:root{
  --ink:#111111;
  --paper:#F5F1E6;
  --red:#E8412C;
  --card:#1B1A17;
  --line:rgba(245,241,230,.16);
  --rail:148px;
  --r:28px;
  --disp:'Outfit','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--disp);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--red)}
h1,h2,h3{font-weight:900;letter-spacing:-.015em}
:focus-visible{outline:2px solid var(--red);outline-offset:3px;border-radius:6px}

/* ---------- fixed vertical rail ---------- */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  z-index:40;
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:20px 14px 22px;
  background:var(--ink);
  border-right:1px solid var(--line);
}
.rail__brand{
  flex:none;
  width:44px;
  height:44px;
  border-radius:14px;
  background:var(--red);
  color:var(--paper);
  display:grid;
  place-items:center;
  overflow:hidden;
  text-decoration:none;
  transition:transform .25s cubic-bezier(.2,.7,.2,1),border-radius .25s ease;
}
.rail__brand:hover{transform:rotate(-6deg) scale(1.06);border-radius:20px}
.rail__mark{width:100%;height:100%;object-fit:cover}
.rail__ini{font-size:15px;font-weight:900;letter-spacing:-.03em}
.rail__nav{margin-top:4px;overflow-y:auto;scrollbar-width:none}
.rail__nav::-webkit-scrollbar{display:none}
.rail__nav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.rail__nav a{
  display:flex;
  align-items:baseline;
  gap:7px;
  min-height:44px;
  padding:9px 10px;
  border-radius:14px;
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  line-height:1.3;
  font-weight:500;
  transition:background .22s ease,color .22s ease,transform .22s ease;
}
.rail__nav a:hover{background:var(--red);transform:translateX(3px)}
.rail__nav a.is-active{background:var(--paper);color:var(--ink)}
.rail__nav a.is-active .idx{color:var(--red);opacity:1}
.idx{
  flex:none;
  font-size:11px;
  font-weight:900;
  letter-spacing:.06em;
  opacity:.5;
  font-variant-numeric:tabular-nums;
}
.rail__cta{
  margin-top:auto;
  flex:none;
  display:grid;
  place-items:center;
  min-height:44px;
  border-radius:999px;
  background:var(--red);
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  font-weight:700;
  letter-spacing:.08em;
  transition:background .22s ease,color .22s ease;
}
.rail__cta:hover{background:var(--paper);color:var(--ink)}

main{margin-left:var(--rail)}
.wrap{max-width:1080px;margin:0 auto;padding:0 clamp(16px,3.4vw,44px)}
.stage{padding:0 0 clamp(40px,6vw,72px)}
.doc{counter-reset:sec}
[id]{scroll-margin-top:28px}

/* ---------- hero ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:grid;
  place-items:center;
  align-content:center;
  padding:110px 0 96px;
  overflow:hidden;
  isolation:isolate;
}
.hero__ghost{
  position:absolute;
  top:7%;
  left:50%;
  transform:translateX(-50%);
  z-index:1;
  font-size:clamp(4.2rem,21vw,15.5rem);
  font-weight:900;
  line-height:.8;
  letter-spacing:-.05em;
  white-space:nowrap;
  color:rgba(245,241,230,.05);
  -webkit-text-stroke:2px rgba(232,65,44,.55);
  pointer-events:none;
  user-select:none;
  will-change:transform;
}
.hero__media{
  position:absolute;
  inset:auto 0 0 0;
  height:48%;
  z-index:0;
  overflow:hidden;
  clip-path:polygon(0 24%,100% 0,100% 100%,0 100%);
}
.hero__media img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(.3) contrast(1.1);
  opacity:.5;
}
.hero__media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,var(--ink) 0%,rgba(17,17,17,.18) 42%,rgba(17,17,17,.88) 100%);
}
.hero__inner{position:relative;z-index:2;text-align:center;padding:0 18px}
.hero__title{
  margin:0;
  font-size:clamp(2.4rem,9vw,6rem);
  line-height:.96;
  letter-spacing:-.03em;
  text-wrap:balance;
}
.hero__title .l{
  display:inline-block;
  opacity:0;
  transform:translateY(.45em);
  animation:rise .85s cubic-bezier(.2,.7,.2,1) forwards;
  animation-delay:calc(var(--i,0) * 38ms);
}
@keyframes rise{
  from{opacity:0;transform:translateY(.45em) rotate(5deg)}
  to{opacity:1;transform:none}
}
.hero__cue{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin-top:34px;
  padding:11px 22px;
  min-height:44px;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  letter-spacing:.08em;
  transition:background .22s ease,border-color .22s ease,transform .22s ease;
}
.hero__cue:hover{background:var(--red);border-color:var(--red);transform:translateY(3px)}

