*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:24px}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{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;cursor:pointer}
input{font:inherit;color:inherit}
:root{
  --ink-900:#061428;
  --ink-800:#0B1F3A;
  --ink-700:#16345C;
  --orange:#FF6B35;
  --orange-soft:#FFB494;
  --teal:#00C2A8;
  --teal-deep:#00796A;
  --paper:#F4F7FB;
  --graphite:#22304A;
  --steel:#9AAEC9;
  --rule:rgba(154,174,201,.26);
  --rule-strong:rgba(154,174,201,.48);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --gutter:40px;
  --gap:24px;
  --page-max:1280px;
  --rail:240px;
  --ease:cubic-bezier(.22,.7,.28,1);
}
body{
  background:var(--ink-800);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.18}
h1{font-size:clamp(2.4rem,6vw,5.5rem);letter-spacing:-.03em}
h2{font-size:clamp(1.6rem,3vw,2.6rem)}
h3{font-size:1.25rem}
strong{font-weight:700}
.wrap{width:100%;max-width:var(--page-max);margin-inline:auto;padding-inline:var(--gutter)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--steel)}
.skip-link{position:absolute;left:16px;top:-80px;z-index:200;background:var(--orange);color:#1a0d05;font-weight:700;padding:10px 18px;transition:top .2s var(--ease)}
.skip-link:focus{top:14px}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px}
/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;font-size:14px;font-weight:500;letter-spacing:.05em;border:1px solid var(--rule-strong);background:transparent;color:var(--paper);transition:background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease)}
.btn:hover{border-color:var(--orange-soft);color:#fff;background:rgba(154,174,201,.1)}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#1a0d05;font-weight:700}
.btn--accent:hover{background:var(--orange-soft);border-color:var(--orange-soft);color:#2a1105}
.btn--ghost{border-color:rgba(255,107,53,.55);color:var(--orange-soft)}
.btn--ghost:hover{background:rgba(255,107,53,.14);border-color:var(--orange);color:#fff}
.btn--quiet{border-color:var(--rule-strong);background:rgba(22,52,92,.72);color:var(--paper)}
.btn--quiet:hover{background:var(--ink-700);border-color:var(--orange-soft)}
/* tags */
.tag{display:inline-flex;align-items:center;padding:3px 9px;border:1px solid var(--rule-strong);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--steel);white-space:nowrap}
.tag--teal{border-color:var(--teal);color:var(--teal)}
.tag--orange{border-color:var(--orange);color:var(--orange)}
.tag--solid{background:var(--teal);border-color:var(--teal);color:#04211d}
/* header */
.site-header{position:relative;background:var(--ink-800);color:var(--paper);border-bottom:1px solid var(--rule);overflow:hidden}
.header-veil{position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(154,174,201,.4) 1px, transparent 1.6px),
    linear-gradient(118deg, transparent 33%, rgba(255,107,53,.18) 34%, rgba(255,107,53,0) 54%);
  background-size:40px 40px,100% 100%;
}
.scroll-progress{position:absolute;left:0;bottom:0;width:100%;height:2px;background:rgba(154,174,201,.16);z-index:6}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--orange),var(--teal))}
.masthead{position:relative;z-index:2;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;padding-block:26px 22px}
.masthead__side{min-width:0}
.masthead__side--right{display:flex;align-items:center;justify-content:flex-end}
.masthead__kicker{font-size:12.5px;letter-spacing:.14em;color:var(--orange)}
.masthead__meta{margin-top:8px;font-size:11.5px;letter-spacing:.08em;color:var(--steel)}
.masthead__core{text-align:center;padding-inline:36px;border-left:1px solid var(--rule);border-right:1px solid var(--rule)}
