:root{
  --ink:#1f1f1f;
  --ink-2:#3f3f3f;
  --mute:#77787b;
  --paper:#ffffff;
  --mist:#f5f5f5;
  --line:#e7e7e9;
  --r:28px;
  --r-sm:16px;
  --shadow:0 4px 6px rgba(0,0,0,.05), 0 22px 48px -28px rgba(0,0,0,.28);
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",monospace;
}
*{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
}
body{
  margin:0;
  background:var(--mist);
  color:var(--ink);
  font-family:var(--mono);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.005em;
  padding-bottom:104px;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3,h4{font-weight:500;letter-spacing:-.012em}
p{margin:0 0 1em}
[id]{scroll-margin-top:92px}

.wrap{
  width:100%;
  max-width:1160px;
  margin:0 auto;
  padding:0 clamp(14px,3vw,28px);
}

/* ---------- 角落品牌图标 ---------- */
.mark{
  position:fixed;
  top:14px;
  left:14px;
  z-index:60;
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  border-radius:var(--r-sm);
  background:var(--paper);
  border:1px solid var(--line);
  box-shadow:0 6px 18px -10px rgba(0,0,0,.35);
  text-decoration:none;
  overflow:hidden;
  transition:transform .22s ease;
}
.mark:hover{transform:translateY(-2px)}
.mark-i{width:26px;height:26px;object-fit:contain}
.mark-ch{font-size:1.05rem;font-weight:500}

/* ---------- 首屏 ---------- */
.hero{
  min-height:100vh;
  min-height:100svh;
  display:grid;
  grid-template-columns:minmax(0,1.18fr) minmax(0,.82fr);
  align-items:center;
  gap:clamp(10px,1.6vw,18px);
  padding:clamp(82px,11vh,116px) 0 clamp(20px,4vh,40px);
}
.hero-in{
  position:relative;
  overflow:hidden;
  background:var(--paper);
  border-radius:var(--r);
  padding:clamp(24px,4vw,46px);
  box-shadow:var(--shadow);
}
.hero-num{
  position:absolute;
  right:-.07em;
  bottom:-.28em;
  font-size:clamp(120px,25vw,320px);
  line-height:.78;
  font-weight:500;
  letter-spacing:-.08em;
  color:rgba(31,31,31,.045);
  pointer-events:none;
  user-select:none;
}
.hero-in h1{
  position:relative;
  margin:0 0 16px;
  font-size:clamp(28px,4.6vw,52px);
  line-height:1.24;
}
.hero-sub{
  position:relative;
  max-width:40ch;
  margin:0 0 22px;
  color:var(--ink-2);
}
.hero-cue{margin:0;position:relative}
.hero-cue a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:9px 20px;
  border-radius:999px;
  background:var(--ink);
  color:#fff;
  text-decoration:none;
  transition:transform .2s ease,opacity .2s ease;
}
.hero-cue a:hover{transform:translateY(-2px);opacity:.92}
.hero-card{
  border-radius:var(--r);
  background:linear-gradient(155deg,#ffffff 0%,#ececee 100%);
  box-shadow:var(--shadow);
  overflow:hidden;
  min-height:min(58vh,430px);
  display:grid;
  place-items:center;
}
.hero-shot{width:100%;height:100%;min-height:min(58vh,430px);object-fit:cover}

/* ---------- 主体网格 ---------- */
.board{
  display:grid;
  grid-template-columns:minmax(0,1fr) 294px;
  align-items:start;
  gap:clamp(10px,1.6vw,18px);
  padding-bottom:34px;
}
.prose{min-width:0}
.prose > section,
.prose > div{
  background:var(--paper);
  border-radius:var(--r);
  padding:clamp(20px,3.2vw,38px);
  box-shadow:var(--shadow);
  margin-bottom:clamp(10px,1.6vw,18px);
}
.prose > section:last-child,
.prose > div:last-child{margin-bottom:0}

