/* ==========================================================================
   亿兆中心 · 共享样式表 /assets/site.css
   夜间运维控制台 + 印刷叠纸：深靛蓝画布、铜金细轨、信号橙动作位
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root{
  color-scheme: dark;

  --indigo-900:#0B1533;
  --indigo-700:#16244F;
  --indigo-600:#1C2C5C;
  --copper-500:#C08A3E;
  --copper-200:#E8C793;
  --orange:#FF6B35;
  --paper:#F4F1E8;
  --gray:#A8B0C2;
  --teal:#3FBFA0;
  --amber:#E0A32E;
  --white:#FFFFFF;

  --rail-w:88px;
  --topbar-h:64px;
  --shell-max:1180px;
  --gutter:1.25rem;

  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --fs-h1:clamp(2rem,5vw,3.5rem);
  --fs-h2:clamp(1.625rem,3.4vw,2.75rem);
  --fs-h3:clamp(1.25rem,1.8vw,1.625rem);
  --fs-body:clamp(1rem,1.05vw,1.0625rem);
  --fs-sm:.875rem;
  --fs-xs:.8125rem;
  --fs-mono:.75rem;

  --line:1px solid rgba(192,138,62,.32);
  --line-soft:1px solid rgba(192,138,62,.16);
  --shadow-paper:6px 6px 0 rgba(5,10,26,.55);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  background:var(--indigo-900);
  scroll-behavior:smooth;
}
body,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;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
img,svg,video{display:block;max-width:100%;height:auto;}
table{border-collapse:collapse;width:100%;}

/* ---------- 中文排版与基础文字 ---------- */
body{
  min-height:100vh;
  background:var(--indigo-900);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-sans);
  font-weight:900;
  line-height:1.12;
  letter-spacing:-.01em;
  font-stretch:condensed;
  text-wrap:balance;
}
h1{font-size:var(--fs-h1);}
h2{font-size:var(--fs-h2);}
h3{font-size:var(--fs-h3);font-weight:700;line-height:1.32;letter-spacing:0;}
small{font-size:var(--fs-xs);}
strong,b{font-weight:700;}

::selection{background:var(--copper-500);color:var(--indigo-900);}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:2px;}

/* ---------- 外壳偏移：桌面让出侧轨，移动让出顶栏 ---------- */
@media (max-width:1023px){
  body{padding-top:var(--topbar-h);}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
}

/* ---------- 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
@media (min-width:768px){:root{--gutter:2rem;}}
@media (min-width:1280px){:root{--gutter:2.5rem;}}

.grid{
  display:grid;
  gap:var(--grid-gap,1.5rem);
  grid-template-columns:minmax(0,1fr);
}
@media (min-width:900px){
  .grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr);}
  .grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}
  .grid--5-4-3{grid-template-columns:minmax(0,5fr) minmax(0,4fr) minmax(0,3fr);}
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:1200;
  padding:.55rem .95rem;
  background:var(--copper-500);
  color:var(--indigo-900);
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  font-weight:700;
  letter-spacing:.08em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s ease;
}
.skip-link:focus,
.skip-link:focus-visible{
  transform:translateY(0);
  outline-color:var(--paper);
}

/* ---------- 头部外壳 ---------- */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  height:var(--topbar-h);
  z-index:900;
  background:var(--indigo-900);
  border-bottom:var(--line);
}
.site-header::before{
  content:"";
  position:fixed;
  inset:0;
  background:rgba(5,10,26,.72);
  opacity:0;
  pointer-events:none;
  transition:opacity .25s ease;
  z-index:1;
}
.site-header[data-open]::before{opacity:1;}

/* 阅读进度条 */
.progress-bar{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  background:rgba(192,138,62,.18);
  z-index:1100;
  pointer-events:none;
}
.progress-bar__fill{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--copper-500),var(--orange));
  transition:width .12s linear;
}

