:root{
  --fx-orange:#FF5A1F;
  --fx-orange-soft:#FF8A3D;
  --fx-orange-deep:#B33B0C;
  --fx-ink:#120E0C;
  --fx-ink-2:#1E1915;
  --fx-cream:#F7F3EF;
  --fx-white:#FFFFFF;
  --fx-mint:#00E5A8;
  --fx-violet:#6C4BFF;
  --fx-violet-light:#A18CFF;
  --fx-grey:#A6A09A;
  --fx-grey-ink:#6B6560;
  --fx-line:#332B25;
  --fx-line-soft:rgba(166,160,154,.24);
  --fx-glass:rgba(30,25,21,.66);
  --font-sans:'Inter','PingFang SC','Source Han Sans SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1200px;
  --announce-h:36px;
  --header-bar:78px;
  --header-space:calc(var(--announce-h) + var(--header-bar));
  --ease-out:cubic-bezier(.22,.75,.3,1);
  --radius:2px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-top:var(--header-space);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.65;
  color:var(--fx-ink);
  background:var(--fx-cream);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{margin:0;line-height:1.05;letter-spacing:-.02em;font-weight:800}
p{margin:0 0 1em}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0}
img,svg{max-width:100%}
:focus-visible{outline:2px solid var(--fx-mint);outline-offset:3px}

.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:.5rem;left:.5rem;z-index:200;
  transform:translateY(-220%);
  background:var(--fx-orange);color:#100B08;
  padding:.6rem 1rem;font-size:14px;font-weight:700;border-radius:var(--radius);
  transition:transform .18s var(--ease-out);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 顶部公告 ---------- */
.announce-bar{
  background:var(--fx-ink);
  border-bottom:1px solid var(--fx-line);
  color:var(--fx-cream);
}
.announce-bar[data-dismissed="true"]{display:none}
.announce-inner{
  display:flex;align-items:center;gap:.7rem;
  width:min(100% - 2rem,var(--shell));margin-inline:auto;
  height:var(--announce-h);
  font-size:12px;
}
.announce-tag{
  flex:none;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--fx-mint);border:1px solid rgba(0,229,168,.45);
  padding:.1rem .4rem;border-radius:var(--radius);
}
.announce-text{
  margin:0;flex:1 1 auto;min-width:0;
  white-space:nowrap;overflow-x:auto;overflow-y:hidden;
  color:rgba(247,243,239,.86);
  scrollbar-width:none;
}
.announce-text::-webkit-scrollbar{display:none}
.announce-link{
  flex:none;color:var(--fx-orange);font-weight:700;
  border-bottom:1px solid currentColor;padding-bottom:1px;
}
.announce-link:hover{color:var(--fx-orange-soft)}
.announce-close{
  flex:none;width:24px;height:24px;display:grid;place-items:center;
  border:1px solid transparent;border-radius:var(--radius);
  color:var(--fx-grey);font-size:15px;line-height:1;cursor:pointer;
  transition:color .16s var(--ease-out),border-color .16s var(--ease-out);
}
.announce-close:hover{color:var(--fx-orange);border-color:var(--fx-line)}

/* ---------- 页头主体 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:120;color:var(--fx-white)}
.header-shell{
  background:linear-gradient(180deg,rgba(12,9,7,.86) 0%,rgba(12,9,7,.5) 60%,rgba(12,9,7,0) 100%);
  transition:background-color .25s var(--ease-out),box-shadow .25s var(--ease-out);
}
.header-inner{
  display:flex;align-items:center;gap:1.5rem;
  width:min(100% - 2rem,var(--shell));margin-inline:auto;
  padding-block:18px;
  transition:padding .22s var(--ease-out);
}
.site-header[data-scrolled="true"] .header-shell{
  background:rgba(18,14,12,.97);
  border-bottom:1px solid var(--fx-line);
  box-shadow:0 18px 44px rgba(0,0,0,.45);
}
.site-header[data-scrolled="true"] .header-inner{padding-block:10px}

.brand{display:flex;align-items:center;gap:.7rem;flex:none;color:var(--fx-white)}
.brand-mark{
  position:relative;display:block;flex:none;
  width:30px;height:30px;background:var(--fx-orange);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.brand-mark::after{
  content:"";position:absolute;right:7px;top:7px;width:7px;height:7px;
  background:var(--fx-ink);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:17px;font-weight:800;letter-spacing:.01em;color:var(--fx-white)}
.brand-sub{
  font-family:var(--font-mono);font-size:9px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--fx-grey);
}

