:root{
  --bg-deep:#0a0a1a;
  --bg-panel:#12122b;
  --bg-panel-2:#171735;
  --line:rgba(120,140,255,.22);
  --cyan:#38f0e0;
  --violet:#a06bff;
  --acid:#f4ff54;
  --text:#eef0ff;
  --muted:#9aa0c8;
  --radius:18px;
  --pad:22px;
  --space:clamp(56px,8vw,96px);
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--bg-deep);
  color:var(--text);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  line-height:1.75;
  overflow-x:hidden;
}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
::-webkit-scrollbar{width:8px;height:8px;}
::-webkit-scrollbar-track{background:#080812;}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--cyan),var(--violet));border-radius:8px;}
::selection{background:var(--violet);color:#fff;}

/* --- progress bar --- */
#progress{
  position:fixed;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--violet),var(--acid));
  z-index:999;box-shadow:0 0 10px var(--cyan);
}

/* --- nav --- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:900;
  display:flex;align-items:center;justify-content:space-between;
  padding:12px clamp(16px,4vw,42px);
  transition:background .3s,backdrop-filter .3s,border-color .3s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(10,10,26,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.02rem;letter-spacing:.5px;}
.brand img{height:32px;width:auto;border-radius:8px;}
.navlinks{display:flex;gap:20px;font-size:.86rem;color:var(--muted);}
.navlinks a{transition:color .2s;}
.navlinks a:hover,.navlinks a.active{color:var(--cyan);}
.nav-cta{
  padding:8px 18px;border-radius:999px;font-size:.84rem;font-weight:600;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  color:#0a0a1a;white-space:nowrap;
}
@media(max-width:768px){.navlinks{display:none;}}

/* --- layout --- */
.wrap{max-width:1180px;margin:0 auto;padding:0 clamp(16px,4vw,32px);}
section{position:relative;padding:var(--space) 0;}
.sec-head{
  display:flex;align-items:center;gap:14px;margin-bottom:34px;
}
.sec-num{
  font-family:"Courier New",monospace;font-weight:700;font-size:.82rem;
  color:var(--acid);border:1px solid rgba(244,255,84,.35);
  border-radius:8px;padding:3px 9px;letter-spacing:1px;
  background:rgba(244,255,84,.06);
}
.sec-title{font-size:clamp(1.25rem,2.6vw,1.7rem);font-weight:800;letter-spacing:.5px;}
.alt{background:linear-gradient(180deg,#12122b,#0d0d21);}
.grid-bg{
  background-image:linear-gradient(rgba(120,140,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(120,140,255,.07) 1px,transparent 1px);
  background-size:44px 44px;
}
.dot-bg{
  background-image:radial-gradient(rgba(160,107,255,.16) 1px,transparent 1px);
  background-size:22px 22px;
}
.divider{height:1px;background:linear-gradient(90deg,transparent,var(--cyan),var(--violet),transparent);opacity:.55;}

