*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}

:root{
  --deep:#0B1B3A;
  --deep-2:#12274F;
  --track:#1B3A6B;
  --night:#050D1F;
  --purple:#6C4AB6;
  --purple-soft:#9B7BE0;
  --gold:#F5C542;
  --gold-soft:#FFE9A6;
  --cyan:#4DD0E1;
  --text:#E9EEF9;
  --muted:#93A6C6;
  --line:rgba(147,166,198,.16);
  --line-strong:rgba(147,166,198,.34);
  --surface:rgba(27,58,107,.24);
  --font-sans:system-ui,-apple-system,"Source Han Sans SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"JetBrains Mono",Consolas,monospace;
  --shell:1240px;
  --gutter:clamp(20px,4vw,48px);
  --header-h:76px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-soft:0 10px 30px rgba(5,13,31,.45);
}

body{
  background:var(--deep);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{line-height:1.28;font-weight:700}
strong{font-weight:600}

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

/* ---------- 通用容器与网格 ---------- */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,24px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

.section{padding:clamp(48px,7vw,88px) 0}
.section--deep{background:var(--deep-2)}
.section__title{font-size:clamp(22px,2.6vw,28px);letter-spacing:.05em;margin:0 0 10px}
.section__lede{color:var(--muted);font-size:16px;max-width:62ch;margin:0 0 32px}

.prose{max-width:74ch;font-size:17px;line-height:1.75}
.prose p{margin:0 0 1.2em}
.prose h3{font-size:22px;font-weight:600;letter-spacing:.02em;margin:2em 0 .6em}
.prose ul{list-style:none;margin:0 0 1.2em}
.prose li{position:relative;padding-left:20px;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--gold)}

/* ---------- 章节长卷 ---------- */
.chapter{margin-top:clamp(72px,10vw,120px)}
.chapter:first-child{margin-top:0}
.chapter__head{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,2vw,24px);align-items:end}
.chapter__index{grid-column:1 / span 2;font-family:var(--font-mono);font-size:14px;font-weight:600;letter-spacing:.2em;color:var(--gold)}
.chapter__title{grid-column:3 / span 8;font-size:clamp(26px,3.4vw,34px);letter-spacing:.06em;margin:0}
.chapter__band{height:3px;margin-top:20px;background:linear-gradient(90deg,var(--purple) 0%,rgba(108,74,182,.25) 42%,transparent 100%)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;letter-spacing:.06em;padding:12px 22px;
  border:1px solid transparent;background:transparent;color:var(--text);
  cursor:pointer;transition:background-color .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease),transform .24s var(--ease);
}
.btn--gold{background:var(--gold);color:var(--night);font-weight:700}
.btn--gold:hover{background:var(--gold-soft);transform:translateY(-2px)}
.btn--outline{border-color:var(--track);color:var(--text)}
.btn--outline:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--ghost{border-color:var(--line-strong);color:var(--muted)}
.btn--ghost:hover{color:var(--text);border-color:var(--cyan)}
.btn--sm{padding:8px 14px;font-size:13px}

.icon-btn{
  font-size:12px;letter-spacing:.1em;padding:6px 12px;
  background:transparent;border:1px solid var(--track);color:var(--muted);cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.icon-btn:hover{color:var(--text);border-color:var(--cyan)}

/* ---------- 检索抽屉内的表单件 ---------- */
.field{display:grid;gap:8px}
.field__label{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--muted)}
.field__input{
  width:100%;font-size:15px;padding:12px 14px;
  background:rgba(18,39,79,.75);border:1px solid var(--track);color:var(--text);
  transition:border-color .2s var(--ease);
}
.field__input::placeholder{color:rgba(147,166,198,.68)}
.field__input:focus{border-color:var(--cyan);outline-offset:1px}

/* ---------- 筛选 chip ---------- */
.chip-set{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  padding:6px 12px;background:transparent;border:1px solid var(--track);color:var(--muted);cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.chip:hover{color:var(--text);border-color:var(--purple-soft)}
.chip[aria-pressed="true"]{color:var(--gold);border-color:var(--cyan);background:rgba(77,208,225,.08)}

/* ---------- 卡片 / 表格 / 图例 / 坐标 ---------- */
.card{
  background:var(--surface);border:1px solid var(--track);padding:22px;box-shadow:var(--shadow-soft);
  transition:transform .24s var(--ease),border-color .24s var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:var(--cyan)}
.card__title{font-size:18px;font-weight:600;letter-spacing:.02em;margin:0 0 8px}
.card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);margin:0}

