:root{
  --ink:#06111F;
  --ink-2:#0B1B2E;
  --ink-3:#081625;
  --cyan:#36F1E3;
  --coral:#FF7A59;
  --violet:#8D6BFF;
  --paper-white:#EAF7FF;
  --mist:#8AA3B8;
  --paper:#E8DFCF;
  --gold:#C9A66B;
  --deep:#111820;

  --line:rgba(234,247,255,.14);
  --line-strong:rgba(54,241,227,.45);
  --text-soft:rgba(234,247,255,.78);
  --text-mute:rgba(234,247,255,.62);

  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Roboto Mono",monospace;

  --shell:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius:18px;
  --radius-sm:10px;

  --step-0:clamp(15px,.94rem + .15vw,16.5px);
  --step-1:clamp(18px,1.05rem + .4vw,22px);
  --step-2:clamp(24px,1.4rem + 1.1vw,34px);
  --step-3:clamp(36px,2rem + 3.4vw,68px);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

body{
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 82% at 78% -12%,rgba(141,107,255,.20),transparent 62%),
    radial-gradient(90% 58% at 6% 0%,rgba(54,241,227,.10),transparent 58%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--paper-white);
  font-family:var(--font-body);
  font-size:var(--step-0);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
}

#main-content{display:block;position:relative;z-index:1;scroll-margin-top:96px}

/* ---------- 通用布局 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:900px}
.section{padding-block:clamp(44px,7vw,90px)}
.section--tight{padding-block:clamp(26px,4vw,52px)}
.rule{height:1px;border:0;margin:clamp(26px,4vw,48px) 0;background:linear-gradient(90deg,rgba(54,241,227,.55),rgba(141,107,255,.36),transparent)}

.grid{display:grid;gap:clamp(16px,2.2vw,26px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}

/* ---------- 排版 ---------- */
.eyebrow{display:inline-flex;align-items:center;gap:.65em;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan)}
.display-1{font-family:var(--font-display);font-weight:800;font-size:var(--step-3);line-height:.98;letter-spacing:-.035em}
.display-2{font-family:var(--font-display);font-weight:800;font-size:clamp(28px,1.6rem + 1.8vw,46px);line-height:1.06;letter-spacing:-.028em}
.h-sec{font-family:var(--font-display);font-weight:800;font-size:var(--step-2);line-height:1.22;letter-spacing:-.02em}
.lead{font-size:var(--step-1);line-height:1.72;color:var(--text-soft);max-width:66ch}
.prose{max-width:68ch;color:var(--text-soft);line-height:1.85}
.prose p + p{margin-top:1em}
.prose strong{color:var(--paper-white);font-weight:700}
.prose a{color:var(--cyan);text-decoration-thickness:1px;text-underline-offset:3px}
.prose h2,.prose h3{font-family:var(--font-display);color:var(--paper-white);margin-top:1.6em;line-height:1.25}
.prose h2{font-size:var(--step-2)}
.prose h3{font-size:var(--step-1)}
.prose ul,.prose ol{margin-top:.8em;display:grid;gap:.4em}
.prose ul li{position:relative;padding-left:1.1em}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:1px;background:var(--coral)}
.meta{display:flex;flex-wrap:wrap;gap:8px 18px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--mist)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--font-display);font-weight:700;font-size:13.5px;letter-spacing:.06em;
  padding:11px 20px;border-radius:999px;border:1px solid transparent;text-decoration:none;
  cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{
  color:#04141c;
  background:linear-gradient(118deg,var(--cyan),#7df6ea 46%,#c4fdf8);
  box-shadow:0 12px 32px -16px rgba(54,241,227,.95),inset 0 0 0 1px rgba(255,255,255,.4);
}
.btn--primary:hover{transform:translateY(-1px);box-shadow:0 18px 40px -16px rgba(54,241,227,1)}
.btn--ghost{color:var(--paper-white);border-color:rgba(234,247,255,.28);background:rgba(234,247,255,.04)}
.btn--ghost:hover{border-color:var(--line-strong);background:rgba(54,241,227,.12);color:#fff}
.btn--coral{color:#1b0906;background:linear-gradient(120deg,var(--coral),#ffa184);box-shadow:0 12px 30px -16px rgba(255,122,89,.9)}
.btn--coral:hover{transform:translateY(-1px)}

