:root{
  --void:#060F1F;
  --deck:#0B1B31;
  --panel:#12294A;
  --line:#1F3E63;
  --cyan:#25E6D8;
  --cyan-soft:#8CF5EC;
  --orange:#FF8A3D;
  --mist:#E9F1F8;
  --slate:#8CA0B8;
  --ink:#02080F;
  --rail-w:88px;
  --rail-w-open:212px;
  --max:1280px;
  --f-head:"HarmonyOS Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --f-body:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
}

*,*::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{max-width:100%}
button{font:inherit;color:inherit}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--cyan-soft)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
::selection{background:rgba(37,230,216,.28);color:var(--mist)}

body{
  min-height:100vh;
  padding-left:var(--rail-w);
  background-color:var(--void);
  background-image:radial-gradient(1200px 620px at 82% -12%,rgba(37,230,216,.09),transparent 62%);
  background-repeat:no-repeat;
  color:var(--mist);
  font-family:var(--f-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{font-family:var(--f-head);font-weight:700;line-height:1.15;letter-spacing:-.02em;color:var(--mist)}
p{max-width:38ch}
.num,.stat__num,.rail__idx,.coord-list__num,.step__num,.foot__meta,.rail__contact-text{font-variant-numeric:tabular-nums}

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

.skip-link{
  position:fixed;top:10px;left:50%;z-index:120;
  transform:translate(-50%,-180%);
  background:var(--cyan);color:#04121C;
  font-size:14px;font-weight:700;letter-spacing:.02em;
  padding:10px 20px;border-radius:2px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0);color:#04121C}

/* ---------- 进度线 ---------- */
.progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:100;
  background:rgba(31,62,99,.4);pointer-events:none;
}
.progress__bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-soft));
  transform:scaleX(0);transform-origin:0 50%;
}

/* ---------- 侧边轨道 ---------- */
.rail{
  position:fixed;top:0;left:0;bottom:0;z-index:90;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  background:var(--deck);
  border-right:1px solid var(--line);
  transition:width .24s var(--ease),box-shadow .24s var(--ease);
}
.rail:hover,.rail:focus-within{width:var(--rail-w-open);box-shadow:28px 0 64px -40px rgba(0,0,0,.95)}
.rail__dock{position:relative;display:flex;flex-direction:column;height:100%;min-height:0}
.rail__grid{
  position:absolute;inset:0;pointer-events:none;opacity:.45;
  background-image:repeating-linear-gradient(0deg,rgba(31,62,99,.5) 0 1px,transparent 1px 44px);
}
.rail__head{
  position:relative;display:flex;align-items:center;
  padding:20px 0 18px 26px;border-bottom:1px solid var(--line);
}
.rail__brand{display:flex;align-items:center;gap:14px;color:var(--mist);white-space:nowrap}
.rail__brand:hover{color:var(--mist)}
.rail__mark{display:flex;align-items:center;justify-content:center;width:36px;height:36px;flex:none;color:var(--cyan)}
.rail__wordmark{
  font-family:var(--f-head);font-size:14px;font-weight:700;letter-spacing:.04em;color:var(--slate);
  opacity:0;transform:translateX(-6px);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.rail:hover .rail__wordmark,.rail:focus-within .rail__wordmark{opacity:1;transform:none}
.rail__wordmark-strong{color:var(--mist);letter-spacing:.08em}

.rail__actions{display:none}

.rail__nav{position:relative;flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;padding:10px 0}
.rail__list{display:flex;flex-direction:column}
.rail__item{display:block}
.rail__link{
  position:relative;display:flex;align-items:center;gap:12px;
  height:54px;padding:0 0 0 26px;
  color:var(--slate);white-space:nowrap;
  font-size:13px;font-weight:600;letter-spacing:.04em;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.rail__link::before{
  content:"";position:absolute;left:0;top:50%;
  width:2px;height:0;background:var(--cyan);
  transform:translateY(-50%);
  transition:height .16s var(--ease);
}
.rail__link:hover{color:var(--mist);background:rgba(18,41,74,.62)}
.rail__link[aria-current="page"]{color:var(--cyan);background:rgba(37,230,216,.09)}
.rail__link[aria-current="page"]::before{height:26px}
.rail__idx{min-width:18px;font-size:11px;letter-spacing:.1em;color:rgba(140,160,184,.62);transition:color .16s var(--ease)}
.rail__link[aria-current="page"] .rail__idx{color:var(--cyan)}
.rail__label{
  opacity:0;transform:translateX(-6px);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.rail:hover .rail__label,.rail:focus-within .rail__label{opacity:1;transform:none}

