/* ============================================================
   米兰赛场 / site.css  —— 夜战档案画册共享样式
   ============================================================ */

:root{
  --black:#0A0A0A;
  --carbon:#141414;
  --graphite:#1F1F1F;
  --line:#3A3A3A;
  --red:#FB090B;
  --red-deep:#8C0506;
  --fluoro:#C7F464;
  --bone:#F4F1EC;
  --mist:#A8A29B;
  --glass:rgba(244,241,236,.08);
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Roboto Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --gutter:6vw;
  --gap:16px;
  --pad-card:22px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd,address{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:104px;
  background:var(--black);
}

body{
  background:var(--black);
  color:var(--bone);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.1;font-stretch:95%}
h1{font-size:clamp(40px,6vw,88px)}
h2{font-size:clamp(28px,4vw,48px)}
h3{font-size:clamp(20px,2.2vw,24px)}
p{line-height:1.75}

strong,b{font-weight:800}
code,kbd,samp{font-family:var(--font-mono)}

:focus-visible{outline:2px solid var(--fluoro);outline-offset:2px;border-radius:2px}

::selection{background:var(--red);color:var(--bone)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-72px;
  z-index:200;
  padding:10px 16px;
  background:var(--fluoro);
  color:var(--black);
  font-family:var(--font-sans);
  font-size:14px;
  font-weight:800;
  letter-spacing:.04em;
  border-radius:2px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:16px}

/* ---------- 阅读进度 ---------- */
.read-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:1px;
  z-index:120;
  background:rgba(58,58,58,.45);
  pointer-events:none;
}
.read-progress__bar{
  display:block;
  width:100%;
  height:100%;
  background:var(--fluoro);
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
}

/* ---------- 页头 ---------- */
.site-header{
  --header-h:88px;
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  color:var(--bone);
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .24s var(--ease),border-color .24s var(--ease),backdrop-filter .24s var(--ease);
}
.site-header[data-state="solid"]{
  --header-h:64px;
  background:rgba(10,10,10,.92);
  border-bottom-color:var(--line);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.6vw,28px);
  min-height:var(--header-h);
  width:100%;
  max-width:1600px;
  margin:0 auto;
  padding:8px var(--gutter);
  transition:min-height .24s var(--ease);
}

/* 品牌 */
.brand{
  display:flex;
  flex-direction:column;
  gap:3px;
  flex:0 0 auto;
  padding-left:12px;
  border-left:3px solid var(--red);
}
.brand__mark{
  font-size:clamp(19px,1.6vw,23px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.05;
  color:var(--bone);
}
.brand__sub{
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
  line-height:1.2;
  white-space:nowrap;
}

/* 版本号 */
.brand__version{
  flex:0 0 auto;
  padding:5px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--fluoro);
  background:rgba(199,244,100,.07);
  border:1px solid rgba(199,244,100,.35);
  border-radius:2px;
  transition:background-color .14s var(--ease),color .14s var(--ease),border-color .14s var(--ease);
}
.brand__version:hover{border-color:var(--fluoro)}
.brand__version.is-flash{background:var(--fluoro);color:var(--black);border-color:var(--fluoro)}

/* 主导航：横向时间轴 */
.site-nav{margin-left:auto;min-width:0}
.site-nav__list{
  position:relative;
  display:flex;
  align-items:flex-start;
  flex-wrap:nowrap;
}
.site-nav__list::before{
  content:"";
  position:absolute;
  left:16px;right:16px;top:9px;
  height:1px;
  background:var(--line);
}
.site-nav__item{flex:0 0 auto}
.site-nav__link{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:5px;
  padding:18px clamp(10px,1.1vw,16px) 10px;
  color:var(--mist);
  transition:color .14s var(--ease);
  white-space:nowrap;
}
.site-nav__link::before{
  content:"";
  position:absolute;
  top:6px;left:clamp(10px,1.1vw,16px);
  width:6px;height:6px;
  border-radius:50%;
  background:var(--line);
  transition:background-color .14s var(--ease),box-shadow .14s var(--ease);
}
.site-nav__idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--mist);
  transition:color .14s var(--ease);
}
.site-nav__name{
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
}
.site-nav__link:hover{color:var(--bone)}
.site-nav__link:hover::before{background:var(--red)}
.site-nav__link[aria-current="page"]{color:var(--bone)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--fluoro)}
.site-nav__link[aria-current="page"]::before{
  background:var(--fluoro);
  box-shadow:0 0 0 3px rgba(199,244,100,.16);
}

