@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');

:root{
  --ink:#1a1a2e;
  --ink-d:#121222;
  --ink-c:#23234a;
  --neon:#ff0000;
  --pink:#ff006e;
  --cyan:#4de8ff;
  --fg:#eeeaf7;
  --dim:#a8a3c9;
  --edge:rgba(255,0,110,.26);
  --wrap:1180px;
  --serif:"Noto Serif JP",serif;
  --sans:"Noto Sans JP",system-ui,-apple-system,"Segoe UI",sans-serif;
}

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

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

body{
  margin:0;
  background-color:var(--ink);
  color:var(--fg);
  font-family:var(--sans);
  font-weight:300;
  font-size:17px;
  line-height:1.78;
  overflow-x:hidden;
  background-image:
    radial-gradient(circle,rgba(255,0,110,.17) 1px,transparent 1px),
    radial-gradient(circle,rgba(255,0,0,.12) 1px,transparent 1px);
  background-size:26px 26px,26px 26px;
  background-position:0 0,13px 13px;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:radial-gradient(ellipse at 50% -10%,rgba(35,35,74,.18),rgba(18,18,34,.88) 70%);
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:70;
  pointer-events:none;
  opacity:.3;
  background:repeating-linear-gradient(to bottom,rgba(0,0,0,.55) 0 1px,transparent 1px 3px);
}

.vh{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* 顶栏 */
.top{
  position:relative;
  z-index:5;
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
  padding:12px max(14px,calc((100% - var(--wrap)) / 2 + 20px));
  border-bottom:1px solid var(--edge);
  background:rgba(18,18,34,.9);
}

.brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  flex:0 0 auto;
  color:var(--neon);
  text-decoration:none;
  filter:drop-shadow(0 0 9px rgba(255,0,110,.85));
  transition:transform .25s ease,filter .25s ease;
}
.brand:hover,.brand:focus-visible{transform:rotate(-6deg) scale(1.06);filter:drop-shadow(0 0 16px rgba(255,0,110,1))}
.brand-img{width:40px;height:40px;object-fit:contain;display:block}
.brand-svg{width:40px;height:40px;display:block}

.nav{flex:1 1 auto;min-width:0}
.nav p{margin:0;display:flex;flex-wrap:wrap;gap:2px}

.navlink{
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:10px 11px;
  color:var(--fg);
  text-decoration:none;
  font-size:.95rem;
  letter-spacing:.03em;
  border-radius:8px;
  transition:color .18s,background .18s,box-shadow .18s;
}
.ico{width:8px;height:8px;fill:var(--pink);flex:0 0 auto;transition:transform .3s ease}
.navlink:hover,.navlink:focus-visible{color:#fff;background:rgba(255,0,110,.16);box-shadow:inset 0 0 0 1px rgba(255,0,110,.55)}
.navlink:hover .ico,.navlink:focus-visible .ico{transform:rotate(90deg) scale(1.35)}

.call{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:46px;
  padding:11px 20px;
  flex:0 0 auto;
  color:#fff;
  text-decoration:none;
  font-size:.95rem;
  border-radius:10px;
  background:linear-gradient(120deg,var(--neon),var(--pink));
  box-shadow:0 0 20px rgba(255,0,110,.55);
  transition:box-shadow .2s,transform .2s;
}
.call .ico{fill:#fff}
.call:hover,.call:focus-visible{transform:translateY(-2px);box-shadow:0 0 30px rgba(255,0,110,.9)}

/* 二级粘性锚点条 */
.railbar{
  position:sticky;
  top:0;
  z-index:40;
  overflow-x:auto;
  scrollbar-width:none;
  background:rgba(18,18,34,.96);
  border-bottom:1px solid var(--edge);
  box-shadow:0 8px 22px rgba(0,0,0,.55);
}
.railbar::-webkit-scrollbar{display:none}
.railbar p{
  margin:0;
  display:flex;
  gap:2px;
  min-width:max-content;
  padding:0 max(10px,calc((100% - var(--wrap)) / 2 + 10px));
}
.rail-a{
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:11px 10px;
  white-space:nowrap;
  color:var(--dim);
  text-decoration:none;
  font-size:.84rem;
  letter-spacing:.04em;
  border-bottom:2px solid transparent;
  transition:color .2s,border-color .2s,text-shadow .2s;
}
.rail-n{font-family:ui-monospace,"Courier New",monospace;font-size:.72rem;color:var(--neon)}
.rail-a:hover,.rail-a:focus-visible{color:#fff;border-bottom-color:var(--pink);text-shadow:0 0 10px var(--pink)}

