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

:root{
  --paper:#fdfbf7;
  --card:#f5f5f5;
  --ink:#1a1a1a;
  --rule:#e0e0e0;
  --mute:#6f6a62;
  --bar:66px;
  --shadow:0 2px 0 rgba(26,26,26,.04), 0 12px 26px rgba(26,26,26,.07);
  --maxw:1180px;
}

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

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Space Grotesk","Songti SC",Georgia,"Noto Serif SC",serif;
  font-size:1rem;
  line-height:1.75;
  transition:none;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:9;
  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' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

img{max-width:100%}

a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}

h1,h2,h3{font-family:"Space Grotesk","Songti SC",Georgia,serif;font-weight:700;letter-spacing:-.02em}

h2>span,h3>span{border-bottom:2px solid var(--ink);padding-bottom:.1em;display:inline-block}

:focus-visible{outline:2px solid var(--ink);outline-offset:3px}

/* ---------- 顶栏 ---------- */

.bar{
  position:sticky;
  top:0;
  z-index:30;
  background:var(--paper);
  border-bottom:1px solid var(--ink);
}

.bar nav{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 clamp(.6rem,3vw,2rem);
  min-height:var(--bar);
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:.35rem;
}

.nav-side{
  margin:0;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0 .15rem;
}

.nav-side--r{justify-content:flex-end}

.bar nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.35rem .55rem;
  font-size:.9rem;
  letter-spacing:.01em;
  text-decoration:none;
  border-bottom:2px solid transparent;
  white-space:nowrap;
}

.bar nav a:hover,
.bar nav a:focus-visible{border-bottom-color:var(--ink)}

.brand-cell{margin:0;text-align:center}

.brand-cell a{
  font-size:1.02rem;
  font-weight:700;
  letter-spacing:-.02em;
  padding:.35rem .5rem;
  border-bottom:2px solid var(--ink);
}

.cta{
  background:var(--ink);
  color:var(--paper)!important;
  border-radius:10px!important;
  border-bottom:none!important;
  padding:.35rem 1rem!important;
  font-weight:600;
}

.drop{position:relative;display:inline-flex;align-items:center}

.drop-panel{
  position:absolute;
  top:100%;
  left:0;
  min-width:11rem;
  display:flex;
  flex-direction:column;
  padding:.4rem;
  background:var(--paper);
  border:1px solid var(--ink);
  border-radius:10px;
  box-shadow:var(--shadow);
  opacity:0;
  visibility:hidden;
  z-index:5;
}

.drop:hover .drop-panel,
.drop:focus-within .drop-panel{opacity:1;visibility:visible}

.drop-panel a{width:100%;justify-content:flex-start}

/* ---------- 主区 ---------- */

main{
  display:grid;
  grid-template-columns:15.5rem minmax(0,1fr);
  column-gap:clamp(1.4rem,4vw,3.4rem);
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 clamp(.85rem,4vw,2rem);
}

/* ---------- 首屏 ---------- */

.hero{
  grid-column:1 / -1;
  display:grid;
  grid-template-columns:1fr 1fr;
  align-items:center;
  gap:clamp(1.2rem,4vw,3rem);
  min-height:calc(100vh - var(--bar));
  padding:clamp(1.6rem,5vw,3.5rem) 0;
  border-bottom:1px solid var(--ink);
}

.hero-art{
  margin:0;
  align-self:stretch;
  min-height:min(62vh,440px);
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--card);
  border:1px solid var(--ink);
  border-radius:10px;
  box-shadow:var(--shadow);
  overflow:hidden;
  clip-path:polygon(0 0,100% 0,93% 100%,0 100%);
}

.hero-art[data-empty="1"]::after{
  content:"";
  width:120px;
  height:120px;
  border:1px solid var(--ink);
  border-radius:50%;
  opacity:.25;
}

.hero-art img{width:100%;height:100%;object-fit:cover;display:block;border-radius:10px}

.hero-copy{text-align:right}

.hero-copy h1{
  font-size:clamp(2.1rem,6vw,4.3rem);
  line-height:1.02;
  letter-spacing:-.04em;
  text-transform:uppercase;
  margin:0 0 1.1rem;
}

.hero-lede{
  margin:0 0 1.4rem auto;
  max-width:32ch;
  color:var(--mute);
  font-size:.98rem;
}

.hero-acts{margin:0}

.hero-jump{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.5rem 1.15rem;
  background:var(--ink);
  color:var(--paper);
  border-radius:10px;
  text-decoration:none;
  font-weight:600;
  font-size:.92rem;
}

/* ---------- 侧栏 ---------- */

.rail{
  grid-column:1;
  grid-row:2 / -1;
  align-self:start;
  position:sticky;
  top:calc(var(--bar) + 1.1rem);
  display:flex;
  flex-direction:column;
  gap:1rem;
  padding:clamp(1.6rem,3vw,2.4rem) 0;
}

.rail-block{
  background:var(--card);
  border:1px solid var(--rule);
  border-radius:10px;
  box-shadow:var(--shadow);
  padding:.9rem 1rem 1rem;
}

