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

:root{
  --ink:#0F3D2E;
  --ink-deep:#0A2A20;
  --ink-mid:#1C5A44;
  --lime:#C6FF3D;
  --orange:#FF7A3D;
  --orange-soft:#FFD3B8;
  --paper:#F1F6EE;
  --indigo:#2E2A6E;
  --wine:#6E2E3A;
  --gray:#9FB8AC;
  --indigo-lit:#867CE8;
  --wine-lit:#C9596E;
  --line:rgba(159,184,172,.24);
  --line-soft:rgba(159,184,172,.12);
  --line-strong:rgba(159,184,172,.44);
  --font-head:'Barlow Condensed','Oswald','Noto Sans SC',sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono','Noto Sans Mono CJK SC',monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --rail-w:88px;
  --topbar-h:56px;
  --gutter:clamp(16px,4vw,40px);
}

::selection{background:var(--lime);color:var(--ink-deep)}
:focus-visible{outline:2px solid var(--lime);outline-offset:2px}

body{
  min-height:100vh;
  padding-top:var(--topbar-h);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(159,184,172,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(159,184,172,.055) 1px,transparent 1px);
  background-size:52px 52px,52px 52px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:300;line-height:1.1;letter-spacing:-.02em}
h1{font-size:clamp(44px,8vw,88px);font-weight:200}
h2{font-size:clamp(30px,4.6vw,52px)}
h3{font-size:clamp(20px,2.6vw,24px);font-weight:400}
h4{font-size:18px;font-weight:500}
p{text-wrap:pretty}

/* ---------- utilities ---------- */
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 var(--gutter)}
.prose{max-width:68ch;font-size:16px;line-height:1.75}
.prose p{margin-bottom:1em}
.mono{font-family:var(--font-mono);font-variant-ligatures:none}
.label{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--gray)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--lime)}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--lime);flex:0 0 auto}
.rule{height:1px;border:0;background:var(--line);margin:0}
.section{padding:clamp(48px,7vw,96px) 0}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;margin-bottom:clamp(20px,3vw,32px)}
.section__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.18em;color:var(--lime)}
.section__title{font-size:clamp(26px,3.6vw,44px)}
.grid{display:grid;gap:clamp(20px,3vw,36px);grid-template-columns:minmax(0,1fr)}
.grid>*{min-width:0}
@media(min-width:760px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(min-width:1000px){
  .grid--aside{grid-template-columns:minmax(0,2fr) minmax(0,3fr)}
}
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:20px 0 0;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--gray)}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--line-strong)}
.breadcrumbs a{text-decoration:none;color:var(--gray)}
.breadcrumbs a:hover{color:var(--lime)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}
.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--lime);margin-right:8px;vertical-align:middle}
.status-dot[data-state="warn"]{background:var(--orange)}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;border:1px solid var(--line-strong);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--paper)}
.sticker{display:inline-block;transform:rotate(-2deg);padding:5px 10px;background:var(--lime);color:var(--ink-deep);font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase}
.hl{background:linear-gradient(transparent 58%,rgba(198,255,61,.38) 58%);padding:0 2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border:1px solid var(--line-strong);background:rgba(28,90,68,.32);color:var(--paper);font-size:13px;letter-spacing:.08em;text-decoration:none;cursor:pointer;transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease)}
.btn:hover{background:rgba(28,90,68,.78);border-color:var(--lime);color:var(--lime)}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#1A0C05;font-weight:500}
.btn--primary:hover{background:var(--orange-soft);border-color:var(--orange-soft);color:#2A1206}
.btn--ghost{background:transparent}
.figure{position:relative;display:block;width:100%;margin:0;background:var(--ink-mid);border:1px solid var(--line);overflow:hidden}
.figure__img{width:100%;height:100%;object-fit:cover;display:block}
.figure__inner{position:absolute;inset:0;display:grid;place-items:center;padding:16px}
.figure__cap{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--gray)}
.figure--wide{aspect-ratio:16/9}
.figure--tall{aspect-ratio:4/5}
.figure--square{aspect-ratio:1/1}
.figure--diagram{aspect-ratio:3/2;background-color:var(--ink-deep);background-image:linear-gradient(rgba(159,184,172,.1) 1px,transparent 1px),linear-gradient(90deg,rgba(159,184,172,.1) 1px,transparent 1px);background-size:24px 24px,24px 24px}
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- skip link ---------- */
.skip-link{position:fixed;top:8px;left:8px;z-index:200;padding:10px 16px;background:var(--lime);color:var(--ink-deep);font-size:13px;letter-spacing:.08em;text-decoration:none;transform:translateY(-180%);transition:transform .18s var(--ease)}
.skip-link:focus{transform:translateY(0)}

