/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;padding:0}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0}
[hidden]{display:none!important}
a{color:#3FDCE8;text-decoration:none}

/* ===== tokens ===== */
:root{
  --ink-900:#0A1622;
  --ink-800:#102534;
  --ink-700:#08121C;
  --steel:#1B3A4B;
  --milk:#EDF4F4;
  --rock:#93A9B3;
  --cyan:#3FDCE8;
  --cyan-deep:#1E8E9E;
  --gold:#E9B95E;
  --gold-deep:#B98A2F;
  --glaze:#F7F9F8;
  --char:#0E1216;
  --moss:#8FA98C;
  --clay:#B4684A;
  --band-a:#2A4759;
  --band-b:#54717F;
  --wrap:1240px;
  --gutter:clamp(16px,3vw,32px);
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --shadow-hard:6px 6px 0 rgba(0,0,0,.45);
  --shadow-soft:4px 4px 0 rgba(0,0,0,.35);
  --radius:2px;
}

/* ===== base / 中文排版 ===== */
body{
  font-family:var(--sans);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  color:var(--milk);
  background-color:var(--ink-900);
  background-image:
    linear-gradient(to right,rgba(63,220,232,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(63,220,232,.045) 1px,transparent 1px);
  background-size:96px 96px,96px 96px;
  background-position:center top;
  letter-spacing:.01em;
}
h1,h2,h3,h4{line-height:1.25;letter-spacing:-.01em;font-weight:800}
h1{font-size:clamp(34px,6vw,68px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(19px,2vw,24px);line-height:1.4}
p,li{max-width:38em}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:1px}
#main-content{display:block;scroll-margin-top:120px}
.mono,.num{font-family:var(--mono);font-variant-numeric:tabular-nums}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ===== skip link ===== */
.skip-link{
  position:absolute;left:var(--gutter);top:-72px;z-index:130;
  display:inline-block;padding:12px 18px;
  background:var(--cyan);color:var(--char);font-weight:800;font-size:14px;
  border:2px solid var(--char);box-shadow:var(--shadow-soft);
  transition:top .16s ease;
}
.skip-link:focus{top:10px}

/* ===== scroll progress ===== */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:120;
  background:rgba(27,58,75,.75);pointer-events:none;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  transform:scaleX(0);transform-origin:0 50%;
}

/* ===== header ===== */
.site-header{position:sticky;top:0;z-index:90}
.utility-bar{background:var(--ink-700);border-bottom:1px solid var(--steel)}
.utility-bar__inner{
  max-width:var(--wrap);margin:0 auto;padding:8px var(--gutter);
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  font-size:12px;letter-spacing:.08em;color:var(--rock);
}
.utility-bar__brand{margin:0;color:var(--milk);font-weight:600;letter-spacing:.05em;font-size:12.5px}
.utility-bar__meta{
  margin:0 0 0 auto;display:flex;align-items:center;gap:8px;max-width:none;
  font-family:var(--mono);font-size:12px;color:var(--rock);
}
.utility-bar__dot{color:var(--cyan-deep)}
.member-entry{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 14px;border:1.5px solid var(--gold-deep);border-radius:var(--radius);
  color:var(--gold);font-size:12px;font-weight:800;letter-spacing:.14em;
  background:linear-gradient(180deg,rgba(233,185,94,.16),rgba(233,185,94,.02));
  box-shadow:inset 0 0 0 1px rgba(233,185,94,.1),2px 2px 0 rgba(185,138,47,.25);
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.member-entry:hover,.member-entry:focus-visible{background:var(--gold);border-color:var(--gold);color:var(--char)}

.nav-bar{background:var(--ink-900);border-bottom:2px solid var(--steel)}
.nav-bar__inner{
  max-width:var(--wrap);margin:0 auto;padding:12px var(--gutter);
  display:flex;align-items:center;gap:clamp(14px,2vw,28px);
}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--milk);text-decoration:none}
.brand__mark{
  display:grid;place-items:center;width:44px;height:44px;flex:none;
  border:2px solid var(--cyan);color:var(--cyan);
  background:rgba(63,220,232,.09);font-family:var(--mono);font-size:15px;font-weight:700;
  box-shadow:4px 4px 0 rgba(30,142,158,.35);transform:rotate(-2deg);
}
.brand__text{display:flex;flex-direction:column;gap:1px}
.brand__name{font-size:19px;font-weight:800;letter-spacing:.02em;line-height:1.2}
.brand__sub{font-family:var(--mono);font-size:10px;letter-spacing:.26em;color:var(--rock)}
.brand:hover .brand__name{color:var(--cyan)}

