*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg{display:block;max-width:100%}
button,input{font:inherit;color:inherit}
a{color:inherit}

:root{
  --cream:#F6F0E4;
  --paper:#FFFDF8;
  --ink:#10271F;
  --nav:#123D2E;
  --orange:#FF5A1F;
  --orange-mist:#FFD9C7;
  --lime:#C8FF3D;
  --teal:#00B8A9;
  --violet:#6C5CE7;
  --line:#E7E2D6;
  --muted:#5A6B63;
  --r-s:10px;
  --r-m:16px;
  --r-l:26px;
  --wrap:1200px;
  --gutter:clamp(16px,4vw,32px);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-display);
  --font-index:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-1:0 1px 0 rgba(16,39,31,.05),0 14px 30px rgba(16,39,31,.06);
  --shadow-2:0 26px 54px rgba(16,39,31,.18);
}

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

h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.14;letter-spacing:.02em}
h1{font-size:clamp(40px,6.4vw,96px)}
h2{font-size:clamp(28px,4vw,52px)}
h3{font-size:clamp(20px,2.4vw,26px)}
p{max-width:64ch}
strong{font-weight:900}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(40px,7vw,88px)}
.section--tight{padding-block:clamp(24px,4vw,48px)}
.section--ink{background:var(--nav);color:var(--paper)}
.prose{max-width:68ch}
.prose>*+*{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.6em}
.prose ul,.prose ol{list-style:disc;padding-left:1.25em;margin-top:.8em}
.prose a{text-decoration-color:var(--teal);text-underline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr))}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-display);font-weight:700;font-size:14px;letter-spacing:.04em;
  text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:transform .16s ease,background .18s ease,border-color .18s ease,color .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--orange{background:var(--orange);color:var(--ink)}
.btn--orange:hover{background:#FF743F}
.btn--lime{background:var(--lime);color:var(--ink)}
.btn--lime:hover{background:#D6FF6B}
.btn--ink{background:var(--ink);color:var(--paper)}
.btn--ink:hover{background:#1B3A30}
.btn--ghost{border-color:rgba(16,39,31,.24);color:var(--ink);background:transparent}
.btn--ghost:hover{border-color:var(--ink)}
.btn--ghost-light{border-color:rgba(255,253,248,.42);color:var(--paper);background:transparent}
.btn--ghost-light:hover{border-color:var(--lime);color:var(--lime)}

.chip{
  display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;
  font-family:var(--font-index);font-size:11px;letter-spacing:.08em;
  background:var(--orange-mist);color:var(--ink);
}
.chip--lime{background:var(--lime);color:var(--ink)}
.chip--orange{background:var(--orange);color:var(--ink)}
.chip--violet{background:var(--violet);color:var(--paper)}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-index);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--orange)}
.section-title{font-size:clamp(26px,3.6vw,44px)}
.lede{font-size:clamp(17px,1.6vw,20px);font-weight:300;line-height:1.7;color:var(--muted);max-width:60ch}
.num-anchor{font-family:var(--font-index);font-size:clamp(34px,6vw,72px);font-weight:700;letter-spacing:-.02em;line-height:1;color:var(--orange)}
.rule{border:0;border-top:1px solid var(--line);margin-block:clamp(24px,4vw,48px)}

.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-l);
  padding:clamp(18px,2.6vw,28px);box-shadow:var(--shadow-1);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.card:hover{transform:translateY(-3px);border-color:rgba(0,184,169,.5);box-shadow:var(--shadow-2)}
.card--glass{background:rgba(255,253,248,.14);border-color:rgba(255,253,248,.28);backdrop-filter:blur(10px);color:var(--paper);box-shadow:none}
.card--ink{background:var(--nav);color:var(--paper);border-color:transparent}

.media-frame{position:relative;display:block;overflow:hidden;border-radius:var(--r-l);background:var(--line);aspect-ratio:4/3}
.media-frame__img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame__cap{
  position:absolute;left:12px;bottom:12px;
  padding:4px 10px;border-radius:999px;
  font-family:var(--font-index);font-size:10px;letter-spacing:.1em;
  background:rgba(16,39,31,.72);color:var(--paper);
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--round{aspect-ratio:1;border-radius:50%}

.crumbs{margin-top:18px}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-index);font-size:11px;letter-spacing:.1em;color:var(--muted)}
.crumbs__link{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--teal)}
.crumbs__link:hover{background:var(--lime)}
.crumbs__sep{color:var(--teal)}
.crumbs__current{color:var(--muted)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--nav);color:var(--paper);
  border-bottom:1px solid rgba(255,253,248,.16);
}
.scroll-progress{
  position:absolute;left:0;top:0;height:3px;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--orange),var(--lime));
  z-index:5;
}
.skip-link{
  position:absolute;left:14px;top:-64px;z-index:200;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--lime);color:var(--ink);
  font-weight:700;font-size:14px;text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus{top:0}

