:root{
  --ink-950:#0A1020;
  --ink-850:#111C31;
  --ink-800:#16233C;
  --ink-700:#1E2C48;
  --cyan-400:#2FE3D0;
  --cyan-700:#118F87;
  --neon-500:#FF7A33;
  --paper-100:#F3E9D6;
  --paper-300:#D9C9A6;
  --text-100:#E9EFF8;
  --text-400:#98A9C0;
  --ink-on-paper:#2A2419;
  --ok-400:#6EE7A8;

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --font-archive:Georgia,"Songti SC","SimSun","Noto Serif SC",serif;

  --r-lg:28px;
  --r-md:18px;
  --r-sm:12px;
  --r-pill:999px;

  --shell:1180px;
  --gutter:clamp(18px,4vw,40px);
  --gap-sm:8px;
  --gap:16px;
  --gap-lg:28px;
  --gap-xl:48px;
  --header-h:64px;

  --ease:cubic-bezier(.22,.7,.3,1);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}

body{
  margin:0;
  background:var(--ink-950);
  color:var(--text-100);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,svg,video{display:block;max-width:100%;height:auto}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:700;line-height:1.2;letter-spacing:.04em}
p{margin:0}
hr{border:0;border-top:1px solid var(--ink-700);margin:0}

:focus-visible{
  outline:2px solid var(--cyan-400);
  outline-offset:3px;
  border-radius:8px;
}

/* ---------- 工具类 ---------- */
.mono{font-family:var(--font-mono);font-weight:400;letter-spacing:.08em}
.annot{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.3em;
  color:var(--text-400);
}
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
}

/* ---------- 跳至主内容 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-72px;
  z-index:200;
  padding:10px 20px;
  border-radius:var(--r-pill);
  background:var(--cyan-400);
  color:#04131A;
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(10,16,32,.93);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--ink-700);
  transition:box-shadow .2s var(--ease),background-color .2s var(--ease);
}
.site-header::before{
  content:"";
  position:absolute;
  left:0;right:0;top:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan-400),var(--cyan-700) 42%,rgba(17,143,135,.15) 70%,var(--neon-500));
}
.site-header[data-condensed]{
  background:rgba(8,13,26,.98);
  box-shadow:0 14px 34px rgba(4,8,18,.5);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:var(--header-h);
  padding-top:6px;
  padding-bottom:6px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  padding:6px 0;
  flex:0 0 auto;
}
.brand-mark{
  position:relative;
  width:28px;height:28px;
  border-radius:10px;
  background:linear-gradient(140deg,var(--cyan-400),var(--cyan-700));
  box-shadow:0 0 0 1px var(--ink-700),0 0 18px rgba(47,227,208,.18);
  flex:0 0 auto;
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:8px;
  border-radius:4px;
  background:var(--ink-950);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--text-100);
  transition:color .16s var(--ease);
}
.brand-tag{font-size:11px;letter-spacing:.14em;color:var(--text-400)}
.brand:hover .brand-name{color:var(--cyan-400)}
.brand--footer .brand-name{font-size:22px}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 16px;
  border:1px solid var(--ink-700);
  border-radius:var(--r-pill);
  background:var(--ink-850);
  color:var(--text-100);
  font-size:13px;
  letter-spacing:.1em;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.nav-toggle-text{font-family:var(--font-mono);font-size:12px}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bar{
  height:2px;
  border-radius:2px;
  background:var(--cyan-400);
  transition:transform .18s var(--ease),opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:22px}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:flex}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 13px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:15px;
  color:var(--text-400);
  white-space:nowrap;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.nav-index{font-size:10px;letter-spacing:.1em;color:var(--cyan-700);transition:color .16s var(--ease)}
.nav-link:hover{
  color:var(--text-100);
  border-color:var(--ink-700);
  background:var(--ink-850);
}
.nav-link:hover .nav-index{color:var(--cyan-400)}
.nav-link[aria-current="page"]{
  color:#04131A;
  background:var(--cyan-400);
  border-color:var(--cyan-400);
  font-weight:600;
}
.nav-link[aria-current="page"] .nav-index{color:#0A4A46}

