/* ========== 1. Reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,picture,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
hr{border:0}

/* ========== 2. Tokens ========== */
:root{
  --ink-900:#070E22;
  --ink-700:#10203F;
  --ink-600:#182B52;
  --orange-500:#FF5B1F;
  --orange-300:#FFB08A;
  --lime-400:#B8FF3C;
  --cyan-400:#21D4E8;
  --glass-100:#E8F0FF;
  --floor-050:#F5F7FB;
  --grid-500:#6C7A99;
  --grid-text:#8B99B8;
  --line-dark:rgba(232,240,255,.14);
  --line-soft:rgba(232,240,255,.07);
  --line-light:rgba(7,14,34,.12);
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"PingFang SC","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --shell:1220px;
  --gap:clamp(16px,2.4vw,28px);
  --radius:14px;
  --radius-sm:8px;
  --shadow-deep:0 26px 70px rgba(3,8,20,.6);
  --shadow-soft:0 18px 40px rgba(7,14,34,.10);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ========== 3. Base ========== */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.7;
  color:var(--glass-100);
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(108,122,153,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(108,122,153,.10) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  -webkit-font-smoothing:antialiased;
  transition:padding-bottom .3s var(--ease);
}
body[data-strip="on"]{padding-bottom:64px}
::selection{background:var(--lime-400);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--lime-400);outline-offset:3px;border-radius:4px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.index-tag{
  display:inline-block;
  padding:3px 8px;
  border:1px solid var(--line-dark);
  border-radius:2px;
  font-size:10px;
  letter-spacing:.18em;
  color:var(--grid-text);
  line-height:1.5;
}
.skip-link{
  position:absolute;
  left:50%;
  top:-120px;
  transform:translateX(-50%);
  z-index:200;
  background:var(--lime-400);
  color:var(--ink-900);
  font-weight:700;
  font-size:14px;
  padding:10px 20px;
  border-radius:0 0 10px 10px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

/* ========== 4. Layout ========== */
.container{width:min(100% - 2 * var(--gap),var(--shell));margin-inline:auto}
.section{padding:clamp(48px,8vw,112px) 0}
.section--floor{background:var(--floor-050);color:var(--ink-900)}
.section--floor .section__lede{color:#3B4A69}
.section--floor .prose p{color:#33405C}
.section--floor .aside-note{color:#4B5A78;border-top-color:var(--orange-500)}
.section__head{display:grid;gap:12px;max-width:66ch;margin-bottom:clamp(24px,4vw,48px)}
.section__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--orange-500)}
.section__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(30px,5.2vw,64px);
  line-height:.98;
  letter-spacing:-.01em;
}
.section__lede{font-size:17px;color:rgba(232,240,255,.78)}
.section-number{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--orange-500);
}
.prose{display:grid;gap:18px;max-width:62ch;font-size:17px;line-height:1.75}
.prose h3{font-size:clamp(19px,2vw,24px);font-weight:800;letter-spacing:.01em;line-height:1.35}
.prose p{color:rgba(232,240,255,.82)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ========== 5. Components ========== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.85em 1.6em;
  border-radius:999px;
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  letter-spacing:.03em;
  line-height:1.2;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--orange-500);color:var(--ink-900)}
.btn--primary:hover{background:var(--orange-300)}
.btn--ghost{border-color:var(--line-dark);color:var(--glass-100);background:rgba(232,240,255,.05)}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.btn--sm{padding:.6em 1.15em;font-size:13px}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid var(--line-dark);
  border-radius:999px;
  font-size:11px;
  letter-spacing:.14em;
  color:var(--grid-text);
  line-height:1.6;
}
.tag--lime{border-color:var(--lime-400);color:var(--lime-400)}
.tag--orange{border-color:var(--orange-500);color:var(--orange-300)}
.tag--cyan{border-color:var(--cyan-400);color:var(--cyan-400)}
.card{
  padding:clamp(18px,2.4vw,26px);
  border-radius:var(--radius);
  border:1px solid var(--line-dark);
