@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;500;600;700&display=swap');

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

:root{
  --red:#ff0000;
  --violet:#8b00ff;
  --ink:#261717;
  --txt:#f7eff4;
  --dim:#c8b6c1;
  --edge:rgba(255,255,255,.18);
  --edge-soft:rgba(255,255,255,.1);
  --barh:66px;
  --serif:'Noto Serif JP','Hiragino Mincho ProN','Yu Mincho',serif;
  --sans:'Noto Sans JP',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
}

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

body{
  margin:0;
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.8;
  color:var(--txt);
  min-height:100vh;
  background:
    linear-gradient(180deg,rgba(9,5,7,.34),rgba(9,5,7,.76)),
    radial-gradient(78vw 66vw at 6% -12%,rgba(139,0,255,.46),transparent 62%),
    radial-gradient(66vw 56vw at 99% 5%,rgba(255,0,0,.4),transparent 64%),
    radial-gradient(92vw 62vw at 45% 114%,rgba(139,0,255,.26),transparent 66%),
    linear-gradient(180deg,#1a0b12 0%,#120a0d 48%,#0c0709 100%);
  background-attachment:fixed;
}

/* ---------- 顶栏 ---------- */
.bar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:12px;
  min-height:var(--barh);
  padding:8px max(14px,calc((100% - 1180px) / 2));
  background:rgba(16,9,12,.62);
  border-bottom:1px solid var(--edge);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
}

.mark{
  font-family:var(--serif);font-size:20px;font-weight:600;letter-spacing:.16em;
  color:var(--txt);text-decoration:none;white-space:nowrap;
  display:inline-flex;align-items:center;min-height:44px;padding-right:8px;
  text-shadow:0 0 20px rgba(255,0,0,.6);
}
.mark:hover{color:#fff}

.nav{margin-left:auto;min-width:0}

.nav-list{
  display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none;
}
.nav-list a{
  display:inline-flex;align-items:center;min-height:44px;padding:0 11px;
  font-size:16px;color:var(--dim);text-decoration:none;white-space:nowrap;
  border:1px solid transparent;
}
.nav-list a:hover,.nav-list a:focus-visible{
  color:#fff;border-color:var(--edge);background:rgba(255,255,255,.08);
}

.cta{
  display:inline-flex;align-items:center;min-height:44px;padding:0 18px;margin-left:6px;
  font-size:16px;font-weight:700;letter-spacing:.08em;color:#fff;text-decoration:none;
  background:linear-gradient(135deg,var(--red),#c4007a);
  border:1px solid rgba(255,255,255,.32);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.cta:hover{background:linear-gradient(135deg,#ff2b2b,var(--violet))}

/* ---------- 锚点条 ---------- */
.rail{
  position:sticky;top:var(--barh);z-index:35;
  display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;
  padding:10px max(14px,calc((100% - 1180px) / 2));
  background:rgba(12,7,10,.68);
  border-bottom:1px solid var(--edge-soft);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.rail::-webkit-scrollbar{display:none}
.rail a{
  flex:0 0 auto;display:inline-flex;align-items:center;min-height:40px;padding:0 12px;
  font-size:16px;color:var(--dim);text-decoration:none;
  border:1px solid var(--edge-soft);background:rgba(255,255,255,.04);
}
.rail a:hover,.rail a.on{
  color:#fff;border-color:rgba(255,0,0,.75);background:rgba(255,0,0,.18);
}

/* ---------- 版心 ---------- */
.stage{
  width:min(1180px,100% - 32px);margin:0 auto;
  display:grid;grid-template-columns:minmax(0,1fr) 286px;gap:26px;
  padding:20px 0 38px;align-items:start;
}

