/* ============ 基础重置与变量 ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,p,ol,ul,figure,address{margin:0}
ol,ul{padding:0;list-style:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}

:root{
  --ink-900:#0A1A2B;
  --ink-800:#12293F;
  --ink-700:#2A4258;
  --amber:#E0A23C;
  --amber-soft:#F4D79A;
  --cinnabar:#CC4231;
  --cinnabar-text:#E4634F;
  --jade:#3DB49B;
  --mist:#E9EEF4;
  --stone:#9FB1C4;
  --metal:#6C7F94;
  --line:rgba(108,127,148,.40);
  --line-soft:rgba(108,127,148,.22);
  --rail-w:96px;
  --nav-h:68px;
  --nav-h-compact:56px;
  --shell-max:1440px;
  --font-head:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:var(--font-head);
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-sm:8px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-panel:0 18px 44px rgba(3,10,19,.45);
}

body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--mist);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(900px 520px at 78% -10%, rgba(224,162,60,.10), transparent 62%),
    radial-gradient(760px 480px at 4% 24%, rgba(61,180,155,.08), transparent 62%),
    radial-gradient(700px 440px at 96% 76%, rgba(204,66,49,.07), transparent 62%);
  background-repeat:no-repeat;
  overflow-x:hidden;
}
@supports (background-attachment:fixed){body{background-attachment:fixed}}

h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:700;
  font-stretch:88%;
  letter-spacing:-.01em;
  line-height:1.22;
  color:var(--mist);
}

a{color:var(--amber);text-decoration:none;transition:color .18s var(--ease),border-color .18s var(--ease)}
a:hover{color:var(--amber-soft)}

:focus-visible{outline:2px solid var(--amber-soft);outline-offset:3px;border-radius:4px}

.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.01em;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}

.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--jade)}
.dot--pulse{box-shadow:0 0 0 0 rgba(61,180,155,.55);animation:pulse 2.6s var(--ease) infinite}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(61,180,155,.55)}
  70%{box-shadow:0 0 0 9px rgba(61,180,155,0)}
  100%{box-shadow:0 0 0 0 rgba(61,180,155,0)}
}

/* ============ 容器与网格 ============ */
.shell{width:100%;max-width:var(--shell-max);margin:0 auto;padding:0 clamp(20px,5%,72px)}

.site-main{position:relative;z-index:1;display:block}

.section{padding:clamp(56px,7vw,104px) 0;position:relative}
.section__head{max-width:760px;margin-bottom:clamp(24px,3vw,40px)}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);font-size:13px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;
  color:var(--amber);margin-bottom:14px;
}
.section-title{font-size:clamp(28px,3.4vw,40px)}
.lede{font-size:clamp(16px,1.4vw,18px);color:var(--stone);margin-top:14px;max-width:62ch}

.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(16px,2vw,26px)}
.span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 12}

@media (min-width:760px){
  .span-3{grid-column:span 6}
  .span-4{grid-column:span 6}
  .span-5{grid-column:span 6}
  .span-6{grid-column:span 6}
  .span-7{grid-column:span 12}
  .span-8{grid-column:span 12}
}
@media (min-width:1080px){
  .span-3{grid-column:span 3}
  .span-4{grid-column:span 4}
  .span-5{grid-column:span 5}
  .span-6{grid-column:span 6}
  .span-7{grid-column:span 7}
  .span-8{grid-column:span 8}
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  min-height:44px;padding:11px 22px;
  border:1px solid transparent;border-radius:999px;
  font-size:15px;font-weight:600;line-height:1;
  letter-spacing:.02em;text-decoration:none;cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--amber{
  background-image:linear-gradient(135deg,var(--amber),#C4862A);
  color:#08141F;
  box-shadow:0 10px 28px rgba(224,162,60,.22);
}
.btn--amber:hover{color:#08141F;box-shadow:0 14px 34px rgba(224,162,60,.32)}
.btn--jade{background-color:rgba(61,180,155,.14);border-color:rgba(61,180,155,.55);color:#9EE6D6}
.btn--jade:hover{background-color:rgba(61,180,155,.24);color:#CBF3EA}
.btn--ghost{background-color:transparent;border-color:var(--line);color:var(--mist)}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber-soft)}

/* ============ 标签与面板 ============ */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 11px;border-radius:999px;
  font-size:13px;font-weight:600;line-height:1.6;
  border:1px solid var(--line);color:var(--stone);background-color:rgba(42,66,88,.42);
}
.chip--amber{border-color:rgba(224,162,60,.5);background-color:rgba(224,162,60,.12);color:var(--amber-soft)}
.chip--jade{border-color:rgba(61,180,155,.5);background-color:rgba(61,180,155,.12);color:#9EE6D6}
.chip--cinnabar{border-color:rgba(204,66,49,.55);background-color:rgba(204,66,49,.16);color:var(--cinnabar-text)}

