:-.02em;
  margin:0;
}
.fh-lead{
  font-size:clamp(17px,1.5vw,19px);
  line-height:1.8;
  color:var(--fh-stone);
  max-width:38em;
}
.fh-section--dark .fh-lead,.fh-section--pitch .fh-lead{color:rgba(243,239,230,.8)}
.fh-prose{max-width:36em;font-size:17px;line-height:1.85}
.fh-prose p{margin-bottom:1.15em}
.fh-prose p:last-child{margin-bottom:0}
.fh-num{font-family:var(--fh-font-mono);font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:0}
.fh-note{
  max-width:34em;
  padding:4px 0 4px 16px;
  border-left:2px solid var(--fh-clay);
  font-size:13px;line-height:1.75;
  color:var(--fh-stone);
}
.fh-section--dark .fh-note,.fh-section--pitch .fh-note{color:rgba(243,239,230,.72);border-left-color:var(--fh-signal)}

/* ---------- tags / buttons ---------- */
.fh-tag{
  display:inline-block;
  padding:4px 10px;
  border:1px solid var(--fh-mist);
  border-radius:999px;
  font-size:12px;letter-spacing:.08em;line-height:1.5;
  color:var(--fh-stone);
}
.fh-tag--signal{background:var(--fh-signal);border-color:var(--fh-signal);color:#08131C;font-weight:600}
.fh-tag--moss{background:transparent;border-color:var(--fh-moss);color:var(--fh-moss)}
.fh-btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 24px;
  font-family:inherit;font-size:14px;letter-spacing:.06em;line-height:1.4;
  border:1px solid transparent;border-radius:2px;
  cursor:pointer;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.fh-btn--primary{background:var(--fh-signal);color:#08131C;font-weight:600}
.fh-btn--primary:hover{background:#FF7F4A}
.fh-btn--ghost{border-color:rgba(201,214,220,.45);color:inherit;background:transparent}
.fh-btn--ghost:hover{border-color:currentColor;background:rgba(201,214,220,.12)}

/* ---------- index / breadcrumb ---------- */
.fh-index{
  display:flex;flex-wrap:wrap;gap:6px 24px;
  padding:14px 0;
  border-top:1px solid var(--fh-line);
  border-bottom:1px solid var(--fh-line);
  font-size:12px;letter-spacing:.1em;
}
.fh-index a{color:var(--fh-stone);transition:color .18s ease}
.fh-index a:hover{color:var(--fh-signal-deep)}
.fh-index__num{font-family:var(--fh-font-mono);color:var(--fh-clay);margin-right:6px}
.fh-section--dark .fh-index,.fh-section--pitch .fh-index{border-color:rgba(201,214,220,.22)}
.fh-section--dark .fh-index a,.fh-section--pitch .fh-index a{color:rgba(243,239,230,.72)}
.fh-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px;
  font-size:12px;letter-spacing:.08em;
  color:var(--fh-stone);
}
.fh-breadcrumb a{border-bottom:1px solid transparent;transition:border-color .18s ease}
.fh-breadcrumb a:hover{border-bottom-color:currentColor}
.fh-breadcrumb__sep{opacity:.5}
.fh-breadcrumb [aria-current="page"]{color:var(--fh-ink)}
.fh-breadcrumb--invert{color:rgba(243,239,230,.66)}
.fh-breadcrumb--invert [aria-current="page"]{color:var(--fh-paper)}

/* ---------- figure ---------- */
.fh-figure{margin:0}
.fh-figure__media{
  position:relative;
  aspect-ratio:var(--fh-ratio,16/9);
  overflow:hidden;
  background:var(--fh-pitch);
  border:1px solid rgba(201,214,220,.24);
  border-radius:2px;
}
.fh-figure__media::after{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(201,214,220,.16) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(0deg,rgba(201,214,220,.16) 0 1px,transparent 1px 48px);
  opacity:.45;
}
.fh-figure__media img{
  position:relative;z-index:1;
  width:100%;height:100%;object-fit:cover;
  display:block;
}
.fh-figure__caption{
  margin-top:10px;
  font-size:12px;line-height:1.7;letter-spacing:.04em;
  color:var(--fh-stone);