/* 移动端顶栏 */
.topbar{
  position:relative;
  z-index:3;
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:var(--topbar-h);
  padding:0 1rem;
}
.topbar__brand{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  font-size:1.0625rem;
  font-weight:900;
  letter-spacing:.14em;
  color:var(--paper);
}
.topbar__brand::before{
  content:"";
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,107,53,.18);
}
.nav-toggle{
  display:inline-grid;
  place-items:center;
  width:44px;
  height:44px;
  border:1px solid rgba(192,138,62,.5);
  border-radius:2px;
  color:var(--copper-200);
  transition:border-color .25s ease,color .25s ease;
}
.nav-toggle:hover{border-color:var(--orange);color:var(--white);}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  display:block;
  width:18px;
  height:1.5px;
  background-color:currentColor;
  transition:transform .25s ease,background-color .25s ease;
}
.nav-toggle__bars{position:relative;}
.nav-toggle__bars::before,
.nav-toggle__bars::after{content:"";position:absolute;left:0;}
.nav-toggle__bars::before{top:-6px;}
.nav-toggle__bars::after{top:6px;}
.site-header[data-open] .nav-toggle__bars{background-color:transparent;}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg);}

/* ---------- 品牌轨道 / 抽屉 ---------- */
.rail{
  position:fixed;
  top:var(--topbar-h);
  left:0;
  bottom:0;
  z-index:2;
  width:min(78vw,300px);
  display:flex;
  flex-direction:column;
  padding:1.25rem 1rem 1.25rem;
  background:var(--indigo-700);
  border-right:1px solid rgba(192,138,62,.4);
  box-shadow:14px 0 40px rgba(5,10,26,.6);
  transform:translateX(-102%);
  transition:transform .32s cubic-bezier(.4,0,.2,1);
  overflow-y:auto;
}
.site-header[data-open] .rail{transform:translateX(0);}

/* 品牌区 */
.rail__brand{
  display:flex;
  align-items:center;
  gap:.75rem;
  padding-bottom:1rem;
  border-bottom:var(--line);
  flex:0 0 auto;
}
.rail__mark{
  position:relative;
  flex:0 0 auto;
  width:28px;
  height:28px;
  border:1.5px solid var(--copper-500);
  border-radius:50%;
  display:grid;
  place-items:center;
}
.rail__mark::before{
  content:"";
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 4px rgba(255,107,53,.16);
}
.rail__mark::after{
  content:"";
  position:absolute;
  inset:-5px;
  border:1px solid rgba(192,138,62,.28);
  border-radius:50%;
}
.rail__name{
  font-size:1.0625rem;
  font-weight:900;
  letter-spacing:.16em;
  color:var(--paper);
  white-space:nowrap;
}
.rail__tagline{
  flex:0 0 auto;
  margin:.9rem 0 0;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.14em;
  color:var(--copper-200);
}
.rail__nav{
  flex:1 1 auto;
  min-height:0;
  margin-top:1.1rem;
  overflow-y:auto;
  scrollbar-width:none;
}
.rail__nav::-webkit-scrollbar{display:none;}

/* 导航列表 */
.nav__list{display:flex;flex-direction:column;gap:2px;}
.nav__link{
  position:relative;
  display:flex;
  flex-direction:row;
  align-items:baseline;
  gap:.75rem;
  padding:.8rem .9rem;
  border-radius:2px;
  color:var(--gray);
  transition:color .25s ease,background-color .25s ease;
}
.nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:3px;
  height:22px;
  background:var(--copper-500);
  transform:translateY(-50%) scaleY(0);
  transform-origin:center;
  transition:transform .3s ease,background-color .3s ease;
}
.nav__num{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1;
  letter-spacing:.08em;
  color:var(--copper-500);
  transition:color .25s ease;
}
.nav__label{
  font-size:1rem;
  font-weight:700;
  line-height:1.3;
  letter-spacing:.04em;
}
.nav__link:hover{color:var(--paper);background:rgba(192,138,62,.12);}
.nav__link:hover::before{transform:translateY(-50%) scaleY(1);}
.nav__link[aria-current="page"]{color:var(--white);background:rgba(255,107,53,.14);}
.nav__link[aria-current="page"] .nav__num{color:var(--orange);}
.nav__link[aria-current="page"]::before{background:var(--orange);transform:translateY(-50%) scaleY(1);}

