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

:root{
  --ink-deep:#07130F;
  --panel:#0C211A;
  --line:#17362B;
  --cyan:#34E5C0;
  --orange:#FF6B33;
  --text:#E8F0EC;
  --muted:#9CB0A9;
  --tick:#46605A;
  --white:#FFFFFF;
  --overlay:#04100C;
  --serif:"Noto Serif SC","Songti SC","Source Han Serif SC",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,monospace;
  --narrow:"Barlow Condensed","Roboto Condensed","Arial Narrow",sans-serif;
  --gutter:64px;
  --panel-gap:96px;
  --radius:2px;
  --ease:cubic-bezier(0.2,0.7,0.2,1);
}

body{
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--ink-deep);
  background-image:linear-gradient(180deg,#07130F 0%,#081713 60%,#07130F 100%);
  min-height:100vh;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;letter-spacing:.01em;line-height:1.32}
h1{font-size:clamp(30px,4.6vw,52px)}
h2{font-size:clamp(22px,2.4vw,28px)}
h3{font-size:20px}
p{font-size:16px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

.mono{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted)}
.num{font-family:var(--narrow);font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.lede{font-size:clamp(17px,1.6vw,19px);line-height:1.75;color:var(--text);max-width:62ch}
.tag{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--cyan);border:1px solid var(--line);padding:3px 8px;border-radius:var(--radius)}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 跳转与刊头 ---------- */
.skip-link{
  position:absolute;top:0;left:50%;transform:translate(-50%,-140%);
  z-index:200;background:var(--cyan);color:#04120E;font-weight:600;
  padding:10px 20px;border-radius:0 0 var(--radius) var(--radius);
  text-decoration:none;transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

.site-header{
  --mh-pad:20px;
  position:sticky;top:0;z-index:80;
  background:rgba(7,19,15,.96);
  -webkit-backdrop-filter:blur(8px) saturate(140%);
  backdrop-filter:blur(8px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:border-color .2s var(--ease);
}
.site-header[data-collapsed="true"]{--mh-pad:10px}

.masthead{position:relative}
.masthead__inner{
  max-width:1600px;margin:0 auto;
  display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;gap:24px;
  padding:var(--mh-pad) var(--gutter);
  transition:padding .2s var(--ease);
}
.masthead__snapshot{
  grid-column:1;justify-self:start;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
  white-space:nowrap;transition:opacity .2s var(--ease);
}
.masthead__snapshot::before{
  content:"";display:inline-block;width:6px;height:6px;margin-right:8px;
  border-radius:50%;background:var(--cyan);vertical-align:middle;
  animation:breathe 2.4s ease-in-out infinite;
}
.site-header[data-collapsed="true"] .masthead__snapshot{opacity:0}

.brand{
  grid-column:2;justify-self:center;text-align:center;
  display:inline-flex;flex-direction:column;align-items:center;gap:2px;
  text-decoration:none;color:var(--text);
}
.brand__mark{
  font-family:var(--serif);font-weight:600;letter-spacing:.08em;line-height:1.1;
  font-size:clamp(22px,2.6vw,30px);
}
.brand__sub{
  display:block;font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  color:var(--muted);max-height:20px;overflow:hidden;
  transition:max-height .2s var(--ease),opacity .2s var(--ease);
}
.site-header[data-collapsed="true"] .brand__sub{max-height:0;opacity:0}

.masthead__utility{grid-column:3;justify-self:end;display:flex;gap:10px;align-items:center}
.util-link{
  display:inline-block;text-decoration:none;border:1px solid var(--line);border-radius:var(--radius);
  padding:8px 12px;font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
  white-space:nowrap;transition:color .18s var(--ease),border-color .18s var(--ease);
}
.util-link:hover{color:var(--cyan);border-color:var(--cyan)}
.util-link--strong{color:var(--cyan);border-color:rgba(52,229,192,.45)}

.nav-toggle{
  display:none;grid-column:3;justify-self:end;align-items:center;gap:10px;
  border:1px solid var(--line);border-radius:var(--radius);padding:9px 12px;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--text);cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:inline-block;width:16px;height:10px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1px;background:var(--cyan);
  transition:transform .2s var(--ease);
}
.nav-toggle__bars::before{top:1px}
.nav-toggle__bars::after{bottom:1px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

.nav{border-top:1px solid var(--line)}
.nav__list{
  counter-reset:nav;
  display:flex;justify-content:center;align-items:stretch;
  gap:clamp(18px,3.4vw,48px);
  padding:0 var(--gutter);margin:0 auto;max-width:1600px;
}
.nav__item{counter-increment:nav}
.nav__link{
  position:relative;display:inline-block;padding:12px 0;
  font-size:15px;letter-spacing:.04em;color:var(--muted);text-decoration:none;
  transition:color .18s var(--ease);
}
.nav__link::before{
  content:counter(nav,decimal-leading-zero);
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;color:var(--tick);
  margin-right:8px;vertical-align:2px;
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--cyan);
  transform:scaleX(0);transform-origin:50% 50%;transition:transform .2s var(--ease);
}
.nav__link:hover{color:var(--text)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--cyan)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.progress-rail{position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--line);overflow:hidden}
.progress-bar{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan) 55%,var(--orange) 100%);
  transition:transform .12s linear;
}

