:root{
  --ink:#192617;
  --ink-2:#0d150e;
  --neon:#87ff71;
  --cyan:#01cdfe;
  --pink:#ff71ce;
  --violet:#b967ff;
  --fg:#e9fbdf;
  --dim:#a7c6a0;
  --line:rgba(135,255,113,.26);
  --glass:rgba(20,34,20,.55);
  --max:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:'Chakra Petch',system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',sans-serif;
  font-size:17px;
  line-height:1.8;
  color:var(--fg);
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 520px at 50% -6%,rgba(255,113,206,.42),transparent 63%),
    radial-gradient(880px 480px at 84% 2%,rgba(185,103,255,.36),transparent 64%),
    radial-gradient(920px 640px at 8% 12%,rgba(1,205,254,.22),transparent 60%);
  background-repeat:no-repeat;
  overflow-x:hidden;
}
body.open{overflow:hidden}
body::after{
  content:'';position:fixed;inset:0;z-index:90;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,.18) 0 1px,transparent 1px 3px);
  opacity:.5;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan)}
p{margin:0 0 1em}
h1,h2,h3{line-height:1.3}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* 顶栏 */
.top{position:relative}
.bar{
  position:fixed;inset:0 0 auto;z-index:60;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:10px clamp(14px,4vw,40px);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(11,19,11,.94),rgba(11,19,11,.55));
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
body.open .bar{background:rgba(11,19,11,.98)}
.brand{
  display:inline-flex;align-items:center;gap:11px;min-height:44px;
  text-decoration:none;color:var(--fg);
  font-family:'Russo One',sans-serif;letter-spacing:.1em;font-size:1.02rem;
}
.mark{
  width:32px;height:32px;flex:none;border-radius:4px;
  background:linear-gradient(155deg,var(--pink),var(--violet) 48%,var(--cyan));
  box-shadow:0 0 18px rgba(1,205,254,.55);
}
img.mark{object-fit:cover}
.burger{
  display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:8px 15px;
  font:inherit;font-size:.95rem;line-height:1;color:var(--neon);
  background:rgba(135,255,113,.08);border:1px solid var(--line);border-radius:4px;cursor:pointer;
}
.burger:hover{background:rgba(135,255,113,.16)}
.burger-box{
  width:20px;height:2px;background:currentColor;
  box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor;
  transition:transform .2s ease,opacity .2s ease;
}
body.open .burger-box{transform:rotate(90deg);opacity:.8}

/* 全屏菜单 */
.nav{
  position:fixed;inset:0;z-index:50;
  display:flex;flex-direction:column;justify-content:center;gap:24px;
  padding:92px clamp(16px,5vw,48px) 36px;
  background:
    radial-gradient(760px 420px at 50% 4%,rgba(255,113,206,.22),transparent 62%),
    rgba(9,16,9,.95);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  opacity:0;visibility:hidden;
  transition:opacity .26s ease,visibility .26s ease;
  overflow-y:auto;
}
body.open .nav{opacity:1;visibility:visible}
.finder{width:100%;max-width:540px;margin:0 auto}
.finder input{
  width:100%;min-height:46px;padding:11px 14px;
  font:inherit;font-size:16px;color:var(--fg);
  background:rgba(135,255,113,.07);border:1px solid var(--line);border-radius:4px;
}
.finder input::placeholder{color:var(--dim)}
.nav ol{
  list-style:none;margin:0 auto;padding:0;width:100%;max-width:540px;
  display:grid;gap:4px;
}
.nav a{
  display:flex;align-items:center;gap:14px;min-height:48px;padding:8px 10px;
  border-left:2px solid transparent;border-radius:4px;
  text-decoration:none;color:var(--fg);font-size:1.15rem;
  transition:color .18s ease,background .18s ease,border-color .18s ease;
}
.nav a:hover,.nav a:focus-visible{
  color:var(--neon);background:rgba(135,255,113,.1);border-left-color:var(--neon);
}
.no{font-family:'Russo One',sans-serif;font-size:.72rem;letter-spacing:.14em;color:var(--cyan);min-width:1.9em}
.nav li[hidden]{display:none}

/* 主区 */
main{padding-top:66px}
.hero{
  position:relative;isolation:isolate;
  min-height:70vh;display:grid;place-items:center;
  padding:60px clamp(16px,5vw,48px) 96px;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(620px 300px at 50% 118%,rgba(1,205,254,.34),transparent 70%),
    linear-gradient(180deg,rgba(255,113,206,.22),rgba(185,103,255,.14) 42%,transparent 78%);
}
.hero::after{
  content:'';position:absolute;left:-10%;right:-10%;bottom:0;height:120px;
  background:
    repeating-linear-gradient(90deg,rgba(135,255,113,.55) 0 1px,transparent 1px 58px),
    repeating-linear-gradient(0deg,rgba(1,205,254,.45) 0 1px,transparent 1px 26px);
  transform:perspective(320px) rotateX(64deg);transform-origin:bottom;opacity:.6;
}
.hero-copy{position:relative;z-index:2;max-width:760px;text-align:center}
.hero h1{
  margin:0;font-family:'Russo One',sans-serif;
  font-size:clamp(2rem,7.4vw,4.4rem);letter-spacing:.03em;line-height:1.12;color:#f4ffee;
  text-shadow:0 0 12px rgba(135,255,113,.6),0 0 44px rgba(1,205,254,.45),0 0 74px rgba(255,113,206,.35);
}
.lede{margin:20px auto 0;max-width:56ch;color:#d3ecc9;font-size:1.05rem}
.badge{
  position:absolute;z-index:3;top:16%;right:clamp(12px,7vw,84px);
  padding:8px 14px;border:1px solid var(--line);border-radius:4px;
  background:rgba(1,205,254,.14);color:var(--neon);
  font-family:'Russo One',sans-serif;font-size:.78rem;letter-spacing:.16em;
  box-shadow:0 0 22px rgba(1,205,254,.35);
  animation:drift 6s ease-in-out infinite;
}
@keyframes drift{50%{transform:translateY(-9px)}}
.collage{position:absolute;inset:0;z-index:1;margin:0;pointer-events:none}
.collage-img{
  position:absolute;width:min(30%,280px);object-fit:cover;
  border:1px solid var(--line);border-radius:4px;
  box-shadow:0 0 26px rgba(1,205,254,.4);
  filter:saturate(1.1);
}
.c1{top:11%;left:3%;transform:rotate(-6deg)}
.c2{bottom:12%;right:3%;transform:rotate(5deg)}