.site-header__cta{flex:0 0 auto}

/* 移动端按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:9px 13px;
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--bone);
  transition:color .14s var(--ease),border-color .14s var(--ease);
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars i{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .18s var(--ease),opacity .18s var(--ease);
}
.nav-toggle__label{
  font-size:12px;
  font-weight:800;
  letter-spacing:.14em;
}
.nav-toggle[aria-expanded="true"]{color:var(--fluoro);border-color:rgba(199,244,100,.45)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

body[data-nav-open="true"]{overflow:hidden}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(80px,10vw,140px);
  background:var(--black);
  border-top:1px solid var(--line);
  color:var(--bone);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:min(200px,30vw);
  height:3px;
  background:var(--red);
}
.site-footer__inner{
  display:grid;
  grid-template-columns:96px minmax(0,1fr);
  gap:clamp(20px,3vw,48px);
  width:100%;
  max-width:1600px;
  margin:0 auto;
  padding:clamp(40px,5vw,72px) var(--gutter) 28px;
}
.site-footer__spine{
  align-self:start;
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.3em;
  color:var(--mist);
  white-space:nowrap;
}
.site-footer__body{
  display:flex;
  flex-direction:column;
  gap:clamp(28px,4vw,48px);
  min-width:0;
}
.site-footer__top{
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(24px,3vw,40px);
  border-bottom:1px solid var(--line);
}
.site-footer__mark{
  font-size:clamp(26px,3vw,36px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.05;
}
.site-footer__summary{
  max-width:32em;
  margin-top:12px;
  font-size:14px;
  line-height:1.75;
  color:var(--mist);
}
.site-footer__meta{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--fluoro);
}
.site-footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.site-footer__coltitle{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--mist);
}
.site-footer__list{display:flex;flex-direction:column;gap:9px}
.site-footer__link{
  width:fit-content;
  font-size:14px;
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .14s var(--ease),border-color .14s var(--ease);
}
.site-footer__link:hover{color:var(--bone);border-bottom-color:var(--red)}
.site-footer__contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px 24px;
}
.site-footer__contactitem{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding-left:14px;
  border-left:1px solid var(--line);
}
.site-footer__contactlabel{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--fluoro);
}
.site-footer__contactvalue{font-size:14px;color:var(--bone);word-break:break-word}
.site-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:8px 24px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.site-footer__legal{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.site-footer__note{max-width:48em;font-size:12px;color:var(--mist)}

/* ---------- 容器与栅格 ---------- */
.shell{width:100%;max-width:1440px;margin:0 auto;padding:0 var(--gutter)}
.shell--wide{max-width:1600px}
.shell--narrow{max-width:880px}

.grid{display:grid;gap:var(--gap)}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 章节（展览画册模板） ---------- */
.chapter{
  position:relative;
  padding:clamp(64px,9vw,128px) 0;
  border-bottom:1px solid var(--line);
  scroll-margin-top:104px;
}
.chapter__head{
  display:grid;
  grid-template-columns:64px minmax(0,1fr);
  gap:clamp(14px,2vw,28px);
  align-items:start;
  margin-bottom:clamp(28px,4vw,44px);
}
.chapter__num{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.26em;
  color:var(--mist);
  transition:color .2s var(--ease);
}
.chapter.is-active .chapter__num{color:var(--fluoro)}
.chapter__title{
  font-size:clamp(32px,4.6vw,56px);
  font-weight:900;
  line-height:1.04;
  letter-spacing:-.02em;
}
.chapter__lede{
  max-width:34em;
  margin-top:12px;
  font-size:16px;
  color:var(--mist);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid var(--line);
  border-radius:3px;
  background:transparent;
  color:var(--bone);
  font-size:14px;
  font-weight:800;
  letter-spacing:.04em;
  line-height:1;
  transition:background-color .14s var(--ease),color .14s var(--ease),border-color .14s var(--ease);
}
.btn--primary{background:var(--red);border-color:var(--red);color:var(--bone)}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--bone);border-color:var(--bone);color:var(--black)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--bone);border-color:var(--bone);color:var(--black)}
.btn--small{padding:8px 14px;font-size:12px;letter-spacing:.08em}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 8px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.14em;
  line-height:1;
  color:var(--mist);
}
.tag--red{background:var(--red);border-color:var(--red);color:var(--bone)}
.tag--fluoro{background:rgba(199,244,100,.08);border-color:rgba(199,244,100,.4);color:var(--fluoro)}

/* ---------- 档案卡 ---------- */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:var(--pad-card);
  background:var(--carbon);
  border:1px solid var(--line);
  border-radius:4px;
}
.card--glass{
  background:var(--glass);
  border-color:rgba(244,241,236,.16);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.card--solid{background:var(--graphite)}
.card__label{
  position:absolute;
  top:12px;right:12px;
  padding:4px 6px;
  background:rgba(10,10,10,.6);
  border:1px solid rgba(199,244,100,.35);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.16em;
  line-height:1;
  color:var(--fluoro);
}
.card__title{
  font-size:21px;
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
  padding-right:64px;
}
.card__text{font-size:15px;color:var(--mist)}
.card__foot{
  margin-top:auto;
  padding-top:12px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}

/* ---------- 红黑分屏 ---------- */
.split{
  display:grid;
  grid-template-columns:3fr 7fr;
  background:var(--black);
  border:1px solid var(--line);
  border-radius:4px;
  overflow:hidden;
}
.split__rail{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:26px 20px;
  background:var(--red);
  color:var(--bone);
}
.split__railTitle{font-size:14px;font-weight:900;letter-spacing:.04em}
.split__railText{font-size:13px;line-height:1.7;color:rgba(244,241,236,.86)}
.split__body{
  padding:clamp(20px,2.4vw,32px);
  background:var(--graphite);
  min-width:0;
}