/* ---------- 容器 / 章节 / 网格 ---------- */
.wrap{width:100%;max-width:1440px;margin:0 auto;padding:0 var(--gutter)}
.wrap--narrow{max-width:1040px}
.section{padding:var(--panel-gap) 0;position:relative}
.section--ruled{border-top:1px solid var(--line)}
.section--flush{padding-top:0}

.grid{display:grid;gap:24px;grid-template-columns:repeat(12,minmax(0,1fr))}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ---------- 堆叠面板 ---------- */
.panel{
  position:relative;background:var(--panel);
  border:1px solid var(--line);border-radius:var(--radius);
}
.panel + .panel{margin-top:24px}
.panel__head{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  padding:14px 20px;border-bottom:1px solid var(--line);
}
.panel__index{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--tick);white-space:nowrap}
.panel__title{font-family:var(--serif);font-size:20px;font-weight:600;letter-spacing:.01em}
.panel__meta{
  margin-left:auto;display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--muted);
}
.panel__body{padding:24px 20px}
.panel__body + .panel__body{border-top:1px solid var(--line)}
.panel__grid{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:28px}
.panel__aside{
  border-left:1px solid var(--line);padding-left:20px;
  font-size:13px;line-height:1.8;color:var(--muted);
}
.panel__aside-title{
  display:block;font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--cyan);margin-bottom:8px;
}
.panel__foot{
  height:16px;border-top:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--tick) 0 1px,transparent 1px 22px);
  background-size:100% 5px;background-repeat:no-repeat;background-position:0 5px;
}

.dot{
  width:8px;height:8px;border-radius:50%;background:var(--cyan);flex:none;
  animation:breathe 2.4s ease-in-out infinite;
}
.dot--warn{background:var(--orange)}
@keyframes breathe{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}

/* ---------- 图片容器基础规则 ---------- */
.frame{
  position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);overflow:hidden;
}
.frame__media{
  position:relative;aspect-ratio:16/10;width:100%;
  background:linear-gradient(160deg,#0C211A 0%,#07130F 100%);
}
.frame__media--wide{aspect-ratio:21/9}
.frame__media--square{aspect-ratio:1/1}
.frame__media--tall{aspect-ratio:4/5}
.frame img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.78) contrast(1.04) brightness(.92);
}
.frame__shade{position:absolute;inset:0;background:var(--overlay);opacity:.6;pointer-events:none}
.frame__caption{
  display:flex;justify-content:space-between;gap:12px;
  padding:10px 14px;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--muted);
}
.frame--net .frame__media{
  background-image:
    repeating-linear-gradient(0deg,rgba(52,229,192,.09) 0 1px,transparent 1px 10px),
    repeating-linear-gradient(90deg,rgba(52,229,192,.09) 0 1px,transparent 1px 10px),
    linear-gradient(160deg,#0C211A 0%,#07130F 100%);
}

/* ---------- 四角刻度框景 ---------- */
.cornered{position:relative}
.cornered__ticks span{position:absolute;width:16px;height:16px;border:1px solid var(--tick);pointer-events:none}
.cornered__ticks span:nth-child(1){top:-1px;left:-1px;border-right:0;border-bottom:0}
.cornered__ticks span:nth-child(2){top:-1px;right:-1px;border-left:0;border-bottom:0}
.cornered__ticks span:nth-child(3){bottom:-1px;left:-1px;border-right:0;border-top:0}
.cornered__ticks span:nth-child(4){bottom:-1px;right:-1px;border-left:0;border-top:0}

/* ---------- 编辑部索引列表 ---------- */
.index-list{margin:0}
.index-list__item{
  display:grid;grid-template-columns:44px minmax(0,1fr) auto;
  gap:16px;align-items:baseline;
  padding:14px 0;border-bottom:1px solid var(--line);
}
.index-list__num{font-family:var(--mono);font-size:12px;color:var(--tick);letter-spacing:.06em}
.index-list__title{font-family:var(--serif);font-size:17px;font-weight:600}
.index-list__title a{text-decoration:none;transition:color .18s var(--ease)}
.index-list__title a:hover{color:var(--cyan)}
.index-list__note{font-family:var(--mono);font-size:12px;color:var(--muted)}

/* ---------- 折叠 ---------- */
.fold{border-bottom:1px solid var(--line)}
.fold__summary{
  display:flex;align-items:center;gap:12px;padding:16px 0;cursor:pointer;
  list-style:none;font-size:16px;color:var(--text);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"+";margin-left:auto;font-family:var(--mono);font-size:14px;color:var(--cyan)}
.fold[open] .fold__summary::after{content:"–"}
.fold__body{padding:0 0 18px;color:var(--muted);max-width:70ch}

