*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit}
:focus-visible{outline:3px solid #E4572E;outline-offset:3px}

:root{
  --sea-900:#07263D;
  --sea-700:#0E3A5A;
  --route-500:#1B6690;
  --mist:#6E93A8;
  --coral-600:#E4572E;
  --coral-300:#FF9A76;
  --sand:#D9A94C;
  --foam:#F6F3EC;
  --paper:#E7E1D5;
  --ink:#101E29;
  --tide:#2F8F73;
  --ink-soft:#3B4D5C;
  --line-ink:rgba(16,30,41,.16);
  --line-strong:rgba(16,30,41,.32);
  --line-light:rgba(246,243,236,.22);
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,Consolas,Menlo,monospace;
  --wrap:1180px;
  --wrap-wide:1360px;
  --pad:clamp(16px,4vw,40px);
  --header-h:68px;
  --header-h-condensed:56px;
  --radius:2px;
  --shadow-paper:0 1px 0 rgba(16,30,41,.06),0 8px 24px -16px rgba(7,38,61,.45);
}

body{
  background:var(--foam);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

/* ---------- skip link ---------- */
.vf-skip{position:fixed;top:8px;left:8px;z-index:300;transform:translateY(-240%);background:var(--coral-600);color:#fff;padding:10px 16px;font-size:14px;font-weight:600;text-decoration:none;border-radius:var(--radius);transition:transform .18s ease}
.vf-skip:focus,.vf-skip:focus-visible{transform:none}

/* ---------- header ---------- */
.vf-header{
  position:sticky;top:0;z-index:100;
  background:var(--sea-900);
  color:var(--foam);
  border-bottom:1px solid rgba(246,243,236,.14);
  box-shadow:0 12px 32px -26px rgba(7,38,61,.95);
}
.vf-header__progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(246,243,236,.1);pointer-events:none}
.vf-header__progress>span{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--coral-600),var(--coral-300) 55%,var(--sand));transform:scaleX(var(--scroll-progress,0));transform-origin:0 50%;transition:transform .12s linear}
.vf-header__inner{
  position:relative;
  width:min(var(--wrap-wide),100% - (var(--pad) * 2));
  margin-inline:auto;
  display:flex;align-items:center;
  gap:clamp(10px,2vw,26px);
  min-height:var(--header-h);
  padding-block:10px;
  transition:min-height .2s ease,padding .2s ease;
}
.vf-header[data-condensed] .vf-header__inner{min-height:var(--header-h-condensed);padding-block:6px}

.vf-brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto}
.vf-brand__mark{
  position:relative;width:30px;height:30px;flex:0 0 auto;
  border:1px solid rgba(255,154,118,.75);
  border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(27,102,144,.6),rgba(7,38,61,.25));
  overflow:hidden;
}
.vf-brand__mark::before{content:"";position:absolute;inset:5px;border-left:1px solid rgba(246,243,236,.5);border-bottom:1px solid rgba(246,243,236,.26)}
.vf-brand__mark::after{content:"";position:absolute;right:6px;top:6px;width:6px;height:6px;border-radius:50%;background:var(--coral-600);box-shadow:-9px 9px 0 -1px var(--sand)}
.vf-brand__text{display:flex;flex-direction:column;line-height:1.12}
.vf-brand__name{font-size:16px;font-weight:800;letter-spacing:-.01em;color:#fff;white-space:nowrap}
.vf-brand__sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;text-transform:uppercase;color:rgba(246,243,236,.55);margin-top:3px}

.vf-batch{display:flex;align-items:center;gap:8px;flex:0 0 auto;padding-left:clamp(8px,1.4vw,18px);border-left:1px solid var(--line-light)}
.vf-badge--version{font-family:var(--font-mono);font-weight:700;font-size:12px;line-height:1.5;letter-spacing:.08em;color:var(--sea-900);background:var(--sand);padding:2px 6px;border-radius:1px}
.vf-batch__state{display:inline-flex;align-items:center;gap:6px;font-size:11px;letter-spacing:.12em;color:rgba(246,243,236,.64);white-space:nowrap}
.vf-batch__dot{width:6px;height:6px;border-radius:50%;background:var(--tide);box-shadow:0 0 0 3px rgba(47,143,115,.22)}