/* ---------- 图片容器（共享占位） ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--carbon);
  border:1px solid var(--line);
  border-radius:4px;
}
.media__frame{display:block;width:100%;height:100%}
.media__frame img,.media__frame video,.media img,.media picture{display:block;width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.media--21x9{aspect-ratio:21/9}
.media__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:10px 14px;
  font-size:12px;
  line-height:1.5;
  color:var(--bone);
  background:rgba(10,10,10,.74);
  border-top:1px solid rgba(244,241,236,.14);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}
.media__tag{position:absolute;top:12px;left:12px}

/* ---------- 数据锚点 ---------- */
.stat{display:flex;flex-direction:column;gap:6px;min-width:0}
.stat__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(48px,9vw,120px);
  font-weight:700;
  line-height:.94;
  letter-spacing:-.03em;
  color:var(--bone);
}
.stat__unit{
  display:inline-block;
  margin-left:.08em;
  font-size:.3em;
  letter-spacing:.08em;
  color:var(--mist);
  font-style:normal;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist);
}
.stat--accent .stat__value{color:var(--red)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--line)}
.breadcrumb a{border-bottom:1px solid transparent;transition:color .14s var(--ease),border-color .14s var(--ease)}
.breadcrumb a:hover{color:var(--bone);border-bottom-color:var(--red)}
.breadcrumb [aria-current="page"]{color:var(--bone)}

/* ---------- 正文容器 ---------- */
.prose{max-width:38em;font-size:16px;line-height:1.75}
.prose p{margin:0 0 1.1em}
.prose h2{margin:2em 0 .5em;font-size:clamp(24px,3vw,32px)}
.prose h3{margin:1.6em 0 .4em;font-size:clamp(19px,2.2vw,22px)}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.2em}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose li{margin:.35em 0}
.prose a{border-bottom:1px solid var(--red);transition:color .14s var(--ease)}
.prose a:hover{color:var(--fluoro)}
.prose blockquote{
  margin:1.6em 0;
  padding:12px 0 12px 20px;
  border-left:3px solid var(--red);
  color:var(--mist);
}
.prose code{
  padding:2px 5px;
  background:var(--graphite);
  border-radius:2px;
  font-size:.9em;
  color:var(--fluoro);
}
.prose hr{border:0;border-top:1px solid var(--line);margin:2em 0}

/* ---------- 画册注脚 ---------- */
.annotation{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--mist);
}
.annotation--v{writing-mode:vertical-rl}

/* ---------- 滚动显现 ---------- */
html.has-js [data-reveal]{opacity:0}
html.has-js [data-reveal].is-revealed{
  opacity:1;
  animation:reveal-in .12s var(--ease) both;
}
@keyframes reveal-in{
  from{opacity:0;transform:translateY(12px)}
  to{opacity:1;transform:translateY(0)}
}

/* ---------- 响应式 ---------- */
@media (max-width:1280px){
  .site-header__cta{display:none}
}
@media (max-width:1080px){
  .site-header__inner{gap:14px}
  .site-nav{
    position:fixed;
    top:var(--header-h);
    left:0;right:0;bottom:0;
    margin-left:0;
    padding:8px 20px 48px;
    background:rgba(10,10,10,.98);
    -webkit-backdrop-filter:blur(12px);
    backdrop-filter:blur(12px);
    border-top:1px solid var(--line);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s linear;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav__list{flex-direction:column;align-items:stretch}
  .site-nav__list::before{display:none}
  .site-nav__link{
    flex-direction:row;
    align-items:baseline;
    gap:14px;
    padding:18px 4px;
    border-bottom:1px solid var(--line);
    color:var(--bone);
  }
  .site-nav__link::before{display:none}
  .site-nav__name{font-size:clamp(20px,4.6vw,26px);font-weight:900}
  .site-nav__idx{font-size:11px}
  .nav-toggle{display:inline-flex}
  .chapter__head{grid-template-columns:46px minmax(0,1fr)}
}
@media (max-width:900px){
  .site-footer__inner{grid-template-columns:1fr;gap:20px;padding-top:40px}
  .site-footer__spine{
    writing-mode:horizontal-tb;
    letter-spacing:.24em;
    padding-bottom:12px;
    border-bottom:1px solid var(--line);
  }
  .site-footer__top{grid-template-columns:1fr}
  .site-footer__cols{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:28px}
  .split{grid-template-columns:1fr}
}
@media (max-width:760px){
  :root{--gutter:20px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .site-footer__base{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  .site-header{--header-h:64px}
  .brand__sub{display:none}
  .chapter__head{grid-template-columns:1fr;gap:10px}
  .chapter__num{writing-mode:horizontal-tb}
  .brand__version{font-size:10px;padding:4px 7px}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.has-js [data-reveal]{opacity:1}
  html.has-js [data-reveal].is-revealed{animation:none;opacity:1;transform:none}
  .read-progress__bar{transition:none}
}