/* =========================================================
   /assets/site.css — 共享外壳与通用组件
   ========================================================= */

/* ---------- 1. 重置 ---------- */
*,*::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{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
kbd{font:inherit}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 变量 ---------- */
:root{
  --navy:#0B2A4A;
  --navy-2:#123C66;
  --orange:#FF7A1A;
  --orange-soft:#FFB067;
  --signal:#2EC4B6;
  --signal-ink:#0E6B63;
  --paper:#F4F1EC;
  --white:#FFFFFF;
  --ink:#1C1F24;
  --muted:#6B7280;
  --track:#E4DED4;

  --rail-w:88px;
  --bar-h:60px;
  --r-card:10px;
  --r-sharp:2px;

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

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 中文排版基座 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (min-width:901px){
  body{padding-left:var(--rail-w)}
}

h1,.h1{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(40px,5.2vw,64px);
  line-height:1.08;
  letter-spacing:-.02em;
  color:var(--navy);
}
h2,.h2{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(26px,3vw,34px);
  line-height:1.2;
  letter-spacing:-.02em;
  color:var(--navy);
}
h3,.h3{
  font-size:20px;
  font-weight:700;
  line-height:1.35;
  letter-spacing:-.01em;
  color:var(--ink);
}
.prose{font-size:17px;line-height:1.7;color:var(--ink)}
.prose p{max-width:38em}
.prose p+p{margin-top:1em}
.prose ul{max-width:38em;margin-top:.8em}
.prose li{position:relative;padding-left:18px;margin-top:.4em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:2px;background:var(--orange)}

.mono,.footer-brand__batch,.brand-rail__code{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--orange);
}
.annotation{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-size:12px;
  letter-spacing:.3em;
  line-height:1;
  color:var(--muted);
}
.rule{height:1px;background:var(--track);border:0;margin:0}
.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:-9999px;top:0;
  z-index:200;
  padding:10px 18px;
  background:var(--orange);
  color:var(--navy);
  font-weight:700;
  font-size:14px;
  text-decoration:none;
  border-radius:0 0 var(--r-sharp) 0;
}
.skip-link:focus{left:8px;top:8px;outline:3px solid var(--navy);outline-offset:2px}

/* ---------- 5. 品牌轨道 ---------- */
.brand-rail{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail-w);
  z-index:70;
  display:flex;
  flex-direction:column;
  align-items:center;
  padding:22px 0 26px;
  background:var(--navy);
  border-right:1px solid rgba(255,255,255,.08);
}
.brand-rail__word{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-family:var(--font-display);
  font-weight:700;
  font-size:21px;
  letter-spacing:.2em;
  color:#fff;
}
.brand-rail__rule{
  position:relative;
  flex:1;
  width:2px;
  margin:22px 0;
  background:rgba(255,255,255,.2);
}
.brand-rail__rule::before{
  content:"";
  position:absolute;
  left:0;top:0;
  width:2px;height:42%;
  background:var(--orange);
}
.brand-rail__rule::after{
  content:"";
  position:absolute;
  left:50%;top:42%;
  width:10px;height:10px;
  margin:-5px 0 0 -5px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 4px rgba(255,122,26,.22);
}
.brand-rail__tag{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-size:12px;
  letter-spacing:.3em;
  color:rgba(255,255,255,.66);
}
.brand-rail__code{
  margin-top:auto;
  padding-top:18px;
  color:var(--orange-soft);
  font-size:11px;
}

/* ---------- 6. 命令栏 ---------- */
.site-header{position:sticky;top:0;z-index:60}
.command-bar{
  position:relative;
  background:var(--navy);
  color:#fff;
  transition:background .25s var(--ease),box-shadow .25s var(--ease);
}
.site-header.is-stuck .command-bar{
  background:rgba(11,42,74,.86);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  backdrop-filter:blur(12px) saturate(140%);
  box-shadow:0 1px 0 rgba(255,255,255,.12);
}
.command-bar__inner{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:var(--bar-h);
  padding:8px 20px;
}
.command-bar__brand{
  display:none;
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  color:#fff;
  text-decoration:none;
  white-space:nowrap;
}
.command-bar__brand:hover{color:var(--orange-soft)}