.data-table{width:100%;border-collapse:collapse;font-size:15px}
.data-table th,.data-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.data-table th{font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.14em;color:var(--muted)}
.data-table td.is-num{text-align:right;font-family:var(--font-mono);font-weight:600;color:var(--gold)}
.data-table .unit{font-family:var(--font-mono);font-size:13px;color:var(--muted)}

.legend{display:grid;gap:10px;border:1px solid var(--track);background:rgba(18,39,79,.6);padding:16px}
.legend__item{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.legend__dot{width:8px;height:8px;flex:none;background:var(--cyan)}
.legend__dot--gold{background:var(--gold)}
.legend__dot--purple{background:var(--purple-soft)}

.coord{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--muted)}
.coord--gold{color:var(--gold)}

.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted)}
.breadcrumb a{color:var(--muted);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb__sep{color:var(--track)}
.breadcrumb [aria-current="page"]{color:var(--gold)}

/* ---------- 图形容器（页面阶段放置 SVG 星图 / 界面轮廓） ---------- */
.media-frame{position:relative;border:1px solid var(--track);overflow:hidden;background:linear-gradient(150deg,rgba(108,74,182,.22),rgba(11,27,58,.92))}
.media-frame::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(147,166,198,.4) 1px,transparent 1px);
  background-size:16px 16px;opacity:.5;
}
.media-frame__body{position:relative;aspect-ratio:16 / 9}
.media-frame--wide .media-frame__body{aspect-ratio:21 / 9}
.media-frame--tall .media-frame__body{aspect-ratio:4 / 5}
.media-frame--cut .media-frame__body{clip-path:polygon(0 0,100% 0,100% 88%,0 100%)}
.media-frame__art{width:100%;height:100%;object-fit:cover}
.media-frame__caption{position:relative;padding:12px 16px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);border-top:1px solid var(--line)}

/* ---------- 滚动显现 ---------- */
[data-reveal]{transition:opacity .55s var(--ease),transform .55s var(--ease);transition-delay:calc(var(--reveal-index,0) * 60ms)}
html.js [data-reveal]{opacity:0;transform:translateY(12px)}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 头部 ---------- */
.skip-link{
  position:fixed;left:14px;top:-80px;z-index:200;
  padding:10px 18px;background:var(--gold);color:var(--night);font-weight:700;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

.site-header{position:sticky;top:0;z-index:60;background:var(--deep);border-bottom:1px solid transparent;transition:background-color .24s var(--ease),border-color .24s var(--ease)}
.site-header[data-scrolled="true"]{background:var(--night);border-bottom-color:var(--line)}
.site-header__bar{position:relative}
.site-header__inner{
  display:flex;align-items:center;gap:clamp(14px,2.4vw,36px);
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:0 var(--gutter);min-height:var(--header-h);
}

.brand{display:flex;align-items:baseline;gap:16px;min-width:0}
.brand__mark{display:flex;align-items:baseline;gap:8px}
.brand__name{font-size:22px;font-weight:700;letter-spacing:.14em;white-space:nowrap}
.brand__sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--cyan);padding:2px 6px;border:1px solid rgba(77,208,225,.38);white-space:nowrap}
.brand__tagline{margin:0;font-size:13px;letter-spacing:.04em;color:var(--muted);white-space:nowrap;transition:font-size .24s var(--ease),opacity .24s var(--ease)}
.site-header[data-scrolled="true"] .brand__tagline{font-size:12px;opacity:.72}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:clamp(6px,1.4vw,20px)}
.site-nav__item{flex:none}
.site-nav__link{position:relative;display:block;padding:9px 2px;font-size:15px;letter-spacing:.06em;transition:color .2s var(--ease)}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease)}
.site-nav__link:hover{color:var(--gold-soft)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--gold)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.site-header__tools{display:flex;align-items:center;gap:10px}
.search-open__icon{position:relative;width:12px;height:12px;flex:none;border:1.5px solid currentColor;border-radius:50%}
.search-open__icon::after{content:"";position:absolute;right:-5px;bottom:-3px;width:6px;height:1.5px;background:currentColor;transform:rotate(45deg);transform-origin:left center}

.nav-toggle{display:none;align-items:center;gap:9px;padding:8px 12px;background:transparent;border:1px solid var(--track);color:var(--text);font-size:13px;letter-spacing:.08em;cursor:pointer}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{display:block;height:1px;background:currentColor;transition:transform .24s var(--ease),opacity .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) 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(-5px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

.scroll-rail{height:2px;background:rgba(147,166,198,.14);overflow:hidden}
.scroll-rail__fill{display:block;height:100%;width:0;background:var(--cyan);transition:width .12s linear}