.rail__foot{
  position:relative;display:flex;flex-direction:column;gap:4px;
  border-top:1px solid var(--line);padding:12px 0 16px;
}
.rail__contact{
  display:flex;align-items:center;gap:12px;
  min-height:40px;padding-left:26px;
  color:var(--slate);font-size:12px;letter-spacing:.02em;white-space:nowrap;
}
.rail__icon{display:block;width:16px;height:16px;flex:none;color:var(--cyan);opacity:.85}
.rail__contact-text{
  opacity:0;transform:translateX(-6px);overflow:hidden;text-overflow:ellipsis;max-width:160px;
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.rail:hover .rail__contact-text,.rail:focus-within .rail__contact-text{opacity:1;transform:none}

.rail__toggle{
  display:none;
  align-items:center;justify-content:center;
  width:48px;height:48px;padding:0;
  background:var(--deck);border:1px solid var(--line);border-radius:2px;
  color:var(--cyan);cursor:pointer;
}
.rail__toggle-bars{position:relative;display:block;width:18px;height:2px;background:currentColor;border-radius:2px;transition:background-color .18s var(--ease)}
.rail__toggle-bars::before,.rail__toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;border-radius:2px;
  transition:transform .2s var(--ease);
}
.rail__toggle-bars::before{top:-6px}
.rail__toggle-bars::after{top:6px}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars{background:transparent}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars::before{transform:translateY(6px) rotate(45deg)}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars::after{transform:translateY(-6px) rotate(-45deg)}
.rail__scrim{display:none}

/* ---------- 通用排版 ---------- */
.container{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:clamp(20px,4vw,32px)}
.section{padding-block:clamp(48px,7vw,96px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;
  margin-bottom:clamp(24px,3vw,36px);padding-bottom:16px;border-bottom:1px solid var(--line);
}
.section__title{font-size:clamp(24px,2.6vw,40px)}
.section__desc{max-width:38ch;font-size:15px;color:var(--slate)}
.eyebrow{
  display:inline-block;margin-bottom:10px;
  font-family:var(--f-head);font-size:12px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan);
}
.display-xl{font-family:var(--f-head);font-size:clamp(40px,7vw,96px);font-weight:800;line-height:.95;letter-spacing:-.03em}
.display{font-family:var(--f-head);font-size:clamp(30px,4vw,64px);font-weight:800;line-height:1.02;letter-spacing:-.02em}
.lede{max-width:38ch;font-size:clamp(15px,1.5vw,17px);line-height:1.75;color:var(--slate)}
.meta{font-size:12px;letter-spacing:.06em;color:var(--slate)}
.note{font-size:13px;line-height:1.8;color:var(--slate);border-left:2px solid var(--cyan);padding-left:14px;max-width:38ch}
.rule{height:1px;border:0;background:var(--line);margin-block:clamp(32px,5vw,64px)}
.link-arrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:var(--cyan)}
.link-arrow::after{content:"→";transition:transform .18s var(--ease)}
.link-arrow:hover::after{transform:translateX(4px)}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(20px,3vw,32px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 20px;border:1px solid var(--line);border-radius:2px;
  background:transparent;color:var(--mist);
  font-family:var(--f-head);font-size:14px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{color:var(--mist);border-color:var(--cyan)}
.btn--accent{background:var(--orange);border-color:var(--orange);color:#170A02}
.btn--accent:hover{background:#FFA05F;border-color:#FFA05F;color:#170A02;box-shadow:0 14px 30px -22px rgba(255,138,61,.95)}
.btn--ghost{background:transparent;color:var(--mist)}
.btn--ghost:hover{background:rgba(37,230,216,.1)}
.btn--sm{padding:8px 14px;font-size:13px}

/* ---------- 面板与卡片 ---------- */
.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(18,41,74,.92),rgba(11,27,49,.92));
  border:1px solid var(--line);border-radius:2px;
  padding:clamp(20px,3vw,32px);
}
.card{
  position:relative;
  background:var(--deck);border:1px solid var(--line);border-radius:2px;
  padding:clamp(18px,2.4vw,26px);
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease),transform .18s var(--ease);
}
.card:hover{border-color:var(--cyan);box-shadow:0 20px 44px -34px rgba(37,230,216,.85)}

