/* ============ 1. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd,pre{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ============ 2. Tokens ============ */
:root{
  --space-0:#03050D;
  --space-1:#070B18;
  --space-2:#0E1730;
  --panel:#141F3D;
  --violet:#7A5CFF;
  --cyan:#35E6E0;
  --gold:#F5B94C;
  --red:#FF5A5F;
  --ink:#F4F7FF;
  --ink-dim:#A9B6D9;
  --line:#2A3A66;
  --line-soft:rgba(42,58,102,.55);
  --r-lg:28px;
  --r-md:18px;
  --r-sm:12px;
  --r-pill:999px;
  --wrap:1240px;
  --gutter:clamp(18px,4vw,40px);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-panel:0 26px 60px -40px rgba(3,5,13,.95);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ============ 3. 中文排版与基础 ============ */
html{scroll-behavior:smooth}
body{
  min-height:100%;
  background-color:var(--space-1);
  background-image:
    radial-gradient(920px 540px at 84% -10%,rgba(122,92,255,.20),transparent 66%),
    radial-gradient(760px 460px at 4% 2%,rgba(53,230,224,.10),transparent 70%),
    radial-gradient(1200px 700px at 50% 118%,rgba(20,31,61,.85),transparent 72%);
  background-repeat:no-repeat;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{font-weight:900;line-height:1.14;letter-spacing:-.015em;color:var(--ink)}
h1{font-size:clamp(2.2rem,5vw,3.4rem)}
h2{font-size:clamp(1.6rem,3.2vw,2.25rem)}
h3{font-size:clamp(1.1rem,1.8vw,1.4rem)}
h4{font-size:1.05rem}
p{line-height:1.85}
strong{color:var(--ink);font-weight:800}
small{font-size:.84rem}
code,kbd,samp,time{font-family:var(--font-mono);font-size:.92em;letter-spacing:.04em}
#main-content{display:block}
::selection{background:rgba(53,230,224,.28);color:var(--ink)}

:where(a,button,[tabindex],summary):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:8px;
}

/* ============ 4. 布局工具 ============ */
.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(44px,7vw,96px)}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--sidebar{grid-template-columns:minmax(0,1.6fr) minmax(230px,.9fr)}

/* ============ 5. Skip link ============ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  display:inline-block;padding:10px 20px;
  border-radius:var(--r-pill);
  background:var(--cyan);color:#04121A;
  font-weight:800;font-size:.9rem;letter-spacing:.04em;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
  box-shadow:0 14px 30px -18px rgba(53,230,224,.9);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline-offset:4px}

/* ============ 6. Header ============ */
.site-header{
  position:sticky;top:0;z-index:120;
  background:linear-gradient(180deg,rgba(7,11,24,.90) 0%,rgba(7,11,24,.58) 62%,rgba(7,11,24,0) 100%);
  border-bottom:1px solid transparent;
  transition:background .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.site-header::before{
  content:"";position:absolute;left:0;right:0;top:0;height:100%;
  background:
    repeating-linear-gradient(112deg,transparent 0 34px,rgba(122,92,255,.07) 34px 35px);
  opacity:.85;pointer-events:none;
}
.site-header[data-scrolled]{
  background:rgba(7,11,24,.95);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  border-bottom-color:var(--line);
  box-shadow:0 22px 46px -34px rgba(0,0,0,.98);
}
.site-header[data-scrolled]::before{opacity:.35}

.header-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(42,58,102,.45);pointer-events:none;
}
.header-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--violet),var(--cyan));
  box-shadow:0 0 12px rgba(53,230,224,.65);
  transition:width .12s linear;
}

.header-inner{
  display:flex;align-items:center;
  gap:clamp(10px,2vw,26px);
  min-height:78px;
  padding-block:12px;
}