/* ---------- header : coordinate rail ---------- */
.site-header{position:relative;z-index:80}
.rail{position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:70;display:flex;flex-direction:column;background:var(--ink-deep);border-right:1px solid var(--line)}
.rail__brand{display:flex;align-items:center;gap:6px;flex:0 0 auto;height:var(--topbar-h);padding:0 10px;border-bottom:1px solid var(--line);text-decoration:none;transition:background-color .18s var(--ease)}
.rail__brand:hover{background:rgba(198,255,61,.08)}
.rail__glyph{display:grid;place-items:center;flex:0 0 auto;width:22px;height:22px;background:var(--lime);color:var(--ink-deep);font-family:var(--font-head);font-weight:600;font-size:15px;line-height:1}
.rail__slug{font-family:var(--font-mono);font-size:9px;line-height:1.12;letter-spacing:.08em;text-transform:uppercase;color:var(--gray)}
.rail__list{flex:1 1 auto;overflow-y:auto;overflow-x:hidden;padding:6px 0}
.rail__item{border-bottom:1px solid var(--line-soft)}
.rail__item:last-child{border-bottom:0}
.rail__link{position:relative;display:block;padding:9px 10px 9px 12px;border-left:2px solid transparent;text-decoration:none;color:var(--gray);transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease)}
.rail__code{display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;color:var(--gray);transition:color .18s var(--ease)}
.rail__name{display:block;font-size:11px;letter-spacing:.04em;line-height:1.45;white-space:nowrap}
.rail__dot{position:absolute;top:12px;right:10px;width:6px;height:6px;border-radius:50%;background:var(--lime);opacity:.6;transition:opacity .18s var(--ease),box-shadow .18s var(--ease)}
.rail__link[data-line="member"] .rail__dot{background:var(--indigo-lit)}
.rail__link[data-line="content"] .rail__dot{background:var(--wine-lit)}
.rail__link[data-line="help"] .rail__dot{background:var(--orange)}
.rail__link[data-line="axis"] .rail__dot{background:var(--lime)}
.rail__link:hover{color:var(--lime);background:rgba(198,255,61,.07);border-left-color:var(--lime)}
.rail__link:hover .rail__code{color:var(--lime)}
.rail__link:hover .rail__dot{opacity:1;box-shadow:0 0 0 3px rgba(198,255,61,.16)}
.rail__link[aria-current="page"]{color:var(--lime);background:rgba(198,255,61,.09);border-left-color:var(--lime)}
.rail__link[aria-current="page"] .rail__code{color:var(--lime)}
.rail__link.is-active{border-left-color:rgba(198,255,61,.55);background:rgba(198,255,61,.04)}
.rail__link.is-active .rail__dot{opacity:1;box-shadow:0 0 0 3px rgba(198,255,61,.18)}
.rail__foot{flex:0 0 auto;display:flex;flex-direction:column;gap:6px;padding:12px 10px;border-top:1px solid var(--line)}
.rail__footlabel{font-size:9px;letter-spacing:.16em}
.rail__ver{font-family:var(--font-mono);font-size:14px;letter-spacing:.08em;color:var(--lime)}
.rail__meter{display:block;position:relative;height:3px;background:rgba(159,184,172,.2);overflow:hidden}
.rail__meter i{display:block;position:absolute;inset:0;width:100%;background:var(--lime);transform:scaleX(0);transform-origin:left center}

/* ---------- header : top bar ---------- */
.topbar{position:fixed;top:0;left:0;right:0;z-index:60;display:flex;align-items:center;gap:12px;height:var(--topbar-h);padding:0 var(--gutter);background:rgba(15,61,46,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.topbar__domain{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--lime);white-space:nowrap}
.topbar__div{width:1px;height:16px;background:var(--line-strong);flex:0 0 auto}
.topbar__badge{padding:3px 7px;border:1px solid var(--line-strong);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--paper);white-space:nowrap}
.topbar__now{margin-left:auto;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--gray);white-space:nowrap}
.topbar__now b{font-weight:400;color:var(--lime)}
.topbar__cta{padding:6px 12px;border:1px solid var(--orange);color:var(--orange);font-size:11px;letter-spacing:.14em;text-decoration:none;white-space:nowrap;transition:background-color .18s var(--ease),color .18s var(--ease)}
.topbar__cta:hover{background:var(--orange);color:#1A0C05}
.topbar__progress{display:none;position:absolute;left:0;bottom:-1px;width:100%;height:2px;background:var(--lime);transform:scaleX(0);transform-origin:left center}
.nav-toggle{display:none;align-items:center;gap:8px;height:34px;padding:0 10px;border:1px solid var(--line-strong);background:rgba(10,42,32,.6);color:var(--paper);font-size:11px;letter-spacing:.16em;text-transform:uppercase;cursor:pointer;transition:border-color .18s var(--ease),color .18s var(--ease)}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime)}
.nav-toggle__icon{display:flex;flex-direction:column;justify-content:center;gap:4px;width:16px;flex:0 0 auto}
.nav-toggle__bar{display:block;width:16px;height:1.5px;background:var(--lime);transition:transform .2s var(--ease)}
.nav-toggle__text{white-space:nowrap}
.site-header[data-open] .nav-toggle__bar:first-child{transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:last-child{transform:translateY(-2.75px) rotate(-45deg)}
.nav-scrim{display:none;position:fixed;inset:0;z-index:65;background:rgba(10,42,32,.72);opacity:0;pointer-events:none;transition:opacity .26s var(--ease)}