/* ---------- 标签 ---------- */
.tag{display:inline-flex;align-items:center;gap:.4em;font-size:11.5px;letter-spacing:.12em;padding:5px 11px;border-radius:999px;white-space:nowrap;border:1px solid rgba(54,241,227,.4);color:var(--cyan);background:rgba(54,241,227,.08)}
.tag--coral{border-color:rgba(255,122,89,.45);color:var(--coral);background:rgba(255,122,89,.10)}
.tag--violet{border-color:rgba(141,107,255,.5);color:#bbabff;background:rgba(141,107,255,.14)}
.tag--muted{border-color:var(--line);color:var(--mist);background:rgba(234,247,255,.04)}
.tag-list{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- 卡片 ---------- */
.card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:clamp(18px,2.4vw,28px);border-radius:var(--radius);
  border:1px solid var(--line);
  background:linear-gradient(158deg,rgba(11,27,46,.96),rgba(6,17,31,.99));
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.card:hover{transform:translateY(-3px);border-color:rgba(54,241,227,.32);box-shadow:0 28px 58px -36px rgba(54,241,227,.6)}
.card__tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--coral)}
.card__title{font-family:var(--font-display);font-weight:800;font-size:var(--step-1);line-height:1.28;letter-spacing:-.015em}
.card__text{font-size:14.5px;line-height:1.75;color:var(--text-soft)}
.card__foot{margin-top:auto;padding-top:10px;border-top:1px solid var(--line);font-size:12.5px;color:var(--text-mute)}

/* ---------- 面板 ---------- */
.panel{padding:clamp(16px,2vw,26px);border-radius:var(--radius-sm);border:1px solid var(--line);background:rgba(11,27,46,.62)}
.panel--paper{background:var(--paper);color:var(--deep);border-color:rgba(17,24,32,.14);box-shadow:0 26px 60px -34px rgba(0,0,0,.85)}
.panel--paper a{color:#0b5f5a}
.paper{background:var(--paper);color:var(--deep);border-radius:var(--radius);padding:clamp(20px,3vw,36px)}
.paper a{color:#0b5f5a}

/* ---------- 图像容器 ---------- */
.media{
  position:relative;display:block;overflow:hidden;width:100%;
  aspect-ratio:16/10;border-radius:var(--radius-sm);border:1px solid var(--line);
  background:
    radial-gradient(80% 90% at 18% 10%,rgba(141,107,255,.30),transparent 62%),
    radial-gradient(70% 80% at 88% 92%,rgba(54,241,227,.20),transparent 60%),
    linear-gradient(160deg,#0B1B2E,#06111F);
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:4/5}
.media__img{width:100%;height:100%;object-fit:cover;object-position:center}
.media__caption{margin:0;position:absolute;left:0;right:0;bottom:0;padding:14px 16px;font-size:12px;letter-spacing:.06em;color:rgba(234,247,255,.86);background:linear-gradient(180deg,transparent,rgba(6,17,31,.9))}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin-top:clamp(18px,3vw,34px)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.08em;color:var(--mist)}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(138,163,184,.55)}
.breadcrumb__item[aria-current="page"]{color:var(--paper-white)}
.breadcrumb__link{text-decoration:none;color:inherit;transition:color .18s ease}
.breadcrumb__link:hover{color:var(--cyan)}

/* ---------- 显现 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:0;z-index:90;
  transform:translateY(-150%);
  padding:10px 20px;border-radius:0 0 12px 12px;
  background:var(--cyan);color:#04141c;font-weight:700;font-size:13px;letter-spacing:.06em;text-decoration:none;
  transition:transform .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,rgba(11,27,46,.97),rgba(6,17,31,.94));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.header-glow{
  position:absolute;inset:0;overflow:hidden;pointer-events:none;
  background:
    radial-gradient(58% 130% at 16% -52%,rgba(54,241,227,.22),transparent 70%),
    radial-gradient(52% 130% at 92% -62%,rgba(141,107,255,.26),transparent 70%);
  animation:header-drift 20s ease-in-out infinite alternate;
}
@keyframes header-drift{from{transform:translate3d(-2.4%,0,0)}to{transform:translate3d(2.4%,0,0)}}
.header-shell{position:relative;z-index:1;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.header-top{display:flex;align-items:center;gap:clamp(12px,2vw,26px);padding:13px 0 11px}

.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;flex:none}
.brand__mark{
  width:42px;height:42px;display:grid;place-items:center;border-radius:13px;
  font-family:var(--font-display);font-weight:800;font-size:18px;color:#04141c;
  background:linear-gradient(140deg,var(--cyan),#8bf8ed 42%,var(--violet));
  box-shadow:0 0 0 1px rgba(54,241,227,.55),0 12px 30px -14px rgba(54,241,227,.9);
}
.brand__text{display:flex;flex-direction:column;line-height:1.18}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:17px;letter-spacing:.06em}
.brand__line{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;color:var(--mist);text-transform:uppercase}
.header-note{margin:0;font-size:12.5px;line-height:1.55;color:var(--mist);max-width:29ch;padding-left:16px;border-left:1px solid var(--line)}

