:root{
  --ink-900:#0E1A2B;
  --ink-700:#1B2E47;
  --blue-500:#2F6E8F;
  --paper-050:#F7F4EF;
  --paper-200:#E4DED4;
  --line-400:#B9B0A2;
  --white:#FDFCFA;
  --amber:#C08A2E;
  --amber-deep:#8A6216;
  --signal:#E05B27;
  --signal-deep:#A8410F;
  --slate:#5C7089;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,"Cascadia Mono",Consolas,"Liberation Mono",monospace;
  --step-0:clamp(1rem,0.96rem + 0.2vw,1.0625rem);
  --step-1:clamp(1.1rem,1.02rem + 0.35vw,1.25rem);
  --step-2:clamp(1.35rem,1.2rem + 0.7vw,1.75rem);
  --step-3:clamp(1.7rem,1.42rem + 1.3vw,2.25rem);
  --step-4:clamp(2.4rem,1.7rem + 3vw,4.2rem);
  --sp-1:8px;
  --sp-2:16px;
  --sp-3:24px;
  --sp-4:32px;
  --sp-5:48px;
  --sp-6:64px;
  --sp-7:96px;
  --shell:1200px;
  --gutter:clamp(16px,4vw,40px);
  --shift:220ms;
  --ease:ease-out;
}
*,*::before,*::after{box-sizing:border-box}
html{line-height:1.5;-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
main{display:block}
#main-content{display:block}
:where(a,button,summary,[tabindex]):focus-visible{outline:2px solid var(--blue-500);outline-offset:3px}
body{
  font-family:var(--font-sans);
  font-size:var(--step-0);
  line-height:1.8;
  color:var(--ink-900);
  background-color:var(--paper-050);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(185,176,162,.24) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(185,176,162,.16) 1px,transparent 1px);
  background-size:88px 88px;
  opacity:.55;
}
h1,h2,h3,h4{font-weight:700;line-height:1.28;letter-spacing:-.02em;color:var(--ink-900)}
h1{font-size:var(--step-4);font-weight:900;line-height:1.12;letter-spacing:-.03em}
h2{font-size:var(--step-3);position:relative;padding-left:16px}
h2::before{content:"";position:absolute;left:0;top:.2em;bottom:.2em;width:3px;background:var(--amber)}
h3{font-size:var(--step-2)}
h4{font-size:var(--step-1)}
strong{font-weight:700}
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter);position:relative;z-index:1}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.04em;font-size:.78rem}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:.72rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--amber-deep)}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--amber)}
.rule{height:1px;border:0;background:var(--line-400);margin:0}
.section{padding-block:clamp(40px,6vw,72px);position:relative}
.section--tight{padding-block:clamp(24px,3vw,40px)}
.prose{max-width:68ch;font-size:var(--step-0);line-height:1.85}
.prose > * + *{margin-top:1.2em}
.prose h2{margin-top:2em}
.prose h3{margin-top:1.8em}
.prose ul,.prose ol{padding-left:1.4em}
.prose ul li{list-style:none;position:relative}
.prose ul li::before{content:"";position:absolute;left:-1.1em;top:.85em;width:6px;height:1px;background:var(--amber)}
.prose ol{list-style:decimal}
.prose blockquote{font-family:var(--font-serif);line-height:1.9;color:var(--ink-700);border-left:3px solid var(--amber);padding-left:20px}
.prose a{color:var(--blue-500);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose a:hover{color:var(--amber-deep)}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:0;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.04em;color:var(--slate)}
.breadcrumb > li{display:inline-flex;align-items:center}
.breadcrumb > li + li::before{content:"/";margin:0 8px;color:var(--line-400)}
.breadcrumb a:hover{color:var(--blue-500)}
.blueprint-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--sp-3)}
.blueprint-grid > *{grid-column:span 12;min-width:0}