/* Brand */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;padding:4px 2px;border-radius:var(--r-sm)}
.brand__mark{
  position:relative;flex:0 0 auto;
  width:36px;height:36px;border-radius:50%;
  display:grid;place-items:center;
  border:1px solid rgba(53,230,224,.55);
  background:radial-gradient(circle at 32% 26%,rgba(122,92,255,.5),rgba(7,11,24,.9) 72%);
  box-shadow:0 0 0 4px rgba(122,92,255,.08);
}
.brand__mark::before{
  content:"";position:absolute;inset:-3px -10px;
  border-radius:50%;
  border:1px solid rgba(122,92,255,.55);
  transform:rotate(-20deg);
  transition:transform .5s var(--ease),border-color .3s;
}
.brand:hover .brand__mark::before{transform:rotate(16deg);border-color:rgba(53,230,224,.7)}
.brand__core{
  width:9px;height:9px;border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 12px 2px rgba(53,230,224,.8);
}
.brand__text{display:flex;flex-direction:column;line-height:1.18;min-width:0}
.brand__name{font-weight:900;font-size:1.12rem;letter-spacing:.03em;white-space:nowrap}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.64rem;letter-spacing:.16em;
  color:var(--ink-dim);text-transform:uppercase;white-space:nowrap;
}

/* Version meta */
.header-meta{display:flex;align-items:center;gap:9px;min-width:0}
.header-meta__badge{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;
  padding:3px 9px;border-radius:var(--r-pill);
  color:var(--cyan);
  border:1px solid rgba(53,230,224,.42);
  background:rgba(53,230,224,.08);
}
.header-meta__text{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;
  color:var(--ink-dim);white-space:nowrap;
}

/* Nav */
.site-nav{display:flex;align-items:center;margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__item{min-width:0}
.site-nav__link{
  position:relative;isolation:isolate;
  display:inline-flex;align-items:center;gap:6px;
  padding:9px 13px;border-radius:11px;
  font-size:.94rem;font-weight:700;
  color:var(--ink-dim);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.site-nav__link::before{
  content:"";position:absolute;inset:0;z-index:0;
  border-radius:11px;
  background:linear-gradient(118deg,rgba(122,92,255,.32),rgba(53,230,224,.20));
  opacity:0;transform:skewX(-11deg);
  transition:opacity .22s var(--ease);
}
.site-nav__link > span{position:relative;z-index:1}
.site-nav__link::after{
  content:"";position:absolute;z-index:2;
  left:13px;right:13px;bottom:3px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transform:scaleX(0);transform-origin:left;
  transition:transform .26s var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--ink)}
.site-nav__link:hover::before{opacity:1}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__idx{
  font-family:var(--font-mono);font-size:.6rem;letter-spacing:.12em;
  color:var(--violet);transition:color .2s;
}
.site-nav__link:hover .site-nav__idx{color:var(--cyan)}
.site-nav__label{white-space:nowrap}
.site-nav__link[aria-current="page"]{color:var(--ink)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__foot{display:none}

/* Toggle */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  margin-left:auto;padding:9px 15px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  background:rgba(20,31,61,.82);
  color:var(--ink);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;
  transition:border-color .2s,color .2s;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:4px;width:17px}
.nav-toggle__bar{
  display:block;height:2px;width:100%;border-radius:2px;
  background:var(--cyan);
  transition:transform .24s var(--ease),opacity .2s,width .24s var(--ease);
}
.nav-toggle__bar:nth-child(2){width:68%}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);width:100%}

.header-cta{margin-left:6px;flex:0 0 auto}

/* ============ 7. Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:.92rem;font-weight:800;letter-spacing:.03em;
  transition:transform .18s var(--ease),box-shadow .2s var(--ease),background .2s,border-color .2s,color .2s;
}
.btn:hover{transform:translateY(-2px)}
.btn--solid{
  background:linear-gradient(102deg,var(--cyan),#7BF3EE);
  color:#04121A;
  box-shadow:0 14px 30px -18px rgba(53,230,224,.95);
}
.btn--solid:hover{box-shadow:0 20px 36px -18px rgba(53,230,224,1)}
.btn--ghost{
  background:rgba(20,31,61,.72);
  border-color:var(--line);
  color:var(--ink);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--quiet{background:transparent;border-color:var(--line);color:var(--ink-dim)}
.btn--quiet:hover{color:var(--ink);border-color:var(--violet)}
.btn--small{padding:9px 17px;font-size:.84rem}
.btn--block{width:100%}

