/* ============ 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,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
:target{scroll-margin-top:calc(var(--bar-h) + 28px)}

/* ============ 2. Variables ============ */
:root{
  --ink:#050B1F;
  --panel:#0B1533;
  --edge:#1E2A5C;
  --cyan:#00F0E0;
  --violet:#7A5CFF;
  --orange:#FF7A2F;
  --ice:#E6F7FF;
  --mist:#93A5C4;
  --up:#19C37D;
  --grad-flux:linear-gradient(120deg,#00F0E0 0%,#7A5CFF 55%,#050B1F 100%);
  --grad-panel:linear-gradient(165deg,rgba(11,21,51,.96),rgba(6,12,30,.97));
  --rail-w:244px;
  --bar-h:46px;
  --wrap:1320px;
  --gap:clamp(12px,1.4vw,22px);
  --hard:6px 6px 0 rgba(0,0,0,.55);
  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-head);
  --font-mono:ui-monospace,"JetBrains Mono","Roboto Mono","SFMono-Regular",Menlo,Consolas,monospace;
}

/* ============ 3. Base ============ */
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 78% at 100% 0%,rgba(122,92,255,.18),transparent 62%),
    radial-gradient(90% 62% at 0% 100%,rgba(0,240,224,.11),transparent 64%),
    linear-gradient(180deg,#050B1F 0%,#060D24 46%,#050B1F 100%);
  background-attachment:fixed;
  color:var(--ice);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  letter-spacing:.005em;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.5;
  background-image:
    linear-gradient(rgba(30,42,92,.28) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,42,92,.28) 1px,transparent 1px);
  background-size:72px 72px,72px 72px;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;line-height:1.1}
h1{font-size:clamp(32px,5.4vw,76px);line-height:1.02}
h2{font-size:clamp(24px,3.2vw,40px)}
h3{font-size:clamp(18px,2vw,24px)}
p{max-width:42ch}
strong{font-weight:700}
:focus-visible{outline:3px solid var(--cyan);outline-offset:2px}

main{display:block;position:relative;z-index:1;padding-top:calc(var(--bar-h) + 30px)}
#main-content{display:block}

/* ============ 4. Layout utilities ============ */
.wrap{width:min(var(--wrap),calc(100% - var(--gap)*2));margin-inline:auto}
.section{padding-block:clamp(28px,4vw,58px);border-top:2px solid var(--edge);position:relative}
.section--flush{border-top:0}
.grid{display:grid;gap:var(--gap)}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--4-5-3{grid-template-columns:4fr 5fr 3fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--halves{grid-template-columns:repeat(2,1fr)}
.grid--thirds{grid-template-columns:repeat(3,1fr)}
.rule{height:2px;background:var(--edge);border:0}
.rule--flux{height:3px;background:var(--grad-flux);border:0}

/* ============ 5. Text atoms ============ */
.label{font-size:12px;font-weight:600;letter-spacing:.14em;color:var(--mist)}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  color:var(--cyan);border:1px solid var(--edge);background:rgba(0,240,224,.08);
  padding:5px 10px;
}
.lede{font-size:clamp(16px,1.5vw,19px);line-height:1.75;color:var(--ice);max-width:42ch}
.card-title{font-size:clamp(17px,1.8vw,22px);font-weight:900;letter-spacing:-.01em}
.card-note{font-size:14px;color:var(--mist);line-height:1.7}
.data-num{font-family:var(--font-mono);font-weight:700;font-size:clamp(28px,4vw,52px);line-height:1;letter-spacing:-.02em;color:var(--cyan)}
.data-num--violet{color:var(--violet)}
.data-num--orange{color:var(--orange)}
.data-num--ice{color:var(--ice)}
.unit{font-family:var(--font-mono);font-size:.42em;color:var(--mist);margin-left:6px;letter-spacing:0}
.tag{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;padding:3px 7px;border:1px solid var(--edge);background:rgba(30,42,92,.42);color:var(--mist)}
.tag--up{color:var(--up);border-color:rgba(25,195,125,.55)}
.tag--heat{color:var(--orange);border-color:rgba(255,122,47,.55)}

/* ============ 6. Surfaces ============ */
.panel,.card{
  position:relative;background:var(--grad-panel);
  border:2px solid var(--edge);box-shadow:var(--hard);
  padding:clamp(16px,2vw,26px);
}
.card--link{display:block;transition:border-color .18s,transform .18s,box-shadow .18s}
.card--link:hover,.card--link:focus-visible{
  border-color:var(--cyan);transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 rgba(0,240,224,.2);
}
.panel--cut{clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,0 100%)}