.panel{background:var(--paper-200);border:1px solid var(--line-400);padding:var(--sp-3)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 22px;background:var(--ink-900);color:var(--white);border:1px solid var(--ink-900);font-size:.92rem;font-weight:500;letter-spacing:.02em;transition:background-color var(--shift) var(--ease),border-color var(--shift) var(--ease),color var(--shift) var(--ease),transform var(--shift) var(--ease)}
.btn:hover{background:var(--signal);border-color:var(--signal);color:var(--white);transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--ink-900);border-color:var(--line-400)}
.btn--ghost:hover{background:transparent;border-color:var(--amber);color:var(--amber-deep);transform:none}
.btn--mono{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;padding:11px 18px}
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border:1px solid var(--line-400);background:var(--white);color:var(--ink-700);font-family:var(--font-mono);font-size:.7rem;font-weight:500;letter-spacing:.06em;line-height:1.7;text-transform:uppercase}
.tag--amber{border-color:rgba(192,138,46,.55);background:rgba(192,138,46,.1);color:var(--amber-deep)}
.tag--blue{border-color:rgba(47,110,143,.45);background:rgba(47,110,143,.08);color:#265B76}
.tag--signal{border-color:rgba(224,91,39,.5);background:rgba(224,91,39,.09);color:var(--signal-deep)}
.copy-btn{display:inline-flex;align-items:center;gap:6px;margin-top:6px;padding:5px 10px;border:1px solid rgba(185,176,162,.42);background:transparent;color:rgba(247,244,239,.78);font-family:var(--font-mono);font-size:.68rem;letter-spacing:.06em;transition:border-color var(--shift) var(--ease),color var(--shift) var(--ease),background-color var(--shift) var(--ease)}
.copy-btn:hover{border-color:var(--amber);color:var(--amber)}
.copy-btn.is-copied{border-color:var(--signal);color:var(--signal)}
.card{position:relative;display:flex;flex-direction:column;gap:10px;padding:26px 24px 28px;background:var(--white);border:1px solid var(--line-400);transition:border-color var(--shift) var(--ease),transform var(--shift) var(--ease)}
.card::before{content:"";position:absolute;top:0;left:0;width:22px;height:22px;pointer-events:none;background-color:var(--paper-200);background-image:linear-gradient(to bottom right,transparent calc(50% - .5px),var(--line-400) calc(50% - .5px),var(--line-400) calc(50% + .5px),transparent calc(50% + .5px))}
.card:hover{border-color:var(--blue-500);transform:translateY(-2px)}
.card__label{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.card__title{font-size:var(--step-1);font-weight:700;line-height:1.45;letter-spacing:-.01em}
.card__text{font-size:.94rem;line-height:1.8;color:var(--ink-700);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.media-frame{position:relative;width:100%;aspect-ratio:16/10;background:var(--paper-200);border:1px solid var(--line-400);overflow:hidden}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(to right,rgba(185,176,162,.35) 1px,transparent 1px),linear-gradient(to bottom,rgba(185,176,162,.28) 1px,transparent 1px);background-size:56px 56px}
.media-frame img,.media-frame > .media-frame__placeholder{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:12px 0;border-top:1px solid var(--line-400);border-bottom:1px solid var(--line-400)}
.filter-btn{padding:7px 14px;border:1px solid var(--line-400);background:var(--white);color:var(--ink-700);font-size:.82rem;letter-spacing:.02em;transition:background-color var(--shift) var(--ease),border-color var(--shift) var(--ease),color var(--shift) var(--ease)}
.filter-btn:hover{border-color:var(--blue-500);color:var(--blue-500)}
.filter-btn[aria-pressed="true"]{background:var(--ink-900);border-color:var(--ink-900);color:var(--white)}
.filter-status{margin-left:auto;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;color:var(--slate)}
[data-filter-item][hidden]{display:none}
