@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Space+Grotesk:wght@500;600;700&display=swap');

:root{
  --paper:#fafaf8;
  --graphite:#4a4a4a;
  --ink:#1a1a1a;
  --rule:rgba(26,26,26,.20);
  --tape:rgba(26,26,26,.055);
  --display:"Space Grotesk",Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}

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

html{
  background:var(--paper);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  padding-bottom:104px;
  background:var(--paper);
  color:var(--ink);
  font-family:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:60;
  pointer-events:none;
  opacity:.22;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
}

img,svg{max-width:100%}
img{filter:grayscale(1) contrast(1.06)}

a{color:var(--ink)}
a:focus-visible,button:focus-visible{outline:2px dashed var(--ink);outline-offset:3px}

section[id]{scroll-margin-top:26px}

/* ---------- 顶部满屏区 ---------- */

.hero{
  min-height:100svh;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  align-items:center;
  gap:clamp(20px,4vw,56px);
  padding:clamp(26px,6vh,64px) clamp(16px,5vw,64px) clamp(56px,9vh,84px);
  border-bottom:1.5px solid var(--ink);
}

.hero-fig{
  margin:0;
  padding:10px 10px 6px;
  background:#fff;
  border:1.5px solid var(--ink);
  border-radius:10px 14px 9px 12px / 12px 9px 14px 10px;
  box-shadow:8px 8px 0 rgba(26,26,26,.11);
}

.hero-img{display:block;width:100%;height:auto;border-radius:6px}

.hero-empty{
  aspect-ratio:4/3;
  border-radius:6px;
  background:
    repeating-linear-gradient(115deg,var(--tape) 0 2px,transparent 2px 9px),
    #f2f1ee;
}

.hero-fig figcaption{
  margin-top:8px;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--graphite);
}

.hero-copy{text-align:right}

.kicker{
  margin:0 0 10px;
  font-size:12.5px;
  letter-spacing:.24em;
  color:var(--graphite);
  font-weight:500;
}

h1{
  margin:0 0 14px;
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2rem,5.6vw,3.9rem);
  line-height:1.06;
  letter-spacing:-.03em;
}

.lede{
  margin:0 0 20px auto;
  max-width:34ch;
  color:var(--graphite);
  font-size:17px;
}

.hero-cta{margin:0}

/* ---------- 按钮 ---------- */

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 20px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.04em;
  text-decoration:none;
  color:var(--paper);
  background:var(--ink);
  border:1.5px solid var(--ink);
  border-radius:10px;
  transition:transform .1s linear, background .1s linear;
}

.btn:hover{background:transparent;color:var(--ink);transform:rotate(-1deg)}
.btn--ghost{background:transparent;color:var(--ink)}
.btn--ghost:hover{background:var(--ink);color:var(--paper)}

/* ---------- 主栅格 ---------- */

.wrap{
  max-width:1140px;
  margin:0 auto;
  padding:clamp(24px,4vw,52px) clamp(14px,4vw,40px) 40px;
  display:grid;
  grid-template-columns:208px minmax(0,1fr);
  gap:clamp(18px,3vw,44px);
  align-items:start;
}

/* ---------- 左侧边栏 ---------- */

.side{
  position:sticky;
  top:24px;
  padding:14px;
  background:#fff;
  border:1.5px solid var(--ink);
  border-radius:9px 13px 10px 12px / 12px 10px 13px 9px;
  box-shadow:4px 4px 0 rgba(26,26,26,.10);
  transform:rotate(.5deg);
  font-size:14px;
}

.side h2{
  margin:0;
  font-family:var(--display);
  font-size:14px;
  letter-spacing:.14em;
  font-weight:600;
}

.side hr{
  border:0;
  border-top:1.5px solid var(--ink);
  margin:8px 0 12px;
}

.toc{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:toc;
}

.toc li{margin:0 0 1px}

.toc a{
  display:flex;
  align-items:center;
  gap:7px;
  min-height:36px;
  padding:0 3px;
  color:var(--graphite);
  text-decoration:none;
  border-bottom:1px dashed transparent;
}

.toc a::before{
  counter-increment:toc;
  content:counter(toc,decimal-leading-zero);
  font-family:var(--mono);
  font-size:11px;
  color:var(--graphite);
}

