*,*::before,*::after{box-sizing:border-box}

:root{
  --bg:#070B14;
  --bg-2:#0E1830;
  --rail-bg:#131F3A;
  --green:#3BFF9E;
  --orange:#FF7A2F;
  --teal:#25E5D0;
  --violet:#8E7BFF;
  --ink:#EAF1FF;
  --muted:#93A3BF;
  --dim:#5C6C88;
  --paper:#F3EFE6;
  --line:#22304E;
  --rail-w:84px;
  --top-h:56px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Roboto Mono","Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html{background:#070B14;-webkit-text-size-adjust:100%}

body{
  margin:0;
  padding-top:var(--top-h);
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:2px}
::selection{background:var(--green);color:#04140C}

main{display:block}
#main-content{display:block}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:10px;top:10px;z-index:140;
  padding:10px 18px;
  background:var(--green);color:#04140C;
  font-size:13px;font-weight:700;letter-spacing:.06em;
  border-radius:2px;
  transform:translateY(-220%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- header shell ---------- */
.site-header{position:relative;z-index:80}

.topbar{
  position:fixed;top:0;left:0;right:0;
  height:var(--top-h);z-index:60;
  display:flex;align-items:center;gap:14px;
  padding:0 14px;
  background:rgba(9,14,26,.92);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}

.topbar__brand{display:inline-flex;align-items:center;gap:10px;margin-right:auto;min-width:0}
.topbar__mark{
  display:grid;place-items:center;flex:none;
  width:28px;height:28px;border-radius:2px;
  background:var(--green);color:#04140C;
  font-size:15px;font-weight:900;line-height:1;
}
.topbar__name{font-size:14px;font-weight:800;letter-spacing:.14em;white-space:nowrap}
.topbar__tag{
  display:none;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--dim);
}

.season-chip{
  display:inline-flex;align-items:center;gap:7px;flex:none;
  padding:5px 11px;border:1px solid var(--line);border-radius:2px;
  background:rgba(14,24,48,.75);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--muted);
  white-space:nowrap;
}
.season-chip__dot{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(59,255,158,.16);flex:none}
.season-chip__more{color:var(--dim)}

.topbar__link{
  display:none;align-items:center;
  padding:8px 16px;border:1px solid rgba(59,255,158,.5);border-radius:2px;
  background:rgba(59,255,158,.07);color:var(--green);
  font-size:12.5px;letter-spacing:.12em;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.topbar__link:hover{background:var(--green);color:#04140C;border-color:var(--green)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;flex:none;
  padding:8px 12px;border:1px solid var(--line);border-radius:2px;
  background:rgba(19,31,58,.7);color:var(--ink);
  font-size:12px;letter-spacing:.16em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--green);color:var(--green)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:1.5px;
  background:currentColor;
  transition:transform .24s var(--ease),top .24s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.site-header[data-open] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* ---------- rail navigation ---------- */
.rail{
  position:fixed;top:var(--top-h);left:0;bottom:0;
  width:min(76vw,272px);z-index:62;
  display:flex;flex-direction:column;align-items:stretch;
  gap:16px;padding:18px 16px 22px;
  background:#0C1426;
  border-right:1px solid var(--line);
  overflow-y:auto;
  transform:translateX(-102%);
  transition:transform .3s var(--ease);
}
.site-header[data-open] .rail{transform:translateX(0)}

.rail__brand{display:none}

.rail__list{display:flex;flex-direction:column;gap:2px;width:100%}

.rail__link{
  display:flex;flex-direction:row;align-items:center;gap:14px;
  padding:13px 10px;
  border-left:2px solid transparent;
  color:var(--muted);
  font-size:15px;letter-spacing:.12em;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.rail__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--dim);transition:color .2s var(--ease)}
.rail__label{font-size:15px;letter-spacing:.12em}
.rail__link:hover{color:var(--ink);background:rgba(59,255,158,.06);border-left-color:rgba(59,255,158,.5)}
.rail__link:hover .rail__num{color:var(--green)}
.rail__link[aria-current="page"]{
  color:var(--green);
  background:linear-gradient(90deg,rgba(59,255,158,.16),rgba(59,255,158,0));
  border-left-color:var(--green);
}
.rail__link[aria-current="page"] .rail__num{color:var(--green)}

