:root{
  --ink:#1f1f1f;
  --paper:#ffffff;
  --soft:#f5f5f5;
  --line:#e6e6e6;
  --muted:#6b6b6b;
  --rail:236px;
  --r:18px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--soft);
  color:var(--ink);
  font-family:"Outfit","Work Sans",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
p{margin:0 0 16px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- shell ---------- */
.shell{padding-left:var(--rail)}
.stage{min-width:0}

/* ---------- left rail ---------- */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  gap:26px;
  padding:22px 16px 20px;
  background:var(--paper);
  border-right:1px solid var(--line);
  z-index:30;
}
.brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  border-radius:14px;
  background:var(--ink);
  color:#fff;
  text-decoration:none;
  overflow:hidden;
  flex:0 0 auto;
}
.brand .mark{width:16px;height:16px;border-radius:3px;background:#fff;transform:skewY(-14deg)}
.brand-img{width:44px;height:44px;object-fit:cover;border-radius:14px}

.rail nav{flex:1 1 auto;min-height:0;overflow:visible}
.rail-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.rail-list li{position:relative}
.rail-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:9px 12px;
  border-radius:12px;
  font-size:16px;
  font-weight:500;
  letter-spacing:.01em;
  text-decoration:none;
  transition:background .18s ease,color .18s ease;
}
.rail-list a:hover,.rail-list a:focus-visible{background:var(--soft)}
.rail-list a:focus-visible{outline:2px solid var(--ink);outline-offset:1px}

.has-sub > a::after{
  content:"";
  width:7px;
  height:7px;
  margin-left:auto;
  border-right:1.6px solid var(--ink);
  border-bottom:1.6px solid var(--ink);
  transform:rotate(-45deg) translateY(-1px);
  opacity:.5;
}

.rail-list ul.sub{
  list-style:none;
  margin:0;
  padding:6px;
  position:absolute;
  left:100%;
  top:0;
  min-width:186px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:0 12px 32px rgba(0,0,0,.09);
  opacity:0;
  visibility:hidden;
  transform:translateX(-6px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s;
}
.rail-list ul.sub a{min-height:40px;padding:7px 12px;font-weight:400}
.has-sub:hover > ul.sub,
.has-sub:focus-within > ul.sub{opacity:1;visibility:visible;transform:none}

.rail-cta{
  margin-top:auto;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  padding:11px 16px;
  border-radius:14px;
  background:var(--ink);
  color:#fff;
  font-weight:600;
  font-size:16px;
  text-decoration:none;
  transition:transform .2s ease,box-shadow .2s ease;
}
.rail-cta:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,0,0,.2)}

/* ---------- hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  min-height:70vh;
  display:flex;
  align-items:center;
  padding:72px clamp(20px,6vw,74px) 84px;
  background:var(--paper);
}
.hero::before{
  content:"";
  position:absolute;
  left:-12%;
  right:-12%;
  bottom:6vh;
  height:clamp(96px,17vh,180px);
  background:var(--soft);
  transform:skewY(-4deg);
  z-index:0;
}
.hero-inner{position:relative;z-index:1;max-width:900px}
h1{
  margin:0;
  font-size:clamp(34px,6.2vw,76px);
  line-height:1.07;
  font-weight:700;
  letter-spacing:-.03em;
}

/* ---------- content grid ---------- */
main{padding:0 clamp(16px,4vw,54px) 76px}
.bento{
  max-width:1120px;
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:18px;
  align-items:start;
}

.art-head{
  grid-column:1 / -1;
  padding:6px 2px 12px;
  margin-bottom:6px;
  border-bottom:2px solid var(--ink);
}
.art-head h2{
  margin:0 0 6px;
  font-size:clamp(18px,1.9vw,22px);
  font-weight:600;
  letter-spacing:.02em;
}
.subtitle{margin:0;color:var(--muted);font-size:16px}

.bento > article{
  grid-column:span 2;
  position:relative;
  background:var(--paper);
  border-radius:var(--r);
  padding:24px 24px 26px;
  border-bottom:3px solid var(--ink);
  box-shadow:0 4px 6px rgba(0,0,0,.05);
  scroll-margin-top:24px;
  transition:transform .25s ease,box-shadow .25s ease,opacity .45s ease;
}
.bento > article:hover{
  transform:translateY(-3px) scale(1.012);
  box-shadow:0 16px 34px rgba(0,0,0,.1);
}
.bento > article:nth-of-type(1){grid-column:span 3}
.bento > article:nth-of-type(2){grid-column:span 1}
.bento > article:nth-of-type(3){grid-column:span 1}
.bento > article:nth-of-type(4){grid-column:span 3}
.bento > article:nth-of-type(5){grid-column:span 2}
.bento > article:nth-of-type(6){grid-column:span 2}
.bento > article:nth-of-type(7){grid-column:1 / -1}