.utility-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.utility-link{
  display:inline-block;padding:6px 11px;border-radius:999px;border:1px solid transparent;
  font-size:12.5px;letter-spacing:.06em;color:var(--mist);text-decoration:none;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.utility-link:hover,.utility-link:focus-visible{color:var(--paper-white);border-color:rgba(54,241,227,.36);background:rgba(54,241,227,.09)}
.header-cta{flex:none}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 15px;border-radius:999px;cursor:pointer;
  border:1px solid var(--line);background:rgba(234,247,255,.05);
  font-size:12.5px;letter-spacing:.14em;color:var(--paper-white);
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;border-radius:2px;background:currentColor;
  transition:transform .22s ease,top .22s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

.site-nav{position:relative;border-top:1px solid var(--line)}
.site-nav__list{display:flex;align-items:center;gap:clamp(2px,1.4vw,10px);overflow-x:auto;scrollbar-width:none}
.site-nav__list::-webkit-scrollbar{display:none}
.site-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:8px;white-space:nowrap;
  padding:14px clamp(10px,1.4vw,18px) 12px;
  font-size:14px;letter-spacing:.05em;color:var(--mist);text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.site-nav__link:hover{color:var(--paper-white);background:linear-gradient(180deg,rgba(54,241,227,.11),transparent)}
.site-nav__link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}
.site-nav__index{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;color:var(--coral)}
.site-nav__more{display:none}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;background:rgba(234,247,255,.08);z-index:2}
.scroll-progress__bar{
  display:block;height:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 58%,var(--coral));
  transition:transform .1s linear;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(11,27,46,.86),var(--ink) 58%);
  overflow:hidden;
}
.footer-glow{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(70% 92% at 10% 0%,rgba(141,107,255,.20),transparent 62%),
    radial-gradient(52% 84% at 90% 6%,rgba(54,241,227,.15),transparent 62%);
}
.footer-shell{position:relative;z-index:1;max-width:var(--shell);margin-inline:auto;padding:clamp(34px,5vw,64px) var(--gutter) clamp(20px,3vw,28px)}
.footer-top{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,2fr);gap:clamp(24px,4vw,56px)}
.footer-brand{display:block}
.footer-brand__mark{
  display:inline-grid;place-items:center;width:44px;height:44px;border-radius:12px;
  font-family:var(--font-display);font-weight:800;font-size:17px;color:#1a1206;
  background:linear-gradient(140deg,var(--gold),#f0dcb4 58%,var(--gold));
  box-shadow:0 0 0 1px rgba(201,166,107,.65),0 12px 26px -16px rgba(201,166,107,.9);
}
.footer-brand__name{margin-top:14px;font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:.08em}
.footer-brand__note{margin-top:6px;font-size:12.5px;line-height:1.65;color:var(--mist);max-width:26ch}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,40px)}
.footer-col{min-width:0}
.footer-col__title{font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);margin-bottom:14px}
.footer-contact{display:grid;gap:8px;font-size:13px;line-height:1.65;color:var(--text-mute)}
.footer-contact__item{overflow-wrap:anywhere}
.footer-links{display:grid;gap:9px}
.footer-link{display:inline-block;font-size:13.5px;color:var(--text-mute);text-decoration:none;transition:color .18s ease,transform .18s ease}
.footer-link:hover,.footer-link:focus-visible{color:var(--cyan);transform:translateX(3px)}
.footer-legal{
  margin-top:clamp(26px,4vw,48px);padding-top:18px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;align-items:center;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--mist);
}
.footer-legal__icp,.footer-copy{margin:0}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:1fr}
}
@media (max-width:960px){
  .header-note{display:none}
  .footer-top{grid-template-columns:1fr}
}
@media (max-width:900px){
  .utility-nav,.header-cta{display:none}
  .nav-toggle{display:inline-flex}
  .header-top{padding:10px 0}
  .site-nav{display:none;border-top:1px solid var(--line);padding-bottom:18px}
  .site-header[data-open] .site-nav{display:block}
  .site-nav__list{flex-direction:column;gap:0;overflow:visible}
  .site-nav__link{width:100%;padding:13px 2px;font-size:16px;border-bottom:1px solid var(--line)}
  .site-nav__link[aria-current="page"]{border-bottom-color:var(--cyan);background:linear-gradient(90deg,rgba(54,241,227,.12),transparent)}
  .site-nav__more{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-top:16px}
  .site-nav__cta{margin-top:4px}
  #main-content{scroll-margin-top:80px}
}
@media (max-width:700px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-legal{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  .grid--2,.grid--3{grid-template-columns:1fr}
  .brand__line{letter-spacing:.16em}
}
@media (max-width:420px){
  .footer-grid{grid-template-columns:1fr}
  .brand__mark{width:38px;height:38px;font-size:16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .header-glow{animation:none}
  .reveal{opacity:1;transform:none}
  .card:hover,.footer-link:hover{transform:none}
}