/* 轨道工具区：邮箱复制 */
.rail__util{
  flex:0 0 auto;
  margin-top:1rem;
  padding-top:1rem;
  border-top:var(--line);
}
.rail__mail{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.55rem .4rem;
  border:1px solid rgba(192,138,62,.5);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--copper-200);
  transition:border-color .25s ease,color .25s ease,background-color .25s ease;
}
.rail__mail:hover{
  border-color:var(--orange);
  color:var(--white);
  background:rgba(255,107,53,.12);
}
.rail__mail[data-copied="true"]{
  border-color:var(--teal);
  color:var(--teal);
  background:rgba(63,191,160,.12);
}
.rail__mail-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--teal);
  box-shadow:0 0 0 3px rgba(63,191,160,.18);
}
.rail__mail-text{white-space:nowrap;}
.rail__mail-status{
  margin-top:.4rem;
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1.5;
  letter-spacing:.06em;
  color:var(--copper-200);
  text-align:center;
  word-break:break-all;
}
.rail__mail-status:empty{display:none;}

/* ---------- 桌面端：轨道常驻左侧 88px ---------- */
@media (min-width:1024px){
  .site-header{
    top:0;
    left:0;
    bottom:0;
    right:auto;
    width:var(--rail-w);
    height:auto;
    border-bottom:0;
    border-right:1px solid rgba(192,138,62,.32);
    background:var(--indigo-900);
  }
  .site-header::before{display:none;}
  .progress-bar{left:var(--rail-w);}
  .topbar{display:none;}

  .rail{
    position:static;
    top:auto;
    bottom:auto;
    width:100%;
    height:100%;
    transform:none;
    box-shadow:none;
    border-right:0;
    background:transparent;
    padding:1.5rem .55rem 1.1rem;
    overflow:visible;
  }
  .rail__brand{
    flex-direction:column;
    gap:.55rem;
    padding:0 0 1rem;
  }
  .rail__mark{width:30px;height:30px;}
  .rail__name{
    font-size:.9375rem;
    letter-spacing:.08em;
    writing-mode:horizontal-tb;
  }
  .rail__tagline{display:none;}
  .rail__nav{margin-top:.9rem;overflow:visible;}

  .nav__link{
    flex-direction:column;
    align-items:center;
    gap:5px;
    padding:.6rem .2rem;
    text-align:center;
  }
  .nav__label{
    font-size:13px;
    letter-spacing:.02em;
    line-height:1.25;
  }
  .nav__link::before{left:-2px;height:20px;}

  .rail__util{margin-top:auto;}
  .rail__mail{flex-direction:column;gap:.35rem;padding:.5rem .2rem;font-size:10px;}
  .rail__mail-status{font-size:9px;}
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--indigo-900);
  border-top:var(--line);
  padding-block:3rem 1.5rem;
}
.footer__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:2.25rem;
  padding-bottom:2.25rem;
}
@media (min-width:640px){
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (min-width:1100px){
  .footer__inner{
    grid-template-columns:1.3fr 1fr 1.3fr .9fr;
    gap:2rem 2.5rem;
  }
}
.footer__col{min-width:0;}
.footer__brand{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-size:1.3125rem;
  font-weight:900;
  letter-spacing:.14em;
  color:var(--paper);
}
.footer__brand::before{
  content:"";
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 4px rgba(255,107,53,.16);
}
.footer__tagline{
  margin-top:.8rem;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.14em;
  color:var(--copper-200);
}
.footer__title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  font-weight:500;
  letter-spacing:.18em;
  color:var(--copper-500);
}
.footer__navlist li + li{margin-top:.5rem;}
.footer__link{
  display:inline-block;
  font-size:var(--fs-sm);
  color:var(--gray);
  transition:color .25s ease;
}
.footer__link::after{
  content:"";
  display:block;
  width:0;
  height:1px;
  background:var(--copper-500);
  transition:width .28s ease;
}
.footer__link:hover{color:var(--copper-200);}
.footer__link:hover::after{width:1.5rem;}
.footer__line{
  font-family:var(--font-mono);
  font-size:var(--fs-sm);
  letter-spacing:.03em;
  line-height:1.7;
  color:var(--gray);
  word-break:break-word;
}
.footer__line + .footer__line{margin-top:.55rem;}
.footer__line--addr{
  font-family:var(--font-sans);
  font-size:var(--fs-xs);
  letter-spacing:.01em;
  line-height:1.75;
  color:var(--copper-200);
}
.footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.5rem;
  padding-top:1.25rem;
  border-top:var(--line-soft);
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.06em;
  color:var(--gray);
}
.footer__icp,
.footer__hours,
.footer__copy{margin:0;}
.footer__hours{color:var(--copper-200);}