/* ---------- 标签与筛选 ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  appearance:none;padding:6px 14px;
  border:1px solid var(--line);border-radius:999px;background:transparent;
  color:var(--slate);font-size:13px;font-weight:600;line-height:1.6;cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.chip:hover{border-color:var(--cyan-soft);color:var(--mist)}
.chip.is-active,.chip[aria-pressed="true"]{background:rgba(37,230,216,.13);border-color:var(--cyan);color:var(--cyan)}
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 10px;
  border:1px solid rgba(37,230,216,.38);border-radius:2px;
  font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);
}

/* ---------- 数据锚点 ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.stat{background:var(--void);padding:18px 20px}
.stat__num{display:block;font-family:var(--f-head);font-size:clamp(26px,3vw,40px);font-weight:800;line-height:1.1;letter-spacing:-.02em;color:var(--cyan)}
.stat__label{display:block;margin-top:6px;font-size:12px;letter-spacing:.06em;color:var(--slate)}

/* ---------- 步骤线 ---------- */
.steps{display:flex;flex-direction:column}
.step{position:relative;margin-left:12px;padding:0 0 24px 40px;border-left:1px solid var(--line)}
.step:last-child{border-left-color:transparent;padding-bottom:0}
.step__num{
  position:absolute;left:-13px;top:0;
  display:flex;align-items:center;justify-content:center;
  width:25px;height:25px;
  background:var(--panel);border:1px solid var(--line);border-radius:50%;
  font-size:11px;font-weight:700;color:var(--cyan);
}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:2px;background:var(--deck)}
.data-table{width:100%;min-width:520px;border-collapse:collapse;font-size:14px}
.data-table th,.data-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
.data-table thead th{background:var(--panel);color:var(--cyan-soft);font-size:12px;font-weight:700;letter-spacing:.08em}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table td:first-child{color:var(--mist);font-weight:700}

/* ---------- 坐标索引 ---------- */
.coord-list{display:flex;flex-direction:column;border-left:1px solid var(--line)}
.coord-list__item{
  display:flex;gap:14px;
  padding:10px 0 10px 16px;
  border-bottom:1px solid rgba(31,62,99,.6);
  font-size:14px;line-height:1.7;color:var(--slate);
}
.coord-list__num{min-width:22px;padding-top:3px;font-size:11px;font-weight:700;color:var(--cyan)}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin-bottom:clamp(20px,3vw,32px)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--slate)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--line)}
.breadcrumb__link{color:var(--slate);letter-spacing:.04em}
.breadcrumb__link:hover{color:var(--cyan)}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16/10;
  border:1px solid var(--line);border-radius:2px;
  background-color:var(--deck);
  background-image:
    radial-gradient(120% 120% at 18% 0%,rgba(37,230,216,.16),transparent 62%),
    repeating-linear-gradient(115deg,rgba(31,62,99,.55) 0 1px,transparent 1px 16px);
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media__img{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover}
.media__cap{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:6px 12px;
  background:rgba(2,8,15,.82);border-top:1px solid var(--line);border-right:1px solid var(--line);
  font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan-soft);
}

