*,*::before,*::after{box-sizing:border-box}
html{color-scheme:dark;-webkit-text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit}
button{font:inherit}
img,svg{max-width:100%;display:block}

:root{
  --ink-900:#0A1A2B;
  --ink-800:#11283D;
  --ink-700:#23425C;
  --cyan:#3DF2D2;
  --cyan-deep:#0E9C84;
  --cyan-soft:#A8F7E8;
  --orange:#FF8A3D;
  --orange-deep:#C25A16;
  --orange-soft:#FFF3E8;
  --paper:#F4F7F9;
  --paper-warm:#E8EDF1;
  --grey-blue:#9DB0BE;
  --slate:#34506A;
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --radius-xl:32px;
  --radius-lg:24px;
  --radius-md:16px;
  --radius-sm:14px;
  --page-max:1440px;
  --gutter:64px;
  --grid-size:64px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

body{
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.16;
}

p{max-width:38em}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
}

.skip-link{
  position:absolute;
  left:var(--gutter);
  top:10px;
  z-index:60;
  padding:10px 20px;
  border-radius:0 0 var(--radius-sm) var(--radius-sm);
  background:var(--cyan);
  color:var(--ink-900);
  font-weight:800;
  font-size:15px;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

.container{
  width:100%;
  max-width:var(--page-max);
  margin:0 auto;
  padding-inline:var(--gutter);
}

/* ---------- 双层页头 ---------- */
.site-header{
  position:relative;
  z-index:50;
  background:
    radial-gradient(1100px 300px at 16% -40%, rgba(61,242,210,.16), transparent 70%),
    radial-gradient(700px 220px at 88% -30%, rgba(255,138,61,.14), transparent 72%),
    var(--ink-900);
  border-bottom:1px solid var(--ink-700);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(61,242,210,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,242,210,.07) 1px, transparent 1px);
  background-size:var(--grid-size) var(--grid-size);
  -webkit-mask-image:linear-gradient(to bottom, #000 10%, transparent 100%);
  mask-image:linear-gradient(to bottom, #000 10%, transparent 100%);
}
.header-top,
.header-nav{position:relative;z-index:1}

.header-top__inner{
  width:100%;
  max-width:var(--page-max);
  margin:0 auto;
  padding:20px var(--gutter);
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:16px 28px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:14px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--paper);
}
.brand__ring{
  position:relative;
  display:block;
  width:40px;
  height:40px;
  border-radius:50%;
  border:2px solid var(--cyan);
  flex:0 0 auto;
  transition:transform .18s var(--ease), border-color .18s var(--ease);
}
.brand__ring::after{
  content:"";
  position:absolute;
  inset:9px;
  border-radius:50%;
  border:1px solid var(--orange);
}
.brand:hover .brand__ring{transform:rotate(30deg);border-color:var(--cyan-soft)}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:900;
  letter-spacing:-.02em;
}
.brand__line{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--grey-blue);
}

.header-top__tagline{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--grey-blue);
  max-width:none;
}
.header-top__tagline::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:var(--cyan);
  flex:0 0 auto;
}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  flex-wrap:wrap;
}

.pill-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:9px 18px;
  border-radius:999px;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.pill-btn--cyan{
  background:var(--cyan);
  color:var(--ink-900);
  border:1px solid var(--cyan);
  box-shadow:0 0 0 1px rgba(61,242,210,.22), 0 10px 24px -14px rgba(61,242,210,.9);
}
.pill-btn--cyan:hover{background:var(--cyan-soft);border-color:var(--cyan-soft)}
.pill-btn--orange{
  background:rgba(255,138,61,.08);
  color:var(--orange);
  border:1px solid rgba(255,138,61,.62);
}
.pill-btn--orange:hover{background:var(--orange);color:var(--ink-900);border-color:var(--orange)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 18px;
  border-radius:999px;
  background:transparent;
  border:1px solid var(--ink-700);
  color:var(--paper);
  font-size:15px;
  font-weight:700;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink-900);
}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  flex:0 0 auto;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s var(--ease),top .18s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle__label{line-height:1}