/* ---------- 通用：按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.75rem 1.25rem;
  border:1px solid var(--copper-500);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:var(--fs-xs);
  letter-spacing:.08em;
  color:var(--copper-200);
  background:transparent;
  transition:border-color .28s ease,color .28s ease,background-color .28s ease;
}
.btn:hover{
  border-color:var(--orange);
  color:var(--white);
  background:rgba(255,107,53,.12);
}
.btn--solid{
  background:var(--copper-500);
  border-color:var(--copper-500);
  color:var(--indigo-900);
  font-weight:700;
}
.btn--solid:hover{
  background:var(--orange);
  border-color:var(--orange);
  color:var(--indigo-900);
}

/* ---------- 通用：状态胶囊 ---------- */
.pill{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.16rem .6rem;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.65;
  letter-spacing:.08em;
  white-space:nowrap;
}
.pill--fixed{color:var(--teal);background:rgba(63,191,160,.1);}
.pill--closed{color:var(--amber);background:rgba(224,163,46,.1);}
.pill--open{color:var(--orange);background:rgba(255,107,53,.12);}
@keyframes pill-in{
  0%{opacity:.5;}
  60%{opacity:1;}
  100%{opacity:1;}
}
.pill.is-inview{animation:pill-in 1.2s ease-out 1;}

/* ---------- 通用：面板与叠纸 ---------- */
.panel{
  position:relative;
  background:var(--indigo-700);
  border:1px solid rgba(192,138,62,.35);
  padding:1.5rem;
  box-shadow:var(--shadow-paper);
}
.panel--paper{
  background:var(--paper);
  color:var(--indigo-900);
  border-color:rgba(192,138,62,.55);
  box-shadow:6px 6px 0 rgba(5,10,26,.6);
}
.panel--paper .eyebrow,
.panel--paper .section-num{color:#8A5F24;}

/* ---------- 通用：图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16/10;
  background:linear-gradient(140deg,var(--indigo-700) 0%,var(--indigo-900) 78%);
  border:1px solid rgba(192,138,62,.35);
  box-shadow:var(--shadow-paper);
}
.media--wide{aspect-ratio:21/9;}
.media--tall{aspect-ratio:4/5;}
.media--square{aspect-ratio:1/1;}
.media img,
.media svg,
.media picture{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background-image:
    radial-gradient(circle at 18% 26%,rgba(192,138,62,.38) 0 2px,transparent 2px),
    radial-gradient(circle at 62% 44%,rgba(255,107,53,.34) 0 2px,transparent 2px),
    radial-gradient(circle at 84% 74%,rgba(63,191,160,.3) 0 2px,transparent 2px),
    repeating-linear-gradient(90deg,rgba(168,176,194,.055) 0 1px,transparent 1px 48px);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(11,21,51,0) 46%,rgba(11,21,51,.6) 100%);
}

/* ---------- 通用：文字模块 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.2em;
  color:var(--copper-500);
}
.eyebrow::before{
  content:"";
  width:14px;
  height:1px;
  background:currentColor;
}
.section-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(2rem,4vw,3rem);
  font-weight:500;
  line-height:1;
  letter-spacing:.02em;
  color:var(--copper-500);
  opacity:.8;
}
.lead{
  max-width:30em;
  font-size:clamp(1.0625rem,1.4vw,1.25rem);
  line-height:1.7;
  color:var(--copper-200);
}
.prose{
  max-width:34em;
  color:var(--paper);
}
.prose p + p{margin-top:1em;}
.prose h2,
.prose h3{margin-top:1.75em;margin-bottom:.6em;}
.prose ul,
.prose ol{
  margin-top:.9em;
  padding-left:1.25em;
  list-style:disc;
}
.prose ol{list-style:decimal;}
.prose li + li{margin-top:.4em;}
.prose a{
  color:var(--copper-200);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-color:rgba(192,138,62,.6);
}
.prose a:hover{color:var(--white);}
.prose strong{color:var(--white);}

/* ---------- 通用：面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.06em;
  color:var(--gray);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
}
.breadcrumb li{display:inline-flex;align-items:center;gap:.5rem;}
.breadcrumb li + li::before{
  content:"/";
  color:var(--copper-500);
}
.breadcrumb a{transition:color .25s ease;}
.breadcrumb a:hover{color:var(--copper-200);}
.breadcrumb [aria-current="page"]{color:var(--paper);}

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

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .pill.is-inview{animation:none;opacity:1;}
  .nav__link::before{transition:none;}
}