/* --- hero --- */
.hero{
  min-height:100vh;display:flex;align-items:center;
  padding-top:100px;padding-bottom:60px;
}
.hero-card{
  width:100%;border:1px solid var(--line);border-radius:26px;
  padding:clamp(24px,4vw,52px);
  background:
    radial-gradient(circle at 80% 20%,rgba(160,107,255,.22),transparent 55%),
    radial-gradient(circle at 10% 90%,rgba(56,240,224,.14),transparent 50%),
    #0e0e22;
  position:relative;overflow:hidden;
}
.hero-card::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(56,240,224,.18) 1px,transparent 1px);
  background-size:26px 26px;opacity:.5;
  animation:drift 14s linear infinite;
}
@keyframes drift{to{background-position:0 260px;}}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(24px,4vw,52px);align-items:center;position:relative;z-index:2;}
.hero h1{
  font-size:clamp(1.9rem,4.6vw,3.1rem);line-height:1.28;font-weight:900;letter-spacing:1px;
  background:linear-gradient(100deg,#fff 10%,var(--cyan) 55%,var(--violet) 95%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{margin-top:18px;color:var(--muted);font-size:clamp(.94rem,1.6vw,1.06rem);max-width:32em;}
.ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px;}
.btn{
  display:inline-block;padding:13px 26px;border-radius:12px;font-weight:700;font-size:.95rem;
  transition:transform .25s,box-shadow .25s;
}
.btn-main{
  background:linear-gradient(90deg,var(--cyan),var(--violet));color:#08081a;
  box-shadow:0 8px 26px rgba(80,120,255,.28);
}
.btn-main:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(80,120,255,.45);}
.btn-ghost{border:1px solid var(--line);color:var(--text);background:rgba(255,255,255,.03);}
.btn-ghost:hover{border-color:var(--cyan);transform:translateY(-3px);}
.frames{position:relative;height:340px;}
.frame{
  position:absolute;border-radius:16px;overflow:hidden;border:1px solid rgba(120,140,255,.4);
  box-shadow:0 18px 44px rgba(0,0,0,.55);
}
.frame img{width:100%;height:100%;object-fit:cover;}
.frame-1{width:56%;height:78%;top:0;right:0;animation:float 7s ease-in-out infinite;}
.frame-2{width:46%;height:64%;bottom:0;left:0;animation:float 8.5s ease-in-out infinite reverse;}
@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-14px);}}
.tag-ai{
  position:absolute;z-index:3;font-size:.68rem;letter-spacing:1px;
  padding:2px 8px;border-radius:6px;background:rgba(56,240,224,.16);
  color:var(--cyan);border:1px solid rgba(56,240,224,.4);
}
.bubble{
  margin-top:26px;display:inline-flex;align-items:center;gap:10px;
  border:1px solid var(--line);border-radius:14px;padding:10px 16px;font-size:.82rem;
  background:rgba(18,18,43,.85);color:var(--muted);
}
.bubble b{color:var(--acid);font-weight:700;}
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .frames{height:300px;margin-top:12px;}
}

/* --- sections shared cards --- */
.cards{display:grid;gap:18px;}
.card{
  border:1px solid var(--line);border-radius:var(--radius);padding:var(--pad);
  background:linear-gradient(170deg,rgba(27,27,58,.9),rgba(15,15,34,.9));
  transition:transform .3s,border-color .3s,box-shadow .3s;
}
.card:hover{transform:translateY(-4px);border-color:rgba(56,240,224,.5);box-shadow:0 14px 36px rgba(0,0,0,.4);}
.card h3{font-size:1.02rem;font-weight:700;margin-bottom:8px;color:var(--cyan);}
.card p{color:var(--muted);font-size:.9rem;}

/* 02 steps */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;}
.step{
  border:1px solid var(--line);border-radius:16px;padding:16px;text-align:center;
  background:rgba(18,18,43,.8);
}
.step-num{font-family:"Courier New",monospace;color:var(--acid);font-size:.78rem;letter-spacing:1px;}
.step h3{font-size:.95rem;margin:8px 0 6px;}
.step p{font-size:.8rem;color:var(--muted);}
@media(max-width:1024px){.steps{grid-template-columns:repeat(3,1fr);}}
@media(max-width:768px){.steps{grid-template-columns:1fr 1fr;}}

/* 03/04 posters */
.poster-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.poster{
  border:1px solid var(--line);border-radius:14px;overflow:hidden;position:relative;
  background:#0d0d21;transition:transform .3s,border-color .3s;
}
.poster:hover{transform:scale(1.03);border-color:rgba(160,107,255,.6);}
.poster img{width:100%;aspect-ratio:3/4.2;object-fit:cover;transition:transform .4s;}
.poster:hover img{transform:scale(1.06);}
.poster-cap{padding:10px 12px;font-size:.82rem;color:var(--muted);border-top:1px solid var(--line);}
.poster-cap strong{display:block;color:var(--text);font-size:.88rem;margin-bottom:2px;}
@media(max-width:1024px){.poster-grid{grid-template-columns:repeat(3,1fr);}}
@media(max-width:768px){.poster-grid{grid-template-columns:1fr 1fr;gap:12px;}}