/* 首屏 */
.hero{
  position:relative;
  z-index:1;
  min-height:70vh;
  display:flex;
  align-items:center;
  overflow:hidden;
  padding:clamp(34px,8vh,84px) clamp(16px,5vw,60px);
  border-bottom:1px solid var(--edge);
  background-image:radial-gradient(circle,rgba(255,0,110,.3) 1.6px,transparent 1.6px);
  background-size:22px 22px;
}
.hero::after{
  content:"";
  position:absolute;
  right:-12%;
  top:-30%;
  width:58%;
  height:170%;
  pointer-events:none;
  transform:skewX(-18deg);
  background:linear-gradient(120deg,rgba(255,0,0,.3),rgba(255,0,110,.04) 72%);
}
.hero-in{position:relative;z-index:2;width:100%;max-width:var(--wrap);margin:0 auto}

.hero h1{
  position:relative;
  margin:0;
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(2.25rem,8vw,6.2rem);
  line-height:1.08;
  letter-spacing:.02em;
  color:#fff;
  text-shadow:0 0 10px rgba(255,0,110,.95),0 0 38px rgba(255,0,0,.6);
}
.hero h1::before,
.hero h1::after{
  content:attr(data-text);
  position:absolute;
  inset:0;
  pointer-events:none;
  text-shadow:none;
  mix-blend-mode:screen;
}
.hero h1::before{color:var(--pink);clip-path:inset(0 0 54% 0);animation:glitch-a 4.2s infinite steps(2,end)}
.hero h1::after{color:var(--cyan);clip-path:inset(46% 0 0 0);animation:glitch-b 3.6s infinite steps(2,end)}

@keyframes glitch-a{
  0%,86%,100%{transform:translate(0,0)}
  88%{transform:translate(-4px,-2px) skewX(-9deg)}
  92%{transform:translate(3px,1px) skewX(7deg)}
  96%{transform:translate(-2px,0) skewX(-3deg)}
}
@keyframes glitch-b{
  0%,82%,100%{transform:translate(0,0)}
  85%{transform:translate(4px,2px) skewX(8deg)}
  90%{transform:translate(-3px,-1px) skewX(-6deg)}
  95%{transform:translate(2px,1px) skewX(4deg)}
}

/* 主体 */
main{position:relative;z-index:1}

.wrap{
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(22px,5vw,52px) max(14px,calc((100vw - var(--wrap)) / 2 * 0 + 14px));
  padding-left:clamp(14px,4vw,40px);
  padding-right:clamp(14px,4vw,40px);
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  gap:clamp(20px,3vw,44px);
  align-items:start;
}

/* 左栏 */
.side{
  position:sticky;
  top:64px;
  padding:18px 14px;
  border-radius:10px;
  background:var(--ink-c);
}
.kicker{
  display:block;
  margin:0 0 .4em;
  font-size:.72rem;
  letter-spacing:.34em;
  color:var(--pink);
  text-shadow:0 0 12px rgba(255,0,110,.8);
  font-weight:400;
}
.side-h{
  margin:0 0 14px;
  font-family:var(--serif);
  font-size:1.16rem;
  font-weight:600;
  letter-spacing:.05em;
  color:#fff;
}
.side-list{display:grid;gap:2px}
.side-a{
  display:block;
  min-height:40px;
  padding:9px 10px;
  color:var(--dim);
  text-decoration:none;
  font-size:.92rem;
  border-radius:8px;
  border-left:2px solid transparent;
  animation:rise .55s both;
  animation-delay:calc(var(--i,0) * 45ms);
  transition:color .18s,background .18s,border-color .18s;
}
.side-a:hover,.side-a:focus-visible{color:#fff;background:rgba(255,0,110,.15);border-left-color:var(--pink)}

@keyframes rise{from{opacity:0;transform:translate(0,10px)}to{opacity:1;transform:none}}

/* 正文 */
.stage{min-width:0}

.body{font-size:1.03rem}
.body > section{
  background:var(--ink-c);
  border-radius:10px;
  padding:clamp(18px,3vw,32px);
  margin:0 0 clamp(16px,3vw,26px);
  scroll-margin-top:84px;
}
.body > section:last-child{margin-bottom:0}