}
.fh-figure--wide{--fh-ratio:21/9}
.fh-figure--tall{--fh-ratio:3/4}

/* ---------- reveal ---------- */
.fh-js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.fh-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- skip link ---------- */
.fh-skip{
  position:absolute;left:16px;top:-72px;z-index:300;
  padding:10px 18px;
  background:var(--fh-signal);color:#08131C;
  font-size:13px;letter-spacing:.08em;border-radius:2px;
  transition:top .2s ease;
}
.fh-skip:focus{top:12px}

/* ---------- header ---------- */
.fh-header{
  position:sticky;top:0;z-index:90;
  background:var(--fh-ink);
  color:var(--fh-paper);
  border-bottom:1px solid var(--fh-line-soft);
  transition:background-color .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.fh-header[data-scrolled="true"]{
  background:rgba(7,26,43,.96);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:0 14px 34px rgba(4,16,26,.38);
  border-bottom-color:rgba(201,214,220,.28);
}
.fh-progress{
  position:absolute;left:0;right:0;top:0;height:2px;z-index:3;
  background:rgba(201,214,220,.14);overflow:hidden;
}
.fh-progress__bar{
  display:block;height:100%;width:100%;
  background:var(--fh-signal);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}
.fh-header__inner{
  position:relative;
  width:100%;max-width:var(--fh-max);
  margin:0 auto;
  padding:0 var(--fh-gutter);
  min-height:84px;
  display:flex;align-items:center;
  gap:clamp(12px,2.4vw,40px);
}
.fh-brand{
  display:inline-flex;align-items:center;gap:13px;
  margin-right:auto;
  color:inherit;
  flex:none;
}
.fh-brand__mark{
  width:30px;height:30px;flex:none;
  display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:3px;
}
.fh-brand__mark i{display:block;background:rgba(201,214,220,.26)}
.fh-brand__mark i:nth-child(2){background:var(--fh-signal)}
.fh-brand__mark i:nth-child(4){background:var(--fh-moss)}
.fh-brand__text{display:flex;flex-direction:column;line-height:1.25}
.fh-brand__name{font-size:19px;font-weight:700;letter-spacing:.04em}
.fh-brand__note{
  margin-top:3px;
  font-size:11px;letter-spacing:.16em;
  color:var(--fh-mist);opacity:.72;
  white-space:nowrap;
}
.fh-navtoggle{
  display:none;
  align-items:center;gap:9px;
  padding:9px 13px;
  border:1px solid rgba(201,214,220,.34);
  border-radius:2px;
  font-size:12px;letter-spacing:.14em;line-height:1;
  cursor:pointer;
  transition:border-color .18s ease,background-color .18s ease;
}
.fh-navtoggle:hover{border-color:rgba(201,214,220,.62);background:rgba(243,239,230,.06)}
.fh-navtoggle__bars{display:grid;gap:3px;width:16px;flex:none}
.fh-navtoggle__bars i{display:block;height:1.5px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
.fh-navtoggle[aria-expanded="true"] .fh-navtoggle__bars i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.fh-navtoggle[aria-expanded="true"] .fh-navtoggle__bars i:nth-child(2){opacity:0}
.fh-navtoggle[aria-expanded="true"] .fh-navtoggle__bars i:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}
.fh-navtoggle__label{white-space:nowrap}
.fh-nav{display:flex;align-items:center}
.fh-nav__list{display:flex;align-items:center;gap:clamp(10px,1.5vw,24px)}
.fh-nav__link{
  position:relative;display:inline-block;
  padding:8px 2px;
  font-size:15px;letter-spacing:.04em;
  color:rgba(243,239,230,.78);
  transition:color .18s ease;
  white-space:nowrap;
}
.fh-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:1px;
  background:var(--fh-signal);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .22s ease;
}