/* 栏目索引 */
.nav-index{order:2}
.nav-index__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-index__item{display:block}
.nav-index__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:7px 10px;
  border-radius:var(--r-sharp);
  font-size:13.5px;
  line-height:1.4;
  color:rgba(255,255,255,.76);
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-index__num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  color:rgba(255,255,255,.42);
  transition:color .18s var(--ease);
}
.nav-index__link:hover{color:#fff;background:rgba(255,255,255,.09)}
.nav-index__link:hover .nav-index__num{color:var(--orange-soft)}
.nav-index__link[aria-current="page"]{color:#fff;background:rgba(255,255,255,.1)}
.nav-index__link[aria-current="page"] .nav-index__num{color:var(--orange)}
.nav-index__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:10px;right:10px;bottom:2px;
  height:2px;
  background:var(--orange);
}

/* 检索入口 */
.cmd-search{
  order:3;
  margin-left:auto;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-width:176px;
  padding:7px 10px;
  border:1px solid rgba(255,255,255,.24);
  border-radius:var(--r-sharp);
  background:rgba(255,255,255,.06);
  font-size:12.5px;
  line-height:1.4;
  color:rgba(255,255,255,.72);
  text-decoration:none;
  transition:border-color .18s var(--ease),background .18s var(--ease),color .18s var(--ease);
}
.cmd-search:hover{border-color:var(--orange-soft);background:rgba(255,255,255,.13);color:#fff}
.cmd-search__icon{
  position:relative;
  flex:none;
  width:10px;height:10px;
  border:1.5px solid currentColor;
  border-radius:50%;
}
.cmd-search__icon::after{
  content:"";
  position:absolute;
  left:8px;top:7px;
  width:5px;height:1.5px;
  background:currentColor;
  transform:rotate(45deg);
}
.cmd-search__text{white-space:nowrap}
.cmd-search__key{
  margin-left:auto;
  padding:1px 5px;
  border:1px solid rgba(255,255,255,.3);
  border-radius:var(--r-sharp);
  font-family:var(--font-mono);
  font-size:10px;
  line-height:1.4;
  color:rgba(255,255,255,.6);
}
.cmd-cta{order:4;flex:none}

/* 移动导航按钮 */
.nav-toggle{
  order:5;
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 11px;
  border:1px solid rgba(255,255,255,.28);
  border-radius:var(--r-sharp);
  color:#fff;
  font-size:13px;
  line-height:1.2;
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--orange-soft);background:rgba(255,255,255,.1)}
.nav-toggle__label{letter-spacing:.04em}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;height:2px;
  background:currentColor;
  transition:background .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;height:2px;
  background:currentColor;
  transition:transform .2s var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

/* 滚动进度轨 */
.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(255,255,255,.12);
  overflow:hidden;
}
.scroll-progress > span{
  display:block;
  width:0;
  height:100%;
  background:var(--orange);
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid transparent;
  border-radius:var(--r-sharp);
  font-size:14px;
  font-weight:700;
  line-height:1.3;
  letter-spacing:.01em;
  text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn--primary{background:var(--orange);color:var(--navy)}
.btn--primary:hover{background:var(--orange-soft);transform:translateY(-1px)}
.btn--ghost{border-color:var(--navy);color:var(--navy);background:transparent}
.btn--ghost:hover{background:var(--navy);color:#fff}
.btn--quiet{border-color:var(--track);color:var(--ink);background:var(--white)}
.btn--quiet:hover{border-color:var(--navy)}
.command-bar .btn{padding:8px 15px;font-size:13.5px;white-space:nowrap}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:72px;
  background:var(--navy);
  color:rgba(255,255,255,.86);
  border-top:4px solid var(--orange);
}
.footer-inner{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:36px 32px;
  max-width:1280px;
  margin:0 auto;
  padding:56px clamp(20px,4vw,48px) 28px;
}
.footer-brand{
  grid-column:span 3;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:8px;
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:26px;
  font-weight:800;
  letter-spacing:-.02em;
  color:#fff;
}
.footer-brand__tag{
  font-size:13px;
  letter-spacing:.14em;
  color:rgba(255,255,255,.66);
}
.footer-brand__batch{
  margin-top:6px;
  padding:3px 8px;
  border:1px solid rgba(255,122,26,.5);
  border-radius:var(--r-sharp);
  color:var(--orange-soft);
  font-size:11px;
}
.site-footer .kicker{color:var(--orange-soft)}