.cmdbar{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:"brand search meta";
  align-items:center;
  gap:clamp(10px,2vw,22px);
  padding-block:13px;
  position:relative;
}
.brand{
  grid-area:brand;
  display:inline-flex;align-items:baseline;gap:8px;
  text-decoration:none;color:var(--paper);
  font-weight:900;font-size:20px;letter-spacing:.08em;white-space:nowrap;
}
.brand__sub{
  font-family:var(--font-index);font-size:11px;font-weight:400;
  letter-spacing:.16em;color:rgba(255,253,248,.66);
}
.brand__dot{
  width:8px;height:8px;border-radius:50%;align-self:center;
  background:var(--orange);box-shadow:0 0 0 4px rgba(255,90,31,.22);
}
.brand:focus-visible{outline:2px solid var(--lime);outline-offset:4px}

.cmdbar__search{grid-area:search;position:relative;min-width:0}
.cmd-search{
  display:flex;align-items:center;gap:8px;
  height:38px;padding:0 14px;border-radius:999px;
  background:rgba(255,253,248,.09);
  border:1px solid rgba(255,253,248,.22);
  backdrop-filter:blur(8px);
  transition:border-color .18s ease,background .18s ease,box-shadow .18s ease;
}
.cmd-search:focus-within{
  border-color:var(--teal);
  background:rgba(255,253,248,.15);
  box-shadow:0 0 0 3px rgba(0,184,169,.22);
}
.cmd-search__hint{font-family:var(--font-index);font-size:12px;color:var(--lime)}
.cmd-search__input{
  flex:1;min-width:0;background:none;border:0;outline:none;
  color:var(--paper);font-family:var(--font-body);font-size:14px;letter-spacing:.02em;
}
.cmd-search__input::placeholder{color:rgba(255,253,248,.5)}
.cmd-search__input::-webkit-search-decoration,
.cmd-search__input::-webkit-search-cancel-button{-webkit-appearance:none;appearance:none}

.cmdpalette{
  position:absolute;left:0;right:0;top:calc(100% + 10px);z-index:90;
  display:none;
  min-width:min(340px,calc(100vw - 32px));
  padding:10px;
  border-radius:var(--r-m);
  border:1px solid rgba(255,253,248,.22);
  background:rgba(18,61,46,.97);
  box-shadow:0 24px 52px rgba(16,39,31,.42);
  backdrop-filter:blur(14px);
  max-height:min(62vh,420px);overflow:auto;
}
.cmdpalette[data-open="true"]{display:block}
.cmdpalette__head{
  display:flex;justify-content:space-between;align-items:center;
  padding:4px 12px 8px;
  font-family:var(--font-index);font-size:11px;letter-spacing:.14em;
  color:rgba(255,253,248,.52);
}
.cmdpalette__item{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:9px 12px;border-radius:var(--r-s);
  text-decoration:none;font-size:14px;
  color:rgba(255,253,248,.86);
  transition:background .16s ease,color .16s ease;
}
.cmdpalette__item:hover,.cmdpalette__item:focus-visible{background:rgba(255,253,248,.12);color:var(--paper)}
.cmdpalette__item[aria-current="page"]{background:var(--lime);color:var(--ink);font-weight:700}
.cmdpalette__name{white-space:nowrap}
.cmdpalette__path{font-family:var(--font-index);font-size:11px;letter-spacing:.04em;color:var(--teal)}
.cmdpalette__item[aria-current="page"] .cmdpalette__path{color:rgba(16,39,31,.72)}
.cmdpalette__empty{padding:10px 12px;font-size:13px;line-height:1.6;color:var(--orange-mist)}

.cmdbar__meta{grid-area:meta;display:flex;align-items:center;gap:10px;justify-self:end}
.ver-chip{
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
  padding:5px 11px;border-radius:999px;
  border:1px solid rgba(200,255,61,.42);
  font-family:var(--font-index);font-size:11px;letter-spacing:.06em;
  color:rgba(255,253,248,.82);
}
.ver-chip__no{color:var(--lime);font-weight:700}
.cmdbar__cta{padding:8px 16px;font-size:13px}

.nav-toggle{
  display:none;align-items:center;gap:7px;
  padding:8px 12px;border-radius:999px;
  border:1px solid rgba(255,253,248,.34);
  background:rgba(255,253,248,.08);
  color:var(--paper);font-size:12px;letter-spacing:.12em;cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.nav-toggle:hover{background:rgba(255,253,248,.18)}
.nav-toggle[aria-expanded="true"]{background:var(--lime);border-color:var(--lime);color:var(--ink)}
.nav-toggle__bar{display:block;width:2px;height:11px;background:currentColor;border-radius:1px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}