/* 05 collaboration */
.pair{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,36px);align-items:center;margin-bottom:40px;}
.pair img{border-radius:16px;border:1px solid var(--line);width:100%;object-fit:cover;}
.pair.odd .pair-txt{order:-1;}
.pair-txt h3{font-size:1.1rem;margin-bottom:10px;color:var(--cyan);}
.pair-txt p{color:var(--muted);font-size:.92rem;}
@media(max-width:768px){.pair{grid-template-columns:1fr;}.pair.odd .pair-txt{order:0;}}

/* 06 showcase */
.showcase{
  border:1px solid var(--line);border-radius:20px;padding:clamp(16px,3vw,30px);
  background:rgba(13,13,33,.9);
}
.show-track{position:relative;min-height:300px;}
.slide{display:none;grid-template-columns:1fr 1fr;gap:24px;align-items:center;}
.slide.on{display:grid;animation:fadeUp .6s ease;}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:translateY(0);}}
.slide img{border-radius:14px;border:1px solid var(--line);width:100%;object-fit:cover;max-height:360px;}
.slide-txt h3{font-size:1.2rem;margin-bottom:10px;}
.slide-txt p{color:var(--muted);font-size:.92rem;margin-bottom:14px;}
.dots{display:flex;gap:9px;justify-content:center;margin-top:22px;}
.dot{width:8px;height:8px;border-radius:50%;background:rgba(120,140,255,.35);border:0;cursor:pointer;padding:0;}
.dot.on{background:var(--cyan);box-shadow:0 0 10px var(--cyan);}
@media(max-width:768px){.slide{grid-template-columns:1fr;}}

/* 07 numbers */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.stat{border:1px solid var(--line);border-radius:14px;padding:22px 18px;text-align:center;background:rgba(24,24,52,.8);}
.stat b{display:block;font-size:1.6rem;color:var(--acid);font-weight:800;}
.stat span{font-size:.82rem;color:var(--muted);}
@media(max-width:768px){.stats{grid-template-columns:1fr 1fr;}}

/* 08 reviews / marquee */
.marquee{overflow:hidden;position:relative;}
.marquee-row{display:flex;gap:16px;width:max-content;animation:scrollX 34s linear infinite;}
.marquee-row.reverse{animation-direction:reverse;margin-top:16px;animation-duration:40s;}
.marquee:hover .marquee-row{animation-play-state:paused;}
@keyframes scrollX{from{transform:translateX(0);}to{transform:translateX(-50%);}}
.review{
  width:270px;flex:0 0 auto;border:1px solid var(--line);border-radius:14px;padding:16px;
  background:rgba(18,18,43,.85);
}
.review b{font-size:.86rem;color:var(--cyan);}
.review p{font-size:.84rem;color:var(--muted);margin-top:6px;}

/* 09 prompts */
.prompt-band{display:flex;gap:16px;overflow-x:auto;padding-bottom:12px;scroll-snap-type:x mandatory;}
.prompt{
  flex:0 0 260px;scroll-snap-align:start;border:1px solid var(--line);border-radius:14px;
  overflow:hidden;background:rgba(18,18,43,.85);
}
.prompt img{width:100%;aspect-ratio:3/4;object-fit:cover;}
.prompt-cap{padding:12px 14px;font-size:.82rem;color:var(--muted);}
.prompt-cap strong{display:block;color:var(--text);font-size:.88rem;margin-bottom:2px;}