.footer-nav{grid-column:span 5}
.footer-nav__title{margin-bottom:14px}
.footer-nav__list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:0 24px;
}
.footer-nav__link{
  display:block;
  padding:9px 0;
  border-bottom:1px solid rgba(255,255,255,.12);
  font-size:14px;
  color:rgba(255,255,255,.8);
  text-decoration:none;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-nav__link:hover{color:var(--orange-soft);border-bottom-color:var(--orange)}

.footer-contact{grid-column:span 4}
.footer-contact__row{
  display:flex;
  gap:12px;
  align-items:baseline;
  padding:9px 0;
  border-bottom:1px solid rgba(255,255,255,.12);
  font-size:13.5px;
  line-height:1.6;
}
.footer-contact__key{
  flex:none;
  width:46px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--orange-soft);
}
.footer-contact__value{color:rgba(255,255,255,.88);word-break:break-word}
.footer-contact__note{
  margin-top:14px;
  font-size:12.5px;
  line-height:1.7;
  color:rgba(255,255,255,.56);
  max-width:34em;
}

.footer-tasks{
  grid-column:span 12;
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;
  padding-top:8px;
}
.task-card{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:16px 18px;
  border:1px solid rgba(255,255,255,.16);
  border-radius:var(--r-sharp);
  background:rgba(255,255,255,.05);
  color:#fff;
  text-decoration:none;
  transition:border-color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease);
}
.task-card:hover{
  border-color:var(--orange);
  background:rgba(255,122,26,.14);
  transform:translateY(-3px);
}
.task-card__num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--orange-soft);
}
.task-card__label{font-size:15px;font-weight:600;line-height:1.4}

.footer-legal{
  grid-column:span 12;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,.14);
  font-size:12.5px;
  color:rgba(255,255,255,.56);
}
.footer-legal__icp{font-family:var(--font-mono);letter-spacing:.04em}

/* ---------- 9. 布局容器 ---------- */
.container{
  width:100%;
  max-width:1240px;
  margin-inline:auto;
  padding-inline:clamp(20px,4vw,48px);
}
.container--narrow{max-width:860px}
.grid{display:grid;gap:clamp(20px,3vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- 10. 内容层 ---------- */
.panel{
  background:var(--white);
  border:1px solid var(--track);
  border-radius:var(--r-card);
  padding:clamp(20px,3vw,32px);
}
.glass{
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.24);
  border-radius:var(--r-card);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

/* 图片容器基座 */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--track);
  border-radius:var(--r-card);
  background:
    linear-gradient(135deg,var(--navy-2) 0%,var(--navy) 58%,#081d33 100%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--portrait{aspect-ratio:4/5}
.media-frame img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.media-frame__caption{
  position:absolute;
  left:14px;bottom:14px;
  z-index:2;
  padding:4px 8px;
  border:1px solid rgba(255,255,255,.26);
  border-radius:var(--r-sharp);
  background:rgba(11,42,74,.74);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:#fff;
}
@media (max-width:600px){
  .media-frame--wide{aspect-ratio:16/10}
  .media-frame--portrait{aspect-ratio:4/5}
}