/* ---------- 检索抽屉 ---------- */
.search-drawer{
  position:fixed;inset:0;z-index:80;display:flex;justify-content:flex-end;
  background:rgba(5,13,31,.74);
  opacity:0;visibility:hidden;
  transition:opacity .24s var(--ease),visibility .24s var(--ease);
}
.search-drawer[data-open="true"]{opacity:1;visibility:visible}
.search-drawer__panel{
  width:min(440px,100%);height:100%;overflow:auto;
  background:var(--night);border-left:1px solid var(--track);
  padding:clamp(20px,4vw,32px);
  transform:translateX(24px);transition:transform .28s var(--ease);
}
.search-drawer[data-open="true"] .search-drawer__panel{transform:none}
.search-drawer__head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}
.search-drawer__title{margin:0;font-size:18px;font-weight:600;letter-spacing:.08em}
.search-drawer__body{display:grid;gap:18px}
.search-drawer__empty{padding:16px 10px;font-size:14px;color:var(--muted)}

.result-list{display:grid;gap:2px}
.result-list__item{list-style:none}
.result-list__link{
  display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;
  padding:12px 10px;border-bottom:1px solid var(--line);border-left:2px solid transparent;
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
.result-list__link:hover{background:rgba(108,74,182,.16);border-left-color:var(--cyan)}
.result-list__code{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--gold)}
.result-list__text{font-size:15px}
.result-list__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-footer{margin-top:clamp(72px,9vw,120px);background:var(--night);border-top:1px solid var(--track)}
.site-footer__inner{
  display:grid;grid-template-columns:1.5fr repeat(3,minmax(0,1fr));
  gap:clamp(24px,4vw,48px);
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:clamp(48px,7vw,80px) var(--gutter) clamp(28px,4vw,44px);
}
.site-footer__mark{font-size:22px;font-weight:700;letter-spacing:.14em;color:var(--text);margin:0 0 10px}
.site-footer__desc{font-size:15px;color:var(--text);margin:0 0 8px}
.site-footer__meta{font-size:13px;color:var(--muted);margin:0}

.footer-col__title{
  position:relative;margin:0 0 16px;padding-left:12px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.18em;color:var(--purple-soft);
}
.footer-col__title::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:3px;background:var(--purple)}
.footer-col__list{display:grid;gap:10px}
.footer-col__item{font-size:15px;color:var(--muted)}
.footer-col__item a{color:var(--muted);transition:color .2s var(--ease)}
.footer-col__item a:hover{color:var(--cyan)}
.footer-col__text{color:var(--muted)}

.site-footer__contact{
  display:flex;flex-wrap:wrap;gap:12px 36px;
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:24px var(--gutter);border-top:1px solid var(--line);
}
.site-footer__contact-item{font-family:var(--font-mono);font-size:14px;letter-spacing:.02em;color:var(--muted)}
.site-footer__contact-item strong{color:var(--text);font-weight:600}
.site-footer__contact-note{
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:0 var(--gutter) 20px;font-size:13px;color:var(--muted);
}
.site-footer__base{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  width:100%;max-width:var(--shell);margin:0 auto;
  padding:18px var(--gutter) 32px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.site-footer__icp{color:var(--muted)}

/* ---------- 平板 ---------- */
@media (max-width:1023px){
  :root{--header-h:64px}
  .brand__tagline{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);
    max-height:calc(100vh - var(--header-h));overflow:auto;
    margin-left:0;padding:8px var(--gutter) 28px;
    background:var(--night);border-bottom:1px solid var(--line);
    opacity:0;visibility:hidden;transform:translateY(-12px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-bottom:1px solid var(--line)}
  .site-nav__link{padding:15px 2px;font-size:17px}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{padding-left:12px;box-shadow:inset 3px 0 0 var(--gold)}
  .site-header__tools{margin-left:auto}
  .site-footer__inner{grid-template-columns:1fr 1fr}
}

@media (max-width:900px){
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9{grid-column:1 / -1}
  .chapter__index{grid-column:1 / -1}
  .chapter__title{grid-column:1 / -1;font-size:clamp(24px,6vw,30px)}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  body{font-size:16px}
  .site-header__inner{gap:10px}
  .brand__sub{display:none}
  .search-open__text{display:none}
  .search-open{padding:8px 10px}
  .nav-toggle__label{display:none}
  .site-footer__inner{grid-template-columns:1fr;padding-top:44px}
  .site-footer__contact{flex-direction:column;gap:8px}
  .search-drawer__panel{width:100%;border-left:none}
}

/* ---------- 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 [data-reveal]{opacity:1;transform:none;transition:none}
  [data-reveal]{transition-delay:0ms !important}
  .btn--gold:hover,.card:hover{transform:none}
  .scroll-rail__fill{transition:none}
}