/* ---------- 首屏 ---------- */
.hero{
  grid-column:1 / -1;position:relative;overflow:hidden;
  display:grid;grid-template-columns:1.05fr .95fr;gap:26px;align-items:center;
  min-height:45vh;padding:20px 0 26px;
  border-bottom:1px solid var(--edge);
}
.ghost{
  position:absolute;right:40%;top:50%;transform:translate(50%,-50%);
  font-family:var(--serif);font-weight:700;font-size:clamp(130px,23vw,270px);
  line-height:1;letter-spacing:-.03em;color:transparent;
  -webkit-text-stroke:1px rgba(255,255,255,.16);
  pointer-events:none;user-select:none;
}
.hero-body{position:relative;z-index:2;text-align:center;padding-inline:6px}
.hero h1{
  font-family:var(--serif);font-weight:600;margin:0 0 14px;
  font-size:clamp(29px,4.5vw,52px);line-height:1.24;letter-spacing:.015em;
  text-shadow:0 8px 44px rgba(139,0,255,.45);
}
.lede{color:var(--dim);margin:0 auto 20px;max-width:46ch;line-height:1.72}
.hero-acts{margin:0}

.btn{
  display:inline-flex;align-items:center;justify-content:center;min-height:46px;
  padding:0 24px;text-decoration:none;color:#fff;font-weight:700;letter-spacing:.1em;
  background:linear-gradient(135deg,var(--red),var(--violet));
  border:1px solid rgba(255,255,255,.3);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.btn:hover{filter:brightness(1.12)}
.btn.flat{background:rgba(255,255,255,.08);border-color:var(--edge)}

.hero-vis{position:relative;z-index:2;aspect-ratio:16 / 11;min-height:150px}
.hero-img{width:100%;height:100%;object-fit:cover;display:block;border:1px solid var(--edge)}
.pane{
  position:absolute;display:block;border:1px solid var(--edge);
  background:linear-gradient(145deg,rgba(255,255,255,.15),rgba(255,255,255,.03));
  backdrop-filter:blur(15px);-webkit-backdrop-filter:blur(15px);
}
.p1{inset:0}
.p2{inset:16% -6% -8% 24%;z-index:2;background:rgba(255,0,0,.18);animation:drift 9s ease-in-out infinite alternate}
.p3{inset:-9% 26% 26% -8%;z-index:3;background:rgba(139,0,255,.2);animation:drift 11s ease-in-out infinite alternate-reverse}
@keyframes drift{from{transform:translate3d(0,0,0)}to{transform:translate3d(0,-10px,0)}}

/* ---------- 正文 ---------- */
.doc{
  grid-column:1;min-width:0;
  padding:clamp(18px,2.6vw,32px);
  background:linear-gradient(180deg,rgba(255,255,255,.1),rgba(255,255,255,.035));
  border:1px solid var(--edge);
  backdrop-filter:blur(15px) saturate(130%);
  -webkit-backdrop-filter:blur(15px) saturate(130%);
}
.doc article{padding:26px 0;border-top:1px solid var(--edge-soft);scroll-margin-top:130px}
.doc article:first-child{border-top:0;padding-top:4px}
.doc h2,.doc h3{
  font-family:var(--serif);font-weight:600;line-height:1.36;letter-spacing:.02em;margin:0 0 10px;
}
.doc h2{font-size:clamp(22px,2.4vw,29px)}
.doc h3{font-size:19px;color:#ffd8dd}
.doc hr{
  border:0;height:1px;margin:0 0 18px;
  background:linear-gradient(90deg,var(--red),var(--violet) 55%,transparent);
}
.doc p{margin:0 0 15px;color:#ece1e7;line-height:1.86}
.doc ul,.doc ol{margin:0 0 16px;padding-left:1.35em}
.doc li{margin-bottom:7px}
.doc a{color:#ff9090;text-decoration:underline;text-underline-offset:2px}
.doc a:hover{color:#fff}
.doc strong{color:#fff}
.doc img{max-width:100%;height:auto;display:block;margin:14px 0;border:1px solid var(--edge)}
.doc blockquote{margin:0 0 16px;padding:10px 16px;border-left:3px solid var(--violet);background:rgba(139,0,255,.12)}
.doc table{width:100%;border-collapse:collapse;font-size:16px;margin-bottom:16px}
.doc th,.doc td{border:1px solid var(--edge-soft);padding:8px 10px;text-align:left}
.doc th{background:rgba(255,255,255,.07);color:#fff}