.toc a:hover{color:var(--ink);border-bottom-color:var(--ink)}

.sticker{
  margin-top:16px;
  padding:8px 9px;
  border:1px dashed var(--ink);
  border-radius:3px;
  background:var(--tape);
  transform:rotate(-1.6deg);
  font-size:12.5px;
  letter-spacing:.14em;
  color:var(--graphite);
}

.sticker-line{display:block}
.sticker-line:not(.is-on){display:none}

/* ---------- 正文 ---------- */

.stage{min-width:0}

.paper{
  padding:clamp(18px,3vw,38px);
  background:#fff;
  border:1.5px solid var(--ink);
  border-radius:10px;
  box-shadow:7px 7px 0 rgba(26,26,26,.10);
}

.paper > section{margin:0}
.paper > section + section{
  margin-top:36px;
  padding-top:28px;
  border-top:1.5px dashed var(--rule);
}

.paper h2{
  margin:0 0 10px;
  font-family:var(--display);
  font-size:clamp(1.4rem,2.8vw,1.95rem);
  line-height:1.22;
  letter-spacing:-.02em;
  font-weight:700;
}

.paper h3{
  margin:24px 0 8px;
  font-family:var(--display);
  font-size:1.12rem;
  line-height:1.35;
  letter-spacing:-.01em;
}

.paper hr{
  border:0;
  border-top:2px solid var(--ink);
  width:56px;
  margin:12px 0 18px;
}

.paper h2 + hr,.paper h3 + hr{margin:0 0 18px}

.paper p{margin:0 0 16px}
.paper ul,.paper ol{margin:0 0 18px;padding-left:1.3em}
.paper li{margin:0 0 8px}

.paper strong{background:var(--tape);padding:0 2px}

.paper blockquote{
  margin:20px 0;
  padding:12px 16px;
  border-left:3px solid var(--ink);
  background:rgba(26,26,26,.035);
  color:var(--graphite);
}

.paper img{
  display:block;
  height:auto;
  margin:16px 0;
  border:1.5px solid var(--ink);
  border-radius:8px;
}

.paper table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 18px;
  font-size:15.5px;
}

.paper th,.paper td{
  border:1px solid var(--rule);
  padding:8px 10px;
  text-align:left;
}

.paper th{background:var(--tape);font-weight:600}

/* ---------- 页脚 ---------- */

.foot{
  margin-top:24px;
  padding:clamp(28px,5vw,56px) clamp(14px,4vw,40px) 28px;
  border-top:1.5px solid var(--ink);
  background:var(--paper);
}

.cta-block{
  max-width:1140px;
  margin:0 auto clamp(28px,5vw,48px);
  padding:clamp(20px,3vw,34px);
  text-align:center;
  border:1.5px dashed var(--ink);
  border-radius:10px;
  background:rgba(26,26,26,.03);
  transform:rotate(-.35deg);
}

.cta-block h2{
  margin:0;
  font-family:var(--display);
  font-size:clamp(1.35rem,3vw,1.9rem);
  line-height:1.25;
  letter-spacing:-.02em;
}

.cta-block hr{
  border:0;
  border-top:2px solid var(--ink);
  width:64px;
  margin:14px auto 16px;
}

.cta-block p{margin:0 0 10px;color:var(--graphite);font-size:15.5px}
.cta-line{margin-top:16px}

.foot-cols{
  max-width:1140px;
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:clamp(16px,3vw,36px);
}

.foot-col h3{
  margin:0 0 10px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--graphite);
}

.foot address{
  font-style:normal;
  font-size:14.5px;
  line-height:1.8;
  color:var(--graphite);
}

.foot nav dl{margin:0}
.foot nav dt{
  margin:0 0 10px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--graphite);
}

.foot nav dd{margin:0}

.foot nav a,.foot ul a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 2px;
  font-size:15px;
  text-decoration:none;
  border-bottom:1px solid transparent;
}

.foot nav a:hover,.foot ul a:hover{border-bottom-color:var(--ink)}

.foot ul{list-style:none;margin:0;padding:0}
.foot ul li{margin:0}

.foot-kw{font-size:14px;line-height:1.9;color:var(--graphite);margin:0}

.copy{
  max-width:1140px;
  margin:clamp(24px,4vw,40px) auto 0;
  padding-top:14px;
  border-top:1px dashed var(--rule);
  text-align:center;
  font-size:13px;
  color:var(--graphite);
}

/* ---------- 底部固定条 ---------- */

.bar{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:50;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:14px;
  padding:10px clamp(12px,3vw,32px);
  background:var(--paper);
  border-top:1.5px solid var(--ink);
  box-shadow:0 -6px 0 rgba(26,26,26,.06);
}