.masthead__brand{display:inline-block;font-size:clamp(1.9rem,4.4vw,3rem);font-weight:900;letter-spacing:-.03em;line-height:1;color:var(--paper)}
.masthead__brand:hover{color:var(--orange-soft)}
.masthead__tagline{margin-top:10px;font-size:13px;letter-spacing:.08em;color:var(--steel)}
.masthead__actions{display:flex;align-items:center;gap:10px}
/* nav band */
.nav-band{position:relative;z-index:2;border-top:1px solid var(--rule);background:linear-gradient(180deg,rgba(22,52,92,.62),rgba(6,20,40,.28))}
.nav-band__inner{display:flex;justify-content:center;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.nav-band__inner::-webkit-scrollbar{display:none}
.nav-list{display:flex;align-items:stretch;gap:2px;min-width:max-content}
.nav-link{display:flex;align-items:baseline;gap:9px;padding:15px 20px;font-size:15px;letter-spacing:.04em;color:var(--steel);border-bottom:2px solid transparent;white-space:nowrap;transition:color .24s var(--ease),background .24s var(--ease),border-color .24s var(--ease)}
.nav-link__index{font-size:11px;color:var(--teal);letter-spacing:.06em}
.nav-link:hover{color:#fff;background:rgba(154,174,201,.09)}
.nav-link:hover .nav-link__index{color:var(--orange-soft)}
.nav-link[aria-current="page"]{color:var(--paper);font-weight:700;border-bottom-color:var(--orange);background:rgba(255,107,53,.13)}
.nav-link[aria-current="page"] .nav-link__index{color:var(--orange)}
/* nav toggle */
.nav-toggle{display:none;align-items:center;gap:10px;padding:9px 13px;border:1px solid var(--rule-strong);font-size:12.5px;letter-spacing:.14em;color:var(--paper)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars i{display:block;height:2px;width:100%;background:var(--orange);transition:transform .24s var(--ease),opacity .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
/* index drawer */
.index-drawer{position:fixed;inset:0;z-index:120;display:none;background:rgba(6,20,40,.74)}
.index-drawer[data-open]{display:block;animation:drawer-fade .24s var(--ease)}
@keyframes drawer-fade{from{opacity:0}to{opacity:1}}
.index-drawer__panel{position:absolute;top:0;right:0;width:min(460px,100%);height:100%;overflow-y:auto;background:var(--ink-800);border-left:1px solid var(--rule-strong);box-shadow:-30px 0 60px rgba(6,20,40,.6);padding:26px var(--gutter) 56px;animation:panel-in .28s var(--ease)}
@keyframes panel-in{from{transform:translateX(26px);opacity:.4}to{transform:none;opacity:1}}
.index-drawer__head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--rule)}
.index-drawer__title{font-size:1.5rem;font-weight:900;letter-spacing:-.02em}
.index-drawer__close{font-size:11px;letter-spacing:.14em;color:var(--steel);border:1px solid var(--rule-strong);padding:6px 10px;transition:color .24s var(--ease),border-color .24s var(--ease)}
.index-drawer__close:hover{color:var(--orange);border-color:var(--orange)}
.index-drawer__hint{margin-top:14px;font-size:13px;color:var(--steel);line-height:1.7}
.index-search{display:block;margin-top:16px;padding:10px 12px;border:1px solid var(--rule-strong);transition:border-color .24s var(--ease)}
.index-search:focus-within{border-color:var(--orange)}
.index-search__label{display:block;font-size:10.5px;letter-spacing:.2em;color:var(--teal)}
.index-search__input{display:block;width:100%;margin-top:6px;background:transparent;border:0;outline:none;font-size:15px;letter-spacing:.02em}
.index-search__input::placeholder{color:rgba(154,174,201,.66)}
.index-list{margin-top:12px}
.index-item{display:grid;grid-template-columns:32px 1fr auto;gap:6px 12px;align-items:baseline;padding:14px 2px;border-bottom:1px solid var(--rule)}
.index-item[hidden]{display:none}
.index-item__no{font-size:11px;color:var(--orange)}