.nav-rail{
  display:flex;
  align-items:center;
  gap:14px;
  padding-left:22px;
  border-left:1px solid var(--ink-700);
}
.nav-note{font-size:11px;letter-spacing:.12em;color:var(--text-400);white-space:nowrap}

.header-strip{
  border-top:1px solid var(--ink-700);
  background:linear-gradient(90deg,rgba(17,28,49,.95),rgba(10,16,32,.95));
}
.strip-inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:41px;
  overflow-x:auto;
  scrollbar-width:none;
}
.strip-inner::-webkit-scrollbar{display:none}
.strip-label{font-size:11px;letter-spacing:.18em;color:var(--text-400);white-space:nowrap}
.quick-chips{display:flex;align-items:center;gap:8px}
.chip{
  display:inline-block;
  padding:4px 13px;
  border:1px dashed var(--ink-700);
  border-radius:var(--r-pill);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--text-400);
  white-space:nowrap;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.chip:hover{
  color:var(--cyan-400);
  border-color:var(--cyan-400);
  border-style:solid;
  background:rgba(47,227,208,.07);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 21px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  text-align:center;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .06s linear;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--cyan-400);color:#04131A}
.btn-primary:hover{background:var(--neon-500);color:#1A0D04}
.btn-ghost{background:transparent;color:var(--text-100);border-color:var(--ink-700)}
.btn-ghost:hover{border-color:var(--cyan-400);color:var(--cyan-400);background:var(--ink-850)}
.btn-paper{background:var(--paper-300);color:var(--ink-on-paper)}
.btn-paper:hover{background:var(--paper-100)}
.btn-sm{padding:7px 15px;font-size:13px}

/* ---------- 面包屑 ---------- */
.breadcrumbs{padding:18px 0 0}
.crumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--text-400);
}
.crumb-link{color:var(--text-400);transition:color .16s var(--ease)}
.crumb-link:hover{color:var(--cyan-400)}
.crumb-sep{color:var(--ink-700)}
.crumb-current{color:var(--text-100)}

/* ---------- 正文与章节 ---------- */
.section{padding:clamp(40px,7vw,80px) 0}
.section--tight{padding:clamp(24px,4vw,42px) 0}
.section-head{
  display:flex;
  flex-direction:column;
  gap:12px;
  max-width:64ch;
  margin-bottom:28px;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--cyan-400);
}
.section-title{font-size:clamp(24px,3.4vw,34px)}
.section-lead{font-size:16px;line-height:1.8;color:var(--text-400)}
.prose{max-width:70ch;font-size:16px;line-height:1.85;color:var(--text-100)}
.prose p+p{margin-top:14px}
.prose h3{font-size:20px;margin:26px 0 10px}
.prose strong{color:var(--cyan-400);font-weight:600}

/* ---------- 面板 / 卡片 / 网格 ---------- */
.panel{
  border:1px solid var(--ink-700);
  border-radius:var(--r-lg);
  background:linear-gradient(160deg,var(--ink-850),#0E1829);
  padding:clamp(20px,3vw,32px);
  transition:border-color .16s var(--ease),transform .16s var(--ease);
}
.panel:hover{border-color:var(--cyan-400)}
.panel-head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:16px;
}
.panel-body{font-size:15px;line-height:1.8;color:var(--text-400)}
.card{
  border:1px solid var(--ink-700);
  border-radius:var(--r-md);
  background:var(--ink-850);
  padding:18px 20px;
  transition:border-color .16s var(--ease),background-color .16s var(--ease);
}
.card:hover{border-color:var(--cyan-400)}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
[data-filter-item][hidden]{display:none}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 11px;
  border:1px solid var(--ink-700);
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--text-400);
}
.tag--cyan{border-color:var(--cyan-700);color:var(--cyan-400)}
.tag--neon{border-color:var(--neon-500);color:var(--neon-500)}
.tag--paper{border-color:var(--paper-300);background:var(--paper-100);color:var(--ink-on-paper)}