/* ---------- 落位动效 ---------- */
.reveal{transition:opacity .24s var(--ease),transform .24s var(--ease)}
html.js .reveal{opacity:0;transform:translateY(16px)}
html.js .reveal.is-in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;overflow:hidden;
  margin-top:clamp(64px,8vw,96px);
  background:var(--ink);
  border-top:1px solid var(--line);
}
.foot::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:repeating-linear-gradient(90deg,rgba(31,62,99,.45) 0 1px,transparent 1px 64px);
}
.foot__grid{
  position:relative;
  display:grid;grid-template-columns:1.6fr .8fr .8fr .8fr 1.4fr;
  gap:clamp(28px,3vw,40px) clamp(20px,2.6vw,32px);
  padding-block:clamp(44px,6vw,64px) clamp(32px,4vw,48px);
}
.foot__brand{display:flex;flex-direction:column;gap:8px}
.foot__mark{display:flex;align-items:center;justify-content:center;width:36px;height:36px;color:var(--cyan)}
.foot__name{font-family:var(--f-head);font-size:18px;font-weight:800;letter-spacing:.02em;color:var(--mist);max-width:none}
.foot__tagline{font-size:13px;line-height:1.8;color:var(--slate);max-width:22ch}
.foot__col{display:flex;flex-direction:column}
.foot__title{
  margin-bottom:14px;
  font-family:var(--f-head);font-size:12px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cyan-soft);
}
.foot__links{display:flex;flex-direction:column;gap:10px}
.foot__item{display:block}
.foot__link{
  position:relative;display:inline-block;
  font-size:14px;color:var(--slate);
  transition:color .16s var(--ease),padding-left .16s var(--ease);
}
.foot__link::before{
  content:"";position:absolute;left:0;top:50%;
  width:0;height:1px;background:var(--cyan);transform:translateY(-50%);
  transition:width .16s var(--ease);
}
.foot__link:hover{color:var(--mist);padding-left:14px}
.foot__link:hover::before{width:8px}
.foot__contact{
  display:flex;flex-direction:column;gap:6px;
  padding-left:clamp(0px,2vw,24px);
  border-left:1px solid var(--line);
}
.foot__contact-line{
  max-width:none;font-size:13px;line-height:1.85;color:var(--slate);
  overflow-wrap:anywhere;
}
.foot__contact .btn{align-self:flex-start;margin-top:8px}
.foot__legal{
  position:relative;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  padding-block:18px 28px;
  border-top:1px solid var(--line);
  font-size:12px;color:var(--slate);
}
.foot__legal-line{max-width:none;letter-spacing:.04em}
.foot__meta{max-width:none;letter-spacing:.06em;color:rgba(140,160,184,.82)}

/* ---------- 平板 ---------- */
@media (max-width:1100px){
  .foot__grid{grid-template-columns:1.4fr .9fr .9fr 1.4fr}
  .foot__contact{grid-column:1 / -1;border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:20px}
}

/* ---------- 移动 ---------- */
@media (max-width:880px){
  body{padding-left:0}
  #main-content{padding-top:76px}

  .rail,.rail:hover,.rail:focus-within{
    width:100%;
    background:transparent;border-right:0;box-shadow:none;
    pointer-events:none;
  }
  .rail__dock{
    position:fixed;top:0;left:0;bottom:0;z-index:92;
    width:min(320px,86vw);
    display:flex;flex-direction:column;
    padding-bottom:16px;
    background:var(--deck);
    border-right:1px solid var(--line);
    box-shadow:32px 0 72px -40px rgba(0,0,0,.98);
    transform:translateX(-100%);
    transition:transform .24s var(--ease);
    pointer-events:auto;
    overflow-y:auto;
  }
  .rail[data-open="true"] .rail__dock{transform:none}
  .rail__toggle{
    display:flex;
    position:fixed;top:14px;right:14px;z-index:96;
    pointer-events:auto;
  }
  .rail__scrim{
    display:block;position:fixed;inset:0;z-index:88;
    background:rgba(2,8,15,.74);
    opacity:0;pointer-events:none;
    transition:opacity .2s var(--ease);
  }
  .rail[data-open="true"] .rail__scrim{opacity:1;pointer-events:auto}

  .rail__head{padding:20px}
  .rail__wordmark,.rail__label,.rail__contact-text{opacity:1;transform:none;max-width:none}
  .rail__actions{
    display:flex;gap:10px;flex-wrap:wrap;
    padding:14px 20px;border-bottom:1px solid var(--line);
  }
  .rail__nav{flex:0 1 auto;padding:8px 0 4px}
  .rail__link{height:50px;padding-left:20px}
  .rail__foot{margin-top:16px;padding:12px 0 8px}
  .rail__contact{padding-left:20px;min-height:44px;white-space:normal}
  .rail__contact-text{white-space:normal;overflow-wrap:anywhere}

  .grid--7-5,.grid--8-4{grid-template-columns:1fr}
  .foot__grid{grid-template-columns:1fr 1fr}
  .foot__brand{grid-column:1 / -1}
  .foot__contact{grid-column:1 / -1}
}
@media (max-width:560px){
  .foot__grid{grid-template-columns:1fr}
  .section__head{align-items:flex-start}
  .stats{grid-template-columns:repeat(2,1fr)}
}

/* ---------- 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.js .reveal{opacity:1;transform:none}
  .link-arrow:hover::after{transform:none}
  .foot__link:hover{padding-left:0}
}