:root{
  --ink:#0B1F1A;
  --ink-deep:#111614;
  --panel:#1C2B27;
  --paper:#F2F5F4;
  --muted:#8FA3A0;
  --yellow:#F5D000;
  --red:#E0393E;
  --teal:#63D2C4;
  --glass:rgba(242,245,244,.08);
  --glass-2:rgba(242,245,244,.14);
  --line:rgba(242,245,244,.16);
  --line-soft:rgba(242,245,244,.08);
  --ink-on-signal:#12180F;

  --font-head:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans 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,"Liberation Mono","Courier New",monospace;

  --wrap:1240px;
  --gutter:clamp(18px,4vw,48px);
  --nav-h:52px;
  --radius:2px;
  --ease:cubic-bezier(.3,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100%;
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 70% at 12% -10%,rgba(99,210,196,.10),transparent 60%),
    radial-gradient(90% 60% at 100% 0%,rgba(245,208,0,.07),transparent 55%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

img,svg,video{display:block;max-width:100%}
a{color:inherit}
button{font:inherit}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.12;
  letter-spacing:-.01em;
  color:var(--paper);
  text-wrap:balance;
}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0}
li{list-style:none}

:focus-visible{
  outline:2px solid var(--teal);
  outline-offset:3px;
}

.wrap{
  width:min(calc(100% - var(--gutter) * 2),var(--wrap));
  margin-inline:auto;
}

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

.u-mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
}

/* ---------- 跳转链 ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-72px;
  z-index:90;
  padding:10px 16px;
  background:var(--yellow);
  color:var(--ink-on-signal);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 头部 ---------- */
.site-header{position:relative;z-index:30}

.masthead-top{
  background:linear-gradient(180deg,rgba(28,43,39,.55),rgba(11,31,26,0));
  border-bottom:1px solid var(--line-soft);
}
.masthead-top__inner{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:20px 32px;
  flex-wrap:wrap;
  padding:22px 0 20px;
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
  min-width:0;
  text-decoration:none;
  color:var(--paper);
}
.brand__mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:44px;height:44px;
  border:1px solid var(--yellow);
  background:var(--glass);
  color:var(--yellow);
  font-weight:900;
  font-size:15px;
  line-height:1;
  letter-spacing:.02em;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.brand:hover .brand__mark{
  background:var(--yellow);
  color:var(--ink-on-signal);
}
.brand__text{display:block;min-width:0}
.brand__name{
  display:block;
  font-weight:900;
  font-size:clamp(19px,2.2vw,25px);
  line-height:1.15;
  letter-spacing:.02em;
}
.brand__sub{
  display:block;
  margin-top:5px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--muted);
}

.masthead-meta{
  display:flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
}
.version-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  padding:7px 11px;
  border:1px solid var(--line);
  background:var(--glass);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.version-chip__dot{
  width:7px;height:7px;
  border-radius:50%;
  background:var(--yellow);
  box-shadow:0 0 0 3px rgba(245,208,0,.16);
}
.version-chip__num{
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--glass);
  color:var(--paper);
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{
  background:var(--glass-2);
  border-color:var(--paper);
}
.btn--signal{
  background:var(--yellow);
  border-color:var(--yellow);
  color:var(--ink-on-signal);
}
.btn--signal:hover{
  background:#FFE23D;
  border-color:#FFE23D;
  color:var(--ink-on-signal);
}
.btn--ghost{background:transparent}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--glass);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  cursor:pointer;
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:1.5px;
  background:currentColor;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle__label{line-height:1}
.nav-toggle[aria-expanded="true"]{
  border-color:var(--yellow);
  color:var(--yellow);
}

/* ---------- 栏目条带 ---------- */
.site-nav{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(11,31,26,.9);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.site-nav__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  min-height:var(--nav-h);
}
.nav-list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:2px;
}
.nav-list a{
  display:block;
  padding:14px;
  border-bottom:2px solid transparent;
  color:var(--muted);
  font-size:14.5px;
  font-weight:500;
  letter-spacing:.06em;
  text-decoration:none;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.nav-list a:hover{
  color:var(--paper);
  background:var(--glass);
}
.nav-list a[aria-current="page"]{
  color:var(--yellow);
  border-bottom-color:var(--yellow);
  background:var(--glass);
}

.season-scale{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--muted);
  white-space:nowrap;
}
.season-scale__rail{
  display:block;
  width:clamp(56px,9vw,120px);
  height:11px;
  border-bottom:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 9px);
  background-position:left bottom;
  background-repeat:repeat-x;
  background-size:auto 8px;
}
.season-scale__value{
  color:var(--yellow);
  font-variant-numeric:tabular-nums;
}