/* ============ 7. Buttons ============ */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border:2px solid var(--cyan);background:var(--cyan);color:#04101F;
  font-weight:700;font-size:14px;letter-spacing:.02em;
  transition:background .18s,color .18s,transform .18s,box-shadow .18s,border-color .18s;
}
.btn:hover,.btn:focus-visible{transform:translate(-2px,-2px);box-shadow:var(--hard)}
.btn--ghost{background:transparent;color:var(--ice);border-color:var(--edge)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.btn--heat{background:var(--orange);border-color:var(--orange);color:#160800}
.btn--sm{padding:8px 14px;font-size:13px}

/* ============ 8. Skip link ============ */
.skip-link{
  position:fixed;left:14px;top:-120px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:#04101F;
  font-weight:700;font-size:14px;border:2px solid var(--ink);
  transition:top .16s ease-out;
}
.skip-link:focus{top:14px}

/* ============ 9. Header: rail + topbar ============ */
.site-header{position:relative;z-index:60}
.site-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:60;
  display:flex;flex-direction:column;gap:20px;
  padding:22px 20px 18px;overflow-y:auto;
  background:linear-gradient(180deg,rgba(11,21,51,.99),rgba(5,11,31,.99));
  border-right:2px solid var(--edge);
  scrollbar-width:thin;
}
.site-rail::after{
  content:"";position:absolute;top:0;right:-2px;width:2px;height:130px;
  background:var(--grad-flux);
}
.rail-head{display:flex;flex-direction:column;gap:14px}
.rail-brand{
  display:flex;align-items:center;gap:12px;
  padding-bottom:16px;border-bottom:1px solid var(--edge);
}
.brand-mark{
  flex:0 0 44px;width:44px;height:44px;display:grid;place-items:center;
  background:var(--grad-flux);border:2px solid var(--cyan);
  color:#04101F;font-family:var(--font-mono);font-weight:700;font-size:22px;
  box-shadow:var(--hard);
}
.brand-text{display:block;min-width:0}
.brand-name{display:block;font-size:19px;font-weight:900;letter-spacing:-.01em;line-height:1.2}
.brand-sub{display:block;margin-top:4px;font-size:11px;letter-spacing:.14em;color:var(--mist)}
.rail-season{
  display:flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:var(--cyan);
  padding:8px 10px;border:1px solid var(--edge);background:rgba(0,240,224,.07);
}
.season-dot{width:8px;height:8px;flex:0 0 8px;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:seasonPulse 2.4s ease-in-out infinite}
@keyframes seasonPulse{0%,100%{opacity:1}50%{opacity:.32}}

.rail-nav{display:flex;flex-direction:column;gap:10px}
.rail-nav-label{margin-bottom:2px;font-size:11px;font-weight:600;letter-spacing:.18em;color:var(--mist)}
.nav-list{display:flex;flex-direction:column;gap:3px;counter-reset:railnav}
.nav-link{
  position:relative;display:block;
  padding:11px 38px 11px 18px;
  font-size:15px;font-weight:600;color:var(--ice);
  border:1px solid transparent;
  transition:background .18s,border-color .18s,color .18s,transform .18s;
}
.nav-link::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:22px;
  transform:translateY(-50%) scaleY(0);transform-origin:center;
  background:var(--cyan);transition:transform .18s;
}
.nav-link::after{
  counter-increment:railnav;content:counter(railnav,decimal-leading-zero);
  position:absolute;right:12px;top:50%;transform:translateY(-50%);
  font-family:var(--font-mono);font-size:11px;color:var(--mist);opacity:.65;
}
.nav-link:hover{background:rgba(30,42,92,.55);border-color:var(--edge);transform:translateX(2px)}
.nav-link:hover::before{transform:translateY(-50%) scaleY(1)}
.nav-link[aria-current="page"]{
  color:#FFFFFF;border-color:var(--edge);
  background:linear-gradient(90deg,rgba(0,240,224,.18),rgba(122,92,255,.12) 58%,transparent);
}
.nav-link[aria-current="page"]::before{transform:translateY(-50%) scaleY(1);box-shadow:0 0 12px var(--cyan)}
.nav-link[aria-current="page"]::after{color:var(--cyan);opacity:1}

.rail-foot{margin-top:auto;padding-top:16px;border-top:1px solid var(--edge)}
.rail-foot-label{font-size:11px;font-weight:600;letter-spacing:.18em;color:var(--mist)}
.rail-foot-value{margin-top:6px;font-family:var(--font-mono);font-size:18px;font-weight:700;color:var(--orange)}

.rail-scrim{
  position:fixed;inset:0;z-index:55;
  background:rgba(3,7,18,.74);
  opacity:0;pointer-events:none;transition:opacity .22s;
}
.rail-scrim[data-open="true"]{opacity:1;pointer-events:auto}

