/* ============================================================
   /assets/site.css —— 共享外壳样式
   色彩体系：深靛底 / 次层面板 / 电光青锚点 / 暖橙速度标注
   ============================================================ */

:root{
  --ink:#070B1E;
  --panel:#0E1430;
  --line:#1C2450;
  --text:#EAF2FF;
  --text-2:#94A2C4;
  --cyan:#00E5D4;
  --cyan-ink:#050A1C;
  --orange:#FF7A3D;
  --blue:#4C6FFF;
  --green:#2AD8A0;
  --dim:#2B3358;

  --rail-w:92px;
  --rail-w-open:240px;
  --pad:clamp(18px,4vw,40px);
  --maxw:1240px;
  --cut:14px;
  --gap:clamp(16px,2.4vw,32px);
  --ease:cubic-bezier(.4,0,.2,1);

  --font-display:"MiSans","HarmonyOS Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  color-scheme:dark;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ol,ul,li,figure,blockquote,dl,dd{margin:0}
ol,ul{padding:0;list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.15;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
button[hidden]{display:none}
img,svg,video{display:block;max-width:100%}
[hidden]{display:none !important}

/* ---------- 中文排版基底 ---------- */
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(880px 620px at 84% -12%,rgba(0,229,212,.10),transparent 62%),
    radial-gradient(760px 560px at -14% 34%,rgba(76,111,255,.13),transparent 66%),
    repeating-linear-gradient(135deg,rgba(234,242,255,.026) 0 1px,transparent 1px 9px);
}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:0;left:0;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--cyan-ink);
  font-weight:700;
  font-size:14px;
  transform:translateY(-140%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ============================================================
   HEADER —— 移动贴顶栏 / 桌面左侧轨道
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px var(--pad);
  background:rgba(7,11,30,.9);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand__mark{
  display:grid;
  place-items:center;
  flex:none;
  width:36px;height:36px;
  background:var(--cyan);
  color:var(--cyan-ink);
  font-family:var(--font-display);
  font-size:18px;
  font-weight:800;
  letter-spacing:0;
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 9px,100% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:-.01em;white-space:nowrap}
.brand__tag{display:none;font-size:11px;line-height:1.5;color:var(--text-2);white-space:nowrap}

/* 导航按钮 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:none;
  padding:9px 14px;
  border:1px solid var(--line);
  background:rgba(14,20,48,.72);
  color:var(--text-2);
  font-size:13px;
  font-weight:500;
  letter-spacing:.06em;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{color:var(--text);border-color:var(--cyan)}
.nav-toggle__lines{position:relative;display:block;flex:none;width:16px;height:10px}
.nav-toggle__lines::before,
.nav-toggle__lines::after{
  content:"";
  position:absolute;left:0;
  width:100%;height:2px;
  background:currentColor;
  transition:transform .25s var(--ease);
}
.nav-toggle__lines::before{top:0}
.nav-toggle__lines::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__lines::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__lines::after{transform:translateY(-4px) rotate(-45deg)}

/* 轨道（移动端为抽屉） */
.rail{
  position:fixed;
  top:0;bottom:0;left:0;
  z-index:70;
  display:flex;
  flex-direction:column;
  gap:16px;
  width:min(320px,86vw);
  padding:22px 14px 20px;
  background:linear-gradient(180deg,#0B1130 0%,#070B1E 78%);
  border-right:1px solid var(--line);
  box-shadow:24px 0 48px rgba(3,6,20,.6);
  overflow-y:auto;
  transform:translateX(-104%);
  transition:transform .32s var(--ease);
}
.rail[data-open="true"]{transform:translateX(0)}

.nav{display:flex;flex-direction:column;gap:12px}
.nav__hint{
  font-size:12px;
  letter-spacing:.08em;
  color:var(--text-2);
  padding-left:4px;
}
.nav__list{display:flex;flex-direction:column;gap:6px}
.nav__link{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  padding:12px 14px;
  color:var(--text-2);
  font-size:15px;
  font-weight:500;
  background:transparent;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.nav__link:hover{background:rgba(234,242,255,.06);color:var(--text)}
.nav__link[aria-current="page"]{
  background:rgba(0,229,212,.12);
  color:var(--text);
  box-shadow:inset 2px 0 0 0 var(--cyan);
}
.nav__index{
  flex:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
  color:var(--dim);
  transition:color .2s var(--ease);
}
.nav__link:hover .nav__index,
.nav__link[aria-current="page"] .nav__index{color:var(--cyan)}
.nav__short{display:none}
.nav__label{display:block}

.rail__foot{margin-top:auto;display:flex;flex-direction:column;gap:12px;padding:16px 4px 0;border-top:1px solid var(--line)}
.rail__meta{font-size:12px;line-height:1.7;color:var(--text-2)}