.fh-nav__link:hover,.fh-nav__link:focus-visible{color:var(--fh-card)}
.fh-nav__link:hover::after,.fh-nav__link:focus-visible::after{transform:scaleX(1)}
.fh-nav__link[aria-current="page"]{color:var(--fh-card)}
.fh-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--fh-signal)}
.fh-nav__tools{
  display:flex;align-items:center;gap:8px;
  margin-left:clamp(14px,2vw,28px);
  padding-left:clamp(14px,2vw,28px);
  border-left:1px solid var(--fh-line);
}
.fh-nav__coord{
  font-size:11px;letter-spacing:.14em;
  color:rgba(201,214,220,.55);
  margin-right:4px;white-space:nowrap;
}
.fh-tool{
  padding:7px 13px;
  border:1px solid rgba(201,214,220,.28);
  border-radius:999px;
  background:rgba(243,239,230,.06);
  font-size:13px;letter-spacing:.06em;line-height:1.4;
  color:var(--fh-paper);
  cursor:pointer;white-space:nowrap;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.fh-tool:hover{background:rgba(243,239,230,.14);border-color:rgba(201,214,220,.5)}
.fh-tool[aria-expanded="true"]{background:var(--fh-signal);border-color:var(--fh-signal);color:#08131C;font-weight:600}
.fh-panel{
  position:absolute;top:calc(100% + 2px);right:var(--fh-gutter);
  width:min(336px,calc(100vw - 2 * var(--fh-gutter)));
  padding:18px 20px 20px;
  background:var(--fh-card);
  color:var(--fh-ink);
  border-top:3px solid var(--fh-signal);
  box-shadow:0 22px 46px rgba(4,16,26,.34);
  z-index:6;
}
.fh-panel[hidden]{display:none}
.fh-panel__eyebrow{
  font-size:11px;letter-spacing:.16em;
  color:var(--fh-signal-deep);
  margin-bottom:6px;
}
.fh-panel__title{
  font-size:20px;font-weight:600;letter-spacing:-.01em;
  line-height:1.3;margin-bottom:8px;
}
.fh-panel__text{
  font-size:13px;line-height:1.75;
  color:var(--fh-stone);
  margin-bottom:14px;
}
.fh-panel__link{
  display:inline-block;
  font-size:13px;letter-spacing:.06em;
  color:var(--fh-signal-deep);
  border-bottom:1px solid currentColor;
  padding-bottom:2px;
}
.fh-panel__link:hover{color:var(--fh-ink)}

/* ---------- footer ---------- */
.fh-footer{
  background:var(--fh-ink);
  color:var(--fh-paper);
}
.fh-footer__tape{
  display:flex;overflow:hidden;
  background:var(--fh-pitch);
  border-top:1px solid var(--fh-line-soft);
  border-bottom:1px solid var(--fh-line-soft);
}
.fh-footer__tick{
  flex:1 1 auto;min-width:0;
  padding:9px 0;
  text-align:center;
  font-family:var(--fh-font-mono);
  font-size:11px;letter-spacing:.14em;
  color:rgba(243,239,230,.55);
  border-right:1px solid rgba(201,214,220,.12);
  white-space:nowrap;overflow:hidden;
}
.fh-footer__tick:last-child{
  border-right:0;
  color:var(--fh-signal);
  letter-spacing:.1em;
}
.fh-footer__inner{
  width:100%;max-width:var(--fh-max);
  margin:0 auto;
  padding:clamp(44px,6vw,80px) var(--fh-gutter) clamp(32px,4vw,52px);
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(32px,5vw,72px);
}
.fh-brand--footer{margin-right:0;color:var(--fh-paper)}
.fh-brand--footer .fh-brand__name{font-size:20px}
.fh-brand--footer .fh-brand__note{color:var(--fh-moss);opacity:1}
.fh-brand--footer .fh-brand__mark i{background:rgba(201,214,220,.22)}
.fh-brand--footer .fh-brand__mark i:nth-child(2){background:var(--fh-signal)}
.fh-brand--footer .fh-brand__mark i:nth-child(4){background:var(--fh-moss)}
.fh-footer__summary{
  margin-top:18px;
  max-width:24em;
  font-size:14px;line-height:1.8;
  color:rgba(243,239,230,.74);
}
.fh-footer__contact{
  margin-top:20px;
  display:grid;gap:6px;
  font-size:13px;line-height:1.7;
  color:rgba(243,239,230,.66);
  font-family:var(--fh-font-mono);