.site-topbar{
  position:fixed;top:0;left:0;right:0;height:var(--bar-h);z-index:58;
  display:flex;align-items:center;gap:14px;padding:0 16px;
  background:rgba(5,11,31,.94);
  border-bottom:2px solid var(--edge);
  backdrop-filter:blur(8px);
}
.topbar-stream{
  display:flex;align-items:center;gap:26px;flex:1;
  overflow-x:auto;white-space:nowrap;scrollbar-width:none;
}
.topbar-stream::-webkit-scrollbar{display:none}
.topbar-item{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--mist)}
.topbar-tag{
  flex:0 0 auto;padding:2px 7px;font-size:11px;font-weight:600;letter-spacing:.1em;
  background:var(--cyan);color:#04101F;
}
.topbar-tag--violet{background:var(--violet);color:#F3F0FF}
.topbar-tag--orange{background:var(--orange);color:#1A0800}
.topbar-progress{
  position:absolute;left:0;bottom:-2px;height:2px;
  width:var(--p,0%);max-width:100%;background:var(--grad-flux);
}
.nav-toggle{
  display:none;align-items:center;gap:9px;flex:0 0 auto;
  padding:7px 11px;border:2px solid var(--edge);background:var(--panel);
  font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--ice);
  transition:border-color .18s,color .18s;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{
  width:16px;height:12px;
  background-image:
    linear-gradient(var(--cyan),var(--cyan)),
    linear-gradient(var(--cyan),var(--cyan)),
    linear-gradient(var(--cyan),var(--cyan));
  background-size:100% 2px,100% 2px,100% 2px;
  background-position:0 0,0 5px,0 10px;
  background-repeat:no-repeat;
}
.nav-toggle-text{line-height:1}

/* ============ 10. Footer ============ */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(48px,7vw,96px);
  border-top:2px solid var(--edge);
  background:linear-gradient(180deg,rgba(7,14,36,.98),rgba(5,11,31,.99) 62%);
}
.site-footer::before{
  content:"";position:absolute;top:-2px;left:0;width:190px;height:2px;
  background:var(--grad-flux);
}
.foot-strip{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--edge)}
.strip-cell{
  display:flex;flex-direction:column;gap:6px;
  padding:22px 20px;border-left:1px solid var(--edge);border-bottom:1px solid var(--edge);
  transition:background .18s;
}
.strip-cell:nth-child(4n+1){border-left:0}
.strip-cell:hover,.strip-cell:focus-visible{background:rgba(0,240,224,.07)}
.strip-label{font-size:11px;font-weight:600;letter-spacing:.16em;color:var(--mist)}
.strip-value{font-family:var(--font-mono);font-size:19px;font-weight:700;color:var(--cyan);line-height:1.2}
.strip-note{font-size:12px;color:var(--mist);line-height:1.6}

.foot-grid{
  display:grid;grid-template-columns:1.3fr .8fr .9fr 1.6fr;
  gap:clamp(18px,2.4vw,40px);
  padding:clamp(28px,3.6vw,52px) clamp(20px,3vw,48px);
  border-bottom:1px solid var(--edge);
}
.foot-col{min-width:0}
.foot-col-title{
  font-size:11px;font-weight:600;letter-spacing:.18em;color:var(--cyan);
  padding-bottom:10px;margin-bottom:12px;border-bottom:1px solid var(--edge);
}
.foot-list{display:flex;flex-direction:column;gap:8px}
.foot-link{font-size:14px;color:var(--mist);transition:color .16s,padding-left .16s}
.foot-link:hover,.foot-link:focus-visible{color:var(--cyan);padding-left:4px}
.foot-brand-name{font-size:20px;font-weight:900;letter-spacing:-.01em;color:var(--ice)}
.foot-brand-note{margin-top:10px;font-size:13px;color:var(--mist);line-height:1.75;max-width:34ch}

.service-list{display:flex;flex-direction:column;gap:14px}
.service-row{display:grid;grid-template-columns:1fr auto;gap:4px 10px;align-items:center}
.service-label{grid-column:1 / -1;font-size:11px;font-weight:600;letter-spacing:.14em;color:var(--mist)}
.service-value{
  font-family:var(--font-mono);font-size:13px;color:var(--ice);
  line-height:1.6;word-break:break-all;
}
.copy-btn{
  padding:4px 10px;font-size:11px;font-weight:600;letter-spacing:.08em;
  border:1px solid var(--edge);color:var(--mist);background:rgba(30,42,92,.4);
  transition:border-color .16s,color .16s,background .16s;
}
.copy-btn:hover,.copy-btn:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.copy-btn.is-done{border-color:var(--up);color:var(--up)}