.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:10px 14px;border:2px solid var(--steel);background:var(--ink-800);
  color:var(--milk);font-size:13px;font-weight:700;letter-spacing:.1em;cursor:pointer;
  box-shadow:var(--shadow-soft);
}
.nav-toggle:hover{border-color:var(--cyan-deep);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:4px}
.nav-toggle__bars span{display:block;width:18px;height:2px;background:var(--cyan);transition:transform .18s ease,opacity .18s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{font-size:12px;letter-spacing:.14em}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;list-style:none;gap:clamp(6px,1.2vw,18px);flex-wrap:wrap}
.site-nav__link{
  position:relative;display:inline-block;padding:8px 10px 10px;
  color:var(--milk);font-size:15px;font-weight:500;letter-spacing:.03em;
  transition:color .16s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .18s ease;
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:#fff}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--cyan);font-weight:700}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--gold)}
.site-nav__num{
  font-family:var(--mono);font-size:11px;letter-spacing:0;
  color:var(--rock);margin-right:7px;
}
.site-nav__link:hover .site-nav__num,.site-nav__link[aria-current="page"] .site-nav__num{color:var(--cyan)}

.legacy-toggle{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  padding:8px 14px;border:1.5px dashed var(--cyan-deep);
  background:rgba(30,142,158,.12);color:var(--cyan);
  font-size:12px;font-weight:700;letter-spacing:.12em;cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.legacy-toggle:hover,.legacy-toggle[aria-expanded="true"]{
  background:var(--cyan);border-color:var(--cyan);border-style:solid;color:var(--char);
}

/* ===== legacy panel ===== */
.legacy-panel{
  position:fixed;right:clamp(14px,3vw,40px);bottom:clamp(72px,8vw,100px);z-index:100;
  width:min(360px,calc(100vw - 28px));
  background:var(--ink-800);border:2px solid var(--cyan-deep);
  box-shadow:8px 8px 0 rgba(0,0,0,.5);padding:18px 18px 16px;
}
.legacy-panel__head{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--steel);padding-bottom:10px}
.legacy-panel__title{font-size:15px;font-weight:800;letter-spacing:.04em;color:var(--milk)}
.legacy-panel__close{
  padding:4px 10px;border:1.5px solid var(--steel);color:var(--rock);
  font-size:12px;font-weight:700;letter-spacing:.1em;cursor:pointer;
}
.legacy-panel__close:hover{border-color:var(--cyan);color:var(--cyan)}
.legacy-panel__list{list-style:none;margin:12px 0 0}
.legacy-panel__row{
  display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline;
  padding:9px 0;border-bottom:1px solid rgba(27,58,75,.85);
}
.legacy-panel__old{font-size:13px;color:var(--rock);text-decoration:line-through;text-decoration-color:var(--clay)}
.legacy-panel__new{
  margin-left:auto;font-size:13px;font-weight:700;color:var(--gold);
  font-family:var(--mono);letter-spacing:.02em;
}
.legacy-panel__note{margin:14px 0 0;font-size:12.5px;line-height:1.7;color:var(--rock)}

/* ===== footer ===== */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink-700);border-top:2px solid var(--steel);position:relative;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:5px;
  background:linear-gradient(90deg,var(--band-a),var(--band-b),var(--cyan-deep),var(--gold-deep));
}
.site-footer__inner{
  max-width:var(--wrap);margin:0 auto;
  padding:clamp(34px,5vw,64px) var(--gutter) clamp(20px,3vw,32px);
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);
  gap:clamp(24px,4vw,56px);
}
.site-footer__brand{display:flex;flex-direction:column;gap:8px}
.site-footer__logo{font-size:22px;font-weight:800;letter-spacing:.02em;color:var(--milk)}
.site-footer__tagline{margin:0;font-size:13px;color:var(--rock);letter-spacing:.04em;max-width:22em}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,36px)}
.footer-col{border-left:1px solid var(--steel);padding-left:clamp(12px,2vw,20px)}
.footer-col__title{
  font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.18em;
  color:var(--cyan);margin-bottom:12px;
}
.footer-col__list{list-style:none;display:flex;flex-direction:column;gap:8px}
.footer-col__item{margin:0;font-size:14px;color:var(--rock);line-height:1.7;max-width:24em}
.footer-col__item a{color:var(--milk);border-bottom:1px solid transparent;transition:color .15s ease,border-color .15s ease}
.footer-col__item a:hover,.footer-col__item a:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan-deep)}
.footer-col__item--mono{font-family:var(--mono);font-size:13px;color:var(--milk);word-break:break-all}
.site-footer__note{
  max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter) 20px;
  font-size:13px;line-height:1.8;color:var(--rock);
}
.site-footer__legal{
  max-width:var(--wrap);margin:0 auto;
  padding:18px var(--gutter) 40px;border-top:1px solid var(--steel);
  display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;
  font-size:12px;letter-spacing:.04em;color:var(--rock);
}
.site-footer__legal p{margin:0;max-width:60em}