/* ---------- 阅读进度 ---------- */
.read-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  z-index:60;
  background:rgba(242,245,244,.06);
  pointer-events:none;
}
.read-progress > span{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--yellow),var(--red));
  transition:transform .12s linear;
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(56px,9vw,120px);
  background:var(--ink-deep);
  border-top:1px solid var(--line);
  color:var(--muted);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr repeat(4,minmax(0,1fr));
  gap:clamp(22px,3vw,44px);
  padding:clamp(40px,6vw,76px) 0 clamp(30px,4vw,52px);
}
.footer-brand__name{
  margin:0 0 10px;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(20px,2.4vw,26px);
  letter-spacing:.02em;
  color:var(--paper);
}
.footer-brand__desc{
  margin:0;
  max-width:34ch;
  font-size:14px;
  line-height:1.8;
  color:var(--muted);
}
.footer-plate{
  display:inline-flex;
  align-items:baseline;
  gap:10px;
  margin:18px 0 0;
  padding:8px 12px;
  border:1px solid var(--line);
  background:var(--glass);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
}
.footer-plate__k{color:var(--muted)}
.footer-plate__v{color:var(--yellow)}

.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--paper);
}
.footer-col__list{display:block}
.footer-col__list li + li{margin-top:10px}
.footer-col__list a{
  font-size:14.5px;
  letter-spacing:.03em;
  color:var(--muted);
  text-decoration:none;
  transition:color .18s var(--ease);
}
.footer-col__list a:hover{color:var(--yellow)}
.footer-col__meta{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:#7A8C88;
  word-break:break-all;
}

.footer-base{
  border-top:1px solid var(--line-soft);
  background:rgba(0,0,0,.18);
}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 26px;
  padding:18px 0;
}
.footer-base__line{
  margin:0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--muted);
}

/* ---------- 通用区块 ---------- */
.section{padding:clamp(36px,6vw,84px) 0}
.section--tight{padding:clamp(24px,4vw,48px) 0}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:14px 28px;
  margin-bottom:clamp(20px,3vw,36px);
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.eyebrow{
  margin:0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.22em;
  color:var(--yellow);
  text-transform:uppercase;
}
.display{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(38px,7vw,92px);
  line-height:.96;
  letter-spacing:-.02em;
  color:var(--paper);
}
.title{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(24px,3.4vw,42px);
  line-height:1.14;
  letter-spacing:-.01em;
  color:var(--paper);
}
.lede{
  margin:0;
  max-width:62ch;
  font-size:clamp(16px,1.4vw,19px);
  line-height:1.85;
  color:#C6D2CF;
}
.measure{max-width:64ch}
.divider{
  height:1px;
  margin:clamp(24px,4vw,48px) 0;
  border:0;
  background:var(--line);
}

/* ---------- 栅格 ---------- */
.grid{display:grid;gap:clamp(14px,2vw,26px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.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}
.span-12{grid-column:span 12}

/* ---------- 面板 ---------- */
.panel{
  padding:clamp(18px,2.4vw,30px);
  border:1px solid var(--line);
  background:var(--panel);
}
.panel--glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.panel__title{
  margin:0 0 10px;
  font-size:19px;
  font-weight:900;
  letter-spacing:.01em;
  color:var(--paper);
}
.panel__text{
  margin:0;
  font-size:14.5px;
  line-height:1.8;
  color:var(--muted);
}

/* ---------- 说明牌 ---------- */
.plate{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 20px;
  margin:0;
  padding:10px 0 10px 14px;
  border-left:3px solid var(--yellow);
}
.plate__k{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--muted);
}
.plate__v{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}

/* ---------- 数字卡 ---------- */
.stat{
  padding:16px 18px;
  border:1px solid var(--line);
  background:var(--glass);
}
.stat__value{
  margin:0;
  font-family:var(--font-mono);
  font-size:clamp(26px,3.2vw,40px);
  font-weight:700;
  line-height:1;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}
.stat__label{
  margin:10px 0 0;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--muted);
}
.stat--signal .stat__value{color:var(--yellow)}
.stat--alert .stat__value{color:var(--red)}
.stat--cool .stat__value{color:var(--teal)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--muted);
  white-space:nowrap;
}
.tag--yellow{background:var(--yellow);border-color:var(--yellow);color:var(--ink-on-signal)}
.tag--red{background:var(--red);border-color:var(--red);color:#FFFFFF}
.tag--teal{background:var(--teal);border-color:var(--teal);color:var(--ink-on-signal)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  padding:16px 0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
}
.breadcrumbs li{display:flex;align-items:center;gap:10px}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--paper)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}