.index-item__label{font-size:16px;font-weight:700;color:var(--paper)}
.index-item__label:hover{color:var(--orange-soft)}
.index-item__meta{grid-column:2/-1;font-size:12.5px;color:var(--steel);line-height:1.6}
.index-drawer__empty{margin-top:20px;font-size:13.5px;color:var(--teal)}
/* footer */
.site-footer{position:relative;background:var(--ink-900);color:var(--paper);border-top:1px solid var(--rule)}
.footer-top{padding-block:64px 44px;border-bottom:1px solid var(--rule)}
.footer-top__label{font-size:11px;letter-spacing:.24em;color:var(--teal)}
.footer-lead{margin-top:16px;max-width:660px;font-size:clamp(1.35rem,2.6vw,2.1rem);font-weight:900;letter-spacing:-.02em;line-height:1.3}
.footer-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:36px;padding-block:48px;border-bottom:1px solid var(--rule)}
.footer-brand__name{display:inline-block;font-size:1.5rem;font-weight:900;letter-spacing:-.02em}
.footer-brand__name:hover{color:var(--orange-soft)}
.footer-brand__line{margin-top:12px;max-width:270px;font-size:13px;line-height:1.8;color:var(--steel)}
.footer-brand__line--mono{margin-top:8px;font-size:12px;letter-spacing:.08em;color:var(--orange-soft)}
.footer-col__title{padding-bottom:10px;border-bottom:1px solid var(--rule);font-size:12px;letter-spacing:.16em;font-weight:700}
.footer-list{margin-top:16px;display:grid;gap:11px}
.footer-link{font-size:14px;color:var(--steel);transition:color .2s var(--ease)}
.footer-link:hover{color:var(--orange-soft)}
.footer-link[aria-current="page"]{color:var(--orange)}
.footer-base{display:grid;grid-template-columns:1.15fr 1fr;gap:36px;padding-block:40px 64px}
.contact-line{display:flex;align-items:center;gap:14px;padding:12px 0;border-bottom:1px solid var(--rule)}
.contact-line__key{flex:0 0 46px;font-size:10.5px;letter-spacing:.18em;color:var(--teal)}
.contact-line__val{font-family:var(--font-mono);font-size:14.5px;letter-spacing:.01em;color:var(--paper);word-break:break-all}
.contact-line__val--text{font-family:var(--font-sans);font-size:13.5px;line-height:1.7;color:var(--steel)}
.copy-btn{margin-left:auto;flex:0 0 auto;padding:4px 10px;border:1px solid var(--rule-strong);font-size:11.5px;letter-spacing:.1em;color:var(--steel);transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease)}
.copy-btn:hover{color:var(--paper);border-color:var(--orange-soft)}
.copy-btn[data-copied]{color:var(--teal);border-color:var(--teal);background:rgba(0,194,168,.12)}
.footer-address{margin-top:16px;font-size:13.5px;line-height:1.8;color:var(--steel);max-width:420px}
.footer-note{font-size:12.5px;line-height:1.9;color:var(--steel)}
.legal-list{display:flex;flex-wrap:wrap;gap:20px;margin-top:16px}
.footer-record{margin-top:18px;font-size:12px;letter-spacing:.08em;color:var(--steel)}
.footer-copy{margin-top:6px;font-size:12px;color:rgba(154,174,201,.7)}
.to-top{position:fixed;right:22px;bottom:22px;z-index:60;opacity:0;transform:translateY(14px);pointer-events:none;transition:opacity .24s var(--ease),transform .24s var(--ease),background .24s var(--ease),border-color .24s var(--ease)}
.to-top[data-visible]{opacity:1;transform:none;pointer-events:auto;animation:top-pulse .9s var(--ease) 1}
@keyframes top-pulse{0%{box-shadow:0 0 0 0 rgba(255,107,53,.55)}100%{box-shadow:0 0 0 14px rgba(255,107,53,0)}}
/* page shell + rail */
.site-shell{display:grid;grid-template-columns:var(--rail) minmax(0,1fr);align-items:start}
.rail{grid-column:1;position:sticky;top:0;align-self:start;max-height:100vh;overflow-y:auto;padding:36px 22px 40px 24px;border-right:1px solid var(--rule);background:var(--ink-900)}
.rail__title{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--teal)}
.rail-nav{margin-top:18px;display:grid;gap:2px}