@media(max-width:719px){
  .topbar__badge,.topbar__cta{display:none}
}
@media(max-width:560px){
  .topbar__div,.topbar__now{display:none}
}
@media(max-width:899px){
  .nav-toggle{display:inline-flex;margin-left:auto}
  .topbar__progress{display:block}
  .nav-scrim{display:block}
  .site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}
  .rail{width:min(292px,84vw);transform:translateX(-100%);transition:transform .26s var(--ease);box-shadow:32px 0 64px rgba(0,0,0,.55)}
  .site-header[data-open] .rail{transform:translateX(0)}
  .rail__link{padding:13px 14px 13px 16px}
  .rail__code{font-size:11px}
  .rail__name{font-size:13.5px}
  .rail__dot{top:16px;right:14px}
  .rail__brand{padding:0 14px}
  html.nav-open{overflow:hidden}
}
@media(min-width:900px){
  body{padding-left:var(--rail-w)}
  .topbar{left:var(--rail-w);padding:0 clamp(20px,3vw,40px)}
}

/* ---------- footer ---------- */
.site-footer{position:relative;margin-top:clamp(56px,8vw,104px);background-color:var(--ink-deep);border-top:1px solid var(--line);background-image:repeating-linear-gradient(90deg,rgba(159,184,172,.06) 0 1px,transparent 1px 88px)}
.footer__inner{max-width:1180px;margin:0 auto;padding:clamp(40px,6vw,72px) var(--gutter) 24px}
.footer__grid{display:grid;gap:clamp(24px,4vw,44px);grid-template-columns:minmax(0,1fr)}
.footer__grid>*{min-width:0}
@media(min-width:820px){
  .footer__grid{grid-template-columns:1.5fr 1fr 1.2fr}
}
.footer__logo{font-family:var(--font-head);font-size:28px;font-weight:300;letter-spacing:-.01em;color:var(--paper)}
.footer__slug{margin-top:4px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--lime)}
.footer__lede{margin-top:14px;max-width:34ch;font-size:14px;line-height:1.75;color:var(--gray)}
.footer__cta{margin-top:20px}
.footer__contact{margin-top:22px;display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--paper)}
.footer__contact .mono{font-size:12px;letter-spacing:.02em}
.footer__addr{margin-top:12px;max-width:32ch;font-size:12px;line-height:1.7;color:var(--gray)}
.footer__col{border-top:1px solid var(--line);padding-top:20px}
@media(min-width:820px){
  .footer__col{border-top:0;border-left:1px solid var(--line);padding-top:0;padding-left:clamp(16px,2.4vw,28px)}
}
.footer__title{margin-bottom:16px;font-family:var(--font-body);font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--lime)}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{display:inline-flex;align-items:baseline;gap:9px;font-size:14px;text-decoration:none;color:var(--paper);border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.footer__link:hover{color:var(--orange);border-bottom-color:var(--orange)}
.footer__code{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--gray);transition:color .18s var(--ease)}
.footer__link:hover .footer__code{color:var(--orange)}
.footer__note{margin-top:22px;font-size:13px;line-height:1.7;color:var(--gray);max-width:32ch}
.footer__bottom{display:flex;flex-wrap:wrap;gap:8px 24px;align-items:center;justify-content:space-between;margin-top:clamp(32px,5vw,56px);padding-top:18px;border-top:1px solid var(--line)}
.footer__legal{font-size:12px;color:var(--gray)}
.footer__icp{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--gray)}

/* ---------- 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;scroll-behavior:auto!important}
  [data-reveal]{opacity:1;transform:none}
  .rail,.nav-scrim,.site-header[data-open] .rail{transition:none}
}