*,*::before,*::after{box-sizing:border-box}

:root{
  --ink:#0A1F1A;
  --ink-deep:#06110E;
  --turf:#133028;
  --line:#1E463A;
  --line-soft:rgba(30,70,58,.5);
  --cyan:#3DF2CE;
  --orange:#FF7A2F;
  --white:#EAF7F2;
  --muted:#9DB8AF;
  --alert:#FF5A5F;
  --amber:#F2C14E;
  --shell:1180px;
  --gutter:clamp(16px,4vw,40px);
  --radius-xl:32px;
  --radius-lg:24px;
  --radius-md:16px;
  --radius-pill:999px;
  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC",serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,"SFMono-Regular",monospace;
  --font-label:"Roboto Condensed","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--white);
  background-color:var(--ink);
  background-image:
    radial-gradient(110% 60% at 12% -5%,rgba(61,242,206,.08),transparent 62%),
    radial-gradient(90% 50% at 100% 0%,rgba(255,122,47,.06),transparent 60%),
    linear-gradient(rgba(30,70,58,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,70,58,.42) 1px,transparent 1px);
  background-size:auto,auto,72px 72px,72px 72px;
  background-position:0 0,0 0,-1px -1px,-1px -1px;
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  -webkit-font-smoothing:antialiased;
}

img,svg{max-width:100%;display:block}
a{color:var(--cyan);text-decoration-thickness:1px;text-underline-offset:3px}
button{font:inherit;color:inherit}
p{margin:0 0 1.2em}
ul,ol{margin:0 0 1.2em;padding-left:1.2em}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.2;
  letter-spacing:.01em;
  margin:0 0 .5em;
}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
::selection{background:var(--cyan);color:var(--ink-deep)}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  background:var(--cyan);
  color:var(--ink-deep);
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  transform:translateY(-220%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ===== 布局骨架 ===== */
.shell{width:min(100% - (var(--gutter) * 2),var(--shell));margin-inline:auto}

.section{
  padding:clamp(44px,7vw,96px) 0;
  border-top:1px solid var(--line);
}

.chapter{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(12px,2.5vw,32px);
  align-items:start;
  margin-bottom:clamp(20px,3vw,36px);
}
.chapter__num{
  font-family:var(--font-display);
  font-size:clamp(40px,7vw,72px);
  font-weight:600;
  line-height:.9;
  color:rgba(61,242,206,.22);
  -webkit-text-stroke:1px rgba(61,242,206,.45);
  letter-spacing:0;
}
.chapter__title{
  font-family:var(--font-display);
  font-size:clamp(24px,3.2vw,34px);
  margin:0 0 6px;
}
.chapter__kicker{
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--muted);
  margin:0;
}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,3fr)}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ===== 文字工具 ===== */
.eyebrow{
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--cyan);
  margin:0 0 10px;
}
.lede{
  font-size:clamp(17px,2vw,20px);
  line-height:1.7;
  color:var(--muted);
  max-width:62ch;
}
.data-num{
  font-family:var(--font-mono);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;
}
.prose{max-width:72ch}
.prose h2{font-size:clamp(22px,2.6vw,28px);margin-top:1.6em}
.prose h3{font-size:20px;margin-top:1.4em}
.prose li{margin-bottom:.5em}
.prose strong{color:var(--white)}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 18px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  background:transparent;
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease);
}
.btn--solid{
  background:var(--orange);
  color:var(--ink-deep);
  font-weight:700;
  border-color:var(--orange);
}
.btn--solid:hover{background:#FF9257;border-color:#FF9257}
.btn--ghost{
  color:var(--white);
  border-color:var(--line);
  background:rgba(234,247,242,.03);
}
.btn--ghost:hover{color:var(--cyan);border-color:rgba(61,242,206,.6);background:rgba(61,242,206,.08)}
.btn--quiet{color:var(--cyan);padding-inline:4px;text-decoration:underline}
.btn--quiet:hover{color:var(--white)}