.vf-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.vf-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:5px;
  padding:8px 10px;font-size:14px;text-decoration:none;
  color:rgba(246,243,236,.78);
  border-bottom:2px solid transparent;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.vf-nav__link::before{content:attr(data-index);font-family:var(--font-mono);font-size:9px;letter-spacing:.06em;color:rgba(246,243,236,.38)}
.vf-nav__link:hover{color:#fff;background:rgba(246,243,236,.07)}
.vf-nav__link[aria-current="page"]{color:#fff;font-weight:600;border-bottom-color:var(--coral-600)}
.vf-nav__link[aria-current="page"]::before{color:var(--coral-300)}
.vf-header[data-condensed] .vf-nav__link{font-size:13px;padding:6px 8px}
.vf-header[data-condensed] .vf-nav__link::before{display:none}

.vf-quick{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.vf-quick__link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;padding:7px 12px;white-space:nowrap;
  border:1px solid var(--line-light);border-radius:var(--radius);
  color:var(--foam);text-decoration:none;
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.vf-quick__link:hover{border-color:var(--coral-300);color:#fff}
.vf-quick__link--accent{background:var(--coral-600);border-color:var(--coral-600);color:#fff;font-weight:600}
.vf-quick__link--accent:hover{filter:brightness(1.1)}

.vf-navtoggle{display:none;align-items:center;gap:8px;background:transparent;border:1px solid var(--line-light);border-radius:var(--radius);color:var(--foam);padding:8px 10px;cursor:pointer;transition:border-color .18s ease}
.vf-navtoggle:hover{border-color:var(--coral-300)}
.vf-navtoggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.vf-navtoggle__bar{display:block;width:16px;height:1.5px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
.vf-navtoggle__label{font-size:11px;letter-spacing:.14em}
.vf-header[data-open] .vf-navtoggle__bar:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.vf-header[data-open] .vf-navtoggle__bar:nth-child(2){opacity:0}
.vf-header[data-open] .vf-navtoggle__bar:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

.vf-header :focus-visible,.vf-footer :focus-visible{outline-color:var(--coral-300)}

/* ---------- footer ---------- */
.vf-footer{position:relative;overflow:hidden;background:var(--sea-900);color:rgba(246,243,236,.78)}
.vf-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    repeating-linear-gradient(115deg,rgba(246,243,236,.05) 0 1px,transparent 1px 46px),
    radial-gradient(120% 90% at 12% 0%,rgba(27,102,144,.5),transparent 62%),
    radial-gradient(90% 80% at 92% 8%,rgba(228,87,46,.16),transparent 64%);
}
.vf-footer__inner{position:relative;width:min(var(--wrap-wide),100% - (var(--pad) * 2));margin-inline:auto;padding-top:clamp(36px,6vw,64px)}
.vf-footer__grid{
  display:grid;
  grid-template-columns:1.25fr 1.5fr 1.35fr 1fr;
  gap:clamp(20px,3vw,40px);
  padding-bottom:clamp(28px,4vw,44px);
  border-bottom:1px solid var(--line-light);
}
.vf-footer__col{min-width:0}
.vf-footer__heading{font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--sand);margin-bottom:14px}
.vf-footer__name{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:-.01em;color:#fff;line-height:1.3}
.vf-footer__tagline{margin-top:12px;font-size:13.5px;line-height:1.8;color:rgba(246,243,236,.7);max-width:26ch}
.vf-footer__seal{
  margin-top:18px;width:78px;height:78px;
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;
  border:1px solid rgba(217,169,76,.6);border-radius:50%;
  font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;line-height:1.35;color:var(--sand);
  transform:rotate(-6deg);
}
.vf-footer__group+.vf-footer__group{margin-top:16px}
.vf-footer__groupname{font-size:11px;letter-spacing:.14em;color:var(--mist);margin-bottom:8px}
.vf-footer__list{display:grid;gap:8px}
.vf-footer__link{display:inline-block;font-size:14px;line-height:1.6;color:rgba(246,243,236,.86);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:1px;transition:color .18s ease,border-color .18s ease}
.vf-footer__link:hover{color:#fff;border-bottom-color:var(--coral-600)}
.vf-footer__contact{display:grid;gap:14px}
.vf-footer__contactrow{display:grid;gap:4px;justify-items:start}
.vf-footer__label{font-size:11px;letter-spacing:.14em;color:var(--mist)}
.vf-footer__value{font-size:14px;line-height:1.7;color:rgba(246,243,236,.92);word-break:break-word}
.vf-footer__value--mono{font-family:var(--font-mono);letter-spacing:.02em}
.vf-footer__note{margin-top:16px;font-size:12px;line-height:1.7;color:rgba(246,243,236,.58);max-width:32ch}
.vf-copychip{
  display:inline-flex;align-items:center;gap:6px;margin-top:2px;
  padding:4px 9px;font-size:11px;letter-spacing:.08em;
  background:transparent;border:1px solid var(--line-light);border-radius:var(--radius);
  color:rgba(246,243,236,.8);cursor:pointer;
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.vf-copychip:hover{border-color:var(--coral-300);color:#fff}
.vf-copychip[data-copied]{background:var(--tide);border-color:var(--tide);color:#fff}
.vf-footer__bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;padding:18px 0 26px;font-size:12px;color:rgba(246,243,236,.6)}
.vf-footer__legal{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;letter-spacing:.04em}
.vf-footer__meta{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;font-family:var(--font-mono);letter-spacing:.06em}