  letter-spacing:.02em;
  word-break:break-word;
}
.fh-footer__note{
  margin-top:14px;
  max-width:32em;
  font-size:12px;line-height:1.75;
  color:rgba(243,239,230,.46);
}
.fh-footer__nav{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:clamp(24px,3vw,44px);
}
.fh-footer__title{
  margin-bottom:14px;
  font-size:12px;font-weight:500;
  letter-spacing:.16em;
  color:var(--fh-moss);
}
.fh-footer__list{display:grid;gap:9px}
.fh-footer__list a{
  position:relative;display:inline-block;
  font-size:15px;letter-spacing:.02em;
  color:rgba(243,239,230,.82);
  transition:color .18s ease;
}
.fh-footer__list a::after{
  content:"";position:absolute;left:0;bottom:-2px;
  width:100%;height:1px;background:var(--fh-signal);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .2s ease;
}
.fh-footer__list a:hover{color:var(--fh-card)}
.fh-footer__list a:hover::after,.fh-footer__list a:focus-visible::after{transform:scaleX(1)}
.fh-footer__base{
  width:100%;max-width:var(--fh-max);
  margin:0 auto;
  padding:20px var(--fh-gutter) 40px;
  display:flex;flex-wrap:wrap;gap:8px 28px;
  justify-content:space-between;align-items:baseline;
  border-top:1px solid var(--fh-line-soft);
  font-size:12px;letter-spacing:.06em;
  color:rgba(243,239,230,.52);
}
.fh-footer__copy{font-family:var(--fh-font-mono)}
.fh-footer__meta{font-family:var(--fh-font-mono);color:rgba(243,239,230,.42)}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .fh-nav__coord{display:none}
  .fh-nav__link{font-size:14px}
  .fh-nav__list{gap:clamp(8px,1.2vw,16px)}
}
@media (max-width:960px){
  .fh-header__inner{min-height:72px}
  .fh-navtoggle{display:inline-flex}
  .fh-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;
    padding:10px var(--fh-gutter) 26px;
    background:var(--fh-ink);
    border-top:1px solid var(--fh-line-soft);
    border-bottom:1px solid var(--fh-line-soft);
    box-shadow:0 20px 40px rgba(4,16,26,.42);
    z-index:5;
    max-height:calc(100vh - 74px);
    overflow-y:auto;
  }
  .fh-nav[data-open="true"]{display:flex}
  .fh-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .fh-nav__link{
    display:block;
    padding:15px 0;
    font-size:16px;
    border-bottom:1px solid rgba(201,214,220,.14);
  }
  .fh-nav__link::after{display:none}
  .fh-nav__link[aria-current="page"]{color:var(--fh-signal)}
  .fh-nav__link[aria-current="page"]::before{
    content:"";display:inline-block;
    width:6px;height:6px;margin-right:10px;vertical-align:2px;
    background:var(--fh-signal);
  }
  .fh-nav__tools{
    flex-direction:column;align-items:stretch;
    margin:18px 0 0;padding:18px 0 0;
    border-left:0;border-top:1px solid var(--fh-line-soft);
  }
  .fh-tool{width:100%;text-align:center;padding:12px 14px;font-size:14px}
  .fh-panel{right:var(--fh-gutter);left:var(--fh-gutter);width:auto;top:calc(100% + 8px)}
  .fh-footer__inner{grid-template-columns:minmax(0,1fr);gap:36px}
}
@media (max-width:860px){
  .fh-span-3,.fh-span-4,.fh-span-5,.fh-span-6,.fh-span-7,.fh-span-8,.fh-span-9{grid-column:1/-1}
}
@media (max-width:720px){
  body{font-size:16px;line-height:1.78}
  .fh-brand__note{font-size:10px;letter-spacing:.12em}
  .fh-brand__name{font-size:17px}
  .fh-brand__mark{width:26px;height:26px}
  .fh-footer__tick:nth-child(n+6){display:none}
  .fh-footer__base{justify-content:flex-start;font-size:11px}
  .fh-prose{max-width:none}
  .fh-btn{padding:12px 18px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .fh-js [data-reveal]{opacity:1;transform:none}
}