.header-nav{
  background:linear-gradient(180deg, rgba(17,40,61,.94), rgba(10,26,43,.94));
  border-top:1px solid var(--ink-700);
}
.header-nav__inner{
  width:100%;
  max-width:var(--page-max);
  margin:0 auto;
  padding:10px var(--gutter);
  display:flex;
  align-items:center;
  gap:18px;
}
.header-nav__label{
  flex:0 0 auto;
  padding-right:16px;
  border-right:1px solid var(--ink-700);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--slate);
}
.nav-list{
  display:flex;
  align-items:center;
  gap:8px;
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  scrollbar-width:none;
}
.nav-list::-webkit-scrollbar{display:none}
.nav-list__item{flex:0 0 auto}
.nav-list__link{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 18px;
  border-radius:999px;
  border:1px solid transparent;
  color:var(--paper);
  font-size:15px;
  font-weight:600;
  white-space:nowrap;
  text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-list__num{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.08em;
  color:var(--grey-blue);
}
.nav-list__link:hover{
  background:rgba(61,242,210,.12);
  border-color:rgba(61,242,210,.7);
  color:var(--cyan-soft);
}
.nav-list__link:hover .nav-list__num{color:var(--cyan)}
.nav-list__link[aria-current="page"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink-900);
  box-shadow:0 10px 24px -16px rgba(61,242,210,.95);
}
.nav-list__link[aria-current="page"] .nav-list__num{color:var(--ink-700)}
.header-nav__meta{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--grey-blue);
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:80px;
  background:linear-gradient(180deg, var(--ink-900), var(--ink-800));
  border-top:1px solid var(--ink-700);
  color:var(--paper);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(157,176,190,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(157,176,190,.06) 1px, transparent 1px);
  background-size:var(--grid-size) var(--grid-size);
  -webkit-mask-image:linear-gradient(to top, #000 0%, transparent 78%);
  mask-image:linear-gradient(to top, #000 0%, transparent 78%);
}
.footer-inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--page-max);
  margin:0 auto;
  padding:56px var(--gutter) 40px;
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:48px;
  align-items:start;
}
.footer-brand__ring{
  position:relative;
  display:block;
  width:76px;
  height:76px;
  border-radius:50%;
  border:1px solid rgba(61,242,210,.5);
  margin-bottom:20px;
}
.footer-brand__ring::before{
  content:"";
  position:absolute;
  inset:12px;
  border-radius:50%;
  border:1px solid rgba(255,138,61,.55);
}
.footer-brand__ring::after{
  content:"";
  position:absolute;
  inset:30px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 22px rgba(61,242,210,.55);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:26px;
  font-weight:900;
  letter-spacing:-.02em;
  max-width:none;
}
.footer-brand__desc{
  margin-top:8px;
  font-size:14.5px;
  color:var(--grey-blue);
  max-width:24em;
}
.footer-brand__desc--mono{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--slate);
}
.footer-index{
  display:grid;
  grid-template-columns:repeat(3, minmax(0,1fr));
  gap:32px;
}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-col__list{
  display:flex;
  flex-direction:column;
  gap:9px;
}
.footer-col__link{
  display:inline-block;
  font-size:15px;
  line-height:1.5;
  color:var(--paper);
  opacity:.86;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),opacity .18s var(--ease);
}
.footer-col__link:hover{
  color:var(--cyan);
  opacity:1;
  border-bottom-color:var(--cyan);
}
.footer-meta{
  position:relative;
  z-index:1;
  border-top:1px solid var(--ink-700);
  background:rgba(10,26,43,.6);
}
.footer-meta__inner{
  width:100%;
  max-width:var(--page-max);
  margin:0 auto;
  padding:20px var(--gutter) 32px;
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 28px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--grey-blue);
}
.footer-contact{max-width:60em}
.footer-legal{color:var(--slate);white-space:nowrap}
.footer-legal [data-year]{color:var(--grey-blue)}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 26px;
  border-radius:999px;
  border:1px solid var(--ink-700);
  background:var(--ink-800);
  color:var(--paper);
  font-size:15px;
  font-weight:700;
  text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900)}
.btn--cyan:hover{background:var(--cyan-deep);border-color:var(--cyan-deep);color:#fff}
.btn--orange{background:var(--orange);border-color:var(--orange);color:var(--ink-900)}
.btn--orange:hover{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--orange-soft)}
.btn--ghost{background:transparent}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 展览标签胶囊 ---------- */
.pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:999px;
  border:1px solid var(--ink-700);
  background:rgba(52,80,106,.28);
  color:var(--grey-blue);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  white-space:nowrap;
}
.pill--cyan{background:var(--cyan-soft);border-color:transparent;color:var(--ink-900)}
.pill--orange{background:var(--orange-deep);border-color:transparent;color:var(--orange-soft)}
.pill--slate{background:var(--slate);border-color:transparent;color:var(--paper)}

.mono{
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:.04em;
  color:var(--grey-blue);
}

/* ---------- 网格与卡片 ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(12, minmax(0,1fr));
  gap:24px;
}
.card{
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  border-radius:var(--radius-lg);
  padding:28px;
  transition:transform .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--cyan);
  background:#132c42;
}
.card--list{border-radius:var(--radius-md)}