/* ---------- layout ---------- */
.vf-wrap{width:min(var(--wrap),100% - (var(--pad) * 2));margin-inline:auto}
.vf-wrap--wide{width:min(var(--wrap-wide),100% - (var(--pad) * 2));margin-inline:auto}
.vf-section{padding-block:clamp(40px,7vw,84px)}
.vf-section--narrow{padding-block:clamp(26px,4vw,48px)}
.vf-section--tint{background:var(--paper)}
.vf-section--ink{background:var(--sea-900);color:rgba(246,243,236,.86)}
.vf-section--ink .vf-h1,.vf-section--ink .vf-h2,.vf-section--ink .vf-h3{color:#fff}
.vf-section--ink .vf-lede,.vf-section--ink .vf-prose{color:rgba(246,243,236,.78)}

.vf-grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.vf-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.vf-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.vf-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.vf-grid--offset>*:nth-child(3n+2){margin-top:48px}
.vf-grid--offset>*:nth-child(3n){margin-top:-24px}

/* ---------- typography ---------- */
.vf-eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--route-500)}
.vf-section--ink .vf-eyebrow{color:var(--coral-300)}
.vf-h1{font-size:clamp(38px,6.2vw,68px);line-height:1.02;letter-spacing:-.02em;font-weight:900}
.vf-h2{font-size:clamp(26px,3.6vw,40px);line-height:1.12;letter-spacing:-.02em;font-weight:800}
.vf-h3{font-size:clamp(18px,2.2vw,23px);line-height:1.32;letter-spacing:-.01em;font-weight:700}
.vf-lede{font-size:clamp(15px,1.7vw,18px);line-height:1.8;color:var(--ink-soft);max-width:62ch}
.vf-prose{max-width:64ch;font-size:16px;line-height:1.8}
.vf-prose p+p{margin-top:1em}
.vf-prose a{color:var(--route-500);text-decoration-thickness:1px;text-underline-offset:3px}
.vf-num{font-family:var(--font-mono);font-weight:700;letter-spacing:.02em}

/* ---------- buttons & tags ---------- */
.vf-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:14px;font-weight:600;line-height:1;letter-spacing:.02em;
  padding:13px 20px;border:1px solid transparent;border-radius:var(--radius);
  text-decoration:none;cursor:pointer;
  transition:transform .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.vf-btn:hover{transform:translateY(-2px)}
.vf-btn--solid{background:var(--coral-600);border-color:var(--coral-600);color:#fff}
.vf-btn--solid:hover{filter:brightness(1.08)}
.vf-btn--line{background:transparent;color:var(--sea-700);border-color:var(--line-strong)}
.vf-btn--line:hover{border-color:var(--coral-600);color:var(--coral-600)}
.vf-btn--ghost{background:transparent;color:var(--foam);border-color:var(--line-light)}
.vf-btn--ghost:hover{border-color:var(--coral-300);color:#fff}
.vf-btn--sm{padding:9px 14px;font-size:12.5px}