/* ---------- 11. 章节与标签 ---------- */
.section-num{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:34px;height:34px;
  padding:0 8px;
  background:var(--navy);
  color:#fff;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1;
  border-radius:var(--r-sharp);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--track);
  border-radius:var(--r-sharp);
  background:var(--white);
  color:var(--ink);
  font-size:12px;
  line-height:1.5;
}
.tag--signal{
  border-color:var(--signal);
  background:rgba(46,196,182,.12);
  color:var(--signal-ink);
}
.tag--signal::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:var(--signal);
}
.tag--batch{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  border-color:rgba(255,122,26,.5);
  color:#A84300;
  background:rgba(255,122,26,.1);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb{padding:20px 0 4px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  font-size:12.5px;
  line-height:1.5;
  color:var(--muted);
}
.breadcrumb__list li{display:flex;align-items:center}
.breadcrumb__list li+li::before{
  content:"/";
  margin:0 10px;
  font-family:var(--font-mono);
  color:var(--track);
}
.breadcrumb__link{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.breadcrumb__link:hover{color:var(--navy);border-bottom-color:var(--orange)}
.breadcrumb__current{color:var(--navy);font-weight:600}

/* ---------- 13. 显现协议 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 14. 焦点可见 ---------- */
:focus-visible{
  outline:3px solid var(--orange);
  outline-offset:2px;
  border-radius:var(--r-sharp);
}
.command-bar :focus-visible,
.site-footer :focus-visible{
  outline-color:var(--orange-soft);
}

/* ---------- 15. 响应式：平板与手机 ---------- */
@media (max-width:1100px) and (min-width:901px){
  .nav-index__link{padding:7px 7px;font-size:13px}
  .cmd-search{min-width:150px}
}

@media (max-width:900px){
  .brand-rail{display:none}
  body{padding-left:0}
  .command-bar__inner{padding:8px 14px;gap:8px}
  .command-bar__brand{display:inline-flex;order:1}
  .nav-toggle{display:inline-flex;order:5}
  .cmd-search{order:3;flex:1 1 auto;min-width:0}
  .cmd-search__text{
    overflow:hidden;
    text-overflow:ellipsis;
    white-space:nowrap;
  }
  .cmd-cta{order:4}
  .nav-index{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    order:2;
    max-height:72vh;
    overflow-y:auto;
    padding:8px 14px 16px;
    background:var(--navy-2);
    border-top:1px solid rgba(255,255,255,.14);
    box-shadow:0 18px 32px rgba(6,20,36,.4);
  }
  .nav-index[data-open="true"]{display:block}
  .nav-index__list{flex-direction:column;align-items:stretch;gap:0}
  .nav-index__link{
    justify-content:flex-start;
    padding:13px 8px;
    font-size:15px;
    border-bottom:1px solid rgba(255,255,255,.1);
    border-radius:0;
  }
  .nav-index__link[aria-current="page"]{background:rgba(255,122,26,.16)}
  .nav-index__link[aria-current="page"]::after{
    left:auto;right:8px;top:50%;bottom:auto;
    width:14px;height:2px;
    margin-top:-1px;
  }

  .footer-inner{grid-template-columns:repeat(6,minmax(0,1fr));gap:28px 24px;padding:44px 20px 24px}
  .footer-brand{grid-column:span 6}
  .footer-nav{grid-column:span 3}
  .footer-contact{grid-column:span 3}
  .footer-tasks{grid-column:span 6;grid-template-columns:repeat(3,minmax(0,1fr))}

  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  body{font-size:16px}
  .command-bar__inner{min-height:56px}
  .nav-toggle__label{display:none}
  .cmd-search__key{display:none}
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-brand,.footer-nav,.footer-contact,.footer-tasks,.footer-legal{grid-column:span 1}
  .footer-nav__list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-tasks{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;gap:8px}
  .site-footer{margin-top:48px}
}

/* ---------- 16. 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .task-card:hover,.btn--primary:hover{transform:none}
}