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

:root{
  --ink-900:#070B14;
  --ink-800:#0D1524;
  --ink-700:#16223A;
  --line-600:#2A3A5C;
  --signal:#37F0C2;
  --amber:#F2B441;
  --mint:#A8FFE4;
  --coral:#FF6B6B;
  --paper:#EDF1F7;
  --muted:#93A1BC;

  --edge:2px solid var(--line-600);
  --shadow-hard:8px 8px 0 var(--line-600);
  --shadow-soft:4px 4px 0 var(--line-600);
  --ease:cubic-bezier(.2,.7,.2,1);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,monospace;

  --header-pad:clamp(10px,2vw,22px);
  --radius:2px;
}

html,body{min-height:100%}
body{
  font-family:var(--font-body);
  font-size:clamp(16px,0.55vw + 14px,18px);
  line-height:1.85;
  color:var(--paper);
  background-color:var(--ink-900);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:1;
  pointer-events:none;
  background-image:repeating-linear-gradient(180deg,rgba(147,161,188,.05) 0 1px,transparent 1px 5px);
  opacity:.6;
}
main{display:block;position:relative;z-index:2}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.2;letter-spacing:.01em}
h1{font-size:clamp(2.1rem,4.4vw,4rem);line-height:1.15}
h2{font-size:clamp(1.6rem,2.6vw,2.4rem)}
h3{font-size:clamp(1.2rem,1.6vw,1.45rem);line-height:1.35}
h4{font-size:1.02rem;line-height:1.4}

:focus-visible{outline:2px solid var(--signal);outline-offset:3px}

/* ---------- 容器与节奏 ---------- */
.wrap{
  width:100%;
  max-width:1240px;
  margin-inline:auto;
  padding-inline:clamp(16px,4vw,40px);
}
.wrap--narrow{max-width:820px}
.section{padding-block:clamp(64px,9vw,140px)}
.section--tight{padding-block:clamp(40px,5vw,72px)}

.prose{max-width:34em}
.prose p{margin-block:0 1.15em}
.prose p:last-child{margin-bottom:0}
.prose ul,.prose ol{list-style:disc;padding-left:1.35em;margin-block:0 1.2em}
.prose ol{list-style:decimal}
.prose li{margin-block:0 .4em}
.prose strong{color:var(--paper);font-weight:700}
.prose a{color:var(--mint);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--signal)}

/* ---------- 标签 / 说明牌 ---------- */
.chapter-tag{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.32em;
  text-transform:uppercase;
  color:var(--signal);
  border:var(--edge);
  background:rgba(22,34,58,.65);
  padding:4px 10px;
  line-height:1.6;
}

.placard{
  position:relative;
  display:block;
  border:var(--edge);
  background:var(--ink-700);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:var(--shadow-hard);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.placard:hover,.placard:focus-within{
  transform:translate(6px,6px);
  box-shadow:2px 2px 0 var(--line-600);
  border-color:var(--signal);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  padding:12px 20px;
  border:2px solid var(--paper);
  background:var(--paper);
  color:var(--ink-900);
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.4;
  box-shadow:var(--shadow-soft);
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s,color .18s,border-color .18s;
}
.btn:hover{transform:translate(3px,3px);box-shadow:1px 1px 0 var(--line-600)}
.btn--cyan{background:var(--signal);border-color:var(--signal);color:#04120E}
.btn--amber{background:var(--amber);border-color:var(--amber);color:#1A1102}
.btn--ghost{background:transparent;border-color:var(--line-600);color:var(--paper)}
.btn--ghost:hover{background:rgba(42,58,92,.5);border-color:var(--signal);color:var(--signal)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5em;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.5em}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--line-600)}
.breadcrumb__link{color:var(--muted)}
.breadcrumb__link:hover{color:var(--mint)}
.breadcrumb__item[aria-current="page"]{color:var(--paper)}

/* ---------- 网格 ---------- */
.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))}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border:var(--edge);
  background:var(--ink-700);
  box-shadow:var(--shadow-hard);
  aspect-ratio:16/10;
}
.media img,
.media > .media__frame{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media img{
  filter:saturate(.78) contrast(1.06) brightness(.82);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    radial-gradient(circle at 1px 1px,rgba(55,240,194,.16) 1px,transparent 0);
  background-size:5px 5px;
  opacity:.5;
  mix-blend-mode:screen;
}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__tag{
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--paper);
  background:var(--ink-900);
  border-top:var(--edge);
  border-right:var(--edge);
  padding:5px 12px;
}