.rail__foot{
  margin-top:auto;padding-top:16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--dim);
}

.rail-scrim{
  position:fixed;inset:0;z-index:58;
  background:rgba(4,7,14,.68);
  opacity:0;visibility:hidden;
  transition:opacity .28s var(--ease),visibility .28s var(--ease);
}
.site-header[data-open] .rail-scrim{opacity:1;visibility:visible}

@media (max-width:520px){
  .season-chip__more{display:none}
  .topbar__name{font-size:13px;letter-spacing:.08em}
}
@media (max-width:1023px){
  body[data-nav-open]{overflow:hidden}
}
@media (min-width:640px){
  .topbar{padding:0 22px}
  .nav-toggle__label{display:inline}
}
@media (min-width:1024px){
  body{padding-top:64px;padding-left:var(--rail-w)}
  .topbar{left:var(--rail-w);height:64px;padding:0 28px;gap:20px}
  .topbar__link{display:inline-flex}
  .nav-toggle{display:none}
  .rail-scrim{display:none}
  .rail{
    top:0;bottom:0;width:var(--rail-w);
    align-items:center;gap:14px;padding:16px 0 18px;
    background:linear-gradient(180deg,#111C34 0%,#0A1122 60%,#070B14 100%);
    transform:none;transition:none;overflow-y:auto;
  }
  .rail__brand{
    display:flex;flex-direction:column;align-items:center;gap:8px;
    width:60px;padding:2px 0 14px;
    border-bottom:1px solid var(--line);
  }
  .rail__mark{
    display:grid;place-items:center;
    width:40px;height:40px;border-radius:3px;
    background:var(--green);color:#04140C;
    font-size:22px;font-weight:900;line-height:1;
    box-shadow:0 0 0 1px rgba(59,255,158,.35),0 0 22px rgba(59,255,158,.18);
    transition:box-shadow .22s var(--ease);
  }
  .rail__brand:hover .rail__mark{box-shadow:0 0 0 1px rgba(59,255,158,.6),0 0 30px rgba(59,255,158,.32)}
  .rail__word{font-family:var(--font-mono);font-size:9px;letter-spacing:.2em;color:var(--dim)}
  .rail__list{width:100%;gap:0}
  .rail__link{
    flex-direction:column;align-items:center;gap:5px;
    padding:9px 4px;
    font-size:12px;
  }
  .rail__label{writing-mode:vertical-rl;font-size:12px;letter-spacing:.24em}
  .rail__foot{
    writing-mode:vertical-rl;margin-top:auto;padding-top:0;
    letter-spacing:.28em;
  }
}
@media (min-width:1200px){
  .topbar__tag{display:inline}
}

/* ---------- container & grid ---------- */
.u-container{width:100%;max-width:1240px;margin:0 auto;padding:0 18px}
@media (min-width:768px){.u-container{padding:0 32px}}
@media (min-width:1024px){.u-container{padding:0 44px}}

.grid{display:grid;gap:18px;grid-template-columns:repeat(4,minmax(0,1fr))}
@media (min-width:768px){.grid{gap:22px}}
@media (min-width:1024px){.grid{grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}}

.span-4,.span-6,.span-8,.span-12{grid-column:1 / -1}
@media (min-width:1024px){
  .span-4{grid-column:span 4}
  .span-6{grid-column:span 6}
  .span-8{grid-column:span 8}
  .span-12{grid-column:span 12}
}

/* ---------- typography helpers ---------- */
.prose{max-width:62ch;font-size:16.5px;line-height:1.78;color:var(--ink)}
.prose p+p{margin-top:1em}
.prose a{color:var(--green);border-bottom:1px solid rgba(59,255,158,.35);transition:border-color .22s var(--ease)}
.prose a:hover{border-color:var(--green)}