.foot-meta{
  display:grid;gap:8px;
  padding:20px clamp(20px,3vw,48px);
  border-bottom:1px solid var(--edge);
  background:rgba(11,21,51,.55);
}
.meta-line{font-size:13px;color:var(--mist);max-width:88ch}
.meta-line--dim{color:rgba(147,165,196,.78)}

.foot-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;
  padding:18px clamp(20px,3vw,48px);
}
.legal-copy{font-size:12px;color:var(--mist);letter-spacing:.02em}
.legal-copy--dim{font-family:var(--font-mono);color:rgba(147,165,196,.7)}
.legal-links{display:flex;flex-wrap:wrap;gap:8px 18px;margin-left:auto}
.legal-links .foot-link{font-size:12px}

/* ============ 11. Breadcrumb / TOC / misc ============ */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist);
  padding-bottom:14px;margin-bottom:20px;border-bottom:1px solid var(--edge);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--edge)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--ice)}

.toc{display:flex;flex-direction:column;gap:2px}
.toc-link{
  display:block;padding:8px 10px;font-size:13px;color:var(--mist);
  border-left:2px solid var(--edge);
  transition:color .16s,border-color .16s,background .16s;
}
.toc-link:hover{color:var(--ice);background:rgba(30,42,92,.4)}
.toc-link.is-active{color:var(--cyan);border-left-color:var(--cyan);background:rgba(0,240,224,.08)}
[data-toc-target]{scroll-margin-top:calc(var(--bar-h) + 32px)}

.data-table{width:100%;font-size:14px;border:2px solid var(--edge);background:rgba(11,21,51,.7)}
.data-table th,.data-table td{padding:11px 13px;text-align:left;border-bottom:1px solid var(--edge)}
.data-table th{font-size:12px;font-weight:600;letter-spacing:.1em;color:var(--mist);background:rgba(30,42,92,.5)}
.data-table td.n{font-family:var(--font-mono);color:var(--cyan);font-weight:700}
.data-table tr:last-child td{border-bottom:0}

.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 9;
  background:var(--panel);border:2px solid var(--edge);
}
.media-frame img,.media-frame video{
  width:100%;height:100%;object-fit:cover;object-position:center;
  filter:saturate(.72) brightness(.86) contrast(1.08);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(120deg,rgba(0,240,224,.24),rgba(122,92,255,.3) 55%,rgba(5,11,31,.76));
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}

/* ============ 12. Motion ============ */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .22s ease-out,transform .22s ease-out}
[data-reveal].is-in{opacity:1;transform:none}

.to-top{
  position:fixed;right:18px;bottom:18px;z-index:70;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 15px;border:2px solid var(--cyan);
  background:rgba(5,11,31,.94);color:var(--cyan);
  font-size:12px;font-weight:700;letter-spacing:.08em;
  transform:translateY(150%);transition:transform .24s ease-out,background .18s,color .18s;
  backdrop-filter:blur(6px);
}
.to-top[data-show="true"]{transform:translateY(0)}
.to-top:hover,.to-top:focus-visible{background:var(--cyan);color:#04101F}

/* ============ 13. Responsive ============ */
@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
  .site-topbar{left:var(--rail-w)}
  .rail-scrim{display:none}
}
@media (max-width:1079px){
  html.nav-open{overflow:hidden}
  .site-rail{
    width:min(300px,86vw);
    transform:translateX(-100%);
    transition:transform .26s cubic-bezier(.2,.8,.2,1);
  }
  .site-rail[data-open="true"]{
    transform:translateX(0);
    box-shadow:14px 0 0 rgba(0,240,224,.08),0 0 60px rgba(0,0,0,.65);
  }
  .site-topbar{padding:0 10px}
  .nav-toggle{display:inline-flex}
  .brand-name{font-size:17px}
}
@media (max-width:960px){
  .grid--5-7,.grid--7-5,.grid--4-5-3,.grid--8-4,
  .grid--halves,.grid--thirds{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-col--brand{grid-column:1 / -1}
  .foot-col--service{grid-column:1 / -1}
}
@media (max-width:680px){
  body{font-size:15px}
  .foot-strip{grid-template-columns:1fr 1fr}
  .strip-cell:nth-child(n){border-left:1px solid var(--edge)}
  .strip-cell:nth-child(odd){border-left:0}
  .foot-grid{grid-template-columns:1fr;padding:26px 18px}
  .foot-meta,.foot-legal{padding:16px 18px}
  .legal-links{margin-left:0}
  .to-top{right:12px;bottom:12px;padding:9px 12px}
  p{max-width:100%}
}

/* ============ 14. Accessibility ============ */
@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{transition:none}
}