  background:var(--ink-700);
}
.card--glass{
  background:rgba(232,240,255,.06);
  border-color:rgba(232,240,255,.16);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.card--floor{background:#fff;color:var(--ink-900);border-color:var(--line-light);box-shadow:var(--shadow-soft)}
.card--floor p{color:#33405C}
.card--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%)}
.data-card{
  display:grid;
  gap:6px;
  padding:18px;
  border:1px solid var(--line-dark);
  border-left:3px solid var(--orange-500);
  border-radius:6px;
  background:rgba(232,240,255,.05);
}
.data-card__label{font-size:11px;letter-spacing:.18em;color:var(--grid-text)}
.data-card__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.4vw,40px);
  font-weight:700;
  line-height:1;
  color:var(--lime-400);
}
.data-card__unit{font-size:13px;letter-spacing:.08em;color:var(--grid-text)}
.stat-row{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:18px 0;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--grid-text);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";font-family:var(--font-mono);color:var(--orange-500)}
.breadcrumb a:hover{color:var(--cyan-400)}
.jump-list{display:grid;gap:2px}
.jump-list__link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:12px 2px;
  border-bottom:1px dashed rgba(108,122,153,.45);
  font-size:15px;
  color:rgba(232,240,255,.88);
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.jump-list__link:hover{color:var(--lime-400);padding-left:8px}
.jump-list__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--grid-text)}
.aside-note{
  border-top:2px solid var(--cyan-400);
  padding-top:12px;
  font-size:13px;
  line-height:1.7;
  color:var(--grid-text);
}
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  background:
    linear-gradient(135deg,rgba(33,212,232,.22),rgba(255,91,31,.18) 58%,rgba(184,255,60,.16)),
    var(--ink-700);
}
.media-frame > img,
.media-frame > picture > img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),calc(100% - 30px) 100%,0 100%)}
.media-frame__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:10px 14px;
  font-size:11px;
  letter-spacing:.14em;
  color:var(--glass-100);
  background:linear-gradient(0deg,rgba(7,14,34,.88),rgba(7,14,34,0));
}
.disclosure{
  border:1px solid var(--line-dark);
  border-radius:var(--radius-sm);
  background:rgba(232,240,255,.04);
  overflow:hidden;
}
.disclosure + .disclosure{margin-top:10px}
.disclosure__trigger{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 18px;
  text-align:left;
  font-size:16px;
  font-weight:600;
  color:var(--glass-100);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.disclosure__trigger:hover{background:rgba(232,240,255,.05)}
.disclosure__trigger[aria-expanded="true"]{color:var(--lime-400)}
.disclosure__icon{
  position:relative;
  flex:none;
  width:22px;
  height:22px;
  border:1px solid var(--line-dark);
  border-radius:50%;
}
.disclosure__icon::before,
.disclosure__icon::after{
  content:"";
  position:absolute;
  left:50%;top:50%;
  transform:translate(-50%,-50%);
  background:currentColor;
}
.disclosure__icon::before{width:10px;height:1.5px}
.disclosure__icon::after{width:1.5px;height:10px;transition:transform .24s var(--ease)}
.disclosure__trigger[aria-expanded="true"] .disclosure__icon::after{transform:translate(-50%,-50%) scaleY(0)}
.disclosure__panel{
  max-height:0;
  overflow:hidden;
  visibility:hidden;
  transition:max-height .26s var(--ease),visibility .26s;
}
.disclosure__panel[data-open]{visibility:visible}
.disclosure__body{
  display:grid;
  gap:12px;
  padding:0 18px 18px;
  font-size:15px;
  line-height:1.75;
  color:rgba(232,240,255,.8);
}

/* ========== 6. Header ========== */
.site-header{position:sticky;top:0;z-index:90;background:transparent}
.header-glass{
  position:relative;
  background:linear-gradient(180deg,rgba(7,14,34,.97),rgba(7,14,34,.84));
  border-bottom:1px solid var(--line-dark);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  transition:background .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header[data-collapsed] .header-glass{box-shadow:0 18px 44px rgba(3,8,20,.5)}
.header-shell{width:min(100% - 2 * var(--gap),var(--shell));margin-inline:auto}