.accordion{border:1px solid var(--line-400);background:var(--white)}
.accordion + .accordion{margin-top:-1px}
.accordion > summary{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:16px 20px;background:var(--paper-200);font-weight:500;font-size:.98rem;cursor:pointer;list-style:none}
.accordion > summary::-webkit-details-marker{display:none}
.accordion > summary::after{content:"+";font-family:var(--font-mono);font-size:1rem;color:var(--amber-deep);line-height:1;flex:0 0 auto}
.accordion[open] > summary{background:var(--white);border-bottom:1px solid var(--line-400)}
.accordion[open] > summary::after{content:"–"}
.accordion__body{padding:18px 20px 22px;font-size:.94rem;line-height:1.85;color:var(--ink-700)}
.timeline{position:relative}
.timeline__item{position:relative;display:grid;grid-template-columns:96px 1px minmax(0,1fr);gap:0 20px;padding-bottom:var(--sp-4)}
.timeline__item:last-child{padding-bottom:0}
.timeline__no{font-family:var(--font-mono);font-size:.74rem;font-weight:500;letter-spacing:.06em;color:var(--amber-deep);text-align:right;padding-top:2px}
.timeline__line{position:relative;background:var(--line-400)}
.timeline__line::before{content:"";position:absolute;top:4px;left:-4px;width:9px;height:9px;background:var(--white);border:1px solid var(--ink-700)}
.timeline__body{min-width:0;padding-bottom:4px}
.toc{position:sticky;top:96px;font-size:.86rem}
.toc__title{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--slate);margin-bottom:12px}
.toc a{display:block;padding:7px 0 7px 12px;border-left:2px solid var(--line-400);color:var(--ink-700);line-height:1.6;transition:border-color var(--shift) var(--ease),color var(--shift) var(--ease),background-color var(--shift) var(--ease)}
.toc a:hover{border-left-color:var(--blue-500);color:var(--blue-500)}
.toc a.is-active,.toc a[aria-current]{border-left-color:var(--amber);background:rgba(192,138,46,.07);color:var(--ink-900);font-weight:500}
.rail{position:sticky;top:96px;align-self:start;width:88px;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;color:var(--slate)}
.skip-link{position:absolute;left:8px;top:-72px;z-index:200;padding:10px 18px;background:var(--ink-900);color:var(--white);font-size:.86rem;transition:top 200ms var(--ease)}
.skip-link:focus{top:8px}
.scroll-meter{position:fixed;top:0;left:0;width:100%;height:3px;z-index:120;pointer-events:none}
.scroll-meter::after{content:"";display:block;height:100%;transform-origin:0 50%;transform:scaleX(var(--progress,0));background:linear-gradient(90deg,var(--blue-500),var(--amber) 72%,var(--signal))}
.site-header{position:relative;z-index:60}
.masthead{background:var(--ink-900);color:var(--paper-200)}
.masthead__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;min-height:46px;padding-block:9px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--white);font-weight:700;font-size:.98rem;letter-spacing:-.01em}
.brand__mark{position:relative;flex:0 0 auto;width:12px;height:12px;border:1px solid var(--amber)}
.brand__mark::after{content:"";position:absolute;inset:3px;background:var(--amber)}
.brand__name{white-space:nowrap}
.brand__sep{color:var(--amber)}
.brand__desc{font-size:.78rem;font-weight:400;letter-spacing:.02em;color:rgba(247,244,239,.62)}
.brand:hover .brand__desc{color:rgba(247,244,239,.86)}
.masthead__meta{display:flex;align-items:center;gap:9px;font-size:.72rem;color:rgba(247,244,239,.72)}
.masthead__index{color:var(--paper-200);border:1px solid rgba(185,176,162,.35);padding:2px 8px;font-size:.7rem}
.status-dot{width:7px;height:7px;flex:0 0 auto;background:var(--signal);box-shadow:0 0 0 2px rgba(224,91,39,.22)}
.masthead__state{letter-spacing:.06em}
.navband{position:sticky;top:0;z-index:50;background:rgba(247,244,239,.97);border-bottom:1px solid var(--line-400)}