/* ---------- 导航 ---------- */
.site-nav{display:flex;align-items:center;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:.15rem}
.nav-link{
  position:relative;display:inline-block;
  padding:.45rem .6rem;
  font-size:13.5px;font-weight:600;letter-spacing:.02em;
  color:rgba(247,243,239,.78);white-space:nowrap;
  transition:color .16s var(--ease-out);
}
.nav-link::after{
  content:"";position:absolute;left:.6rem;right:.6rem;bottom:-1px;height:2px;
  background:var(--fx-orange);transform:scaleX(0);transform-origin:left center;
  transition:transform .18s var(--ease-out);
}
.nav-link:hover{color:var(--fx-white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--fx-white)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- 入口矩阵 ---------- */
.entry-matrix{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;flex:none;
  background:var(--fx-line);border:1px solid var(--fx-line);
}
.entry-cell{
  display:flex;flex-direction:column;gap:.1rem;
  min-width:106px;padding:.45rem .65rem;
  background:rgba(18,14,12,.78);
  transition:background-color .16s var(--ease-out);
}
.entry-cell:hover,.entry-cell:focus-visible{background:rgba(255,90,31,.16)}
.entry-label{font-size:12.5px;font-weight:700;letter-spacing:.02em;color:var(--fx-white)}
.entry-cell:hover .entry-label{color:var(--fx-orange-soft)}
.entry-hint{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.08em;
  color:var(--fx-grey);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{display:none;align-items:center;gap:.5rem}

.nav-toggle{
  border:1px solid var(--fx-line);border-radius:var(--radius);
  padding:.5rem .7rem;cursor:pointer;color:var(--fx-white);
  transition:border-color .16s var(--ease-out),color .16s var(--ease-out);
}
.nav-toggle:hover{border-color:var(--fx-orange);color:var(--fx-orange)}
.nav-toggle[aria-expanded="true"]{border-color:var(--fx-orange);color:var(--fx-orange)}
.nav-bars{position:relative;display:block;width:16px;height:2px;background:currentColor}
.nav-bars::before,.nav-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;
  transition:transform .18s var(--ease-out),opacity .18s var(--ease-out);
}
.nav-bars::before{top:-5px}
.nav-bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-bars::before{transform:translateY(5px);opacity:0}
.nav-toggle[aria-expanded="true"] .nav-bars::after{transform:translateY(-5px);opacity:0}
.nav-toggle-text{font-size:12px;font-weight:700;letter-spacing:.08em}

/* ---------- 阅读进度 ---------- */
.progress-bar{height:2px;background:rgba(247,243,239,.08);overflow:hidden}
.progress-fill{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--fx-orange),var(--fx-orange-soft));
  transition:transform .1s linear;
}

/* ---------- 通用布局 ---------- */
.container{width:min(100% - 2.5rem,var(--shell));margin-inline:auto}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(1rem,2vw,1.75rem)}
.under-header{margin-top:calc(var(--header-space) * -1);padding-top:var(--header-space)}
.section{position:relative;padding-block:clamp(3rem,6vw,6rem)}
.section--ink{background:var(--fx-ink);color:rgba(247,243,239,.84)}
.section--cream{background:var(--fx-cream);color:var(--fx-ink)}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:.75rem 1.5rem;margin-bottom:clamp(1.5rem,3vw,2.5rem)}
.section-index{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--fx-orange-deep);
}
.section-title{font-size:clamp(1.8rem,4vw,3rem);letter-spacing:-.02em}
.section-lede{margin:0;max-width:52ch;font-size:15px;color:var(--fx-grey-ink)}
.section--ink .section-index{color:var(--fx-orange)}
.section--ink .section-title{color:var(--fx-white)}
.section--ink .section-lede{color:var(--fx-grey)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  min-height:44px;padding:.7rem 1.35rem;
  font-size:14px;font-weight:700;letter-spacing:.03em;
  border:1px solid transparent;border-radius:var(--radius);cursor:pointer;
  transition:background-color .16s var(--ease-out),color .16s var(--ease-out),border-color .16s var(--ease-out);
}
.btn--solid{background:var(--fx-orange);color:#100B08;border-color:var(--fx-orange)}
.btn--solid:hover{background:var(--fx-orange-soft);border-color:var(--fx-orange-soft)}
.btn--ghost{background:transparent;color:inherit;border-color:currentColor;opacity:.92}
.btn--ghost:hover{color:var(--fx-orange);border-color:var(--fx-orange);opacity:1}