/* ---------- 编号章节 ---------- */
.section{padding-block:56px}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 14px;
  margin-bottom:28px;
}
.section__num{
  padding:5px 12px;
  border-radius:999px;
  border:1px solid rgba(255,138,61,.38);
  background:rgba(255,138,61,.12);
  color:var(--orange);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.14em;
}
.section__title{
  font-size:clamp(26px, 3.2vw, 34px);
  margin:0;
}
.section__note{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--grey-blue);
  max-width:none;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-block:18px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--grey-blue);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{
  color:var(--grey-blue);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.breadcrumb__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb__sep{color:var(--slate)}
.breadcrumb__current{color:var(--paper)}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border-radius:var(--radius-lg);
  border:1px solid var(--ink-700);
  background:
    linear-gradient(rgba(61,242,210,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61,242,210,.08) 1px, transparent 1px),
    var(--ink-800);
  background-size:32px 32px, 32px 32px, auto;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame > img,
.media-frame > svg,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame__tag{
  position:absolute;
  top:14px;
  left:14px;
  z-index:2;
  padding:5px 12px;
  border-radius:999px;
  background:rgba(10,26,43,.82);
  border:1px solid var(--ink-700);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
}
.media-frame__caption{
  display:block;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--grey-blue);
}

/* ---------- 显现动效协议 ---------- */
[data-reveal]{transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal-ready] [data-reveal]{opacity:0;transform:translateY(12px)}
[data-reveal-ready] [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  :root{--gutter:32px}
  .grid{grid-template-columns:repeat(8, minmax(0,1fr))}
  .footer-inner{grid-template-columns:1fr;gap:36px}
  .footer-index{grid-template-columns:repeat(3, minmax(0,1fr))}
}

/* ---------- 移动 ---------- */
@media (max-width:900px){
  :root{--gutter:20px}
  .header-top__inner{padding:14px var(--gutter);gap:12px}
  .header-top__tagline{display:none}
  .brand__ring{width:34px;height:34px}
  .brand__ring::after{inset:7px}
  .brand__name{font-size:18px}
  .nav-toggle{display:inline-flex}
  .header-nav{display:none;border-top:1px solid var(--ink-700)}
  .header-nav[data-open]{display:block}
  .header-nav__inner{
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    padding:14px var(--gutter) 18px;
  }
  .header-nav__label{
    padding:0 0 8px;
    border-right:0;
    border-bottom:1px solid var(--ink-700);
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    overflow:visible;
  }
  .nav-list__link{
    width:100%;
    justify-content:flex-start;
    padding:12px 16px;
    border-radius:var(--radius-md);
    border-color:var(--ink-700);
  }
  .header-nav__meta{
    padding-top:8px;
    border-top:1px solid var(--ink-700);
  }
  .section{padding-block:40px}
  .section__note{margin-left:0;flex-basis:100%}
  .card{padding:22px;border-radius:20px}
  .pill-btn{padding:8px 14px;font-size:13px}
  .footer-inner{padding:40px var(--gutter) 28px}
  .footer-meta__inner{padding:18px var(--gutter) 28px;flex-direction:column;align-items:flex-start}
  .footer-legal{white-space:normal}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.7}
  .grid{grid-template-columns:repeat(4, minmax(0,1fr));gap:16px}
  .footer-index{grid-template-columns:1fr;gap:26px}
  .site-footer{margin-top:56px}
  .footer-brand__ring{width:60px;height:60px;margin-bottom:16px}
  .footer-brand__ring::after{inset:24px}
}

@media (min-width:901px){
  .nav-list[data-edge="start"]{
    -webkit-mask-image:linear-gradient(to right, #000 82%, transparent 100%);
    mask-image:linear-gradient(to right, #000 82%, transparent 100%);
  }
  .nav-list[data-edge="middle"]{
    -webkit-mask-image:linear-gradient(to right, transparent 0, #000 6%, #000 88%, transparent 100%);
    mask-image:linear-gradient(to right, transparent 0, #000 6%, #000 88%, transparent 100%);
  }
  .nav-list[data-edge="end"]{
    -webkit-mask-image:linear-gradient(to right, transparent 0, #000 14%);
    mask-image:linear-gradient(to right, transparent 0, #000 14%);
  }
}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal],
  [data-reveal-ready] [data-reveal]{opacity:1;transform:none;transition:none}
  .card:hover,.btn:hover,.brand:hover .brand__ring{transform:none}
  .skip-link{transition:none}
}