.rail-link{display:grid;grid-template-columns:26px 1fr;gap:10px;align-items:baseline;padding:10px 8px;font-size:14px;color:var(--steel);border-left:2px solid transparent;transition:color .24s var(--ease),background .24s var(--ease),border-color .24s var(--ease)}
.rail-link__no{font-family:var(--font-mono);font-size:11px;color:var(--orange)}
.rail-link:hover{color:#fff;background:rgba(154,174,201,.08)}
.rail-link[aria-current="true"]{color:var(--paper);font-weight:700;border-left-color:var(--orange);background:rgba(255,107,53,.12)}
.site-main{grid-column:2;min-width:0}
/* sections */
.section{padding-block:clamp(48px,7vw,96px)}
.section--ink{background:var(--ink-800);color:var(--paper)}
.section--paper{background:var(--paper);color:var(--graphite);border-top:1px solid var(--rule-strong);border-bottom:1px solid var(--rule-strong)}
.section__head{display:grid;gap:12px;max-width:760px}
.section__no{font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--orange)}
.section__title{font-size:clamp(1.6rem,3vw,2.6rem)}
.section__lede{max-width:640px;font-size:16.5px;line-height:1.75;color:var(--steel)}
.section--paper .section__lede{color:var(--graphite);opacity:.78}
.prose{max-width:640px;font-size:17px;line-height:1.75}
.prose p+p{margin-top:1em}
.prose h3{margin-top:1.7em;margin-bottom:.5em;font-size:1.2rem}
.section--paper .prose{color:var(--graphite)}
/* paper block */
.paper-block{position:relative;background:var(--paper);color:var(--graphite);border:1px solid rgba(11,31,58,.42);padding:24px;box-shadow:10px 10px 0 -1px var(--ink-900),10px 10px 0 0 var(--rule-strong)}
.paper-block__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--teal-deep)}
.paper-block__title{margin-top:8px;font-size:1.25rem;font-weight:900;letter-spacing:-.01em}
.paper-block__body{margin-top:10px;font-size:15.5px;line-height:1.7}
.section--paper .paper-block{box-shadow:10px 10px 0 -1px rgba(11,31,58,.1),10px 10px 0 0 rgba(11,31,58,.24)}
.paper-block--accent{border-top:3px solid var(--orange)}
/* grid */
.grid{display:grid;gap:var(--gap)}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
/* figures */
.figure{margin:0}
.figure__frame{position:relative;overflow:hidden;border:1px solid var(--rule-strong);background:linear-gradient(115deg,var(--ink-900),var(--ink-700))}
.figure__frame::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 1px 1px,rgba(154,174,201,.42) 1px,transparent 1.6px);background-size:28px 28px;opacity:.55}
.figure__frame--wide{aspect-ratio:16/9}
.figure__frame--tall{aspect-ratio:4/5}
.figure__frame--square{aspect-ratio:1/1}
.figure__img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.figure__caption{margin-top:10px;font-size:12.5px;letter-spacing:.04em;line-height:1.7;color:var(--steel)}
.media-frame{position:relative;min-height:180px;overflow:hidden;border:1px solid var(--rule-strong);background:linear-gradient(115deg,var(--ink-900),var(--ink-700))}
.media-frame::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 1px 1px,rgba(154,174,201,.4) 1px,transparent 1.6px),linear-gradient(115deg,transparent 30%,rgba(255,107,53,.22) 31%,transparent 56%);background-size:32px 32px,100% 100%}
.media-frame::after{content:"";position:absolute;right:-46px;bottom:-46px;width:180px;height:180px;border:1px solid var(--teal);opacity:.35;transform:rotate(45deg)}
/* stats */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1px;background:var(--rule)}
.stat{padding:22px 20px;background:var(--ink-800)}
.section--paper .stat{background:var(--paper)}
.stat__num{font-family:var(--font-mono);font-size:clamp(1.5rem,3vw,2.2rem);letter-spacing:-.02em;color:var(--orange)}
.stat__label{margin-top:8px;font-size:12.5px;letter-spacing:.08em;color:var(--steel)}
