:root{
  --ink:#000000;
  --paper:#ffffff;
  --soft:rgba(0,0,0,.055);
  --line:rgba(0,0,0,.14);
  --hair:rgba(0,0,0,.08);
  --mute:rgba(0,0,0,.62);
  --glass:rgba(255,255,255,.62);
  --r:28px;
  --gut:clamp(18px,4vw,56px);
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  overflow-x:hidden;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:Inter,"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;height:auto}

h1,h2,h3,h4{
  font-family:Calistoga,"Noto Serif SC",Georgia,"Songti SC",serif;
  font-weight:400;
  line-height:1.16;
  letter-spacing:-.012em;
  margin:0 0 .5em;
}

p{margin:0 0 1.15em}
p:last-child{margin-bottom:0}

a{color:var(--ink)}
a:focus-visible,
summary:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:6px}

::selection{background:var(--ink);color:var(--paper)}

/* ---------- 报头 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:80;
  display:grid;
  grid-template-columns:1fr auto auto;
  align-items:center;
  gap:10px;
  padding:10px var(--gut);
  background:rgba(255,255,255,.84);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid var(--line);
}

.brand{
  justify-self:start;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  max-width:100%;
  font-size:16px;
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.nav-details{position:relative;justify-self:end}

.nav-details > summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 15px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:16px;
  letter-spacing:.04em;
  user-select:none;
}
.nav-details > summary::-webkit-details-marker{display:none}
.nav-details > summary::after{
  content:"";
  width:7px;
  height:7px;
  border-right:1.5px solid var(--ink);
  border-bottom:1.5px solid var(--ink);
  transform:rotate(45deg) translateY(-2px);
  transition:transform .22s ease;
}
.nav-details[open] > summary::after{transform:rotate(225deg) translateY(-2px)}

.nav-details > menu{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:2px;
}

.nav-details > menu a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  border-radius:999px;
  font-size:16px;
  text-decoration:none;
  color:var(--ink);
  white-space:nowrap;
}
.nav-details > menu a:hover{background:var(--soft)}

.contact{
  justify-self:end;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  font-size:16px;
  letter-spacing:.04em;
  text-decoration:none;
  white-space:nowrap;
}
.contact:hover{opacity:.84}

/* ---------- 主区 ---------- */
main{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  padding:0 var(--gut);
}

article{
  min-width:0;
  max-width:70ch;
  padding:0 0 clamp(40px,7vw,80px);
}

/* ---------- 首屏 ---------- */
.hero{
  display:grid;
  grid-template-columns:1fr 1fr;
  align-items:center;
  gap:clamp(24px,5vw,64px);
  min-height:100vh;
  min-height:100svh;
  padding:clamp(16px,4vw,48px) 0 clamp(36px,7vw,80px);
}

.hero-text{
  grid-column:2;
  order:2;
  text-align:center;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:16px;
}

.hero h1{
  font-size:clamp(30px,4.6vw,62px);
  margin:0;
  letter-spacing:-.02em;
}

.hero-desc{
  margin:0;
  max-width:34ch;
  color:var(--mute);
  font-size:17px;
}

.hero-jump{
  margin-top:6px;
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 28px;
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  letter-spacing:.08em;
}
.hero-jump:hover{opacity:.86}

.hero-fig{
  grid-column:1;
  grid-row:1;
  order:1;
  margin:0;
  aspect-ratio:4/5;
  border-radius:var(--r);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--soft);
}
.hero-fig img{width:100%;height:100%;object-fit:cover;display:block}

/* ---------- 正文 ---------- */
article > div{
  padding:clamp(28px,4vw,52px) 0;
  border-top:1px solid var(--line);
  scroll-margin-top:96px;
}
article > div:first-of-type{border-top:0}

article > div:not(.hero) > p:first-of-type::first-letter{
  float:left;
  font-family:Calistoga,Georgia,serif;
  font-size:3.3em;
  line-height:.84;
  padding:.08em .14em 0 0;
  letter-spacing:-.02em;
}

article h2,
article h3{
  font-size:clamp(24px,3vw,38px);
  margin:0 0 .55em;
  max-width:24ch;
}

article h3{font-size:clamp(20px,2.2vw,27px)}

article h2 > span,
article h3 > span{display:inline}

article h2 > span::before,
article h3 > span::before{
  content:"";
  display:inline-block;
  width:.72em;
  height:2px;
  background:var(--ink);
  vertical-align:.32em;
  margin-right:.42em;
}

article > div > p{max-width:64ch}

article ul,
article ol{padding-left:1.25em;margin:0 0 1.2em;max-width:64ch}
article li{margin:0 0 .45em}