/* ---------- 章节目录 ---------- */
.toc{
  position:sticky;
  top:calc(var(--nav-h) + 24px);
  align-self:start;
}
.toc__title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--muted);
}
.toc a{
  display:block;
  padding:9px 0 9px 14px;
  border-left:2px solid var(--line-soft);
  color:var(--muted);
  font-size:14px;
  line-height:1.5;
  text-decoration:none;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.toc a:hover{
  color:var(--paper);
  border-left-color:var(--teal);
}
.toc a[aria-current="true"]{
  color:var(--yellow);
  border-left-color:var(--yellow);
}

/* ---------- 刻度与框景 ---------- */
.rule-scale{
  height:16px;
  border-bottom:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 14px);
  background-position:left bottom;
  background-repeat:repeat-x;
  background-size:auto 9px;
}
.frame{
  position:relative;
  border:1px solid var(--line);
  background:var(--glass);
}
.frame::before,
.frame::after{
  content:"";
  position:absolute;
  width:16px;height:16px;
  border:1px solid var(--yellow);
  pointer-events:none;
}
.frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}

/* ---------- 链接 ---------- */
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--teal);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
}
.link-arrow::after{
  content:"→";
  transition:transform .18s var(--ease);
}
.link-arrow:hover{color:var(--paper)}
.link-arrow:hover::after{transform:translateX(4px)}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background-color:var(--panel);
  background-image:
    linear-gradient(135deg,rgba(99,210,196,.14),transparent 58%),
    radial-gradient(120% 100% at 18% 12%,rgba(245,208,0,.10),transparent 60%);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(242,245,244,.045) 0 1px,transparent 1px 30px),
    repeating-linear-gradient(90deg,rgba(242,245,244,.045) 0 1px,transparent 1px 30px);
}
.media-frame img,
.media-frame picture img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__tag{
  position:absolute;
  left:0;bottom:0;
  z-index:1;
  padding:7px 12px;
  background:var(--paper);
  color:var(--ink-on-signal);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
}
.media-frame__caption{
  margin:12px 0 0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--muted);
}

/* ---------- 数据表 ---------- */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  background:var(--panel);
  -webkit-overflow-scrolling:touch;
}
.data-table{
  width:100%;
  min-width:560px;
  border-collapse:collapse;
  font-size:14px;
  font-variant-numeric:tabular-nums;
}
.data-table caption{
  padding:14px 16px;
  text-align:left;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--muted);
}
.data-table th{
  padding:12px 16px;
  border-bottom:1px solid var(--line);
  background:rgba(242,245,244,.05);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  text-align:left;
  color:var(--muted);
  white-space:nowrap;
}
.data-table td{
  padding:12px 16px;
  border-bottom:1px solid var(--line-soft);
  color:#D6DEDC;
}
.data-table tbody tr:hover{background:rgba(99,210,196,.07)}
.data-table .is-num{
  font-family:var(--font-mono);
  text-align:right;
  font-variant-numeric:tabular-nums;
}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
  .toc{position:static}
  .span-3,.span-4,.span-5{grid-column:span 6}
  .span-7,.span-8{grid-column:span 12}
}

/* ---------- 移动 ---------- */
@media (max-width:900px){
  .masthead-top__inner{
    align-items:center;
    padding:16px 0;
  }
  .brand__mark{width:38px;height:38px;font-size:13px}
  .brand__sub{font-size:11px}
  .version-chip{display:none}
  .masthead-meta .btn--signal{padding:9px 14px;font-size:13px}
  .nav-toggle{display:inline-flex}

  .site-nav__inner{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-list{
    display:none;
    flex-direction:column;
    align-items:stretch;
    padding:6px 0 12px;
  }
  .site-nav[data-open] .nav-list{display:flex}
  .nav-list a{
    padding:13px 4px;
    border-bottom:1px solid var(--line-soft);
    border-left:2px solid transparent;
  }
  .nav-list a:hover{background:transparent}
  .nav-list a[aria-current="page"]{
    padding-left:12px;
    border-bottom-color:var(--line-soft);
    border-left-color:var(--yellow);
    background:transparent;
  }
  .season-scale{
    display:none;
    padding:0 4px 16px;
  }
  .site-nav[data-open] .season-scale{display:flex}
}

@media (max-width:680px){
  .span-3,.span-4,.span-5,.span-6{grid-column:span 12}
  .display{font-size:clamp(34px,10vw,52px)}
}

@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr}
  .footer-base__inner{flex-direction:column;align-items:flex-start}
  .masthead-meta{width:100%;justify-content:space-between}
}

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