/* ============ 8. Footer ============ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  background:linear-gradient(180deg,var(--space-1) 0%,var(--space-2) 42%,var(--space-0) 100%);
  border-top:1px solid var(--line);
  color:var(--ink-dim);
}
.footer-track{
  position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(122,92,255,.75),rgba(53,230,224,.85),transparent);
  box-shadow:0 0 18px rgba(53,230,224,.55);
}
.footer-inner{padding-block:clamp(38px,6vw,64px) 26px}
.footer-top{
  display:grid;grid-template-columns:minmax(250px,1.05fr) minmax(0,2fr);
  gap:clamp(26px,5vw,64px);
  padding-bottom:clamp(26px,4vw,42px);
  border-bottom:1px solid var(--line-soft);
}
.footer-brand__name{
  display:inline-block;
  font-size:1.32rem;font-weight:900;letter-spacing:.03em;color:var(--ink);
  transition:color .2s;
}
.footer-brand__name:hover{color:var(--cyan)}
.footer-brand__note{margin-top:14px;max-width:34ch;font-size:.94rem;line-height:1.85;color:var(--ink-dim)}
.footer-brand__ver{
  margin-top:16px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;
  color:var(--violet);text-transform:uppercase;
}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-col__title{
  font-family:var(--font-mono);font-size:.7rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);
}
.footer-links{margin-top:15px;display:grid;gap:10px}
.footer-link{
  display:inline-block;font-size:.94rem;color:var(--ink-dim);
  transition:color .18s,transform .18s var(--ease);
}
.footer-link:hover{color:var(--ink);transform:translateX(3px)}
.footer-contact{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:18px 28px;
  padding-block:clamp(24px,3.4vw,34px);
  border-bottom:1px solid var(--line-soft);
}
.footer-contact__item{display:grid;gap:4px;min-width:0}
.footer-contact__item--wide{grid-column:span 2}
.footer-contact__label{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--violet);
}
.footer-contact__value{font-size:.96rem;color:var(--ink);overflow-wrap:anywhere}
.footer-contact__note{
  grid-column:1/-1;font-size:.82rem;line-height:1.7;color:var(--ink-dim);
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 26px;padding-top:22px;
  font-size:.82rem;color:var(--ink-dim);
}
.footer-copy{font-size:.82rem}
.footer-icp{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--ink-dim)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal__link{
  font-size:.82rem;color:var(--ink-dim);
  border-bottom:1px solid transparent;transition:color .18s,border-color .18s;
}
.footer-legal__link:hover{color:var(--cyan);border-bottom-color:rgba(53,230,224,.6)}

/* ============ 9. 通用组件 ============ */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{
  content:"";width:24px;height:1px;
  background:currentColor;box-shadow:0 0 10px currentColor;
}
.section-head{display:grid;gap:12px;max-width:60ch}
.section-head__title{font-weight:900}
.section-head__note{font-size:.98rem;color:var(--ink-dim);line-height:1.85}

.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border-radius:var(--r-md);
  background:linear-gradient(158deg,rgba(20,31,61,.94),rgba(14,23,48,.94));
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-panel);
  transition:border-color .2s,transform .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{
  border-color:rgba(53,230,224,.45);
  transform:translateY(-3px);
  box-shadow:0 28px 52px -34px rgba(53,230,224,.55);
}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:var(--r-pill);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;
  color:var(--ink-dim);
  background:rgba(20,31,61,.85);
  border:1px solid var(--line);
}
.chip--cyan{color:var(--cyan);border-color:rgba(53,230,224,.45);background:rgba(53,230,224,.1)}
.chip--gold{color:var(--gold);border-color:rgba(245,185,76,.5);background:rgba(245,185,76,.1)}
.chip--red{color:var(--red);border-color:rgba(255,90,95,.5);background:rgba(255,90,95,.1)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--ink-dim);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--ink-dim);transition:color .18s}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