/* ---------- 归位线 ---------- */
.homing-line{
  position:relative;
  height:2px;
  margin:var(--gap-lg) 0;
  border-radius:2px;
  background:linear-gradient(90deg,var(--cyan-400),var(--cyan-700) 55%,rgba(47,227,208,.12));
}
.homing-dot{
  position:absolute;
  right:0;
  top:50%;
  width:10px;height:10px;
  margin-top:-5px;
  border-radius:50%;
  background:var(--cyan-400);
  box-shadow:0 0 0 6px rgba(47,227,208,.14);
  animation:pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{
  0%,100%{opacity:.45;transform:scale(.86)}
  50%{opacity:1;transform:scale(1)}
}

/* ---------- 筛选条 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  padding:7px 17px;
  border:1px solid var(--ink-700);
  border-radius:var(--r-pill);
  background:var(--ink-850);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--text-400);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.filter-btn:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.filter-btn[aria-pressed="true"]{
  background:var(--cyan-400);
  border-color:var(--cyan-400);
  color:#04131A;
  font-weight:600;
}

/* ---------- 图片容器基类 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--ink-700);
  border-radius:var(--r-lg);
  background:
    linear-gradient(150deg,var(--ink-850),#0C1526),
    repeating-linear-gradient(90deg,rgba(47,227,208,.06) 0 1px,transparent 1px 22px);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(47,227,208,.10),transparent 46%,rgba(10,16,32,.45));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--paper{
  border-color:var(--paper-300);
  background:linear-gradient(160deg,var(--paper-100),var(--paper-300));
}
.media-frame--paper::after{background:linear-gradient(180deg,rgba(42,36,25,.06),rgba(42,36,25,.16))}

/* ---------- 旧档纸面区 ---------- */
.paper-zone{
  position:relative;
  border-radius:var(--r-lg);
  background:linear-gradient(170deg,var(--paper-100),#EADFC7 62%,var(--paper-300));
  color:var(--ink-on-paper);
  padding:clamp(24px,4vw,48px);
  box-shadow:0 22px 48px rgba(4,8,18,.42);
}
.paper-zone::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(42,36,25,.05) 0 1px,transparent 1px 28px);
}
.paper-zone h2,
.paper-zone h3{font-family:var(--font-archive);letter-spacing:.01em}
.archive-note{
  font-family:var(--font-archive);
  font-size:19px;
  line-height:1.75;
  color:var(--ink-on-paper);
}

/* ---------- 滚动进度线 ---------- */
.scroll-progress{
  position:fixed;
  left:0;top:0;
  z-index:120;
  height:2px;
  width:0;
  pointer-events:none;
  background:linear-gradient(90deg,var(--cyan-400),var(--neon-500));
}

/* ---------- 显现动画（由 JS 添加 .js-reveal 后生效） ---------- */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js-reveal [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,88px);
  background:linear-gradient(180deg,var(--ink-950),#070C18);
  border-top:1px solid var(--ink-700);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(280px,1.05fr) minmax(320px,1.35fr);
  gap:40px;
  padding:clamp(32px,5vw,56px) 0 34px;
}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.footer-blurb{max-width:36em;font-size:14px;line-height:1.8;color:var(--text-400)}
.footer-status{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--ok-400);
}
.status-dot{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--ok-400);
  box-shadow:0 0 0 4px rgba(110,231,168,.14);
}
.footer-cta{
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:clamp(20px,3vw,28px);
  border:1px solid var(--ink-700);
  border-radius:var(--r-lg);
  background:linear-gradient(160deg,var(--ink-850),#0E1829);
}
.footer-cta-title{font-size:20px}
.footer-cta-text{font-size:14px;line-height:1.75;color:var(--text-400)}
.footer-cta-actions{display:flex;flex-wrap:wrap;gap:10px}
.footer-facts{display:grid;gap:8px;margin-top:4px}
.fact{display:flex;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--text-400)}
.fact-key{
  flex:0 0 auto;
  min-width:44px;
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cyan-400);
}
.fact-value{color:var(--text-100)}

