/* ==== 01 reset ==== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;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;padding:0;cursor:pointer}
address{font-style:normal}

/* ==== 02 tokens ==== */
:root{
  --ink:#070B1A;          /* 深空蓝黑 */
  --layer:#0E1530;        /* 夜航层 */
  --line:#1E2A47;         /* 星图线 */
  --nebula:#7A5CFF;       /* 星云紫 */
  --cyan:#3FE0D0;         /* 荧光青 */
  --amber:#FF8A3D;        /* 暖橙 */
  --cream:#F2EAD8;        /* 画册奶油 */
  --ink-brown:#14100C;    /* 深棕黑墨 */
  --silver:#C9D4E8;       /* 正文银 */
  --white:#FFFFFF;
  --mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --shell:1240px;
  --gutter:20px;
  --header-h:76px;
}

/* ==== 03 base type ==== */
body{
  background:var(--ink);
  color:var(--silver);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (min-width:900px){body{font-size:17px;line-height:1.8}}
@media (min-width:1200px){body{font-size:18px}}
h1,h2,h3,h4{color:var(--white);font-weight:900;line-height:1.16;letter-spacing:-.015em}
::selection{background:var(--nebula);color:var(--white)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ==== 04 skip link ==== */
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--cyan);color:var(--ink-brown);
  font-weight:700;font-size:14px;padding:10px 18px;
}
.skip-link:focus{left:12px;top:8px}

/* ==== 05 header ==== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,11,26,.94);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  transition:background-color .3s ease,box-shadow .3s ease;
}
.site-header[data-scrolled]{background:rgba(7,11,26,.99);box-shadow:0 14px 34px rgba(0,0,0,.5)}

.scale-strip{
  position:relative;display:flex;align-items:center;gap:14px;
  height:30px;padding:0 var(--gutter);
  border-bottom:1px solid rgba(30,42,71,.75);
  background:linear-gradient(90deg,rgba(122,92,255,.10),rgba(7,11,26,0) 45%,rgba(63,224,208,.08));
}
.scale-strip__clock{
  font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--amber);
}
.scale-strip__clock::after{content:"";display:inline-block;width:5px;height:5px;background:var(--amber);margin-left:7px;vertical-align:middle}
.scale-strip__label{
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:rgba(201,212,232,.45);
}
.scale-strip__ticks{
  position:relative;flex:1;height:8px;min-width:40px;
  background-image:repeating-linear-gradient(to right,var(--line) 0 1px,transparent 1px 16px);
  background-position:0 50%;background-size:16px 8px;background-repeat:repeat-x;
}
.scale-strip__progress{
  position:absolute;left:0;bottom:0;width:100%;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--nebula));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .15s linear;
}

.header-inner{
  display:flex;align-items:stretch;justify-content:space-between;gap:20px;
  max-width:var(--shell);margin:0 auto;padding:0 var(--gutter);
  min-height:var(--header-h);
}
.brand{
  display:flex;flex-direction:column;justify-content:center;gap:5px;
  padding:12px 0;min-width:0;
}
.brand__mark{
  font-size:22px;font-weight:900;letter-spacing:.06em;color:var(--white);line-height:1;
}
.brand__mark::after{
  content:"";display:inline-block;width:6px;height:6px;background:var(--cyan);
  margin-left:9px;vertical-align:middle;
}
.brand__domain{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--nebula);
}
.brand:hover .brand__domain{color:var(--cyan)}

.site-nav{display:flex;align-items:stretch}
.nav-index{display:flex;align-items:stretch}
.nav-index__item{display:flex}
.nav-index__link{
  position:relative;display:flex;align-items:center;gap:8px;
  min-height:var(--header-h);padding:0 16px;
  font-size:15px;color:var(--silver);
  border-left:1px solid rgba(30,42,71,.7);
  transition:color .2s ease,background-color .2s ease;
}
.nav-index__num{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  color:rgba(201,212,232,.35);
  transition:color .2s ease;
}
.nav-index__link:hover{color:var(--white);background:rgba(122,92,255,.12)}
.nav-index__link:hover .nav-index__num{color:var(--cyan)}
.nav-index__link[aria-current="page"]{color:var(--white)}
.nav-index__link[aria-current="page"] .nav-index__num{color:var(--amber)}
.nav-index__link[aria-current="page"]::after{
  content:"";position:absolute;left:16px;right:16px;bottom:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--nebula));
}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--cyan);
  border:1px solid var(--line);padding:9px 12px;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:1px;background:currentColor;transition:transform .25s ease,opacity .25s ease}
.nav-toggle[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(4px) rotate(45deg)}
.nav-toggle[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-4px) rotate(-45deg)}