/* ===== 标签 ===== */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(6,17,14,.6);
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(61,242,206,.55);background:rgba(61,242,206,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,47,.55);background:rgba(255,122,47,.08)}
.tag--amber{color:#241A05;background:var(--amber);border-color:var(--amber)}
.tag--alert{color:var(--alert);border-color:rgba(255,90,95,.55);background:rgba(255,90,95,.08)}

/* ===== 容器 ===== */
.panel{
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:clamp(18px,3vw,32px);
  background:linear-gradient(180deg,rgba(19,48,40,.86),rgba(10,31,26,.92));
}
.card{
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  padding:18px 20px;
  background:rgba(19,48,40,.55);
}
.card--accent{border-color:rgba(61,242,206,.5);background:rgba(61,242,206,.06)}

/* ===== 数据件 ===== */
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(40px,8vw,96px);
  line-height:1;
  letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;
  color:var(--white);
}
.stat__label{
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.12em;
  color:var(--muted);
}

.meter{
  display:flex;
  width:100%;
  height:12px;
  border-radius:var(--radius-pill);
  overflow:hidden;
  background:rgba(30,70,58,.55);
  border:1px solid var(--line);
}
.meter__fill{
  display:block;
  width:0;
  height:100%;
  background:var(--cyan);
  transition:width .6s var(--ease);
}
.meter__fill--alt{
  display:block;
  width:0;
  height:100%;
  background:var(--orange);
  transition:width .6s var(--ease);
}

/* ===== 图片容器基础规则 ===== */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(19,48,40,.95),rgba(6,17,14,.98));
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.85) brightness(.78) contrast(1.05);
}
.media__overlay{
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(6,17,14,0) 35%,rgba(6,17,14,.85) 100%);
}
.media__caption{
  position:absolute;
  left:16px;right:16px;bottom:14px;
  margin:0;
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}
.media__data{
  position:absolute;
  top:14px;right:16px;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:20px;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--placeholder::after{
  content:attr(data-label);
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:16px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--muted);
  background-image:
    linear-gradient(rgba(30,70,58,.5) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,70,58,.5) 1px,transparent 1px);
  background-size:32px 32px;
}

/* ===== 面包屑 ===== */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin:0 0 18px;
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb__sep{color:var(--line)}

/* ===== 标签页 / 折叠 ===== */
.tabs{display:block}
.tabs__list{
  display:flex;
  gap:6px;
  padding:6px;
  margin-bottom:18px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(6,17,14,.7);
  overflow-x:auto;
  scrollbar-width:thin;
}
.tabs__btn{
  flex:0 0 auto;
  padding:8px 16px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--muted);
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.08em;
  white-space:nowrap;
  cursor:pointer;
  transition:color .24s var(--ease),border-color .24s var(--ease),background-color .24s var(--ease);
}
.tabs__btn:hover{color:var(--white)}
.tabs__btn[aria-selected="true"]{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(61,242,206,.1);
}
.tabs__panel{padding-top:4px}
.tabs__panel[hidden]{display:none}

.fold{
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  background:rgba(19,48,40,.5);
  padding:2px 18px;
  margin-bottom:12px;
}
.fold__q{
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:14px 0;
  font-family:var(--font-display);
  font-size:18px;
  cursor:pointer;
  list-style:none;
}
.fold__q::-webkit-details-marker{display:none}
.fold__q::after{content:"+";color:var(--cyan);font-family:var(--font-mono)}
.fold[open] .fold__q::after{content:"–"}
.fold__a{
  border-top:1px dashed var(--line);
  padding:14px 0 18px;
  color:var(--muted);
}

/* ===== 动效协议 ===== */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;
  height:2px;
  z-index:120;
  background:transparent;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}

/* ===== 头部 ===== */
.site-header{position:relative;z-index:60}

.header-top{
  background:var(--ink-deep);
  border-bottom:1px solid var(--line);
}
.header-top__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 24px;
  padding:14px 0;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:inherit;
  text-decoration:none;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:44px;
  height:44px;
  border:1px solid var(--cyan);
  border-radius:14px;
  background:rgba(61,242,206,.06);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-weight:700;
  font-size:15px;
  letter-spacing:.04em;
}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__name{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(17px,1.5vw,20px);
  letter-spacing:.02em;
}
.brand__tagline{
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}