.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:var(--gap);
  padding:18px 0 14px;
  transition:padding .3s var(--ease);
}
.masthead__meta{display:flex;align-items:center;gap:10px;font-size:11px;letter-spacing:.16em;color:var(--grid-text)}
.masthead__round{font-size:13px;color:var(--lime-400)}
.brand{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center}
.brand__word{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(22px,2.4vw,32px);
  line-height:1;
  letter-spacing:.02em;
  color:var(--glass-100);
  padding-bottom:7px;
  background-image:linear-gradient(90deg,var(--orange-500),var(--orange-500));
  background-repeat:no-repeat;
  background-size:44% 3px;
  background-position:center bottom;
  transform:skewX(0deg);
}
.brand__latin{font-size:10px;letter-spacing:.24em;color:var(--grid-text);transition:opacity .25s var(--ease)}
.masthead__tools{display:flex;justify-content:flex-end;align-items:center;gap:10px}
.tool-btn{
  padding:7px 14px;
  border:1px solid var(--line-dark);
  border-radius:999px;
  background:rgba(232,240,255,.04);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--glass-100);
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.tool-btn:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.tool-btn[aria-pressed="true"]{background:var(--lime-400);border-color:var(--lime-400);color:var(--ink-900)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 13px;
  border:1px solid var(--line-dark);
  border-radius:999px;
  font-size:12px;
  letter-spacing:.16em;
  color:var(--glass-100);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-400)}
.nav-toggle[aria-expanded="true"]{border-color:var(--orange-500);color:var(--orange-300)}
.nav-toggle__bars{position:relative;display:inline-block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:1.5px;
  background:currentColor;
  transition:transform .25s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4.2px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4.2px) rotate(-45deg)}
.nav-toggle__text{line-height:1}
.site-nav{border-top:1px solid var(--line-soft)}
.site-nav__list{
  counter-reset:navIndex;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:clamp(10px,2vw,34px);
}
.site-nav__item{counter-increment:navIndex}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.55em;
  padding:12px 2px;
  border-bottom:2px solid transparent;
  font-size:12px;
  letter-spacing:.16em;
  color:rgba(232,240,255,.7);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__link::before{
  content:counter(navIndex,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:0;
  color:var(--grid-500);
  transition:color .2s var(--ease);
}
.site-nav__link:hover{color:var(--glass-100);border-bottom-color:var(--cyan-400)}
.site-nav__link[aria-current="page"]{color:var(--glass-100);border-bottom-color:var(--orange-500)}
.site-nav__link[aria-current="page"]::before{color:var(--lime-400)}
.scroll-meter{
  position:absolute;
  left:0;bottom:-1px;
  height:2px;
  width:var(--progress,0%);
  background:linear-gradient(90deg,var(--orange-500),var(--cyan-400),var(--lime-400));
}
.race-strip{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:85;
  transform:translateY(110%);
  transition:transform .38s var(--ease);
  background:linear-gradient(90deg,rgba(16,32,63,.96),rgba(7,14,34,.96));
  border-top:1px solid var(--line-dark);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}
.race-strip::before{
  content:"";
  position:absolute;
  top:0;bottom:0;left:0;
  width:3px;
  background:linear-gradient(180deg,var(--orange-500),var(--lime-400));
}
.race-strip[data-visible]{transform:translateY(0)}
.race-strip__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,3vw,34px);
  width:min(100% - 2 * var(--gap),var(--shell));
  margin-inline:auto;
  padding:12px 0;
  overflow-x:auto;
}
.race-strip__label{font-size:10px;letter-spacing:.2em;color:var(--grid-text);white-space:nowrap}
.race-strip__link{
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--glass-100);
  white-space:nowrap;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.race-strip__link:hover{color:var(--lime-400);border-bottom-color:var(--lime-400)}