/* 侧栏 + 正文 */
.deck{
  display:grid;grid-template-columns:230px minmax(0,1fr);gap:32px;
  max-width:var(--max);margin:0 auto;padding:8px clamp(16px,4vw,40px) 64px;
}
.rail{
  align-self:start;position:sticky;top:84px;padding:16px;
  border:1px solid var(--line);border-radius:4px;background:var(--glass);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.rail h2{margin:0;font-family:'Russo One',sans-serif;font-size:.92rem;letter-spacing:.18em;color:var(--cyan)}
.rail hr{
  border:0;height:2px;margin:10px 0 14px;
  background:linear-gradient(90deg,var(--neon),var(--cyan) 55%,transparent);
}
.rail ol{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.rail a{
  display:flex;align-items:center;min-height:40px;padding:7px 10px;
  border-left:2px solid transparent;border-radius:4px;
  color:var(--fg);text-decoration:none;font-size:.94rem;
}
.rail a:hover,.rail a:focus-visible{
  color:var(--neon);background:rgba(135,255,113,.1);border-left-color:var(--neon);
}
.flow{min-width:0}
.flow section{
  position:relative;margin:0 0 22px;padding:clamp(18px,3vw,34px);
  border:1px solid var(--line);border-radius:4px;background:var(--glass);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  scroll-margin-top:88px;
}
.flow section::before{
  content:'';position:absolute;left:0;top:0;width:44px;height:2px;
  background:linear-gradient(90deg,var(--neon),var(--cyan));
}
.flow section>:first-child{margin-top:0}
.flow h2{
  font-family:'Russo One',sans-serif;font-size:clamp(1.3rem,3.2vw,1.75rem);
  letter-spacing:.02em;color:var(--neon);margin:0 0 10px;
  text-shadow:0 0 16px rgba(135,255,113,.3);
}
.flow h3{font-family:'Russo One',sans-serif;font-size:1.1rem;color:var(--cyan);margin:22px 0 8px;letter-spacing:.02em}
.flow ul,.flow ol{padding-left:1.3em}
.flow li{margin:.25em 0}
.flow a{color:var(--cyan)}
.flow blockquote{
  margin:18px 0;padding:12px 18px;
  border-left:3px solid var(--violet);background:rgba(185,103,255,.1);
}
.flow figure{margin:18px 0}
.flow figcaption{font-size:.9rem;color:var(--dim)}
.flow table{width:100%;border-collapse:collapse;font-size:.95rem}
.flow th,.flow td{border:1px solid var(--line);padding:8px 10px;text-align:left}

/* 页脚 */
.foot{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(25,38,23,.5),rgba(10,18,10,.92));
  padding:clamp(28px,5vw,48px) clamp(16px,4vw,40px) 20px;
}
.foot-grid{
  max-width:var(--max);margin:0 auto;
  display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:28px;
}
address{font-style:normal}
.foot-brand strong{
  display:block;margin-bottom:8px;
  font-family:'Russo One',sans-serif;font-size:1.1rem;letter-spacing:.08em;color:var(--neon);
}
.foot-brand p{margin:0;color:var(--dim);font-size:.95rem}
.foot-links{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:1fr 1fr;gap:2px;
}
.foot-links a{
  display:flex;align-items:center;min-height:40px;padding:6px 0;
  color:var(--fg);text-decoration:none;font-size:.95rem;
}
.foot-links a:hover{color:var(--neon)}
.foot-base{
  max-width:var(--max);margin:26px auto 0;padding-top:14px;
  border-top:1px solid rgba(135,255,113,.14);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;
  font-size:.9rem;color:var(--dim);
}
.copy{margin:0}
.totop{display:inline-flex;align-items:center;min-height:40px;padding:8px 0;color:var(--cyan);text-decoration:none}

/* 入场 */
.js .rv{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.js .rv.in{opacity:1;transform:none}

@media (max-width:880px){
  .deck{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;order:-1}
  .collage-img{width:min(42%,200px);opacity:.65}
  .badge{top:12%;right:14px;font-size:.7rem;padding:6px 10px}
}
@media (max-width:620px){
  main{padding-top:62px}
  .hero{min-height:68vh;padding-top:44px;padding-bottom:88px}
  .hero h1{font-size:clamp(1.75rem,8.6vw,2.4rem)}
  .lede{font-size:1rem}
  .c1{top:8%;left:2%}
  .c2{bottom:9%;right:2%}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .badge{animation:none}
  .js .rv{opacity:1;transform:none;transition:none}
}

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