.navband__inner{display:flex;align-items:stretch;justify-content:space-between;gap:16px}
.index-nav{min-width:0}
.index-nav__list{display:flex;flex-wrap:nowrap;gap:2px}
.index-nav a{display:inline-flex;align-items:center;gap:8px;padding:15px 14px 13px;border-bottom:3px solid transparent;color:var(--ink-700);font-size:.95rem;font-weight:500;white-space:nowrap;transition:color var(--shift) var(--ease),border-color var(--shift) var(--ease),background-color var(--shift) var(--ease)}
.index-nav a:hover{color:var(--blue-500);background:rgba(47,110,143,.07)}
.index-nav a[aria-current="page"]{color:var(--ink-900);border-bottom-color:var(--amber);font-weight:700}
.index-nav__no{font-family:var(--font-mono);font-size:.66rem;font-weight:500;letter-spacing:.06em;color:var(--slate)}
.index-nav a[aria-current="page"] .index-nav__no{color:var(--amber-deep)}
.nav-toggle{display:none;align-items:center;gap:10px;padding:14px 0;color:var(--ink-700);font-size:.85rem;font-weight:500;letter-spacing:.06em}
.nav-toggle__bars{position:relative;display:block;width:20px;height:2px;background:currentColor}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:20px;height:2px;background:currentColor}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-drawer{position:fixed;inset:0;z-index:90;display:flex;align-items:flex-end;background:rgba(14,26,43,.58);opacity:0;visibility:hidden;transition:opacity var(--shift) var(--ease),visibility 0s linear var(--shift)}
.nav-drawer[data-open]{opacity:1;visibility:visible;transition:opacity var(--shift) var(--ease),visibility 0s}
.nav-drawer__panel{width:100%;max-height:86vh;overflow-y:auto;padding:22px var(--gutter) 28px;background:var(--paper-050);border-top:3px solid var(--amber);transform:translateY(100%);transition:transform var(--shift) var(--ease)}
.nav-drawer[data-open] .nav-drawer__panel{transform:none}
.nav-drawer__head{margin-block:14px 8px;color:var(--slate);font-size:.66rem;letter-spacing:.14em}
.nav-drawer__list{display:grid;gap:0;border-top:1px solid var(--line-400)}
.nav-drawer__list li{border-bottom:1px solid var(--line-400)}
.nav-drawer__list a{display:flex;align-items:center;gap:12px;padding:13px 4px;color:var(--ink-900);font-size:1rem;font-weight:500}
.nav-drawer__list a:hover{color:var(--blue-500)}
.nav-drawer__list a[aria-current="page"]{color:var(--amber-deep);font-weight:700;box-shadow:inset 3px 0 0 var(--amber);padding-left:12px}
.nav-drawer__no{color:var(--slate);font-size:.68rem}
.nav-drawer__secondary{display:flex;flex-wrap:wrap;gap:10px 20px;padding-bottom:18px}
.nav-drawer__secondary a{font-size:.88rem;color:var(--ink-700);border-bottom:1px solid var(--line-400);padding-bottom:2px}
.nav-drawer__secondary a:hover{color:var(--blue-500);border-bottom-color:var(--blue-500)}
.nav-drawer__close{width:100%;margin-top:6px}
html.nav-open,html.nav-open body{overflow:hidden}
.site-footer{position:relative;margin-top:clamp(48px,7vw,96px);background:var(--ink-900);color:rgba(247,244,239,.78)}
.site-footer::before{content:"";position:absolute;inset:0 0 auto;height:2px;background:linear-gradient(90deg,var(--amber),rgba(192,138,46,.15) 55%,transparent)}
.footer__top{display:grid;gap:var(--sp-5);padding-block:var(--sp-6) var(--sp-5)}
.footer__brand-link{display:inline-flex;align-items:center;gap:10px;color:var(--white);font-weight:700;font-size:1.05rem}
.footer__tagline{margin-top:14px;max-width:36ch;font-size:.9rem;line-height:1.8;color:rgba(247,244,239,.66)}
.footer__code{margin-top:16px;font-size:.72rem;letter-spacing:.1em;color:rgba(192,138,46,.9)}
.footer__cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--sp-4);padding-top:var(--sp-4);border-top:1px solid rgba(185,176,162,.22)}