.cmdnav{
  position:relative;
  border-top:1px solid rgba(255,253,248,.14);
  background:rgba(16,39,31,.36);
}
.cmdnav__list{
  display:flex;flex-wrap:wrap;gap:4px;
  max-width:var(--wrap);margin-inline:auto;
  padding:6px var(--gutter);
}
.cmdnav__link{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  color:rgba(255,253,248,.78);text-decoration:none;
  font-size:14px;font-weight:500;letter-spacing:.04em;
  transition:background .18s ease,color .18s ease;
}
.cmdnav__link:hover{background:rgba(255,253,248,.12);color:var(--paper)}
.cmdnav__idx{font-family:var(--font-index);font-size:10px;letter-spacing:.08em;color:var(--teal)}
.cmdnav__link[aria-current="page"]{background:var(--orange);color:var(--ink);font-weight:700}
.cmdnav__link[aria-current="page"] .cmdnav__idx{color:rgba(16,39,31,.62)}
.cmdnav__link:focus-visible{outline:2px solid var(--lime);outline-offset:2px}

/* ---------- footer ---------- */
.site-footer{
  background:var(--nav);color:var(--paper);
  border-top:3px solid var(--orange);
  padding-block:clamp(36px,6vw,68px) 24px;
}
.foot__inner{display:flex;flex-direction:column;gap:clamp(24px,4vw,44px)}
.foot__top{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:14px}
.foot__brandline{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(20px,3vw,34px);line-height:1.3;letter-spacing:.02em;
  max-width:22ch;
}
.foot__ver{
  font-family:var(--font-index);font-size:11px;letter-spacing:.14em;
  padding:5px 11px;border-radius:999px;
  border:1px solid rgba(200,255,61,.42);color:var(--lime);
}
.foot__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr)) 1.35fr;
  gap:clamp(20px,3vw,44px);
}
.foot__coltitle{
  font-family:var(--font-index);font-size:11px;font-weight:600;
  letter-spacing:.18em;color:var(--lime);margin-bottom:12px;
}
.foot__list{display:flex;flex-direction:column;gap:2px}
.foot__link{
  display:inline-block;padding:4px 0;font-size:15px;
  color:rgba(255,253,248,.82);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.foot__link:hover{color:var(--paper);border-bottom-color:var(--teal)}
.foot__link:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.foot__line{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:14px;line-height:1.6;color:rgba(255,253,248,.84);
  word-break:break-word;
}
.foot__key{
  font-family:var(--font-index);font-size:10px;letter-spacing:.14em;
  color:var(--teal);min-width:32px;
}
.foot__note{
  margin-top:12px;max-width:38ch;
  font-size:12.5px;line-height:1.65;color:rgba(255,253,248,.62);
}
.copy-btn{
  font-family:var(--font-index);font-size:11px;letter-spacing:.08em;
  padding:2px 9px;border-radius:999px;cursor:pointer;
  border:1px solid rgba(255,253,248,.32);background:transparent;color:var(--paper);
  transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.copy-btn:hover{background:var(--lime);border-color:var(--lime);color:var(--ink)}
.copy-btn:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.copy-note{
  min-height:1.5em;margin-top:8px;
  font-family:var(--font-index);font-size:11px;letter-spacing:.05em;
  color:var(--lime);
}
.foot__bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  border-top:1px solid rgba(255,253,248,.16);
  padding-top:18px;
  font-size:12px;color:rgba(255,253,248,.6);
}
.foot__legal,.foot__fine{font-family:var(--font-index);letter-spacing:.06em;margin:0}

/* ---------- motion ---------- */
.has-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s ease,transform .6s ease;
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

@media (max-width:860px){
  .nav-toggle{display:inline-flex}
  .ver-chip{display:none}
  .cmdnav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    border-top:0;border-bottom:1px solid rgba(255,253,248,.18);
    background:var(--nav);
    box-shadow:0 26px 42px rgba(16,39,31,.42);
  }
  .cmdnav[data-open="true"]{display:block}
  .cmdnav__list{flex-direction:column;gap:2px;padding:10px var(--gutter) 16px}
  .cmdnav__link{width:100%;padding:12px 10px;border-radius:var(--r-s);font-size:16px}
  .cmdnav__idx{font-size:11px}
  .col-4,.col-5,.col-7,.col-8{grid-column:span 12}
  .foot__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:760px){
  .cmdbar{
    grid-template-columns:auto 1fr;
    grid-template-areas:"brand meta" "search search";
    padding-block:11px;
  }
  .brand{font-size:18px}
  .brand__sub{display:none}
  .cmdpalette{left:0;right:0;min-width:0}
}

@media (max-width:620px){
  .cmdbar__cta{display:none}
  .foot__cols{grid-template-columns:minmax(0,1fr)}
  .foot__brandline{font-size:19px}
  .foot__bottom{flex-direction:column;gap:6px}
}

@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}
  .btn:hover,.card:hover{transform:none}
}