/* 遮罩 */
.scrim{
  position:fixed;
  inset:0;
  z-index:65;
  background:rgba(5,10,28,.68);
  backdrop-filter:blur(2px);
}

/* 阅读进度 */
.progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(28,36,80,.65);
}
.progress__bar{
  display:block;
  width:100%;height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  transform-origin:left center;
  transform:scaleX(var(--p,0));
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid var(--line);
  background:var(--panel);
  color:var(--text);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  clip-path:polygon(0 0,calc(100% - 11px) 0,100% 11px,100% 100%,0 100%);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px);border-color:var(--cyan)}
.btn--cyan{background:var(--cyan);color:var(--cyan-ink);border-color:transparent}
.btn--cyan:hover{background:#3BF2E3;border-color:transparent}
.btn--sm{padding:9px 14px;font-size:13px;font-weight:600}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(14,20,48,.55),rgba(7,11,30,.95));
}
.site-footer__inner{
  width:min(100% - var(--pad) * 2,var(--maxw));
  margin-inline:auto;
  padding:clamp(36px,5vw,64px) 0 28px;
}
.site-footer__top{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(24px,3vw,40px);
}
.footer-brand__line{
  font-family:var(--font-display);
  font-size:clamp(17px,2vw,20px);
  font-weight:700;
  letter-spacing:-.01em;
}
.footer-brand__hint{
  margin-top:10px;
  font-size:13px;
  line-height:1.8;
  color:var(--text-2);
  max-width:32em;
}
.footer-cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.footer-col__title{
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--cyan);
  padding-bottom:8px;
  border-bottom:1px solid var(--line);
}
.footer-col__list{margin-top:12px;display:flex;flex-direction:column;gap:9px}
.footer-col__link{
  font-size:14px;
  color:var(--text-2);
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-col__link:hover{color:var(--text);padding-left:5px}
.footer-contact{display:flex;flex-direction:column;gap:10px}
.footer-contact__title{
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--orange);
  padding-bottom:8px;
  border-bottom:1px solid var(--line);
}
.footer-contact__row{margin-top:8px}
.copy-btn{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  width:100%;
  padding:10px 12px;
  border:1px solid var(--line);
  background:rgba(14,20,48,.8);
  font-family:var(--font-mono);
  font-size:13px;
  font-variant-numeric:tabular-nums;
  color:var(--text);
  text-align:left;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);background:rgba(0,229,212,.08)}
.copy-btn__value{overflow-wrap:anywhere}
.copy-btn__state{
  flex:none;
  font-family:var(--font-body);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--text-2);
}
.copy-btn:hover .copy-btn__state{color:var(--cyan)}
.footer-contact__note{
  margin-top:6px;
  font-size:12.5px;
  line-height:1.8;
  color:var(--text-2);
  max-width:34em;
}
.site-footer__bottom{
  margin-top:clamp(28px,4vw,48px);
  padding-top:18px;
  border-top:1px solid var(--line);
  display:flex;
  flex-direction:column;
  gap:12px;
  font-size:12.5px;
  color:var(--text-2);
}
.footer-legal{line-height:1.8}
.footer-bottom__side{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.footer-year{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.btn-to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);
  color:var(--text-2);
  font-size:12.5px;
  letter-spacing:.06em;
  background:transparent;
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 9px,100% 100%,0 100%);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.btn-to-top::before{content:"↑";font-family:var(--font-mono);color:var(--cyan)}
.btn-to-top:hover{color:var(--text);border-color:var(--cyan)}

/* ============================================================
   通用页面组件（供页面阶段复用）
   ============================================================ */
.container{
  width:min(100% - var(--pad) * 2,var(--maxw));
  margin-inline:auto;
}
.layout{
  display:grid;
  grid-template-columns:1fr;
  gap:var(--gap);
}
@media (min-width:1024px){
  .layout{grid-template-columns:repeat(12,minmax(0,1fr))}
  .layout__main{grid-column:1 / span 7}
  .layout__aside{grid-column:9 / span 3}
}

.panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--panel);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.panel--flip{
  clip-path:polygon(0 0,100% 0,100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel--glow::after{
  content:"";
  position:absolute;
  right:-10%;bottom:-28%;
  width:72%;aspect-ratio:1;
  background:radial-gradient(circle,rgba(0,229,212,.18),transparent 68%);
  pointer-events:none;
}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:linear-gradient(140deg,#0E1430,#070B1E);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
}
.media > img,
.media > svg{width:100%;height:100%;object-fit:cover}
.media--4x3{aspect-ratio:4 / 3}
.media--1x1{aspect-ratio:1 / 1}
.media--wide{aspect-ratio:21 / 9}
.media__caption{
  display:block;
  margin-top:10px;
  font-size:12.5px;
  color:var(--text-2);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan)}
.section-title{font-size:clamp(1.6rem,3.2vw,2.6rem);letter-spacing:-.02em}
.lead{font-size:18px;line-height:1.8;color:var(--text-2)}
.prose{font-size:16px;line-height:1.75}
.prose p{max-width:34em}
.prose p + p{margin-top:1em}
.prose strong{font-weight:600;color:var(--text)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--text-2);
  clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,0 100%);
}
.tag--cyan{color:var(--cyan);border-color:rgba(0,229,212,.45)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,61,.45)}
.tag--green{color:var(--green);border-color:rgba(42,216,160,.45)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(2rem,5vw,3.4rem);
  font-weight:700;
  line-height:1.05;
  letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;
  color:var(--cyan);
}
.stat__value--orange{color:var(--orange)}
.stat__label{font-size:13px;color:var(--text-2);letter-spacing:.04em}

/* 入场动画 */
[data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* 抽屉打开时锁定页面滚动（移动端） */
@media (max-width:1023px){
  body.is-nav-open{overflow:hidden}
}

/* ============================================================
   平板
   ============================================================ */
@media (min-width:768px){
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
  .site-footer__top{grid-template-columns:1fr}
  .brand__tag{display:block}
}

/* ============================================================
   桌面 —— 左侧轨道导航
   ============================================================ */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}

  .site-header{
    position:fixed;
    top:0;bottom:0;left:0;
    z-index:60;
    width:var(--rail-w);
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:0;
    background:linear-gradient(180deg,#0B1130 0%,#070B1E 72%);
    border-bottom:0;
    border-right:1px solid var(--line);
    backdrop-filter:none;
    transition:width .3s var(--ease),box-shadow .3s var(--ease);
  }
  .site-header[data-expanded="true"]{
    width:var(--rail-w-open);
    box-shadow:18px 0 42px rgba(3,6,20,.55);
  }

  .brand{
    flex-direction:column;
    gap:10px;
    padding:22px 8px 16px;
    text-align:center;
    border-bottom:1px solid var(--line);
  }
  .brand__text{display:none}
  .site-header[data-expanded="true"] .brand{
    flex-direction:row;
    text-align:left;
    padding:22px 18px 16px;
  }
  .site-header[data-expanded="true"] .brand__text{display:flex}

  .nav-toggle{
    order:2;
    margin:12px 10px 4px;
    justify-content:center;
  }

  .rail{
    order:3;
    position:static;
    transform:none;
    width:auto;
    flex:1;
    min-height:0;
    padding:12px 10px 18px;
    background:transparent;
    border-right:0;
    box-shadow:none;
    overflow-y:auto;
  }
  .nav__hint{padding:0 4px 8px;font-size:11px;line-height:1.6}
  .nav__list{gap:4px}
  .nav__link{
    flex-direction:column;
    justify-content:center;
    gap:7px;
    padding:12px 4px;
  }
  .nav__label{display:none}
  .nav__short{
    display:block;
    writing-mode:vertical-rl;
    letter-spacing:.18em;
    font-size:13px;
    line-height:1;
  }
  .site-header[data-expanded="true"] .nav__link{
    flex-direction:row;
    justify-content:flex-start;
    gap:12px;
    padding:11px 14px;
  }
  .site-header[data-expanded="true"] .nav__label{display:block}
  .site-header[data-expanded="true"] .nav__short{display:none}

  .rail__foot{margin-top:auto;padding:14px 4px 0}
  .rail__meta{display:none}
  .site-header[data-expanded="true"] .rail__meta{display:block}
  .rail__foot .btn{width:100%}
  .site-header:not([data-expanded="true"]) .rail__foot .btn{padding:9px 6px;font-size:12.5px}

  .scrim{display:none}

  .progress{
    left:auto;right:-1px;top:0;bottom:0;
    width:2px;height:auto;
  }
  .progress__bar{
    transform-origin:top center;
    transform:scaleY(var(--p,0));
    background:linear-gradient(180deg,var(--cyan),var(--blue));
  }

  .site-footer{margin-left:0}
  .site-footer__top{
    grid-template-columns:minmax(0,1.15fr) minmax(0,2fr) minmax(0,1fr);
    align-items:start;
  }
  .site-footer__bottom{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
  }
}

@media (min-width:1280px){
  .brand__tag{font-size:11.5px}
}

/* ---------- 动效降级 ---------- */
@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 !important;transform:none !important}
  .rail{transition:none}
  .progress__bar{transition:none}
}