.card,.panel{
  position:relative;
  background-color:rgba(18,41,63,.72);
  border:1px solid var(--line-soft);
  border-radius:var(--radius-lg);
  padding:clamp(18px,2.2vw,26px);
  transition:border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover,.panel:hover{border-color:var(--amber);box-shadow:var(--shadow-panel)}
.card::after{
  content:"";position:absolute;inset:auto 18px 0 18px;height:1px;
  background-image:linear-gradient(90deg,rgba(224,162,60,.5),rgba(224,162,60,0));
  opacity:.5;
}
.card__title{font-size:clamp(20px,2vw,23px);margin-bottom:8px}
.card__meta{font-size:14px;color:var(--stone);line-height:1.7}

.meta-list{display:grid;gap:8px;margin-top:14px}
.meta-list__item{display:flex;justify-content:space-between;gap:16px;font-size:15px;border-bottom:1px dashed var(--line-soft);padding-bottom:7px}
.meta-list__item:last-child{border-bottom:0}
.meta-list__item dt,.meta-list__key{color:var(--stone)}
.meta-list__item dd,.meta-list__val{margin:0;font-family:var(--font-mono);font-weight:500;color:var(--amber-soft)}

/* ============ 表格 ============ */
.data-table{font-size:15px;min-width:520px}
.data-table caption{text-align:left;color:var(--stone);font-size:14px;padding-bottom:10px}
.data-table th,.data-table td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line-soft)}
.data-table thead th{color:var(--amber);font-size:13px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;border-bottom-color:var(--line)}
.data-table tbody tr:nth-child(even){background-color:rgba(42,66,88,.38)}
.data-table tbody tr:hover{background-color:rgba(224,162,60,.08)}
.data-table td.mono{color:var(--amber-soft)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* ============ 时间线基础 ============ */
.timeline{display:grid;gap:0;margin-top:8px}
.timeline__item{position:relative;display:grid;grid-template-columns:26px 1fr;gap:14px;padding:0 0 26px}
.timeline__item::before{content:"";position:absolute;left:12px;top:22px;bottom:-4px;width:1px;background-color:var(--line-soft)}
.timeline__item:last-child::before{display:none}
.timeline__marker{width:13px;height:13px;margin-top:6px;border-radius:50%;background-color:var(--ink-900);border:2px solid var(--jade);justify-self:center}
.timeline__item[data-tone="formal"] .timeline__marker{border-color:var(--cinnabar)}
.timeline__item[data-tone="key"] .timeline__marker{border-color:var(--amber)}
.timeline__time{font-family:var(--font-mono);font-size:14px;color:var(--amber-soft)}

/* ============ 面包屑 ============ */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--stone);padding:18px 0}
.crumbs__item{color:var(--stone)}
.crumbs__item + .crumbs__item::before{content:"/";margin-right:8px;color:var(--metal)}
.crumbs__item a{color:var(--stone)}
.crumbs__item a:hover{color:var(--amber-soft)}
.crumbs__item[aria-current="page"]{color:var(--mist)}

/* ============ 图片容器 ============ */
.media{margin:0;display:block}
.media__frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background-color:var(--ink-800);
  background-image:linear-gradient(135deg,rgba(61,180,155,.10),rgba(224,162,60,.06) 55%,rgba(204,66,49,.08));
  aspect-ratio:16/10;
}
.media--wide .media__frame{aspect-ratio:21/9}
.media--square .media__frame{aspect-ratio:1/1}
.media--tall .media__frame{aspect-ratio:3/4}
.media__img{width:100%;height:100%;object-fit:cover;display:block}
.media__caption{margin-top:10px;font-size:13.5px;color:var(--stone);line-height:1.7}
@media (max-width:600px){.media--wide .media__frame{aspect-ratio:16/10}}

/* ============ 显现动效 ============ */
.js [data-reveal]{opacity:0;transform:translateY(8px);transition:opacity .56s var(--ease),transform .56s var(--ease)}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 跳转链接 ============ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-160%);
  padding:10px 18px;border-radius:999px;
  background-color:var(--amber);color:#08141F;
  font-size:14px;font-weight:700;line-height:1;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:none;color:#08141F}

/* ============ 头部 ============ */
.site-header{position:fixed;top:0;left:0;right:0;z-index:90}