.bento > article > :first-child{margin-top:0}
.bento > article > :last-child{margin-bottom:0}

.bento h2{
  margin:0 0 10px;
  font-size:clamp(20px,2.2vw,26px);
  line-height:1.28;
  font-weight:600;
  letter-spacing:-.01em;
}
.bento h3{
  margin:22px 0 8px;
  font-size:18px;
  font-weight:600;
  letter-spacing:-.01em;
}
.bento p{margin:0 0 14px}
.bento ul,.bento ol{margin:0 0 14px;padding-left:1.25em}
.bento li{margin:.32em 0}
.bento a{text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.bento a:hover{background:#f0f0f0}
.bento strong{font-weight:600}
.bento blockquote{
  margin:0 0 14px;
  padding:2px 0 2px 16px;
  border-left:3px solid var(--ink);
  color:#3a3a3a;
}

/* reveal */
.reveal-on .bento > article:not(.in){opacity:0;transform:translateY(16px)}

/* ---------- footer ---------- */
.foot{
  background:var(--ink);
  color:#efefef;
  padding:44px clamp(18px,5vw,56px) 28px;
  display:grid;
  grid-template-columns:1.5fr 1fr;
  gap:26px 34px;
  align-items:start;
}
.foot article{min-width:0}
.foot-name{margin:0 0 14px;font-size:18px;font-weight:600;letter-spacing:.01em}
.sub{display:flex;flex-wrap:wrap;gap:8px;max-width:360px}
.sub input{
  flex:1 1 160px;
  min-height:44px;
  padding:10px 14px;
  border-radius:12px;
  border:1px solid #3b3b3b;
  background:#141414;
  color:#fff;
  font-family:inherit;
  font-size:16px;
}
.sub input::placeholder{color:#8d8d8d}
.sub button{
  min-height:44px;
  padding:10px 22px;
  border:0;
  border-radius:12px;
  background:#fff;
  color:var(--ink);
  font-family:inherit;
  font-size:16px;
  font-weight:600;
  cursor:pointer;
  transition:transform .2s ease;
}
.sub button:hover{transform:translateY(-2px)}

.foot-links ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 18px;
}
.foot-links a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 0;
  font-size:16px;
  color:#d5d5d5;
  text-decoration:none;
}
.foot-links a:hover{color:#fff}

.foot-note{
  grid-column:1 / -1;
  text-align:center;
  padding-top:18px;
  border-top:1px solid #3a3a3a;
}
.foot-note p{margin:0;font-size:15px;color:#b9b9b9}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .shell{padding-left:0}
  .rail{
    position:static;
    width:auto;
    flex-direction:row;
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    padding:12px 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .rail nav{flex:1 1 100%;order:3;overflow:visible}
  .rail-list{flex-direction:row;flex-wrap:wrap;gap:6px}
  .rail-list li{position:static}
  .rail-list a{background:var(--soft);font-size:16px;padding:9px 12px}
  .has-sub > a::after{display:none}
  .rail-list ul.sub{display:contents}
  .rail-list ul.sub a{background:#fafafa}
  .rail-cta{margin-top:0;order:2;min-height:44px;padding:10px 18px}
  .brand{width:40px;height:40px;border-radius:12px}
  .brand-img{width:40px;height:40px}

  .hero{min-height:0;padding:44px 20px 56px}
  .hero::before{bottom:-6px;height:70px}
  h1{font-size:clamp(30px,8.6vw,44px)}

  .bento{grid-template-columns:1fr;gap:14px}
  .bento > article,
  .bento > article:nth-of-type(n){grid-column:1 / -1}
  .bento > article{padding:20px 18px 22px}
  .bento > article:hover{transform:none}
  main{padding:0 14px 56px}

  .foot{grid-template-columns:1fr;padding:34px 18px 24px;gap:22px}
  .foot-links ul{grid-template-columns:1fr 1fr}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none !important;animation:none !important}
  .reveal-on .bento > article:not(.in){opacity:1;transform:none}
}

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