/* ---------- intro band ---------- */
.intro{
  padding:clamp(30px,5vw,62px) 0 clamp(22px,3vw,34px);
  border-top:1px solid var(--line);
  margin-bottom:clamp(22px,3vw,34px);
}
.intro h2{
  margin:0 0 16px;
  font-size:clamp(1.7rem,4.4vw,3.1rem);
  line-height:1.05;
  letter-spacing:-.03em;
}
.intro .subtitle{
  margin:0;
  max-width:62ch;
  font-size:clamp(1rem,1.45vw,1.12rem);
  line-height:1.85;
  color:rgba(245,241,230,.78);
}

/* ---------- content blocks ---------- */
.doc > div{
  position:relative;
  counter-increment:sec;
  background:var(--card);
  border-radius:var(--r);
  padding:clamp(24px,3.6vw,46px);
  margin:0 0 clamp(18px,2.4vw,28px);
  scroll-margin-top:28px;
}
.doc > div::before{
  content:counter(sec,decimal-leading-zero);
  position:absolute;
  top:20px;
  right:clamp(20px,3.2vw,40px);
  font-size:13px;
  font-weight:900;
  letter-spacing:.12em;
  color:var(--red);
}
.doc div h2{
  margin:0 0 .7em;
  padding-right:46px;
  font-size:clamp(1.35rem,2.6vw,2rem);
  line-height:1.22;
}
.doc div h3{margin:1.5em 0 .5em;font-size:1.14rem;line-height:1.35}
.doc div p{margin:0 0 1em;max-width:70ch;color:rgba(245,241,230,.83)}
.doc div p:last-child{margin-bottom:0}
.doc div a{color:var(--red);text-underline-offset:3px}
.doc div ul,.doc div ol{margin:0 0 1em;padding-left:1.3em;color:rgba(245,241,230,.83);max-width:70ch}
.doc div li{margin:.4em 0}
.doc div li::marker{color:var(--red)}
.doc div img{border-radius:18px;margin:1em 0}
.doc div strong{color:var(--paper)}
.doc div blockquote{
  margin:1.2em 0;
  padding:2px 0 2px 18px;
  border-left:3px solid var(--red);
  color:rgba(245,241,230,.72);
}
.doc div table{width:100%;border-collapse:collapse;font-size:16px}
.doc div th,.doc div td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left}

/* ---------- reveal ---------- */
.rv{opacity:0;transform:translateY(26px)}
.rv.in{
  opacity:1;
  transform:none;
  transition:opacity .6s ease,transform .72s cubic-bezier(.2,.7,.2,1);
}

/* ---------- footer ---------- */
.foot{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:3px;
  padding:46px 16px 62px;
  border-top:1px solid var(--line);
  text-align:center;
}
.foot p{margin:0;font-size:16px;font-weight:500}
.foot small{font-size:15px;color:rgba(245,241,230,.5);letter-spacing:.02em}
.foot small:empty{display:none}

/* ---------- mobile ---------- */
@media (max-width:880px){
  .rail{
    inset:0 0 auto 0;
    width:auto;
    height:auto;
    flex-direction:row;
    align-items:center;
    gap:8px;
    padding:8px 12px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .rail__brand{width:42px;height:42px;border-radius:12px}
  .rail__nav{margin-top:0;flex:1;overflow-x:auto;overflow-y:hidden}
  .rail__nav ul{flex-direction:row;gap:2px}
  .rail__nav a{white-space:nowrap;padding:10px 12px}
  .rail__nav a:hover{transform:none}
  .rail__cta{margin-top:0;padding:0 16px}
  main{margin-left:0;padding-top:58px}
  .hero{min-height:calc(100svh - 58px);padding:52px 0 74px}
  .hero__ghost{top:5%}
  .doc > div{scroll-margin-top:76px}
  .foot{padding-bottom:44px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .hero__title .l{opacity:1;transform:none;animation:none}
  .rv{opacity:1;transform:none}
}

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