.section--paper .stat__label{color:var(--graphite);opacity:.72}
/* breadcrumbs */
.breadcrumbs{padding-block:18px}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:6px 0;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--steel)}
.breadcrumbs__item{display:flex;align-items:center}
.breadcrumbs__item+.breadcrumbs__item::before{content:"/";margin:0 12px;color:var(--orange)}
.breadcrumbs a:hover{color:var(--orange-soft)}
/* note strip */
.note-strip{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;padding:14px 18px;border-left:2px solid var(--teal);background:rgba(0,194,168,.1);font-size:14.5px;line-height:1.7}
.note-strip__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--teal)}
/* chips */
.chip-set{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:7px 14px;border:1px solid var(--rule-strong);font-size:13px;letter-spacing:.04em;color:var(--steel);transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease)}
.chip:hover{color:var(--paper);border-color:var(--orange-soft)}
.chip[aria-pressed="true"]{color:var(--orange);border-color:var(--orange);background:rgba(255,107,53,.16)}
/* reveal */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal][data-visible]{opacity:1;transform:none}
/* responsive */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-base{grid-template-columns:1fr}
}
@media (max-width:1024px){
  .site-shell{grid-template-columns:1fr}
  .rail{position:static;max-height:none;border-right:0;border-bottom:1px solid var(--rule);padding:22px var(--gutter)}
  .rail-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-main{grid-column:1}
}
@media (max-width:960px){
  .grid--three{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  .masthead{grid-template-columns:1fr auto;grid-template-areas:"core toggle" "actions actions";align-items:start;gap:16px 12px;padding-block:18px 16px}
  .masthead__side--left{display:none}
  .masthead__side--right{display:contents}
  .masthead__core{grid-area:core;text-align:left;padding-inline:0;border-left:0;border-right:0}
  .masthead__brand{font-size:clamp(1.6rem,7vw,2.2rem)}
  .masthead__tagline{text-align:left;font-size:12.5px}
  .masthead__actions{grid-area:actions;justify-content:flex-start;flex-wrap:wrap;gap:8px}
  .masthead__actions .btn{padding:9px 14px;font-size:13px}
  .nav-toggle{grid-area:toggle;display:inline-flex}
  .nav-band{background:var(--ink-900)}
  .nav-band{display:none}
  .nav-band[data-open]{display:block}
  .nav-band__inner{justify-content:flex-start;overflow:visible;padding-block:8px 14px}
  .nav-list{flex-direction:column;width:100%;min-width:0;gap:0}
  .nav-link{padding:14px 4px;border-bottom:1px solid var(--rule);border-left:2px solid transparent}
  .nav-link[aria-current="page"]{border-bottom-color:var(--rule);border-left-color:var(--orange)}
  .footer-top{padding-block:48px 34px}
  .footer-grid{padding-block:36px}
  .footer-base{padding-block:32px 48px}
  .to-top{right:16px;bottom:16px;padding:10px 14px;font-size:12.5px}
}
@media (max-width:680px){
  :root{--gutter:20px;--gap:16px}
  body{font-size:16px}
  .grid--two,.grid--three{grid-template-columns:1fr}
  .grid--two,.grid--three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .contact-line{flex-wrap:wrap;gap:8px 14px}
  .copy-btn{margin-left:0}
  .index-drawer__panel{width:100%;padding:22px var(--gutter) 48px}
  .paper-block{box-shadow:6px 6px 0 -1px var(--ink-900),6px 6px 0 0 var(--rule-strong)}
  .section--paper .paper-block{box-shadow:6px 6px 0 -1px rgba(11,31,58,.1),6px 6px 0 0 rgba(11,31,58,.24)}
  .stat-row{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-reveal]{opacity:1;transform:none}
  .to-top[data-visible]{animation:none}
}