@font-face{
  font-family:'Instrument Serif';
  src:url('../fonts/instrument-serif.woff2') format('woff2');
  font-weight:400;font-style:normal;font-display:swap;
}
@font-face{
  font-family:'Instrument Serif';
  src:url('../fonts/instrument-serif-italic.woff2') format('woff2');
  font-weight:400;font-style:italic;font-display:swap;
}
@font-face{
  font-family:'Inter';
  src:url('../fonts/inter.woff2') format('woff2');
  font-weight:200 700;font-style:normal;font-display:swap;
}

:root{
  --bone:#F2F0EA;
  --ink:#15160F;
  --ink-60:rgba(21,22,15,.56);
  --ink-40:rgba(21,22,15,.38);
  --line:rgba(21,22,15,.13);

  --dark:#0A0A0B;
  --light-ink:#EFEAE1;
  --light-70:rgba(239,234,225,.72);
  --light-55:rgba(239,234,225,.5);
  --light-35:rgba(239,234,225,.32);
  --light-line:rgba(239,234,225,.14);

  --gold:#B99A6B;

  --pad:clamp(20px,4.4vw,64px);
  --head-h:84px;
  --foot-h:78px;

  --sans:'Inter','Helvetica Neue',-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  --serif:'Instrument Serif',Georgia,'Songti SC','Times New Roman',serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bone);
  color:var(--ink);
  font-family:var(--sans);
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer;}
h1,h2,p{margin:0;}
::selection{background:rgba(21,22,15,.9);color:var(--bone);}

/* ---------- grain ---------- */
.grain{
  position:fixed;inset:0;z-index:60;pointer-events:none;
  opacity:.32;mix-blend-mode:soft-light;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.78' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='.42'/%3E%3C/svg%3E");
}

/* ---------- header ---------- */
.site-head{
  position:fixed;top:0;left:0;right:0;height:var(--head-h);z-index:50;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  padding:0 var(--pad);
  color:var(--ink);
  transition:color .55s cubic-bezier(.4,0,.2,1);
}
body.is-dark .site-head{color:var(--light-ink);}

.brand{display:inline-flex;align-items:center;gap:11px;justify-self:start;}
.brand-mark{width:22px;height:17px;flex:none;}
.brand-name{
  font-size:14px;font-weight:500;letter-spacing:.34em;
  transform:translateX(.17em);
}

.nav{display:flex;gap:34px;justify-self:center;}
.nav a{
  font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;
  color:currentColor;opacity:.52;position:relative;padding:4px 0;
  transition:opacity .35s;
}
.nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .5s cubic-bezier(.22,.8,.24,1);
}
.nav a:hover{opacity:1;}
.nav a:hover::after{transform:scaleX(1);}

.head-cta{
  justify-self:end;display:inline-flex;align-items:center;gap:10px;
  font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;
}
.cta-line{
  display:block;width:26px;height:1px;background:currentColor;opacity:.45;
  transition:width .45s cubic-bezier(.22,.8,.24,1),opacity .45s;
}
.head-cta:hover .cta-line{width:42px;opacity:1;}

/* ---------- shared type ---------- */
.eyebrow{
  display:flex;align-items:center;gap:12px;
  font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--ink-60);
}
.eyebrow .idx{
  font-family:var(--serif);font-size:12px;letter-spacing:.04em;
  color:var(--gold);opacity:.9;
}
.eyebrow.light{color:var(--light-55);}

/* ---------- HERO ---------- */
.hero{
  position:relative;min-height:100svh;
  background:var(--bone);
  overflow:hidden;
  display:flex;align-items:center;
}
.scene{
  position:absolute;inset:0;width:100%;height:100%;display:block;
  touch-action:pan-y;cursor:grab;z-index:1;
}
.scene:active{cursor:grabbing;}

.hero-inner{
  position:relative;z-index:2;width:100%;
  padding:0 var(--pad);
  pointer-events:none;
}
.hero-copy{max-width:min(640px,54vw);}

h1{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(52px,6.5vw,124px);
  line-height:.92;letter-spacing:-.022em;
  margin-top:26px;
  color:var(--ink);
}
h1 em{font-style:italic;color:var(--ink);}

.lede{
  margin-top:30px;
  font-size:13.5px;line-height:2.05;letter-spacing:.03em;
  color:var(--ink-60);
}

.hero-meta{
  display:flex;gap:clamp(24px,3.6vw,52px);
  margin-top:44px;padding-top:18px;
  border-top:1px solid var(--line);
  max-width:440px;
}
.hero-meta .k{
  display:block;font-size:9.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--ink-40);margin-bottom:7px;
}
.hero-meta .v{font-size:12.5px;letter-spacing:.07em;color:var(--ink);}

.hero-edge{
  position:absolute;right:calc(var(--pad) - 26px);top:50%;
  transform:translateY(-50%);
  writing-mode:vertical-rl;
  display:flex;align-items:center;gap:16px;
  font-size:9.5px;letter-spacing:.44em;text-transform:uppercase;
  color:var(--ink-40);z-index:2;
}
.hero-edge .edge-sep{color:var(--gold);opacity:.7;letter-spacing:0;}

.hero-foot{
  position:absolute;left:0;right:0;bottom:0;z-index:3;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 var(--pad) clamp(22px,3vw,34px);
  font-size:9.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--ink-40);
  pointer-events:none;
}
.hero-foot > *{pointer-events:auto;}