/* ===== layout ===== */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.section{padding:clamp(40px,6vw,88px) 0}
.section--wide{padding:clamp(56px,8vw,120px) 0}
.section--narrow .wrap{max-width:880px}
.section__head{display:flex;flex-direction:column;gap:12px;margin-bottom:clamp(24px,3.5vw,48px)}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--cyan)}
.section__title{font-weight:800}
.lede{font-size:17px;line-height:1.85;color:#C9D8DA;max-width:34em}
.divider{height:2px;border:0;margin:0;background:linear-gradient(90deg,var(--cyan-deep),rgba(27,58,75,.2) 60%,transparent)}

/* ===== grid ===== */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ===== components ===== */
.prose{font-size:17px;line-height:1.85;color:#D6E3E4;max-width:36em}
.prose p+p{margin-top:1.1em}
.prose h3{margin-top:1.8em;margin-bottom:.5em;color:var(--milk)}
.prose a{color:var(--cyan);border-bottom:1px solid var(--cyan-deep)}
.prose ul,.prose ol{list-style:none;margin-top:.8em}
.prose li{position:relative;padding-left:1.5em;margin-top:.55em;color:#D6E3E4}
.prose li::before{content:"—";position:absolute;left:0;color:var(--cyan-deep)}

.panel{
  background:var(--ink-800);border:2px solid var(--steel);
  padding:clamp(20px,3vw,32px);box-shadow:var(--shadow-hard);
}
.panel--steel{background:linear-gradient(180deg,var(--band-a),var(--ink-800));border-color:var(--band-b)}

.card{
  position:relative;display:block;height:100%;
  background:var(--ink-800);border:2px solid var(--steel);padding:22px;
  color:var(--milk);text-decoration:none;
  transition:border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.card:hover,.card:focus-visible{border-color:var(--cyan-deep);transform:translateY(-3px);box-shadow:var(--shadow-soft)}
.card__meta{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--rock);display:block;margin-bottom:10px}

.index-list{list-style:none;border-top:2px solid var(--steel)}
.index-list__item{
  display:flex;gap:16px;align-items:baseline;
  padding:18px 4px;border-bottom:1px solid var(--steel);
}
.index-list__item:last-child{border-bottom:1px solid var(--steel)}
.index-list__num{
  flex:none;min-width:2.8em;font-family:var(--mono);font-size:13px;
  letter-spacing:.06em;color:var(--cyan);
}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 10px;
  border:1px solid var(--steel);border-radius:var(--radius);
  background:rgba(27,58,75,.45);font-size:12px;letter-spacing:.08em;
  color:var(--rock);white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:var(--cyan-deep)}
.tag--gold{color:var(--gold);border-color:var(--gold-deep);background:rgba(233,185,94,.09)}
.tag--moss{color:var(--moss);border-color:var(--moss);background:rgba(143,169,140,.1)}
.tag--clay{color:var(--clay);border-color:var(--clay);background:rgba(180,104,74,.12)}
.status-dot{display:inline-block;width:8px;height:8px;flex:none;background:var(--rock)}
.status-dot--moss{background:var(--moss)}
.status-dot--clay{background:var(--clay)}
.status-dot--cyan{background:var(--cyan)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;border:2px solid var(--steel);border-radius:var(--radius);
  background:var(--ink-800);color:var(--milk);
  font-size:15px;font-weight:800;letter-spacing:.04em;cursor:pointer;
  box-shadow:var(--shadow-soft);
  transition:transform .12s ease,background-color .16s ease,color .16s ease,border-color .16s ease,box-shadow .12s ease;
}
.btn:hover,.btn:focus-visible{transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(0,0,0,.5)}
.btn:active{transform:translate(0,0);box-shadow:2px 2px 0 rgba(0,0,0,.4)}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:var(--char)}
.btn--cyan:hover,.btn--cyan:focus-visible{background:#63E7F1;border-color:#63E7F1}
.btn--gold{background:transparent;border-color:var(--gold-deep);color:var(--gold)}
.btn--gold:hover,.btn--gold:focus-visible{background:var(--gold);border-color:var(--gold);color:var(--char)}
.btn--ghost{background:transparent;border-color:var(--steel);color:var(--milk);box-shadow:none}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan);transform:none;box-shadow:none}
.btn--block{width:100%}