/* ================= HEADER ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  padding:var(--header-pad) clamp(10px,3vw,28px) 0;
  background:linear-gradient(180deg,rgba(7,11,20,.97) 0%,rgba(7,11,20,.86) 62%,rgba(7,11,20,0) 100%);
}
.skip-link{
  position:absolute;
  left:50%;
  top:0;
  transform:translate(-50%,-140%);
  z-index:200;
  padding:10px 18px;
  background:var(--signal);
  color:#04120E;
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  border:2px solid var(--ink-900);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

.progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  z-index:120;
  background:rgba(42,58,92,.55);
  pointer-events:none;
}
.progress__fill{
  display:block;
  height:100%;
  width:100%;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
}

.site-header__inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
  max-width:1240px;
  margin-inline:auto;
  padding:9px 12px 9px 12px;
  border:var(--edge);
  border-radius:999px;
  background:rgba(13,21,36,.94);
  box-shadow:var(--shadow-hard);
  transition:padding .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease),background-color .22s var(--ease);
}
.site-header[data-condensed] .site-header__inner{
  padding-block:5px;
  box-shadow:4px 4px 0 var(--line-600);
  border-color:#35486F;
}

/* 品牌印章 */
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  min-width:0;
  color:var(--paper);
  flex:0 0 auto;
}
.brand__mark{
  flex:none;
  width:36px;
  height:36px;
  display:grid;
  place-items:center;
  border:2px solid var(--signal);
  background:rgba(55,240,194,.1);
  color:var(--signal);
  font-family:var(--font-display);
  font-size:17px;
  line-height:1;
  transition:background-color .2s,color .2s;
}
.brand:hover .brand__mark{background:var(--signal);color:#04120E}
.brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand__name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.25;
  white-space:nowrap;
}
.brand__meta{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--muted);
  white-space:nowrap;
  line-height:1.3;
}

/* 导航 */
.nav{
  display:flex;
  align-items:center;
  gap:6px;
  margin-left:auto;
  min-width:0;
}
.nav__list{display:flex;align-items:center;gap:2px;min-width:0}
.nav__link{
  display:block;
  padding:7px 11px;
  font-size:13px;
  letter-spacing:.1em;
  line-height:1.5;
  color:var(--muted);
  border:2px solid transparent;
  border-radius:999px;
  white-space:nowrap;
  transition:color .18s,background-color .18s,border-color .18s;
}
.nav__link:hover{color:var(--paper);background:rgba(42,58,92,.45);border-color:var(--line-600)}
.nav__link[aria-current="page"]{
  color:#04120E;
  background:var(--signal);
  border-color:var(--signal);
  font-weight:700;
}
.nav__quick{display:flex;align-items:center;gap:6px;margin-left:8px;padding-left:10px;border-left:2px solid var(--line-600)}
.quick-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 11px;
  font-size:12px;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--paper);
  border:2px solid var(--line-600);
  border-radius:999px;
  background:rgba(22,34,58,.75);
  white-space:nowrap;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s,color .18s;
}
.quick-link::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:currentColor;
  flex:none;
}
.quick-link:hover{transform:translate(-1px,-1px);box-shadow:3px 3px 0 var(--line-600)}
.quick-link--cyan{color:var(--signal);border-color:rgba(55,240,194,.5)}
.quick-link--mint{color:var(--mint);border-color:rgba(168,255,228,.45)}
.quick-link--amber{color:var(--amber);border-color:rgba(242,180,65,.5)}

/* 移动端切换按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 12px;
  border:2px solid var(--line-600);
  border-radius:999px;
  color:var(--paper);
  background:rgba(22,34,58,.8);
  font-size:12px;
  letter-spacing:.22em;
  line-height:1;
  cursor:pointer;
  transition:border-color .18s,color .18s;
}
.nav-toggle:hover{border-color:var(--signal);color:var(--signal)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle__label{font-family:var(--font-mono)}