.vf-tag{display:inline-flex;align-items:center;gap:5px;font-family:var(--font-mono);font-size:11px;line-height:1.5;letter-spacing:.1em;padding:3px 7px;border:1px solid var(--line-strong);border-radius:1px;color:var(--sea-700)}
.vf-tag--sand{background:rgba(217,169,76,.18);border-color:rgba(217,169,76,.7);color:#7d5c19}
.vf-tag--coral{background:rgba(228,87,46,.12);border-color:rgba(228,87,46,.5);color:#a23917}
.vf-tag--tide{background:rgba(47,143,115,.12);border-color:rgba(47,143,115,.5);color:#1d6753}

/* ---------- paper cards ---------- */
.vf-paper{
  position:relative;background:var(--foam);
  border:1px solid var(--line-ink);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,26px);
  box-shadow:var(--shadow-paper);
  transition:transform .18s ease,box-shadow .18s ease;
}
.vf-paper:hover{transform:translateY(-4px);box-shadow:0 2px 0 rgba(16,30,41,.06),0 20px 36px -24px rgba(7,38,61,.62)}
.vf-paper--stack{box-shadow:8px 8px 0 -1px var(--paper),8px 8px 0 0 var(--line-ink)}
.vf-paper__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--route-500);margin-bottom:8px}
.vf-paper__title{font-size:17px;font-weight:700;line-height:1.4;margin-bottom:6px;letter-spacing:-.01em}

/* ---------- media ---------- */
.vf-media{position:relative;overflow:hidden;border:1px solid var(--line-ink);border-radius:var(--radius);background:linear-gradient(160deg,var(--sea-700),var(--route-500) 62%,var(--mist))}
.vf-media--16x9{aspect-ratio:16/9}
.vf-media--4x3{aspect-ratio:4/3}
.vf-media--1x1{aspect-ratio:1/1}
.vf-media__img{width:100%;height:100%;object-fit:cover;display:block}
.vf-media__overlay{
  position:absolute;inset:0;pointer-events:none;
  background:
    repeating-linear-gradient(0deg,rgba(246,243,236,.18) 0 1px,transparent 1px 40px),
    repeating-linear-gradient(90deg,rgba(246,243,236,.18) 0 1px,transparent 1px 40px);
}
.vf-media__caption{position:absolute;left:0;right:0;bottom:0;padding:10px 12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--foam);background:linear-gradient(0deg,rgba(7,38,61,.82),transparent)}

/* ---------- tables ---------- */
.vf-tablescroll{overflow-x:auto;border:1px solid var(--line-ink);background:var(--foam)}
.vf-table{width:100%;min-width:560px;border-collapse:collapse;font-size:14px;line-height:1.6}
.vf-table caption{caption-side:top;text-align:left;padding:12px 14px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--route-500);background:var(--paper);border-bottom:1px solid var(--line-ink)}
.vf-table th{background:var(--sea-700);color:var(--foam);text-align:left;font-size:12px;font-weight:600;letter-spacing:.1em;padding:10px 14px;white-space:nowrap}
.vf-table td{padding:11px 14px;border-bottom:1px solid var(--line-ink);vertical-align:top}
.vf-table tbody tr:nth-child(even){background:rgba(231,225,213,.45)}
.vf-table tbody tr:hover{background:rgba(255,154,118,.16)}
.vf-table tbody tr:last-child td{border-bottom:0}
.vf-table .vf-num{color:var(--sea-700)}

/* ---------- filters ---------- */
.vf-filters{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.vf-filter{
  font:inherit;font-size:13px;letter-spacing:.04em;
  padding:8px 14px;border:1px solid var(--line-strong);border-radius:var(--radius);
  background:transparent;color:var(--sea-700);cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.vf-filter:hover{border-color:var(--coral-600);color:var(--coral-600)}
.vf-filter[aria-pressed="true"]{background:var(--coral-600);border-color:var(--coral-600);color:#fff;font-weight:600}
[data-filter-item][hidden]{display:none !important}