.rail-block h2{
  font-size:.76rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  margin:0 0 .6rem;
  font-weight:600;
}

.rail-block h2>span{border-bottom-width:1px}

.rail-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
}

.rail-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.15rem 0;
  font-size:.93rem;
  text-decoration:none;
  border-bottom:1px dotted var(--rule);
}

.rail-list li:last-child a{border-bottom:none}

.rail-brand,
.rail-top{margin:0}

.rail-brand a,
.rail-top a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-size:.9rem;
}

.rail-brand a{font-weight:600}

/* ---------- 正文各节 ---------- */

main>section:not(.hero){
  grid-column:2;
  padding:clamp(2rem,4vw,3.1rem) 0;
  border-bottom:1px solid var(--rule);
  scroll-margin-top:calc(var(--bar) + 1.2rem);
}

main>section:not(.hero):last-child{border-bottom:none}

main>section h2{
  font-size:clamp(1.45rem,3vw,2.05rem);
  line-height:1.18;
  margin:0 0 .9rem;
}

main>section h3{
  font-size:1.14rem;
  margin:1.7rem 0 .5rem;
}

main>section p{margin:0 0 1.1rem;max-width:66ch}

main>section ul,
main>section ol{padding-left:1.25rem;max-width:66ch}

main>section li{margin:.4rem 0}

main>section figure{margin:1.3rem 0}

main>section img{
  border:1px solid var(--rule);
  border-radius:10px;
  box-shadow:var(--shadow);
  height:auto;
}

main>section blockquote{
  margin:1.3rem 0;
  padding:.85rem 1.1rem;
  background:var(--card);
  border-left:3px solid var(--ink);
  border-radius:0 10px 10px 0;
}

main>section table{
  width:100%;
  border-collapse:collapse;
  font-size:.94rem;
}

main>section th,
main>section td{
  border:1px solid var(--rule);
  padding:.55rem .7rem;
  text-align:left;
}

main>section code{
  font-size:.92em;
  background:var(--card);
  padding:.1em .35em;
  border-radius:4px;
}

/* ---------- 页脚 ---------- */

.foot{
  max-width:var(--maxw);
  margin:clamp(2rem,6vw,3.5rem) auto 0;
  padding:clamp(1.5rem,4vw,2.4rem) clamp(.85rem,4vw,2rem);
  border-top:1px solid var(--ink);
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:1rem 1.5rem;
  align-items:end;
}

.foot-big{
  margin:0;
  font-family:"Space Grotesk","Songti SC",serif;
  font-size:clamp(1.5rem,5.5vw,3rem);
  font-weight:700;
  line-height:1;
  letter-spacing:-.04em;
  text-transform:uppercase;
}

.foot-note{
  margin:0;
  font-size:.8rem;
  letter-spacing:.06em;
  color:var(--mute);
  align-self:end;
}

.foot-end{
  display:block;
  align-self:end;
  font-size:.78rem;
  color:var(--mute);
  text-align:right;
}

/* ---------- 揭示 ---------- */

html.js [data-reveal]>*{
  opacity:0;
  transform:translateY(8px);
  transition:opacity 150ms steps(2),transform 150ms steps(2);
}

html.js [data-reveal].is-in>*{
  opacity:1;
  transform:none;
}

/* ---------- 断点 ---------- */

@media (max-width:900px){
  main{grid-template-columns:1fr}

  main>div:not(.hero){grid-column:1}

  .rail{
    grid-column:1;
    grid-row:auto;
    position:static;
    flex-direction:row;
    flex-wrap:wrap;
    padding-bottom:0;
  }

  .rail-block{flex:1 1 13rem}

  .hero{
    grid-template-columns:1fr;
    min-height:0;
    padding-top:1.4rem;
  }

  .hero-art{
    clip-path:none;
    min-height:min(48vh,320px);
    order:1;
  }

  .hero-copy{text-align:left;order:2}

  .hero-lede{margin-left:0}

  .bar nav{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    padding-bottom:.4rem;
  }

  .brand-cell{order:-1;flex:0 0 100%;border-bottom:1px solid var(--rule)}

  .nav-side{justify-content:center}

  .nav-side--r{justify-content:center}

  .drop{position:static;flex-wrap:wrap;justify-content:center}

  .drop-panel{
    position:static;
    flex-direction:row;
    flex-wrap:wrap;
    justify-content:center;
    opacity:1;
    visibility:visible;
    border:none;
    box-shadow:none;
    background:transparent;
    padding:0;
    min-width:0;
  }

  .drop-panel a{width:auto}

  .foot{grid-template-columns:1fr}

  .foot-end{text-align:left}
}

@media (max-width:560px){
  .bar nav a{font-size:.86rem;padding:.35rem .45rem}
  .hero-copy h1{font-size:2rem}
  .rail-block{flex:1 1 100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js [data-reveal]>*{opacity:1;transform:none;transition:none}
}

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