/* ========== 7. Footer ========== */
.site-footer{
  margin-top:clamp(64px,10vw,140px);
  background:linear-gradient(180deg,var(--ink-900),var(--ink-700) 72%);
  border-top:1px solid var(--line-dark);
  color:var(--glass-100);
}
.footer-shell{
  width:min(100% - 2 * var(--gap),var(--shell));
  margin-inline:auto;
  padding:clamp(40px,6vw,76px) 0 28px;
}
.footer-mast{display:grid;gap:18px;padding-bottom:34px;border-bottom:1px dashed rgba(108,122,153,.45)}
.footer-mast__brand{display:block}
.footer-mast__word{
  display:block;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(28px,4vw,46px);
  line-height:1;
  letter-spacing:.01em;
}
.footer-mast__latin{display:block;margin-top:10px;font-size:10px;letter-spacing:.24em;color:var(--grid-text)}
.footer-mast__line{max-width:56ch;font-size:15px;color:rgba(232,240,255,.76)}
.footer-coords{display:flex;flex-wrap:wrap;gap:10px}
.footer-coords span{
  padding:4px 10px;
  border:1px dashed rgba(108,122,153,.55);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--grid-text);
}
.footer-body{
  display:grid;
  gap:clamp(28px,4vw,56px);
  grid-template-columns:minmax(0,1fr);
  padding:34px 0;
}
.footer-nav__title,
.footer-legal__title{
  margin-bottom:16px;
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--grid-text);
}
.footer-nav__list{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}
.footer-nav__list a{
  display:inline-block;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  font-size:15px;
  color:rgba(232,240,255,.86);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-nav__list a:hover{color:var(--cyan-400);border-bottom-color:var(--cyan-400)}
.footer-legal{display:grid;gap:16px;align-content:start}
.footer-legal__list{display:grid;gap:14px}
.footer-legal__item{display:grid;gap:3px}
.footer-legal__label{font-size:10px;letter-spacing:.18em;color:var(--grid-text)}
.footer-legal__value{font-size:15px;color:var(--glass-100);word-break:break-all}
.footer-legal__note{font-size:13px;line-height:1.7;color:var(--grid-text)}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:12px 22px}
.footer-legal__link{
  padding-bottom:2px;
  border-bottom:1px solid rgba(232,240,255,.3);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--glass-100);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-legal__link:hover{color:var(--lime-400);border-bottom-color:var(--lime-400)}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-top:22px;
  border-top:1px solid var(--line-dark);
}
.footer-base__copy{font-size:12px;letter-spacing:.06em;color:var(--grid-text)}

/* ========== 8. Responsive ========== */
@media (min-width:760px){
  .footer-body{grid-template-columns:minmax(190px,1fr) minmax(0,1.7fr)}
}
@media (max-width:899px){
  .nav-toggle{display:inline-flex}
  .masthead{padding:14px 0 10px}
  .site-nav{
    max-height:0;
    overflow:hidden;
    border-top:1px solid transparent;
    transition:max-height .28s var(--ease),border-color .28s var(--ease);
  }
  .site-nav[data-open]{max-height:78vh;overflow-y:auto;border-top-color:var(--line-dark)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:8px 0 16px}
  .site-nav__item + .site-nav__item{border-top:1px solid var(--line-soft)}
  .site-nav__link{
    padding:14px 16px;
    border-bottom:0;
    border-left:2px solid transparent;
    font-size:14px;
    letter-spacing:.12em;
  }
  .site-nav__link:hover{border-left-color:var(--cyan-400);background:rgba(232,240,255,.04)}
  .site-nav__link[aria-current="page"]{
    border-left-color:var(--orange-500);
    border-bottom-color:transparent;
    background:rgba(255,91,31,.1);
  }
  .site-header[data-open] .header-glass{background:var(--ink-900)}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
}
@media (max-width:639px){
  .masthead__meta{display:none}
  .masthead{grid-template-columns:auto 1fr auto}
  .brand{align-items:flex-start;text-align:left}
  .brand__word{background-position:left bottom;font-size:20px}
  .footer-nav__list{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ========== 9. 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;
  }
  .race-strip{transition:none}
  .site-header[data-collapsed] .brand__latin{opacity:1}
}