.footer-columns{
  display:grid;
  grid-template-columns:1.35fr 1fr 1.5fr .8fr;
  gap:32px;
  padding:34px 0 10px;
  border-top:1px solid var(--ink-700);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--cyan-400);
}
.tile-wall{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.tile{
  display:flex;
  flex-direction:column;
  gap:3px;
  padding:12px 14px;
  border:1px solid var(--ink-700);
  border-radius:var(--r-md);
  background:var(--ink-850);
  transition:border-color .16s var(--ease),background-color .16s var(--ease),transform .06s linear;
}
.tile:hover{border-color:var(--cyan-400);background:#132038}
.tile:active{transform:translateY(1px);background:rgba(47,227,208,.14)}
.tile-label{font-size:14px;line-height:1.4;color:var(--text-100)}
.tile-meta{font-size:10px;letter-spacing:.08em;color:var(--text-400)}
.tile:hover .tile-meta{color:var(--cyan-400)}

.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  font-size:14px;
  color:var(--text-400);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-link:hover{color:var(--cyan-400);border-bottom-color:var(--cyan-700)}
.footer-text{font-size:13px;line-height:1.75;color:var(--text-400)}
.footer-text--mono{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--text-100);
  word-break:break-all;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:30px;
  padding:22px 0 40px;
  border-top:1px solid var(--ink-700);
  font-size:12px;
  color:var(--text-400);
}
.footer-legal{font-family:var(--font-mono);letter-spacing:.06em}
.footer-note{max-width:54ch;line-height:1.7}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .nav-link{padding:8px 10px;font-size:14px}
  .nav-rail{padding-left:16px;gap:10px}
  .nav-note{display:none}
}

/* ---------- 移动 ---------- */
@media (max-width:960px){
  html{scroll-padding-top:78px}
  .header-inner{padding-top:8px;padding-bottom:8px}
  .site-header[data-condensed] .header-inner{min-height:var(--header-h)}
  .header-strip{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;
    left:0;right:0;
    top:var(--header-h);
    bottom:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:20px;
    padding:22px var(--gutter) 40px;
    background:linear-gradient(180deg,var(--ink-850),var(--ink-950));
    border-top:1px solid var(--ink-700);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s linear;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  body.nav-open{overflow:hidden}

  .nav-list{flex-direction:column;align-items:stretch;gap:8px}
  .nav-link{
    justify-content:flex-start;
    padding:14px 16px;
    font-size:17px;
    border-color:var(--ink-700);
    border-radius:var(--r-md);
    background:var(--ink-850);
  }
  .nav-link[aria-current="page"]{border-color:var(--cyan-400)}
  .nav-index{font-size:11px}
  .nav-rail{
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    padding:18px 0 0;
    border-left:0;
    border-top:1px solid var(--ink-700);
  }
  .nav-note{display:block}
  .nav-rail .btn{width:100%}
}

/* ---------- 窄屏 ---------- */
@media (max-width:640px){
  body{font-size:15px;line-height:1.7}
  .brand-name{font-size:18px}
  .brand--footer .brand-name{font-size:20px}
  .footer-columns{grid-template-columns:1fr;gap:26px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-cta-actions .btn{width:100%}
  .tile-wall{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:420px){
  .brand-tag{display:none}
  .tile-wall{grid-template-columns:1fr}
}

/* ---------- 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;
    scroll-behavior:auto !important;
  }
  .js-reveal [data-reveal]{opacity:1;transform:none}
}