.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:20px 0 0;font-family:var(--mono);font-size:12px;
  letter-spacing:.08em;color:var(--rock);
}
.crumbs__item{color:var(--rock);border-bottom:1px solid transparent}
a.crumbs__item:hover,a.crumbs__item:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan-deep)}
.crumbs__separator{color:var(--cyan-deep)}

.figure{
  position:relative;margin:0;border:2px solid var(--steel);
  background:linear-gradient(160deg,var(--band-a),var(--ink-800));
  overflow:hidden;
}
.figure__media{
  display:block;width:100%;aspect-ratio:16/9;object-fit:cover;
  background:linear-gradient(160deg,var(--band-a),var(--band-b));
}
.figure__media--empty{
  background-image:
    repeating-linear-gradient(45deg,rgba(63,220,232,.09) 0 12px,transparent 12px 24px),
    linear-gradient(160deg,var(--band-a),var(--band-b));
}
.figure--square .figure__media{aspect-ratio:1/1}
.figure--tall .figure__media{aspect-ratio:3/4}
.figure__caption{
  padding:10px 14px;border-top:1px solid var(--steel);
  background:rgba(10,22,34,.72);font-size:13px;line-height:1.7;color:var(--rock);
}

.filter-bar{display:flex;flex-wrap:wrap;gap:10px;padding:6px 0 18px}
.filter-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border:2px solid var(--steel);border-radius:var(--radius);
  background:var(--ink-800);color:var(--rock);
  font-size:13px;font-weight:700;letter-spacing:.06em;cursor:pointer;
  transition:background-color .15s ease,color .15s ease,border-color .15s ease;
}
.filter-chip:hover,.filter-chip:focus-visible{border-color:var(--cyan-deep);color:var(--milk)}
.filter-chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--char)}
.filter-chip__count{font-family:var(--mono);font-size:11px;opacity:.75}

/* ===== reveal ===== */
.js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .35s ease,transform .35s ease}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ===== responsive ===== */
@media (max-width:1100px){
  .site-footer__inner{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:900px){
  body{font-size:16px}
  .utility-bar__brand{font-size:12px}
  .utility-bar__meta{margin-left:auto;font-size:11px}
  .nav-bar__inner{flex-wrap:wrap;gap:10px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;order:3;flex-basis:100%;margin:4px 0 0;
    padding-top:10px;border-top:1px solid var(--steel);
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;gap:0}
  .site-nav__link{
    display:flex;align-items:center;width:100%;
    padding:13px 6px;border-bottom:1px solid rgba(27,58,75,.9);
    font-size:16px;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{border-left:3px solid var(--gold);padding-left:12px}
  .legacy-toggle{position:fixed;right:14px;bottom:14px;z-index:85;box-shadow:var(--shadow-hard)}
  .legacy-panel{right:14px;left:14px;bottom:70px;width:auto}
  .grid--12{grid-template-columns:1fr}
  .col-4,.col-6,.col-8,.col-12{grid-column:auto}
  .footer-cols{grid-template-columns:1fr;gap:24px}
  .footer-col{border-left:0;padding-left:0;border-top:1px solid var(--steel);padding-top:16px}
  .site-footer__legal{justify-content:flex-start}
}
@media (max-width:560px){
  .utility-bar__meta{width:100%;margin-left:0}
  .utility-bar__brand{width:100%}
  .brand__mark{width:38px;height:38px;font-size:13px}
  .brand__name{font-size:17px}
  .brand__sub{display:none}
  .section{padding:34px 0}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .scroll-progress__bar{transition:none}
}