.bar-side{display:flex;align-items:center;gap:3px;min-width:0}
.bar-side--l{justify-content:flex-start}
.bar-side--r{justify-content:flex-end}

.bar-side a,.grp{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 9px;
  font-family:inherit;
  font-size:14.5px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--graphite);
  background:transparent;
  border:0;
  border-radius:8px;
  text-decoration:none;
  cursor:pointer;
  transition:none;
}

.bar-side a:hover,.grp:hover{color:var(--ink);background:var(--tape)}

.grp::after{content:"▾";margin-left:5px;font-size:11px;color:var(--graphite)}

.brand{
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:40px;
  padding:0 6px;
  font-family:var(--display);
  font-weight:700;
  font-size:16px;
  letter-spacing:-.01em;
  text-decoration:none;
  color:var(--ink);
  white-space:nowrap;
}

.brand-mark{width:22px;height:22px;object-fit:contain}

.bar-cta{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  margin-left:6px;
  padding:0 14px;
  font-size:14.5px;
  font-weight:600;
  text-decoration:none;
  color:var(--paper);
  background:var(--ink);
  border-radius:10px;
  transform:rotate(-1deg);
}

.bar-cta:hover{background:var(--graphite);color:var(--paper)}

.menu-group{position:relative;display:flex}

.dd{
  position:absolute;
  left:50%;
  bottom:calc(100% + 10px);
  transform:translateX(-50%) translateY(6px);
  display:flex;
  flex-direction:column;
  min-width:172px;
  padding:8px;
  gap:1px;
  background:var(--paper);
  border:1.5px solid var(--ink);
  border-radius:10px;
  box-shadow:5px 5px 0 rgba(26,26,26,.14);
  opacity:0;
  visibility:hidden;
  transition:opacity .12s linear, transform .12s linear;
}

.menu-group:hover .dd,
.menu-group:focus-within .dd{
  opacity:1;
  visibility:visible;
  transform:translateX(-50%) translateY(0);
}

.dd a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:0 10px;
  border-radius:7px;
  color:var(--ink);
  text-decoration:none;
  font-size:14.5px;
}

.dd a:hover{background:var(--tape)}

/* ---------- 入场上场 ---------- */

.rv{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .34s linear, transform .34s linear;
}

.rv.on{opacity:1;transform:none}

/* ---------- 断点 ---------- */

@media (max-width:900px){
  .wrap{grid-template-columns:1fr}
  .side{position:static;transform:none}
  .toc{display:grid;grid-template-columns:1fr 1fr;column-gap:10px}
}

@media (max-width:760px){
  body{padding-bottom:132px;font-size:16.5px}

  .hero{
    grid-template-columns:1fr;
    align-items:center;
    gap:16px;
    padding:20px 16px 40px;
  }

  .hero-fig{max-height:36svh;overflow:hidden}
  .hero-fig figcaption{font-size:10.5px}
  h1{font-size:clamp(1.85rem,8.6vw,2.6rem)}
  .lede{font-size:16px}

  .paper{padding:16px}
  .paper > section + section{margin-top:28px;padding-top:22px}

  .foot-cols{grid-template-columns:repeat(2,1fr)}
  .toc{grid-template-columns:1fr}

  .bar{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:1px 1px;
    padding:6px 8px calc(6px + env(safe-area-inset-bottom));
  }

  .bar-side{display:contents}

  .brand{
    order:-1;
    flex:0 0 100%;
    justify-content:center;
    min-height:34px;
    margin-bottom:4px;
    padding-bottom:5px;
    border-bottom:1px dashed var(--rule);
    font-size:14.5px;
  }

  .bar-side a,.grp{font-size:12.5px;min-height:44px;padding:0 7px}
  .bar-cta{font-size:12.5px;min-height:44px;padding:0 10px;margin-left:3px}

  .dd{
    position:absolute;
    left:50%;
    bottom:calc(100% + 8px);
    transform:translateX(-50%) translateY(6px);
  }
}

@media (max-width:420px){
  .foot-cols{grid-template-columns:1fr}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .bar-cta,.cta-block,.side,.sticker{transform:none}
  .btn{transition:none}
}
</｜DSML｜ parameter>
</｜DSML｜ invoke>
</｜DSML｜ calls>

button[aria-expanded]{min-width:44px;min-height:44px}