.footer__title{padding-left:0;margin-bottom:14px;font-family:var(--font-mono);font-size:.72rem;font-weight:500;letter-spacing:.12em;color:var(--amber);text-transform:uppercase}
.footer__title::before{display:none}
.footer__list li + li{margin-top:10px}
.footer__list a{font-size:.9rem;color:rgba(247,244,239,.82);border-bottom:1px solid transparent;padding-bottom:1px;transition:color var(--shift) var(--ease),border-color var(--shift) var(--ease)}
.footer__list a:hover{color:var(--amber);border-bottom-color:var(--amber)}
.footer__contact-row{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px;margin-top:10px;font-size:.88rem}
.footer__contact-row:first-of-type{margin-top:0}
.footer__contact-key{font-size:.64rem;letter-spacing:.12em;color:var(--slate)}
.footer__contact-val{color:rgba(247,244,239,.9);word-break:break-all}
.footer__contact-note{margin-top:16px;font-size:.78rem;line-height:1.75;color:rgba(247,244,239,.6)}
.footer__bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding-block:20px 28px;border-top:1px solid rgba(185,176,162,.22);font-size:.8rem;color:rgba(247,244,239,.6)}
.footer__legal .mono{font-size:.72rem;color:rgba(247,244,239,.72)}
.footer__bottom-actions{display:flex;align-items:center;gap:14px}
.footer__version{font-size:.7rem;letter-spacing:.1em;color:rgba(185,176,162,.85)}
.footer__totop{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border:1px solid rgba(185,176,162,.38);color:rgba(247,244,239,.85);font-size:.78rem;letter-spacing:.04em;transition:border-color var(--shift) var(--ease),color var(--shift) var(--ease)}
.footer__totop:hover{border-color:var(--amber);color:var(--amber)}
.reveal-on [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity var(--shift) var(--ease),transform var(--shift) var(--ease)}
.reveal-on [data-reveal].is-in{opacity:1;transform:none}
.reveal-on [data-reveal-delay="1"]{transition-delay:60ms}
.reveal-on [data-reveal-delay="2"]{transition-delay:120ms}
.reveal-on [data-reveal-delay="3"]{transition-delay:180ms}
.reveal-on [data-reveal-delay="4"]{transition-delay:240ms}
@media (min-width:640px){
  .blueprint-grid{gap:var(--sp-3)}
}
@media (min-width:640px) and (max-width:1023px){
  .span-3,.span-4,.span-5,.span-6,.span-7{grid-column:span 6}
  .span-8,.span-9,.span-12{grid-column:span 12}
}
@media (min-width:1024px){
  .span-3{grid-column:span 3}
  .span-4{grid-column:span 4}
  .span-5{grid-column:span 5}
  .span-6{grid-column:span 6}
  .span-7{grid-column:span 7}
  .span-8{grid-column:span 8}
  .span-9{grid-column:span 9}
  .span-12{grid-column:span 12}
  .footer__top{grid-template-columns:minmax(0,268px) minmax(0,1fr);gap:var(--sp-6)}
  .footer__cols{grid-template-columns:repeat(4,minmax(0,1fr));padding-top:0;border-top:0}
}
@media (min-width:640px) and (max-width:1023px){
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:1023px){
  .rail{display:none}
  .toc{position:static;top:auto}
}
@media (max-width:900px){
  .index-nav{display:none}
  .nav-toggle{display:inline-flex}
  .navband__inner{justify-content:flex-end}
  .brand__desc{display:none}
  .masthead__state{display:none}
}
@media (max-width:639px){
  h2{padding-left:12px}
  .footer__cols{grid-template-columns:1fr;gap:var(--sp-3)}
  .footer__col + .footer__col{padding-top:var(--sp-3);border-top:1px solid rgba(185,176,162,.18)}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:12px}
  .filter-status{margin-left:0;width:100%}
  .timeline__item{grid-template-columns:64px 1px minmax(0,1fr);gap:0 14px}
  .timeline__no{font-size:.66rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;transition-delay:0ms !important}
  .reveal-on [data-reveal]{opacity:1;transform:none}
}