/* 10 schedule */
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.item{border:1px solid var(--line);border-radius:14px;padding:18px;background:rgba(18,18,43,.85);}
.item time{font-size:.78rem;color:var(--acid);letter-spacing:.5px;}
.item h3{font-size:.98rem;margin:8px 0 6px;}
.item p{font-size:.82rem;color:var(--muted);}
@media(max-width:768px){.timeline{grid-template-columns:1fr;}}

/* 11 faq */
.faq{border:1px solid var(--line);border-radius:14px;margin-bottom:14px;background:rgba(18,18,43,.8);overflow:hidden;}
.faq summary{
  cursor:pointer;list-style:none;padding:16px 20px;font-weight:600;font-size:.95rem;
  display:flex;justify-content:space-between;align-items:center;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";color:var(--cyan);font-size:1.2rem;transition:transform .3s;}
.faq[open] summary::after{transform:rotate(45deg);}
.faq p{padding:0 20px 18px;color:var(--muted);font-size:.9rem;}

/* 12 cta */
.cta-band{
  border-radius:24px;padding:clamp(28px,5vw,56px);text-align:center;position:relative;overflow:hidden;
  background:linear-gradient(120deg,rgba(56,240,224,.16),rgba(160,107,255,.24));
  border:1px solid var(--line);
}
.cta-band h2{font-size:clamp(1.3rem,3vw,1.9rem);margin-bottom:12px;}
.cta-band p{color:var(--muted);font-size:.94rem;max-width:36em;margin:0 auto 26px;}

/* footer */
.footer{padding:48px 0 30px;border-top:1px solid var(--line);background:#080814;}
.foot-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin-bottom:34px;}
.foot-cols h4{font-size:.88rem;margin-bottom:10px;color:var(--text);}
.foot-cols p,.foot-cols a{display:block;font-size:.82rem;color:var(--muted);margin-bottom:6px;transition:color .2s;}
.foot-cols a:hover{color:var(--cyan);}
.foot-bottom{font-size:.76rem;color:#6b7099;display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;}
.foot-bottom a{color:#6b7099;text-decoration:underline;}
.foot-bottom a:hover{color:var(--cyan);}
@media(max-width:768px){.foot-cols{grid-template-columns:1fr 1fr;}}

/* floating helper */
.fab{
  position:fixed;right:20px;bottom:24px;z-index:950;
  width:54px;height:54px;border-radius:50%;border:1px solid rgba(56,240,224,.5);
  background:linear-gradient(135deg,var(--cyan),var(--violet));color:#08081a;
  font-weight:800;font-size:.78rem;cursor:pointer;
  box-shadow:0 8px 26px rgba(56,240,224,.35);
}
.panel{
  position:fixed;right:20px;bottom:90px;z-index:951;width:280px;
  border:1px solid var(--line);border-radius:16px;padding:18px;
  background:rgba(20,20,46,.94);backdrop-filter:blur(12px);
  transform:scale(.9);opacity:0;pointer-events:none;transition:.28s;
}
.panel.open{transform:scale(1);opacity:1;pointer-events:auto;}
.panel h3{font-size:.95rem;margin-bottom:8px;color:var(--cyan);}
.panel p{font-size:.82rem;color:var(--muted);margin-bottom:12px;}
.panel input,.panel textarea{
  width:100%;border:1px solid var(--line);border-radius:8px;background:#0d0d21;color:var(--text);
  padding:8px 10px;font-size:.82rem;font-family:inherit;margin-bottom:10px;
}
.panel button{
  width:100%;padding:9px;border-radius:8px;border:0;cursor:pointer;font-weight:700;
  background:linear-gradient(90deg,var(--cyan),var(--violet));color:#08081a;font-size:.84rem;
}

/* reveal */
.reveal{transition:opacity .7s ease,transform .7s ease;}
.reveal.is-in{opacity:1;transform:none;}
@media(prefers-reduced-motion:reduce){
  .frame-1,.frame-2,.marquee-row,.hero-card::after{animation:none !important;}
  .reveal{transition:none;}
}