.prose small{
  display:block;
  font-size:1rem;
  line-height:1.5;
  letter-spacing:.08em;
  color:var(--mute);
  margin-bottom:.35em;
}
.prose h2{
  font-size:clamp(20px,2.6vw,29px);
  line-height:1.34;
  margin:0 0 .65em;
}
.prose h3{
  font-size:clamp(17px,2vw,21px);
  line-height:1.4;
  margin:1.5em 0 .5em;
}
.prose h2 + h3{margin-top:.2em}
.prose p{color:var(--ink-2);line-height:1.85}
.prose ul,.prose ol{padding-left:1.25em;color:var(--ink-2)}
.prose li{margin:.35em 0;line-height:1.8}
.prose li::marker{color:var(--mute)}
.prose a{
  color:var(--ink);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
  text-decoration-color:#c7c7cb;
  transition:text-decoration-color .2s ease;
}
.prose a:hover{text-decoration-color:var(--ink)}
.prose blockquote{
  margin:1.2em 0;
  padding:2px 0 2px 16px;
  border-left:2px solid var(--ink);
  color:var(--ink);
}
.prose blockquote p{margin:0;color:var(--ink)}
.prose figure{margin:1.2em 0}
.prose figure img{border-radius:var(--r-sm);box-shadow:var(--shadow)}
.prose figcaption{font-size:1rem;color:var(--mute);margin-top:.5em}
.prose table{
  width:100%;
  border-collapse:collapse;
  display:block;
  overflow-x:auto;
  font-size:1rem;
  margin:1.2em 0;
}
.prose th,.prose td{
  border-bottom:1px solid var(--line);
  padding:10px 12px;
  text-align:left;
  white-space:nowrap;
}
.prose th{font-weight:500;background:var(--mist)}
.prose code{
  background:var(--mist);
  border-radius:8px;
  padding:.12em .38em;
  font-size:.95em;
}
.prose hr{border:0;border-top:1px solid var(--line);margin:1.6em 0}

/* ---------- 右侧目录 ---------- */
.rail{
  position:sticky;
  top:86px;
  background:var(--paper);
  border-radius:var(--r);
  padding:20px 18px 18px;
  box-shadow:var(--shadow);
}
.rail small{
  display:block;
  font-size:1rem;
  letter-spacing:.08em;
  color:var(--mute);
  margin-bottom:.2em;
}
.rail h2{font-size:1.06rem;margin:0 0 .5em}
.rail ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 10px;
  border-radius:var(--r-sm);
  text-decoration:none;
  color:var(--ink-2);
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.rail a:hover{background:var(--mist);color:var(--ink);transform:translateX(2px)}

/* ---------- 页脚 ---------- */
.foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px 18px;
  width:100%;
  max-width:1160px;
  margin:0 auto;
  padding:26px clamp(14px,3vw,28px) 6px;
  border-top:1px solid var(--line);
}
.foot-brand{
  font-size:clamp(20px,4.4vw,40px);
  line-height:1.1;
  font-weight:500;
  letter-spacing:-.03em;
}
.foot-nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:2px;margin:0;padding:0}
.foot-nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 9px;
  border-radius:12px;
  text-decoration:none;
  color:var(--ink-2);
  transition:background .18s ease,color .18s ease;
}
.foot-nav a:hover{background:#ececee;color:var(--ink)}
.foot-copy{
  display:flex;
  align-items:center;
  min-height:44px;
  color:var(--mute);
  font-size:1rem;
}

/* ---------- 底部固定导航 ---------- */
.dock{
  position:fixed;
  left:50%;
  bottom:14px;
  transform:translateX(-50%);
  z-index:70;
  max-width:min(calc(100% - 20px),1100px);
  padding:6px;
  border-radius:22px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.94);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:0 14px 34px -18px rgba(0,0,0,.4);
  overflow-x:auto;
  scrollbar-width:none;
}
.dock::-webkit-scrollbar{display:none}
.dock ul{list-style:none;display:flex;gap:2px;margin:0;padding:0}
.dock a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 13px;
  border-radius:16px;
  white-space:nowrap;
  text-decoration:none;
  color:var(--ink-2);
  transition:background .18s ease,color .18s ease;
}
.dock a:hover{background:var(--mist);color:var(--ink)}
.dock a.on{background:var(--ink);color:#fff}

/* ---------- 动效 ---------- */
.reveal{opacity:1}
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
html.js .reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html.js .reveal{opacity:1;transform:none}
}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .hero{
    grid-template-columns:minmax(0,1fr);
    min-height:auto;
    padding-top:clamp(78px,12vh,104px);
  }
  .hero-num{font-size:clamp(96px,32vw,220px)}
  .hero-card{order:2;min-height:220px}
  .hero-shot{min-height:220px}
  .board{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;order:-1;padding:16px}
  .rail ul{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:4px}
  .rail a{min-height:44px}
  .foot{flex-direction:column;align-items:flex-start}
  .foot-copy{min-height:0;padding-bottom:6px}
}

@media (max-width:520px){
  body{padding-bottom:96px}
  .mark{width:42px;height:42px}
  .hero-in{padding:22px 20px 26px}
  .dock{bottom:10px;border-radius:20px}
  .dock a{padding:0 11px;min-height:44px}
  .prose > section,.prose > div{padding:20px 18px;border-radius:24px}
}

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