.body small{
  display:block;
  margin:0 0 .45em;
  font-size:.73rem;
  letter-spacing:.3em;
  color:var(--pink);
  text-shadow:0 0 12px rgba(255,0,110,.75);
  font-weight:400;
}
.body h2{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(1.32rem,3.4vw,1.85rem);
  line-height:1.36;
  margin:0 0 .65em;
  color:#fff;
  letter-spacing:.02em;
  text-shadow:0 0 16px rgba(255,0,110,.55);
}
.body h3{
  font-family:var(--serif);
  font-size:1.14rem;
  font-weight:600;
  margin:1.5em 0 .5em;
  color:#ffd9e6;
}
.body p{margin:0 0 1em}
.body p:last-child{margin-bottom:0}
.body ul,.body ol{padding-left:1.35em;margin:0 0 1em}
.body li{margin:.35em 0}
.body li::marker{color:var(--pink)}
.body strong{color:#fff;font-weight:500}
.body a{color:#ff5d8f;text-decoration:none;border-bottom:1px solid rgba(255,0,110,.55)}
.body a:hover,.body a:focus-visible{color:#fff;border-bottom-color:#fff}
.body blockquote{
  margin:1.2em 0;
  padding:.5em 0 .5em 1em;
  border-left:3px solid var(--pink);
  background:rgba(255,0,110,.08);
  border-radius:0 8px 8px 0;
  color:#ffd9e6;
}

/* 页脚 */
.foot{
  position:relative;
  z-index:1;
  margin-top:clamp(30px,6vw,72px);
  padding:clamp(30px,5vw,60px) max(14px,calc((100% - var(--wrap)) / 2 + 20px)) 16px;
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:clamp(18px,3vw,34px);
  border-top:1px solid var(--edge);
  background:linear-gradient(180deg,rgba(255,0,110,.08),rgba(18,18,34,.92));
}
.foot h3{
  margin:0 0 10px;
  font-size:.86rem;
  font-weight:500;
  letter-spacing:.24em;
  color:var(--pink);
}
.cta-h{
  margin:.05em 0 .55em;
  font-family:var(--serif);
  font-size:clamp(1.65rem,4.4vw,2.45rem);
  line-height:1.2;
  color:#fff;
  text-shadow:0 0 18px rgba(255,0,110,.85);
}
.cta-btn{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:12px 22px;
  color:#fff;
  text-decoration:none;
  font-size:.95rem;
  border-radius:10px;
  background:linear-gradient(120deg,var(--neon),var(--pink));
  box-shadow:0 0 22px rgba(255,0,110,.55);
  transition:box-shadow .2s,transform .2s;
}
.cta-btn:hover,.cta-btn:focus-visible{transform:translateY(-2px);box-shadow:0 0 32px rgba(255,0,110,.95)}
.foot-link{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 0;
  color:var(--dim);
  text-decoration:none;
  font-size:.92rem;
  transition:color .18s,text-shadow .18s;
}
.foot-link:hover,.foot-link:focus-visible{color:#fff;text-shadow:0 0 10px var(--pink)}
.foot-note{margin:0 0 6px;color:var(--dim);font-size:.92rem}
.foot-base{
  grid-column:1 / -1;
  margin-top:10px;
  padding-top:14px;
  border-top:1px solid var(--edge);
  text-align:center;
  color:var(--dim);
  font-size:.82rem;
  letter-spacing:.06em;
}

.hook{position:relative;z-index:1}

/* 断点 */
@media (max-width:980px){
  .wrap{grid-template-columns:200px minmax(0,1fr)}
  .navlink{font-size:.9rem;padding:10px 8px}
}

@media (max-width:880px){
  .wrap{grid-template-columns:minmax(0,1fr)}
  .side{position:static;order:2}
  .hero{min-height:54vh}
  .foot{grid-template-columns:1fr 1fr}
}

@media (max-width:640px){
  .top{flex-wrap:wrap;gap:10px}
  .nav{order:3;flex:1 0 100%}
  .call{order:2;margin-left:auto;padding:10px 15px;font-size:.9rem}
  .navlink{padding:10px 7px;font-size:.87rem;gap:5px}
  .rail-a{font-size:.8rem;padding:10px 8px}
}

@media (max-width:420px){
  body{font-size:16.5px}
  .foot{grid-template-columns:1fr}
  .hero h1{letter-spacing:.01em}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}

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