.header-rule{
  display:block;height:1px;
  background:linear-gradient(90deg,transparent,var(--nebula) 18%,var(--cyan) 50%,var(--nebula) 82%,transparent);
  opacity:.65;
}

/* ==== 06 footer ==== */
.site-footer{
  position:relative;
  background:var(--ink);
  border-top:1px solid var(--line);
  padding:52px 0 22px;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--nebula),var(--cyan),transparent);
  opacity:.8;
}
.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1.5fr;
  gap:34px 28px;
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--mono);font-size:11px;font-weight:400;letter-spacing:.22em;
  color:var(--cyan);margin-bottom:16px;
}
.footer-brand{
  font-size:21px;font-weight:900;letter-spacing:.06em;color:var(--white);margin-bottom:10px;
}
.footer-note{font-size:14.5px;line-height:1.8;color:var(--silver);max-width:34ch;margin-bottom:14px}
.update-chip{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--amber);
  border:1px solid rgba(255,138,61,.45);padding:5px 10px;
}
.update-chip::before{content:"";width:6px;height:6px;background:var(--amber)}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-flex;align-items:baseline;gap:9px;
  font-size:15px;color:var(--silver);
  transition:color .2s ease;
}
.footer-link:hover{color:var(--cyan)}
.footer-index-num{font-family:var(--mono);font-size:11px;color:rgba(201,212,232,.4)}
.footer-contact{display:grid;gap:10px}
.footer-contact__row{display:grid;grid-template-columns:44px 1fr;gap:8px;align-items:baseline}
.footer-contact__label{
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:rgba(201,212,232,.45);
}
.footer-contact__value{font-size:14.5px;line-height:1.7;color:var(--silver);word-break:break-word}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 24px;
  margin-top:38px;padding-top:16px;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:rgba(201,212,232,.6);
}
.footer-icp{color:rgba(201,212,232,.75)}

/* ==== 07 layout ==== */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.section{padding:56px 0;position:relative}
.section--tight{padding:36px 0}
.section--wide{padding:80px 0}
@media (min-width:900px){
  .section{padding:84px 0}
  .section--tight{padding:48px 0}
  .section--wide{padding:112px 0}
}
.section__head{display:grid;gap:12px;max-width:760px;margin-bottom:34px}
.section__index{
  font-family:var(--mono);font-size:12px;letter-spacing:.24em;color:var(--cyan);
}
.section__title{font-size:clamp(26px,3.4vw,40px)}
.section__lead{font-size:17px;line-height:1.8;color:var(--silver);max-width:62ch}

.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.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-9{grid-column:span 9}
.col-12{grid-column:span 12}
@media (max-width:1020px){
  .col-4,.col-5,.col-6,.col-7,.col-8,.col-9{grid-column:span 12}
}
.dark-hold{
  position:relative;min-height:120px;background:var(--ink);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.dark-hold::before{
  content:"";position:absolute;left:0;right:0;top:50%;height:1px;
  background:repeating-linear-gradient(to right,var(--line) 0 1px,transparent 1px 22px);
}

/* ==== 08 breadcrumb ==== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:16px 0;font-family:var(--mono);font-size:12px;
  letter-spacing:.06em;color:rgba(201,212,232,.55);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{color:var(--silver);transition:color .2s ease}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__sep{color:var(--line)}

/* ==== 09 buttons ==== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 22px;font-size:15px;font-weight:700;letter-spacing:.02em;
  border:1px solid transparent;border-radius:0;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn--primary{background:var(--nebula);color:var(--white);box-shadow:0 0 24px rgba(122,92,255,.35)}
.btn--primary:hover{background:#8b70ff}
.btn--ghost{background:transparent;color:var(--cyan);border-color:rgba(63,224,208,.5)}
.btn--ghost:hover{background:rgba(63,224,208,.12);border-color:var(--cyan)}
.btn--label{background:var(--cream);color:var(--ink-brown);font-family:var(--mono);letter-spacing:.1em}
.btn--label:hover{background:#fff}