/* ---------- 侧栏 ---------- */
.side{
  grid-column:2;align-self:start;position:sticky;top:132px;
  padding:18px;
  background:linear-gradient(180deg,rgba(255,255,255,.12),rgba(255,255,255,.04));
  border:1px solid var(--edge);
  backdrop-filter:blur(15px);-webkit-backdrop-filter:blur(15px);
}
.side h2{font-family:var(--serif);font-size:18px;font-weight:600;letter-spacing:.18em;margin:0 0 9px}
.side hr{border:0;height:1px;margin:0 0 12px;background:linear-gradient(90deg,var(--violet),transparent)}
.toc{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li + li{border-top:1px solid var(--edge-soft)}
.toc a{
  display:flex;align-items:center;gap:10px;min-height:44px;
  font-size:16px;color:var(--dim);text-decoration:none;
}
.toc a::before{
  counter-increment:t;content:counter(t,decimal-leading-zero);
  font-family:var(--serif);font-size:13px;letter-spacing:.1em;color:var(--violet);
}
.toc a:hover{color:#fff}

/* ---------- 收束 ---------- */
.closer{
  width:min(1180px,100% - 32px);margin:2px auto 36px;
  padding:clamp(22px,3vw,42px);text-align:center;
  background:linear-gradient(135deg,rgba(255,0,0,.2),rgba(139,0,255,.2));
  border:1px solid var(--edge);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
}
.closer h2{font-family:var(--serif);font-weight:600;font-size:clamp(26px,4vw,42px);letter-spacing:.08em;margin:0 0 12px}
.closer hr{
  border:0;height:1px;width:min(340px,62%);margin:0 auto 20px;
  background:linear-gradient(90deg,transparent,var(--red),var(--violet),transparent);
}

/* ---------- 页脚 ---------- */
.foot{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px 20px;
  padding:14px max(14px,calc((100% - 1180px) / 2)) 22px;
  border-top:1px solid var(--edge);
  background:rgba(9,5,7,.62);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.fbrand a{
  display:inline-flex;align-items:center;min-height:44px;
  font-family:var(--serif);font-size:17px;letter-spacing:.16em;color:var(--txt);text-decoration:none;
}
.fnav{display:flex;flex-wrap:wrap;gap:2px 4px;list-style:none;margin:0;padding:0}
.fnav a{display:inline-flex;align-items:center;min-height:40px;padding:0 9px;font-size:16px;color:var(--dim);text-decoration:none}
.fnav a:hover{color:#fff}
.fmeta{color:#a5929d;font-size:16px}

/* ---------- 入场 ---------- */
.anim .doc article{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.anim .doc article.in{opacity:1;transform:none}

@media (max-width:1080px){
  .cta{display:none}
  .nav-list a{padding:0 9px}
}

@media (max-width:900px){
  .bar{flex-wrap:wrap;padding-bottom:8px}
  .nav{order:3;flex:0 0 100%;margin-left:0}
  .nav-list{overflow-x:auto;scrollbar-width:none;padding-bottom:2px}
  .nav-list::-webkit-scrollbar{display:none}
  .rail{position:static}
  .stage{grid-template-columns:minmax(0,1fr);gap:20px;padding-top:12px}
  .side{grid-column:1;position:static;order:3}
  .hero{grid-template-columns:1fr;min-height:0;padding:8px 0 22px}
  .hero h1{margin-top:12px}
  .ghost{top:34%;right:50%;opacity:.55;font-size:clamp(110px,34vw,180px)}
  .hero-vis{order:2;aspect-ratio:16 / 9}
  .doc article{scroll-margin-top:24px}
  .doc{padding:18px}
}

@media (max-width:520px){
  body{font-size:16px}
  .fbrand a{font-size:16px}
  .foot{padding-bottom:18px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .p2,.p3{animation:none}
  *{transition:none !important}
}

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