/* ---------- section head ---------- */
.section-head{
  display:flex;flex-direction:column;gap:10px;
  padding-bottom:24px;margin-bottom:28px;
  border-bottom:1px solid var(--line);
}
.section-head__index{font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;color:var(--green)}
.section-head__title{font-size:clamp(28px,5vw,44px);font-weight:800;line-height:1.14;letter-spacing:-.01em}
.section-head__desc{max-width:62ch;font-size:15px;color:var(--muted)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border:1px solid var(--line);border-radius:2px;
  background:transparent;color:var(--ink);
  font-size:14px;letter-spacing:.08em;line-height:1.2;
  transition:background .22s var(--ease),border-color .22s var(--ease),color .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{border-color:var(--green);color:var(--green)}
.btn--solid{background:var(--green);border-color:var(--green);color:#04140C;font-weight:700}
.btn--solid:hover{background:#5CFFB4;border-color:#5CFFB4;color:#04140C}
.btn--ghost{background:rgba(19,31,58,.6)}
.btn--ghost:hover{background:rgba(59,255,158,.1)}

/* ---------- chips ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);border-radius:2px;
  background:rgba(14,24,48,.7);color:var(--muted);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
}
.chip--green{color:var(--green);border-color:rgba(59,255,158,.45);background:rgba(59,255,158,.08)}
.chip--orange{color:var(--orange);border-color:rgba(255,122,47,.45);background:rgba(255,122,47,.08)}
.chip--teal{color:var(--teal);border-color:rgba(37,229,208,.45);background:rgba(37,229,208,.08)}
.chip--violet{color:var(--violet);border-color:rgba(142,123,255,.45);background:rgba(142,123,255,.08)}

.tag-strip{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:22px 0 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.breadcrumb__link{border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--green);border-bottom-color:var(--green)}
.breadcrumb__sep{opacity:.5}

/* ---------- cards ---------- */
.card{
  position:relative;
  display:flex;flex-direction:column;gap:12px;
  padding:22px 20px 24px;
  background:var(--bg-2);
  border:1px solid var(--line);
  border-radius:3px;
  transition:border-color .22s var(--ease),background .22s var(--ease),transform .22s var(--ease);
}
.card::before{content:"";position:absolute;left:0;top:0;width:26px;height:2px;background:var(--green);opacity:.85}
.card:hover{border-color:rgba(59,255,158,.5);background:#101C38;transform:translateY(-2px)}
.card__index{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--dim)}
.card__title{font-size:19px;font-weight:700;line-height:1.35}
.card__text{font-size:14.5px;color:var(--muted)}
.card__meta{
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;
  margin-top:auto;padding-top:12px;
  border-top:1px dashed var(--line);
}

/* ---------- paper card ---------- */
.paper-card{
  position:relative;
  padding:20px 20px 22px;
  background:var(--paper);color:#16202F;
  border-radius:2px;
  box-shadow:6px 6px 0 rgba(19,31,58,.85);
}
.paper-card::after{content:"";position:absolute;inset:6px;border:1px solid rgba(7,11,20,.16);pointer-events:none}
.paper-card__label{
  display:block;margin-bottom:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:#4A5670;text-transform:uppercase;
}

/* ---------- media frame ---------- */
.media-frame{
  position:relative;width:100%;overflow:hidden;
  aspect-ratio:16 / 9;
  background:linear-gradient(135deg,#0E1830 0%,#131F3A 55%,#0A1122 100%);
  border:1px solid var(--line);border-radius:3px;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(59,255,158,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(59,255,158,.07) 1px,transparent 1px);
  background-size:28px 28px;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame__inner{
  position:absolute;inset:0;
  display:grid;place-items:center;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--dim);
}
.media-frame__inner img{width:100%;height:100%;object-fit:cover}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted);
  background:linear-gradient(180deg,rgba(7,11,20,0),rgba(7,11,20,.92));
}