.brand-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;gap:18px;
  padding:26px 10px 22px;
  background-image:linear-gradient(180deg,rgba(10,26,43,.96),rgba(18,41,63,.92));
  border-right:1px solid var(--line-soft);
  backdrop-filter:blur(10px);
}
.brand-rail__mark{
  writing-mode:vertical-rl;
  font-size:19px;font-weight:700;font-stretch:88%;
  letter-spacing:.16em;color:var(--mist);
}
.brand-rail__mark:hover{color:var(--amber-soft)}
.brand-rail__mark-tail{color:var(--amber)}
.brand-rail__sub{
  writing-mode:vertical-rl;font-size:12px;letter-spacing:.24em;color:var(--stone);
}
.rail-ticks{display:flex;flex-direction:column;gap:12px;margin:4px 0 auto;width:100%;align-items:center}
.rail-tick{display:flex;flex-direction:column;align-items:center;gap:5px;width:100%}
.rail-tick__num{font-family:var(--font-mono);font-size:12.5px;font-weight:500;color:var(--metal);transition:color .2s var(--ease)}
.rail-tick__line{display:block;width:16px;height:1px;background-color:var(--line);transition:width .28s var(--ease),background-color .28s var(--ease)}
.rail-tick[data-active] .rail-tick__num{color:var(--amber)}
.rail-tick[data-active] .rail-tick__line{width:34px;background-color:var(--amber)}
.brand-rail__state{display:flex;align-items:center;gap:7px;writing-mode:vertical-rl;font-size:12px;color:var(--stone);letter-spacing:.16em}
.brand-rail__state .dot{writing-mode:horizontal-tb}

.nav-band{
  position:fixed;top:0;left:var(--rail-w);right:0;
  background-image:linear-gradient(180deg,rgba(10,26,43,.78),rgba(10,26,43,0));
  transition:background-color .3s var(--ease),height .3s var(--ease),background-image .3s var(--ease),box-shadow .3s var(--ease);
}
.nav-band__inner{
  display:flex;align-items:center;gap:18px;
  height:var(--nav-h);
  padding:0 clamp(18px,4vw,54px);
  transition:height .3s var(--ease);
}
.nav-band__brand{
  font-size:19px;font-weight:700;font-stretch:88%;letter-spacing:.02em;
  color:var(--mist);display:none;
}
.nav-band__brand:hover{color:var(--amber-soft)}

.primary-nav{flex:1 1 auto}
.primary-nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px)}
.primary-nav__link{
  display:inline-block;position:relative;
  padding:8px 2px;font-size:15px;font-weight:500;color:var(--stone);
}
.primary-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:1px;height:2px;
  background-color:var(--amber);transform:scaleX(0);transform-origin:left;
  transition:transform .24s var(--ease);
}
.primary-nav__link:hover{color:var(--mist)}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--amber)}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.primary-nav__foot{display:none}
.primary-nav__hint{font-size:13px;color:var(--stone);margin-top:12px}

.nav-band__cta{flex:0 0 auto;white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:44px;min-width:44px;padding:8px 14px;
  background-color:rgba(18,41,63,.7);border:1px solid var(--line);
  border-radius:999px;cursor:pointer;font-size:14px;font-weight:600;color:var(--mist);
}
.nav-toggle__bars{position:relative;width:18px;height:2px;background-color:var(--amber);display:inline-block;transition:background-color .18s var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background-color:var(--amber);
  transition:transform .24s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[data-open] .nav-toggle__bars{background-color:transparent}
.nav-toggle[data-open] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[data-open] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

.read-progress{
  display:block;height:2px;width:100%;
  background-color:rgba(108,127,148,.18);
}
.read-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background-image:linear-gradient(90deg,var(--amber),var(--amber-soft));
}

.site-header[data-scrolled] .nav-band{
  background-image:none;
  background-color:rgba(10,26,43,.95);
  box-shadow:0 14px 34px rgba(3,10,19,.5);
  backdrop-filter:blur(12px);
}
.site-header[data-scrolled] .nav-band__inner{height:var(--nav-h-compact)}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:clamp(60px,8vw,120px);
  padding:clamp(48px,6vw,80px) 0 26px;
  border-top:1px solid var(--line-soft);
  background-image:linear-gradient(180deg,rgba(18,41,63,.55),rgba(10,26,43,1) 62%);
  color:var(--stone);
  font-size:15px;
}
.site-footer__inner{
  display:grid;gap:clamp(22px,3vw,38px);
  grid-template-columns:1fr;
  padding-bottom:clamp(28px,4vw,46px);
}
.footer-brand__mark{display:inline-block;font-size:22px;font-weight:700;font-stretch:88%;color:var(--mist);letter-spacing:.02em}
.footer-brand__mark:hover{color:var(--amber-soft)}
.footer-brand__note{margin-top:10px;line-height:1.7;max-width:34ch}
.footer-brand__meta{margin-top:10px;font-size:13.5px;color:var(--metal)}
.footer-brand__meta .mono{color:var(--amber-soft)}