.site-header[data-open="true"] .nav-toggle{border-color:var(--signal);color:var(--signal)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ================= FOOTER ================= */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:clamp(64px,9vw,140px);
  background:var(--ink-800);
  border-top:var(--edge);
  box-shadow:0 -8px 0 -6px rgba(42,58,92,.65);
}
.site-footer__inner{
  max-width:1240px;
  margin-inline:auto;
  padding:clamp(40px,6vw,84px) clamp(16px,4vw,40px) clamp(22px,3vw,32px);
}
.site-footer__top{
  display:grid;
  grid-template-columns:1.5fr repeat(3,1fr);
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(28px,4vw,48px);
  border-bottom:2px dashed var(--line-600);
}
.site-footer__lead{min-width:0}
.site-footer__brand{
  display:inline-block;
  font-family:var(--font-display);
  font-size:1.5rem;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--paper);
  border-bottom:2px solid var(--signal);
  padding-bottom:2px;
}
.site-footer__brand:hover{color:var(--signal)}
.site-footer__tagline{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--signal);
}
.site-footer__text{
  margin-top:12px;
  font-size:15px;
  line-height:1.8;
  color:var(--muted);
  max-width:30em;
}
.site-footer__meta{
  margin-top:14px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--line-600);
  filter:brightness(1.6);
}
.site-footer__col{min-width:0}
.site-footer__title{
  display:flex;
  align-items:baseline;
  gap:.65em;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--paper);
}
.site-footer__index{
  color:var(--amber);
  font-size:11px;
  letter-spacing:.18em;
}
.footer-list{margin-top:16px;display:grid;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:var(--muted);
  border-bottom:1px solid transparent;
  transition:color .18s,border-color .18s;
}
.footer-link:hover{color:var(--mint);border-bottom-color:var(--mint)}
.footer-link--mono{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  word-break:break-word;
  color:var(--paper);
}
.site-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-top:20px;
}
.site-footer__legal{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
}
.site-footer__legal--muted{color:var(--line-600);filter:brightness(1.7)}

/* ================= 入场动效 ================= */
.reveal-pending{opacity:0;transform:translateY(12px);transition:opacity .24s var(--ease),transform .24s var(--ease)}
.reveal-pending.is-in{opacity:1;transform:none}

/* ================= 响应式 ================= */
@media (max-width:1080px){
  .brand__meta{display:none}
  .nav__link{padding:7px 8px;font-size:12px}
  .quick-link{padding:6px 9px;font-size:11px}
  .site-footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__lead{grid-column:1 / -1}
}

@media (max-width:1000px){
  .nav-toggle{display:inline-flex}
  .nav{
    display:none;
    position:absolute;
    left:-2px;
    right:-2px;
    top:calc(100% + 10px);
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    margin-left:0;
    padding:14px;
    background:var(--ink-800);
    border:var(--edge);
    border-radius:14px;
    box-shadow:var(--shadow-hard);
  }
  .site-header[data-open="true"] .nav{display:flex}
  .nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .nav__link{
    padding:12px 14px;
    font-size:14px;
    border-radius:2px;
    border-color:transparent;
    color:var(--paper);
  }
  .nav__link:hover{background:rgba(42,58,92,.55);border-color:var(--line-600)}
  .nav__quick{
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    margin-left:0;
    padding-left:0;
    padding-top:10px;
    border-left:0;
    border-top:2px solid var(--line-600);
  }
  .quick-link{justify-content:flex-start;padding:10px 14px;font-size:13px;border-radius:2px}
  .site-header__inner{border-radius:20px}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  body{line-height:1.8}
  .site-header{padding-inline:10px}
  .site-header__inner{padding:8px 10px}
  .brand__mark{width:32px;height:32px;font-size:15px}
  .brand__name{font-size:15px}
  .media{box-shadow:4px 4px 0 var(--line-600)}
  .placard{box-shadow:4px 4px 0 var(--line-600)}
  .site-footer__top{grid-template-columns:minmax(0,1fr);gap:28px}
  .site-footer__bottom{flex-direction:column;align-items:flex-start;gap:8px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal-pending{opacity:1;transform:none}
  .placard:hover,.placard:focus-within{transform:none}
  .btn:hover{transform:none}
  .progress__fill{transition:none}
}