/* ==== 10 plate / tag / data ==== */
.plate{
  background:var(--cream);color:var(--ink-brown);
  border-left:3px solid var(--amber);padding:15px 18px;
}
.plate__label{
  display:block;font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  color:rgba(20,16,12,.6);margin-bottom:6px;
}
.plate__text{font-size:13.5px;line-height:1.75;margin:0}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  padding:4px 10px;border:1px solid var(--line);
  background:rgba(14,21,48,.85);color:var(--silver);
}
.tag--time{color:var(--amber);border-color:rgba(255,138,61,.45)}
.tag--live{color:var(--cyan);border-color:rgba(63,224,208,.45)}
.tag--expert{color:var(--nebula);border-color:rgba(122,92,255,.5)}
.data-num{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ==== 11 media frame ==== */
.media-frame{
  position:relative;display:block;overflow:hidden;
  background:var(--layer);border:1px solid var(--line);
}
.media-frame__img{
  display:block;width:100%;height:100%;object-fit:cover;
  aspect-ratio:16/9;filter:saturate(.95) contrast(1.06) brightness(.92);
}
.media-frame--wide .media-frame__img{aspect-ratio:21/9}
.media-frame--tall .media-frame__img{aspect-ratio:4/5}
.media-frame__tag{
  position:absolute;top:0;left:0;z-index:2;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  background:var(--amber);color:var(--ink-brown);padding:5px 9px;
}
.media-frame__caption{
  margin-top:10px;background:var(--cream);color:var(--ink-brown);
  font-size:13px;line-height:1.7;padding:10px 12px;border-left:2px solid var(--nebula);
}
.media-frame--empty{display:grid;place-items:center;min-height:220px;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:44px 44px;background-position:0 0}
.media-frame--empty::after{
  content:"IMAGE / 待置入";font-family:var(--mono);font-size:11px;letter-spacing:.2em;
  color:rgba(201,212,232,.45);
}

/* ==== 12 timeline ==== */
.timeline{position:relative;padding-left:26px;border-left:1px solid var(--line)}
.timeline__item{position:relative;padding-bottom:26px}
.timeline__item:last-child{padding-bottom:0}
.timeline__item::before{
  content:"";position:absolute;left:-31px;top:7px;width:8px;height:8px;
  background:var(--ink);border:1px solid var(--cyan);
}
.timeline__time{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--amber)}
.timeline__title{font-size:17px;font-weight:700;color:var(--white);margin:4px 0 6px}
.timeline__text{font-size:15px;line-height:1.8;color:var(--silver)}

/* ==== 13 disclosure ==== */
.disclosure{margin-top:12px}
.disclosure__btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  color:var(--cyan);border:1px solid var(--line);padding:6px 12px;
  transition:border-color .2s ease,background-color .2s ease;
}
.disclosure__btn:hover{border-color:var(--cyan);background:rgba(63,224,208,.08)}
.disclosure__btn[aria-expanded="true"]{background:rgba(63,224,208,.12);border-color:var(--cyan)}
.disclosure__panel{
  margin-top:12px;padding-left:14px;border-left:1px solid var(--line);
  font-size:14.5px;line-height:1.8;color:var(--silver);
}
.disclosure__panel[hidden]{display:none}

/* ==== 14 reveal ==== */
html.js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s ease,transform .5s ease;
  will-change:opacity,transform;
}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ==== 15 responsive header / footer ==== */
@media (max-width:1080px){
  .header-inner{flex-wrap:nowrap;align-items:center;min-height:64px;gap:12px}
  .brand{padding:8px 0}
  .brand__mark{font-size:19px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;
    background:var(--ink);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    padding:6px var(--gutter) 20px;
    max-height:calc(100vh - 96px);overflow-y:auto;
  }
  .site-nav[data-open]{display:block}
  .nav-index{flex-direction:column;align-items:stretch}
  .nav-index__item{border-bottom:1px solid var(--line)}
  .nav-index__item:last-child{border-bottom:0}
  .nav-index__link{min-height:0;padding:16px 6px;border-left:0;font-size:16px}
  .nav-index__link:hover{background:rgba(122,92,255,.1)}
  .nav-index__link[aria-current="page"]::after{
    left:0;right:auto;top:0;bottom:0;width:2px;height:auto;
    background:linear-gradient(180deg,var(--cyan),var(--nebula));
  }
}
@media (max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:620px){
  :root{--gutter:16px}
  .scale-strip__label{display:none}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-contact__row{grid-template-columns:1fr;gap:2px}
  .footer-contact__label{margin-top:6px}
}

/* ==== 16 reduced motion ==== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js [data-reveal]{opacity:1;transform:none;transition:none}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .scale-strip__progress{transition:none}
}