/* ---------- data figure ---------- */
.data-figure{
  display:flex;flex-direction:column;gap:12px;
  padding:18px;
  background:var(--bg-2);border:1px solid var(--line);border-radius:3px;
}
.data-figure__canvas{position:relative;min-height:120px}
.data-figure__canvas svg{width:100%;height:auto;display:block}
.data-figure__legend{
  display:flex;flex-wrap:wrap;gap:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(6px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- back to top ---------- */
.back-top{
  position:fixed;right:16px;bottom:18px;z-index:70;
  width:42px;height:42px;
  display:grid;place-items:center;
  background:rgba(19,31,58,.92);
  border:1px solid var(--line);border-radius:2px;
  color:var(--muted);
  font-family:var(--font-mono);font-size:15px;line-height:1;
  opacity:0;visibility:hidden;
  transition:opacity .25s var(--ease),visibility .25s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.back-top.is-visible{opacity:1;visibility:visible}
.back-top:hover{border-color:var(--green);color:var(--green)}
@media (min-width:1024px){.back-top{right:28px;bottom:28px;width:46px;height:46px}}

/* ---------- footer ---------- */
.site-footer{
  margin-top:88px;
  background:linear-gradient(180deg,#0A1122 0%,#070B14 100%);
  border-top:1px solid var(--line);
  color:var(--muted);
}

.archive-band{border-bottom:1px solid var(--line);background:rgba(14,24,48,.5)}
.archive-band__inner{display:flex;flex-wrap:wrap;padding-left:18px;padding-right:18px}
@media (min-width:768px){.archive-band__inner{padding-left:32px;padding-right:32px}}
@media (min-width:1024px){.archive-band__inner{padding-left:44px;padding-right:44px}}
.archive-band__item{
  display:flex;align-items:center;gap:8px;
  padding:12px 18px 12px 0;
  margin-right:18px;
  font-size:12.5px;letter-spacing:.04em;color:var(--muted);
  border-right:1px solid var(--line);
  padding-right:18px;
}
.archive-band__item:last-child{border-right:0;margin-right:0;padding-right:0}
.archive-band__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--green)}

.footer__inner{
  display:grid;gap:32px;
  grid-template-columns:1fr;
  padding-top:46px;padding-bottom:40px;
}
@media (min-width:700px){.footer__inner{grid-template-columns:1fr 1fr}}
@media (min-width:1024px){.footer__inner{grid-template-columns:1.7fr 1fr 1fr 1.5fr;gap:40px}}

.footer__brand{display:flex;flex-direction:column;gap:10px}
.footer__mark{
  display:grid;place-items:center;
  width:44px;height:44px;border-radius:3px;
  background:var(--green);color:#04140C;
  font-size:22px;font-weight:900;line-height:1;
}
.footer__name{font-size:22px;font-weight:800;letter-spacing:.08em;color:var(--ink)}
.footer__line{max-width:36ch;font-size:13.5px;line-height:1.7;color:var(--muted)}

.footer__col{display:flex;flex-direction:column}
.footer__head{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;
  color:var(--teal);text-transform:uppercase;
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__list a{
  position:relative;display:inline-block;
  font-size:14.5px;color:var(--muted);
  transition:color .2s var(--ease);
}
.footer__list a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;
  background:var(--green);
  transform:scaleX(0);transform-origin:left;
  transition:transform .24s var(--ease);
}
.footer__list a:hover{color:var(--ink)}
.footer__list a:hover::after{transform:scaleX(1)}

.footer__contact{display:flex;flex-direction:column;gap:9px;font-size:14px;color:var(--muted)}
.footer__mail{font-family:var(--font-mono);font-size:13.5px;letter-spacing:.02em;color:var(--ink);word-break:break-all}
.footer__tel{font-family:var(--font-mono);font-size:17px;letter-spacing:.06em;color:var(--green)}
.footer__addr{line-height:1.6}
.footer__note{font-size:12.5px;color:var(--dim)}

.footer__base{border-top:1px solid var(--line);padding:18px 0}
.footer__base .u-container{
  display:flex;flex-wrap:wrap;gap:10px 24px;
  align-items:center;justify-content:space-between;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--dim);
}
.footer__icp{color:var(--dim)}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
  .card:hover{transform:none}
}