/* ---------- breadcrumbs ---------- */
.vf-crumbs{padding-block:14px;font-size:12px}
.vf-crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px}
.vf-crumbs__item{display:inline-flex;align-items:center;gap:10px;letter-spacing:.06em;color:var(--mist)}
.vf-crumbs__item:not(:last-child)::after{content:"/";color:var(--line-strong)}
.vf-crumbs__link{color:var(--route-500);text-decoration:none;border-bottom:1px solid transparent}
.vf-crumbs__link:hover{border-bottom-color:currentColor}

/* ---------- notes & rail ---------- */
.vf-note{position:relative;border-left:2px solid var(--sand);background:rgba(231,225,213,.5);padding:12px 14px;font-size:13px;line-height:1.75;color:var(--ink-soft)}
.vf-note__label{display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:#7d5c19;margin-bottom:4px}
.vf-aside{font-size:13px;line-height:1.8;color:var(--mist);border-top:1px solid var(--line-ink);padding-top:10px}
.vf-rail{position:sticky;top:calc(var(--header-h) + 16px);display:grid;gap:2px;font-size:12px}
.vf-rail__link{display:block;padding:6px 10px;color:var(--mist);text-decoration:none;border-left:2px solid transparent;letter-spacing:.06em;transition:color .18s ease,background .18s ease,border-color .18s ease}
.vf-rail__link:hover{color:var(--sea-700)}
.vf-rail__link[aria-current="true"]{color:var(--sea-900);font-weight:700;border-left-color:var(--coral-600);background:rgba(255,154,118,.16)}

/* ---------- reveal ---------- */
.js-reveal [data-reveal]{opacity:0;transform:translateY(12px)}
.js-reveal [data-reveal].is-in{opacity:1;transform:none;transition:opacity .5s ease,transform .5s ease}

/* ---------- responsive ---------- */
@media (max-width:1080px) and (min-width:881px){
  .vf-nav__link{padding:8px 6px;font-size:13px}
  .vf-nav__link::before{display:none}
  .vf-batch__state{display:none}
  .vf-quick__link--store{display:none}
}

@media (max-width:880px){
  .vf-navtoggle{display:inline-flex}
  .vf-batch{border-left:0;padding-left:0}
  .vf-batch__state{display:none}
  .vf-brand__sub{display:none}
  .vf-quick{margin-left:auto}
  .vf-quick__link--store{display:none}
  .vf-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    margin:0;padding:8px var(--pad) 18px;
    background:var(--sea-900);
    border-top:1px solid var(--line-light);
    border-bottom:1px solid var(--line-light);
    box-shadow:0 26px 44px -32px rgba(0,0,0,.85);
  }
  .vf-header[data-open] .vf-nav{display:flex;animation:vf-nav-in .18s ease-out}
  .vf-nav__link{padding:13px 6px;font-size:15px;border-bottom:1px solid rgba(246,243,236,.1)}
  .vf-nav__link:hover{background:rgba(246,243,236,.05)}
  .vf-nav__link[aria-current="page"]{border-bottom-color:rgba(246,243,236,.1);background:rgba(228,87,46,.14);box-shadow:inset 3px 0 0 var(--coral-600)}
  .vf-grid--2,.vf-grid--3,.vf-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .vf-grid--offset>*{margin-top:0}
  .vf-rail{position:static;grid-auto-flow:column;grid-auto-columns:max-content;overflow-x:auto;padding-bottom:6px}
  .vf-footer__grid{grid-template-columns:1fr 1fr;gap:28px}
}

@media (max-width:620px){
  .vf-grid--2,.vf-grid--3,.vf-grid--4{grid-template-columns:1fr}
  .vf-footer__grid{grid-template-columns:1fr}
  .vf-footer__seal{display:none}
  .vf-footer__tagline,.vf-footer__note{max-width:44ch}
  .vf-footer__bottom{flex-direction:column;align-items:flex-start}
}

@media (max-width:420px){
  .vf-brand__name{font-size:14px}
  .vf-brand__mark{width:26px;height:26px}
  .vf-quick__link{padding:6px 9px;font-size:12px}
  .vf-navtoggle{padding:7px 8px}
}

@keyframes vf-nav-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

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