/* ---------- 分类标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  padding:.2rem .5rem;border:1px solid var(--fx-line);border-radius:var(--radius);
  color:var(--fx-grey);white-space:nowrap;
}
.tag--mint{color:var(--fx-mint);border-color:rgba(0,229,168,.45)}
.tag--violet{color:var(--fx-violet-light);border-color:rgba(108,75,255,.55)}
.tag--orange{color:var(--fx-orange);border-color:rgba(255,90,31,.5)}

/* ---------- 档案夹 ---------- */
.file-folder{
  position:relative;padding:1.5rem 1.25rem 1.35rem;
  border:1px solid var(--fx-line);border-radius:var(--radius);
  background:var(--fx-ink-2);color:rgba(247,243,239,.84);
}
.file-folder::before{
  content:"";position:absolute;left:-1px;top:-1px;width:62px;height:7px;
  background:var(--fx-orange);
}
.folder-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin:0 0 .8rem}
.folder-code{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--fx-grey)}
.folder-title{font-size:20px;line-height:1.2;letter-spacing:-.01em;color:var(--fx-white)}
.folder-meta{margin:.55rem 0 0;font-size:13px;color:var(--fx-grey)}

/* ---------- 资料卡 ---------- */
.data-card{
  position:relative;display:flex;flex-direction:column;gap:.5rem;
  padding:1.45rem 1.25rem 1.25rem;
  border:1px solid var(--fx-line);border-radius:var(--radius);
  background:var(--fx-glass);color:rgba(247,243,239,.84);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.data-card--solid{background:var(--fx-ink-2);backdrop-filter:none;-webkit-backdrop-filter:none}
.data-card--light{
  background:var(--fx-white);border-color:rgba(18,14,12,.14);
  color:var(--fx-grey-ink);backdrop-filter:none;-webkit-backdrop-filter:none;
}
.card-tag{
  position:absolute;top:0;left:0;
  border-radius:0 0 var(--radius) 0;
  border-width:0 1px 1px 0;
  background:rgba(18,14,12,.55);
}
.card-index{
  position:absolute;top:.6rem;right:.7rem;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--fx-grey);
}
.card-title{margin:.35rem 0 0;font-size:17px;font-weight:700;line-height:1.3;color:var(--fx-white)}
.card-text{margin:0;font-size:14px;line-height:1.65;color:var(--fx-grey)}
.data-card--light .card-title{color:var(--fx-ink)}
.data-card--light .card-text{color:var(--fx-grey-ink)}

/* ---------- 数据看板 ---------- */
.stat{display:flex;flex-direction:column;gap:.2rem}
.stat-value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(2rem,4.6vw,3.4rem);font-weight:700;line-height:1;letter-spacing:-.03em;
  color:var(--fx-orange);
}
.stat-unit{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;
  color:var(--fx-grey);margin-left:.3em;
}
.stat-label{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--fx-grey)}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--fx-line);border-radius:var(--radius);
  background:
    linear-gradient(140deg,var(--fx-ink-2) 0%,#0B0806 100%);
}
.media-frame::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(115deg,rgba(255,90,31,.16),rgba(255,90,31,0) 58%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--sq{aspect-ratio:1/1}
.media-frame--slant{clip-path:polygon(0 0,100% 0,100% 88%,0 100%)}
.media-frame>img,.media-frame>picture>img{
  display:block;width:100%;height:100%;object-fit:cover;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-block:1.1rem;font-size:12px;letter-spacing:.04em}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem}
.breadcrumb-link{color:var(--fx-grey-ink);border-bottom:1px solid transparent}
.breadcrumb-link:hover{color:var(--fx-orange-deep);border-color:currentColor}
.breadcrumb-sep{font-family:var(--font-mono);color:var(--fx-grey)}
.breadcrumb-item[aria-current="page"]{color:var(--fx-ink);font-weight:600}
.breadcrumb--ink .breadcrumb-link{color:var(--fx-grey)}
.breadcrumb--ink .breadcrumb-link:hover{color:var(--fx-orange-soft)}
.breadcrumb--ink .breadcrumb-item[aria-current="page"]{color:var(--fx-white)}