.prose{max-width:68ch;font-size:1.02rem;line-height:1.9;color:var(--ink-dim)}
.prose > * + *{margin-top:1.1em}
.prose h2,.prose h3{color:var(--ink);margin-top:1.7em}
.prose strong{color:var(--ink)}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.prose ul,.prose ol{display:grid;gap:.55em}
.prose li{position:relative;padding-left:1.35em}
.prose li::before{
  content:"";position:absolute;left:0;top:.82em;
  width:6px;height:6px;border-radius:50%;
  background:var(--violet);box-shadow:0 0 8px rgba(122,92,255,.8);
}

.media{
  position:relative;overflow:hidden;
  border-radius:var(--r-md);
  border:1px solid var(--line-soft);
  background:linear-gradient(150deg,var(--panel),var(--space-0));
  aspect-ratio:16/9;
  isolate:isolate;
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:4/5}
.media--empty{
  background-image:
    radial-gradient(360px 220px at 26% 22%,rgba(122,92,255,.34),transparent 70%),
    radial-gradient(300px 200px at 78% 74%,rgba(53,230,224,.24),transparent 72%),
    linear-gradient(150deg,var(--panel),var(--space-0));
}
.media--empty::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(115deg,transparent 0 26px,rgba(42,58,102,.35) 26px 27px);
  opacity:.5;pointer-events:none;
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:14px 18px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--ink);
  background:linear-gradient(0deg,rgba(3,5,13,.92),transparent);
}
.media__caption:empty{display:none}

.timeline{position:relative;display:grid;gap:18px;padding-left:26px}
.timeline::before{
  content:"";position:absolute;left:7px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--violet),var(--cyan),transparent);
  box-shadow:0 0 10px rgba(53,230,224,.45);
}
.timeline__item{position:relative}
.timeline__item::before{
  content:"";position:absolute;left:-24px;top:.72em;
  width:9px;height:9px;border-radius:50%;
  background:var(--space-1);
  border:1px solid var(--cyan);
  box-shadow:0 0 10px rgba(53,230,224,.75);
}

/* ============ 10. Reveal ============ */
html.js-ready [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
html.js-ready [data-reveal].is-in{opacity:1;transform:none}

/* ============ 11. 响应式 ============ */
@media (max-width:1279px){
  .header-meta{display:none}
  .site-nav__link{padding:9px 11px;font-size:.9rem}
  .site-nav__link::after{left:11px;right:11px}
}
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .header-cta{display:none}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:block;
    margin-left:0;
    padding-inline:var(--gutter);
    background:rgba(7,11,24,.985);
    border-bottom:1px solid var(--line);
    box-shadow:0 34px 64px -32px rgba(0,0,0,.98);
    max-height:0;overflow:hidden;
    opacity:0;visibility:hidden;
    transform:translateY(-10px);
    transition:max-height .34s var(--ease),opacity .24s var(--ease),transform .34s var(--ease),visibility .34s;
  }
  .site-nav[data-open]{
    max-height:min(78vh,620px);
    overflow-y:auto;
    opacity:1;visibility:visible;transform:none;
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding-block:6px}
  .site-nav__item + .site-nav__item{border-top:1px solid var(--line-soft)}
  .site-nav__link{
    display:flex;padding:16px 4px;border-radius:0;font-size:1.02rem;gap:10px;
  }
  .site-nav__link::before{display:none}
  .site-nav__link::after{left:4px;right:auto;width:28px;bottom:9px}
  .site-nav__idx{font-size:.68rem;color:var(--cyan)}
  .site-nav__foot{display:block;padding:14px 0 22px}
  .footer-top{grid-template-columns:1fr}
  .footer-contact__item--wide{grid-column:auto}
}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--sidebar{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
}
@media (max-width:600px){
  body{font-size:15.5px}
  .header-inner{min-height:68px}
  .brand__name{font-size:1rem}
  .brand__tag{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .card{border-radius:var(--r-sm)}
}

/* ============ 12. 降低动效 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html.js-ready [data-reveal]{opacity:1;transform:none}
  .btn:hover,.card:hover,.footer-link:hover{transform:none}
}