.header-top__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
}
.header-stamp{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
}
.header-stamp::before{
  content:"";
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(61,242,206,.9);
}

.header-nav{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(6,17,14,.93);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.header-nav__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px;
  min-height:62px;
  padding:8px 0;
}
.header-nav__index{
  padding-right:16px;
  border-right:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--muted);
}

.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.nav-link{
  display:block;
  padding:8px 14px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  color:var(--muted);
  font-family:var(--font-label);
  font-size:14px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:color .24s var(--ease),background-color .24s var(--ease),border-color .24s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{
  color:var(--white);
  background:rgba(61,242,206,.08);
}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(61,242,206,.1);
}

.nav-pulse{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 0 auto;
  font-family:var(--font-label);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
}
.nav-pulse__dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 12px rgba(61,242,206,.85);
  animation:pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.45;transform:scale(.72)}
}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:48px;
  height:42px;
  padding:0;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(19,48,40,.6);
  color:var(--white);
  cursor:pointer;
}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;align-items:center}
.nav-toggle__bar{
  display:block;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.nav-toggle[aria-expanded="true"]{color:var(--cyan);border-color:var(--cyan)}
.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)}

/* ===== 页脚 ===== */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-deep);
  border-top:1px solid var(--line);
  padding:clamp(40px,6vw,72px) 0 26px;
}
.footer-inner{display:block}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
  padding-bottom:clamp(24px,4vw,40px);
  border-bottom:1px solid var(--line);
}
.footer-brand{display:flex;flex-direction:column;gap:8px}
.footer-brand__mark{
  margin:0;
  font-family:var(--font-display);
  font-weight:600;
  font-size:20px;
  letter-spacing:.02em;
}
.footer-brand__line{
  margin:0;
  font-family:var(--font-label);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--cyan);
}
.footer-brand__meta{
  margin:0;
  font-size:13px;
  color:var(--muted);
}

.footer-col{display:flex;flex-direction:column;gap:10px}
.footer-col__title{
  margin:0;
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}
.footer-list{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:6px}
.footer-link{
  color:var(--white);
  font-size:15px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:rgba(61,242,206,.6)}

.footer-contact{
  display:grid;
  gap:14px;
  padding:clamp(20px,3vw,32px) 0;
  border-bottom:1px solid var(--line);
}
.footer-contact__title{
  margin:0;
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}
.footer-contact__list{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:12px;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-contact__item{display:flex;flex-direction:column;gap:2px}
.footer-contact__label{
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
}
.footer-contact__value{font-size:15px;color:var(--white)}
.footer-note{
  margin:0;
  max-width:70ch;
  font-size:13px;
  color:var(--muted);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  padding-top:18px;
}
.footer-legal{
  margin:0;
  font-family:var(--font-label);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer-legal--icp{
  padding:3px 11px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
}

/* ===== 响应式 ===== */
@media (max-width:1080px){
  .header-nav__index{display:none}
  .nav-pulse{display:none}
}

@media (max-width:900px){
  .grid--split,.grid--two,.grid--three{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:880px){
  .header-top__inner{flex-direction:column;align-items:flex-start}
  .header-top__meta{width:100%}
  .header-nav__inner{padding:10px 0}
  .nav-toggle{display:inline-flex}
  .nav-list{
    display:none;
    width:100%;
    flex-direction:column;
    gap:2px;
    padding-bottom:10px;
  }
  .header-nav[data-open] .nav-list{display:flex}
  .header-nav[data-open]{
    background:rgba(6,17,14,.99);
    border-bottom-color:rgba(61,242,206,.5);
  }
  .nav-list__item{width:100%}
  .nav-link{
    padding:12px 14px;
    border-radius:14px;
    font-size:15px;
  }
  .tabs__list{border-radius:var(--radius-md)}
  .chapter{grid-template-columns:minmax(0,1fr);gap:8px}
  .chapter__num{font-size:clamp(44px,14vw,64px)}
}

@media (max-width:560px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .header-stamp{display:none}
  .btn{padding:9px 15px}
}

@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}
  .meter__fill,.meter__fill--alt{transition:none !important}
  .nav-pulse__dot{animation:none !important}
}