/* ---------- 章节目录 ---------- */
.toc{padding-block:1rem}
.toc-list{display:flex;flex-direction:column;gap:.2rem;border-left:1px solid var(--fx-line)}
.toc-link{
  display:block;margin-left:-1px;padding:.32rem .8rem;
  font-size:13px;color:var(--fx-grey-ink);
  border-left:2px solid transparent;
  transition:color .16s var(--ease-out),border-color .16s var(--ease-out);
}
.toc-link:hover{color:var(--fx-orange-deep)}
.toc-link[aria-current="true"]{color:var(--fx-ink);border-left-color:var(--fx-orange);font-weight:700}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .22s ease-out,transform .22s ease-out;
}
[data-reveal][data-revealed="true"]{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--fx-ink);
  color:rgba(247,243,239,.82);
  padding:clamp(3rem,6vw,5rem) 0 2rem;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--fx-orange) 0%,var(--fx-orange-soft) 38%,rgba(255,90,31,0) 78%);
  transform:skewY(-1.2deg);transform-origin:left center;
}
.site-footer::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,var(--fx-line-soft) 1px,transparent 1px);
  background-size:88px 100%;
  opacity:.5;
}
.footer-glow{
  position:absolute;right:-8%;bottom:-32%;width:min(620px,90vw);height:min(620px,90vw);
  background:radial-gradient(circle,rgba(255,90,31,.26) 0%,rgba(255,90,31,0) 62%);
  pointer-events:none;
  animation:footerGlow 6s ease-in-out infinite alternate;
}
@keyframes footerGlow{
  from{transform:translate3d(0,0,0);opacity:.65}
  to{transform:translate3d(-42px,-26px,0);opacity:1}
}
.footer-shell{
  position:relative;z-index:1;
  width:min(100% - 2.5rem,var(--shell));margin-inline:auto;
}
.footer-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:1.25rem 2rem;padding-bottom:1.75rem;
  border-bottom:1px solid var(--fx-line);
}
.footer-brand{display:inline-flex;align-items:center;gap:.8rem;color:var(--fx-white)}
.footer-closing{
  margin:0;max-width:36ch;font-size:13px;letter-spacing:.02em;color:var(--fx-grey);
}
.footer-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:2rem;padding-block:2.5rem;
  border-bottom:1px solid var(--fx-line);
}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 .9rem;
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;color:var(--fx-orange);
}
.footer-list{display:flex;flex-direction:column;gap:.55rem}
.footer-link{
  font-size:14px;color:rgba(247,243,239,.74);
  transition:color .16s var(--ease-out);
}
.footer-link:hover{color:var(--fx-orange-soft)}
.footer-link:focus-visible{outline:2px solid var(--fx-mint);outline-offset:3px}
.footer-contact{display:flex;flex-direction:column;gap:.4rem}
.footer-contact-value{
  font-family:var(--font-mono);font-size:13px;line-height:1.5;
  color:var(--fx-white);word-break:break-word;
}
.footer-contact-note{margin:.45rem 0 0;font-size:12px;line-height:1.6;color:var(--fx-grey)}
.footer-legal{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:.75rem 1.5rem;
  padding-top:1.5rem;font-size:12px;letter-spacing:.04em;color:var(--fx-grey);
}
.footer-legal-line{margin:0}
.footer-legal-meta{margin:0;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em}

/* ---------- 平板 ---------- */
@media (max-width:1023px){
  :root{--announce-h:34px;--header-bar:132px}
  .header-inner{flex-wrap:wrap;row-gap:10px;gap:.75rem;padding-block:12px}
  .brand{order:1}
  .nav-toggle{order:2;display:inline-flex;margin-left:auto}
  .entry-matrix{
    order:3;width:100%;display:flex;
    overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;
  }
  .entry-matrix::-webkit-scrollbar{display:none}
  .entry-cell{flex:0 0 auto;min-width:154px}
  .site-nav{
    order:4;display:none;width:100%;margin-left:0;
    flex-direction:column;align-items:stretch;
  }
  .site-nav[data-open="true"]{
    display:flex;
    max-height:min(70vh,520px);overflow-y:auto;
    padding-block:.35rem 1rem;
  }
  .site-header[data-nav-open="true"] .header-shell{background:var(--fx-ink)}
  .nav-list{flex-direction:column;align-items:stretch;width:100%}
  .nav-link{
    display:block;padding:.8rem .25rem;font-size:15px;
    border-bottom:1px solid var(--fx-line);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{
    color:var(--fx-orange);
    border-left:2px solid var(--fx-orange);
    padding-left:.8rem;
  }
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  :root{--header-bar:138px}
  body{font-size:15px}
  .container,.footer-shell{width:min(100% - 1.75rem,var(--shell))}
  .announce-inner{width:min(100% - 1.25rem,var(--shell))}
  .header-inner{width:min(100% - 1.25rem,var(--shell))}
  .brand-sub{display:none}
  .brand-name{font-size:16px}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:1.75rem}
  .footer-head{flex-direction:column;align-items:flex-start}
  .footer-legal{flex-direction:column}
  .btn{width:100%}
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .footer-glow{animation:none;opacity:.85}
  [data-reveal]{opacity:1;transform:none}
}