/* ---------- 筛选条 ---------- */
.filter-bar{
  display:flex;flex-wrap:wrap;gap:8px;
  padding:14px 20px;border-bottom:1px solid var(--line);
}
.filter-chip{
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
  border:1px solid var(--line);border-radius:var(--radius);padding:6px 12px;cursor:pointer;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.filter-chip:hover{color:var(--cyan);border-color:var(--cyan)}
.filter-chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04120E}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;font-size:15px;line-height:1.2;text-decoration:none;cursor:pointer;
  border:1px solid var(--line);border-radius:var(--radius);
  background:transparent;color:var(--text);
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:#04120E;font-weight:600}
.btn--primary:hover{background:#5FF0D2;border-color:#5FF0D2;color:#04120E}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#1B0A03;font-weight:600}
.btn--accent:hover{background:#FF8A5C;border-color:#FF8A5C;color:#1B0A03}
.btn--ghost{color:var(--cyan);border-color:var(--cyan)}
.btn--ghost:hover{background:rgba(52,229,192,.12)}
.btn__arrow{font-family:var(--mono);font-size:12px}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
  padding:20px 0 0;
}
.crumbs a{color:var(--muted);text-decoration:none;transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--cyan)}
.crumbs li + li::before{content:"/";margin-right:8px;color:var(--tick)}

/* ---------- 章节高亮与显现 ---------- */
[data-spy]{position:relative}
[data-spy]::before{
  content:"";position:absolute;left:-1px;top:0;bottom:0;width:2px;
  background:var(--orange);opacity:0;transition:opacity .2s var(--ease);
}
[data-spy].is-current::before{opacity:1}
.spy-label{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--orange)}

[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .32s var(--ease),transform .32s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--panel);border-top:1px solid var(--line);margin-top:var(--panel-gap)}
.footer__inner{max-width:1440px;margin:0 auto;padding:56px var(--gutter) 40px}
.footer__brand{
  display:flex;align-items:baseline;flex-wrap:wrap;gap:10px 20px;
  padding-bottom:26px;margin-bottom:34px;border-bottom:1px solid var(--line);
}
.footer__wordmark{font-family:var(--serif);font-size:26px;font-weight:600;letter-spacing:.06em}
.footer__sub{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.footer__cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:36px 28px}
.footer__col-title{
  font-family:var(--mono);font-size:12px;font-weight:400;letter-spacing:.14em;
  color:var(--cyan);margin-bottom:16px;
}
.footer__links li + li{margin-top:10px}
.footer__links a{
  font-size:15px;color:var(--muted);text-decoration:none;
  transition:color .18s var(--ease);
}
.footer__links a:hover{color:var(--cyan)}
.footer__links--tight{margin-top:14px}
.footer__text{font-size:14px;line-height:1.85;color:var(--muted)}
.footer__kv{font-family:var(--mono);font-size:13px;color:var(--text);letter-spacing:.02em}
.footer__note{margin-top:10px;font-size:12.5px;line-height:1.75;color:var(--muted);opacity:.85}
.footer__bottom{
  max-width:1440px;margin:0 auto;
  padding:20px var(--gutter) 30px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 28px;
}
.footer__meta{font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--muted)}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .col-4{grid-column:span 6}
  .col-5,.col-7{grid-column:span 12}
}
@media (max-width:1100px){
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:960px){
  :root{--gutter:32px;--panel-gap:64px}
  .masthead__inner{
    grid-template-columns:auto minmax(0,1fr) auto;
    gap:16px;
  }
  .masthead__snapshot{display:none}
  .brand{grid-column:1;justify-self:start;align-items:flex-start;text-align:left}
  .masthead__utility{display:none}
  .nav-toggle{display:inline-flex;grid-column:3}
  .nav{max-height:0;overflow:hidden;transition:max-height .32s var(--ease)}
  .nav[data-open="true"]{max-height:560px}
  .nav__list{flex-direction:column;gap:0;padding:0 var(--gutter) 16px}
  .nav__item{border-bottom:1px solid var(--line)}
  .nav__link{display:flex;align-items:center;padding:14px 0;font-size:16px;width:100%}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]::before{color:var(--orange)}
  .grid{gap:20px}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
  .panel__grid{grid-template-columns:minmax(0,1fr);gap:20px}
  .panel__aside{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:14px}
  .index-list__item{grid-template-columns:36px minmax(0,1fr);gap:12px}
  .index-list__note{grid-column:2}
}
@media (max-width:640px){
  :root{--gutter:20px;--panel-gap:48px}
  .footer__cols{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer__inner{padding:40px var(--gutter) 32px}
  .panel__body{padding:20px 16px}
  .panel__head{padding:12px 16px}
  .brand__sub{letter-spacing:.1em}
  .footer__bottom{flex-direction:column;gap:8px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1;transform:none}
  [data-spy]::before{transition:none}
}