.hint{display:inline-flex;align-items:center;gap:9px;}
.drag-ico{
  width:13px;height:13px;border:1px solid currentColor;border-radius:50%;
  position:relative;opacity:.7;
}
.drag-ico::after{
  content:"";position:absolute;inset:3px;border-radius:50%;
  border-top:1px solid currentColor;
  animation:spin 3.6s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}

.scroll{
  display:inline-flex;align-items:center;gap:11px;
  color:var(--ink-60);transition:color .3s;
}
.scroll:hover{color:var(--ink);}
.chev{
  width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;
  transform:rotate(45deg);
  animation:chev 2.4s cubic-bezier(.4,0,.2,1) infinite;
}
@keyframes chev{
  0%,100%{transform:translateY(-2px) rotate(45deg);opacity:.4;}
  50%{transform:translateY(3px) rotate(45deg);opacity:1;}
}
.pager{letter-spacing:.22em;color:var(--ink);}
.pager-dim{color:var(--ink-40);}

/* ---------- MARK / PARTICLES ---------- */
.mark{
  position:relative;min-height:calc(100svh - var(--foot-h));
  background:var(--dark);
  color:var(--light-ink);
  overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.particles{
  position:absolute;inset:0;width:100%;height:100%;display:block;z-index:1;
}
/* 暗部中心的极淡光晕 */
.mark::after{
  content:"";position:absolute;left:50%;top:44%;width:min(72vw,900px);aspect-ratio:1;
  transform:translate(-50%,-50%);
  background:radial-gradient(circle,rgba(239,234,225,.045),rgba(239,234,225,0) 62%);
  pointer-events:none;z-index:0;
}

.mark-top{
  position:absolute;top:calc(var(--head-h) + 26px);left:0;right:0;z-index:3;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 var(--pad);
  pointer-events:none;
}
.mark-count{
  font-size:9.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--light-35);
}

.mark-bottom{
  position:absolute;left:0;right:0;bottom:clamp(28px,4vw,44px);z-index:3;
  display:flex;align-items:flex-end;justify-content:space-between;gap:28px;
  padding:0 var(--pad);
  pointer-events:none;
}
.mark-bottom > *{pointer-events:auto;}

.mark-copy{max-width:420px;}
.mark-copy h2{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(30px,3.25vw,50px);
  line-height:1.02;letter-spacing:-.012em;
  color:var(--light-ink);
}
.mark-copy h2 em{font-style:italic;color:var(--light-70);}
.mark-copy p{
  margin-top:16px;max-width:360px;
  font-size:12px;line-height:1.95;letter-spacing:.03em;
  color:var(--light-55);
}

.reform{
  display:inline-flex;flex-direction:column;gap:9px;align-items:flex-start;
  font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--light-55);
  padding-bottom:2px;
  transition:color .35s;
}
.reform-line{display:block;width:100%;height:1px;background:currentColor;opacity:.34;transition:opacity .35s;}
.reform:hover{color:var(--light-ink);}
.reform:hover .reform-line{opacity:.9;}

/* ---------- FOOTER / SPEC ---------- */
.site-foot{
  background:var(--dark);
  border-top:1px solid var(--light-line);
  padding:30px var(--pad) 34px;
  color:var(--light-35);
}
.foot-row{
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  flex-wrap:wrap;
}
.foot-brand{display:flex;align-items:center;gap:10px;color:var(--light-70);}
.foot-brand .brand-mark{width:19px;height:15px;}
.foot-brand .brand-name{font-size:12px;letter-spacing:.34em;}

.foot-spec{display:flex;gap:26px;flex-wrap:wrap;font-size:10px;letter-spacing:.14em;}
.foot-links{display:flex;align-items:center;gap:22px;font-size:10px;letter-spacing:.16em;}
.foot-links a{transition:color .3s;}
.foot-links a:hover{color:var(--light-ink);}
.foot-copy{color:var(--light-35);}

/* ---------- entrance ---------- */
.rise{
  opacity:0;
  animation:rise .95s cubic-bezier(.22,.8,.24,1) forwards;
  animation-delay:var(--d,0ms);
}
@keyframes rise{
  from{opacity:0;transform:translateY(16px);}
  to{opacity:1;transform:translateY(0);}
}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .nav{display:none;}
  .hero-copy{max-width:100%;}
  .hero-edge{display:none;}
  h1{font-size:clamp(44px,9.4vw,72px);}
  .lede br{display:none;}
}
@media (max-width:720px){
  :root{--head-h:72px;}
  .hero{align-items:flex-end;padding-bottom:clamp(88px,17vh,140px);}
  .hero-inner{padding-bottom:0;}
  .hero-copy{max-width:100%;}
  .hero-meta{gap:22px;margin-top:30px;max-width:none;}
  .hero-foot{padding-bottom:20px;}
  .hero-foot .pager{display:none;}
  .mark-top{top:calc(var(--head-h) + 12px);}
  .mark-count{display:none;}
  .mark-bottom{flex-direction:column;align-items:flex-start;gap:20px;}
  .mark-copy h2{font-size:30px;}
  .mark-copy p{max-width:none;font-size:11.5px;}
  .site-foot{padding:26px var(--pad) 30px;}
  .foot-row{flex-direction:column;align-items:flex-start;gap:16px;}
  .foot-spec{gap:14px 20px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .rise{animation:none;opacity:1;}
  .drag-ico::after,.chev{animation:none;}
}