.footer-index{display:grid;gap:clamp(20px,3vw,34px);grid-template-columns:1fr}
.footer-col__title{
  font-size:14px;font-weight:600;letter-spacing:.12em;
  color:var(--amber);text-transform:uppercase;margin-bottom:12px;
}
.footer-col__list{display:grid;gap:9px}
.footer-col__list a{color:var(--stone);font-size:15px;border-bottom:1px solid transparent;padding-bottom:1px}
.footer-col__list a:hover{color:var(--amber-soft);border-bottom-color:rgba(224,162,60,.45)}

.footer-contact{display:grid;gap:10px;font-style:normal}
.footer-contact__row{display:grid;gap:2px}
.footer-contact__label{font-size:12.5px;letter-spacing:.1em;color:var(--metal)}
.footer-contact__value{color:var(--mist);overflow-wrap:anywhere;line-height:1.65}
.footer-contact__value.mono{color:var(--amber-soft);font-size:14.5px}

.site-footer__base{
  display:flex;flex-wrap:wrap;gap:12px 24px;
  align-items:center;justify-content:space-between;
  padding-top:20px;border-top:1px solid var(--line-soft);
  font-size:13.5px;color:var(--metal);
}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center}
.footer-legal a{color:var(--stone)}
.footer-legal a:hover{color:var(--amber-soft)}
.footer-legal .mono{color:var(--stone)}

/* ============ 主内容让位与断点 ============ */
.site-main{padding-top:0}

@media (min-width:1025px){
  body{padding-left:var(--rail-w)}
  .nav-band__brand{display:none}
}

@media (max-width:1024px){
  body{padding-bottom:56px}
  .brand-rail{
    top:auto;right:0;bottom:0;width:auto;height:46px;
    flex-direction:row;justify-content:space-between;gap:12px;
    padding:0 16px;border-right:0;border-top:1px solid var(--line-soft);
  }
  .brand-rail__mark,.brand-rail__sub,.brand-rail__state{writing-mode:horizontal-tb}
  .brand-rail__mark,.brand-rail__sub{display:none}
  .brand-rail__state{font-size:11.5px;letter-spacing:.1em}
  .rail-ticks{flex-direction:row;gap:14px;margin:0;width:auto;justify-content:flex-end}
  .rail-tick{width:auto;flex-direction:row;align-items:center;gap:6px}
  .rail-tick__line{width:10px}
  .rail-tick[data-active] .rail-tick__line{width:22px}

  .nav-band{left:0}
  .nav-band__inner{gap:12px}
  .nav-band__brand{display:inline-block}
  .nav-band__cta{display:none}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:var(--nav-h);left:0;right:0;
    display:none;
    max-height:calc(100vh - var(--nav-h) - 46px);
    overflow-y:auto;
    padding:14px 20px 26px;
    background-image:linear-gradient(180deg,rgba(10,26,43,.99),rgba(18,41,63,.98));
    border-bottom:1px solid var(--line);
    box-shadow:0 22px 44px rgba(3,10,19,.55);
  }
  .primary-nav[data-open]{display:block}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .primary-nav__item{border-bottom:1px dashed var(--line-soft)}
  .primary-nav__link{display:block;padding:15px 2px;font-size:17px}
  .primary-nav__link::after{display:none}
  .primary-nav__link[aria-current="page"]{color:var(--amber)}
  .primary-nav__foot{display:block;margin-top:20px}
  .primary-nav__cta{width:100%}
  .nav-band__brand{font-size:17px}
}

@media (min-width:1025px){
  .primary-nav__list{justify-content:flex-end}
}

@media (min-width:760px){
  .site-footer__inner{grid-template-columns:repeat(2,1fr)}
  .footer-brand{grid-column:1/-1}
}
@media (min-width:1080px){
  .site-footer__inner{grid-template-columns:minmax(230px,1.5fr) repeat(4,minmax(150px,1fr))}
  .footer-brand{grid-column:auto}
  .footer-index{display:contents}
}

/* ============ 无障碍与降级 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}