article strong{font-weight:600}

article blockquote{
  margin:1.9em 0;
  padding:.1em 0 .1em 1.15em;
  border-left:3px solid var(--ink);
  font-family:Calistoga,"Noto Serif SC",Georgia,serif;
  font-size:1.2em;
  line-height:1.5;
  max-width:46ch;
}
article blockquote p{margin:0 0 .6em}

article figure{margin:1.9em 0}
article figure img{border-radius:var(--r);display:block;width:100%}
article figcaption{font-size:16px;color:var(--mute);margin-top:.65em}

article a{text-decoration-thickness:1px;text-underline-offset:3px}
article a:hover{background:var(--soft)}

article table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:16px}
article th,
article td{border-bottom:1px solid var(--line);padding:.7em .5em;text-align:left;vertical-align:top}

article hr{border:0;border-top:1px solid var(--line);margin:2em 0}

article code,
article pre{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:15px}
article pre{background:var(--soft);border-radius:18px;padding:16px;overflow-x:auto}

/* ---------- 侧栏 ---------- */
.rail{
  align-self:start;
  margin:clamp(28px,5vw,52px) 0 clamp(40px,7vw,80px);
  padding:20px 18px;
  border:1px solid var(--hair);
  border-radius:var(--r);
  background:var(--glass);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}

.rail h2{
  font-size:17px;
  margin:0 0 .7em;
  letter-spacing:.12em;
}
.rail h2 > span{
  display:inline-block;
  padding-bottom:.28em;
  border-bottom:2px solid var(--ink);
}

.rail ul{list-style:none;margin:0;padding:0}
.rail li + li{border-top:1px solid var(--hair)}

.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 4px;
  font-size:16px;
  line-height:1.4;
  text-decoration:none;
  color:var(--ink);
}
.rail a:hover{background:var(--soft);border-radius:12px}

/* ---------- 页脚 ---------- */
.colophon{
  border-top:1px solid var(--ink);
  margin-top:clamp(20px,4vw,48px);
}

.cta{padding:clamp(44px,9vw,110px) var(--gut);text-align:center}

.cta a{display:block;text-decoration:none;color:var(--ink)}

.cta h2{
  font-size:clamp(28px,7vw,84px);
  margin:0;
  letter-spacing:-.03em;
  line-height:1.08;
}
.cta h2 > span{
  display:inline-block;
  padding-bottom:.06em;
  border-bottom:2px solid var(--ink);
}
.cta a:hover h2 > span{border-bottom-width:6px}

.base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding:16px var(--gut) 26px;
  border-top:1px solid var(--line);
  font-size:16px;
}

.base address{font-style:normal;color:var(--mute)}

.base ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  margin:0;
  padding:0;
}

.base ul a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 10px;
  font-size:16px;
  text-decoration:none;
  color:var(--ink);
  border-radius:999px;
}
.base ul a:hover{background:var(--soft)}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .nav-details > summary{display:inline-flex}

  .nav-details > menu{
    position:absolute;
    right:0;
    top:calc(100% + 10px);
    width:min(74vw,290px);
    flex-direction:column;
    gap:0;
    padding:8px;
    background:var(--paper);
    border:1px solid var(--line);
    border-radius:22px;
    box-shadow:0 24px 60px rgba(0,0,0,.14);
  }
  .nav-details > menu a{width:100%;border-radius:14px}

  .hero{
    grid-template-columns:1fr;
    min-height:0;
    padding-top:clamp(22px,6vw,40px);
  }
  .hero-text{grid-column:1;order:1}
  .hero-fig{grid-column:1;grid-row:auto;order:2;aspect-ratio:16/10}

  article{max-width:none}
  article > div > p{max-width:none}
  article blockquote{font-size:1.12em}
}

@media (min-width:901px){
  .nav-details > summary{display:none}
  .nav-details > menu{gap:0}
}

@media (min-width:1000px){
  main{
    grid-template-columns:15rem minmax(0,1fr);
    column-gap:clamp(24px,4vw,64px);
    align-items:start;
    max-width:1440px;
    margin:0 auto;
  }
  article{grid-column:2;grid-row:1;padding-top:clamp(20px,3vw,40px)}
  .rail{grid-column:1;grid-row:1;position:sticky;top:92px;margin-top:clamp(20px,3vw,40px)}
}

@media (max-width:420px){
  .masthead{gap:8px}
  .brand{font-size:15px}
  .contact{padding:0 13px;font-size:15px}
  .nav-details > summary{padding:0 12px;font-size:15px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .nav-details > summary::after{transition:none}
}

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