:root{
  --bg:#0a0a0a; --panel:#141414; --panel2:#1b1b1b; --line:#2a2a2a;
  --red:#e10600; --red-d:#8f0400; --txt:#f5f2ec; --mut:#a49e93; --gold:#c9a35f;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",Inter,system-ui,sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img,video{display:block;max-width:100%}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
/* top bar */
.topbar{position:sticky;top:0;z-index:50;background:rgba(10,10,10,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;gap:18px;height:60px}
.logo{font-weight:900;letter-spacing:.06em;font-size:20px}
.logo b{color:var(--red)}
.logo small{display:block;font-size:10px;letter-spacing:.28em;color:var(--mut);font-weight:600}
nav.main{margin-left:auto;display:flex;gap:22px;font-size:14px;color:var(--mut)}
nav.main a:hover{color:var(--txt)}
.langbtn{border:1px solid var(--line);background:var(--panel);color:var(--txt);border-radius:999px;padding:6px 14px;font-size:13px;cursor:pointer}
.langbtn b{color:var(--red)}
.cta-sm{background:var(--red);color:#fff;border-radius:999px;padding:8px 18px;font-weight:700;font-size:14px}
/* hero */
.hero{position:relative;padding:110px 0 90px;overflow:hidden}
.hero .bgcmp{position:absolute;inset:0;display:flex}
.hero .bgcmp figure{flex:1;background-size:cover;background-position:center;filter:grayscale(.35) brightness(.5)}
.hero .bgcmp .now{border-left:3px solid var(--red)}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,10,10,.55),rgba(10,10,10,.88) 78%)}
.hero .wrap{position:relative;z-index:2}
/* flame ambience (Shen 2026-10-30): ember canvas + hero fire-glow pulse */
#fx-embers{position:fixed;inset:0;z-index:60;pointer-events:none;mix-blend-mode:screen}
@keyframes heroFlame{0%,100%{box-shadow:inset 0 -90px 80px -50px rgba(255,94,0,.20),inset 0 -26px 46px -10px rgba(225,6,0,.16)}50%{box-shadow:inset 0 -135px 105px -50px rgba(255,94,0,.34),inset 0 -42px 62px -10px rgba(225,6,0,.26)}}
.hero{animation:heroFlame 3.6s ease-in-out infinite}
@media (prefers-reduced-motion:reduce){.hero{animation:none}}
.kicker{color:var(--red);font-weight:800;letter-spacing:.24em;font-size:13px;text-transform:uppercase}
.hero h1{font-size:clamp(38px,6.4vw,68px);line-height:1.14;font-weight:900;margin:18px 0 20px;max-width:820px}
.hero h1 .r{color:var(--red)}
.hero p.sub{font-size:clamp(16px,2.2vw,20px);color:#d8d2c6;max-width:640px}
.hero .row{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn{display:inline-block;border-radius:999px;padding:14px 30px;font-weight:800;font-size:16px}
.btn.red{background:var(--red);color:#fff}
.btn.ghost{border:1px solid #4a4a4a;color:var(--txt)}
.hero .tags{margin-top:44px;display:flex;gap:10px;flex-wrap:wrap}
.hero .tags span{border:1px solid var(--line);background:rgba(20,20,20,.75);border-radius:999px;padding:6px 14px;font-size:13px;color:var(--mut)}
.hero .tags b{color:var(--txt)}
/* sections */
section{padding:84px 0}
.sec-k{color:var(--red);font-weight:800;letter-spacing:.22em;font-size:12px;text-transform:uppercase}
h2{font-size:clamp(28px,4.4vw,44px);font-weight:900;line-height:1.25;margin:12px 0 14px}
.lede{color:var(--mut);max-width:680px;font-size:17px}
/* before-after compare */
.cmp{position:relative;border-radius:18px;overflow:hidden;border:1px solid var(--line);margin-top:36px;aspect-ratio:16/8.2;background:#000}
.cmp img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cmp .after{clip-path:inset(0 0 0 var(--pos,50%))}
.cmp input[type=range]{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:ew-resize;z-index:5}
.cmp .bar{position:absolute;top:0;bottom:0;left:var(--pos,50%);width:3px;background:var(--red);z-index:4;transform:translateX(-50%)}
.cmp .bar::after{content:"◂ ▸";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--red);color:#fff;font-size:12px;padding:8px 10px;border-radius:999px;white-space:nowrap}
.cmp .lab{position:absolute;top:16px;z-index:3;background:rgba(0,0,0,.65);padding:6px 14px;border-radius:999px;font-size:13px;font-weight:700;letter-spacing:.12em}
.cmp .lab.b{left:16px}.cmp .lab.a{right:16px;color:#ffb3ae}
/* cycle */
.cycle{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}
.step{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px}
.step .n{font-size:42px;font-weight:900;color:var(--red);line-height:1}
.step h3{font-size:20px;margin:12px 0 8px}
.step p{color:var(--mut);font-size:15px}
.arrow{align-self:center;text-align:center;color:var(--red);font-size:26px}
/* pricing */
.prices{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px;align-items:stretch}
.price{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:32px 28px;display:flex;flex-direction:column}
.price.hot{border-color:var(--red);background:linear-gradient(180deg,#1d0a09,var(--panel) 55%);position:relative}
.price .badge{position:absolute;top:-14px;left:28px;background:var(--red);color:#fff;font-size:12px;font-weight:800;letter-spacing:.14em;padding:5px 14px;border-radius:999px}
.price .tier{color:var(--mut);font-weight:700;letter-spacing:.18em;font-size:12px}
.price .amt{font-size:46px;font-weight:900;margin:10px 0 2px}
.price .amt small{font-size:16px;color:var(--mut);font-weight:600}
.price .who{color:var(--gold);font-size:14px;margin-bottom:16px}
.price ul{list-style:none;display:grid;gap:10px;font-size:15px;color:#ddd6c9;flex:1}
.price ul li::before{content:"✓ ";color:var(--red);font-weight:900}
.price ul li.no::before{content:"— ";color:var(--mut)}
.price ul li.no{color:var(--mut)}
.price .btn{margin-top:26px;text-align:center}
/* library grid */
.libgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:34px}
.tile{border-radius:14px;overflow:hidden;border:1px solid var(--line);background:var(--panel);position:relative}
.tile video{width:100%;aspect-ratio:3/4;object-fit:cover}
.tile figcaption{padding:10px 12px;font-size:14px;font-weight:700;display:flex;justify-content:space-between;gap:8px}
.tile figcaption span{color:var(--red);font-size:11px;letter-spacing:.14em;font-weight:800;padding-top:3px}
.libcats{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.libcats a{border:1px solid var(--line);border-radius:999px;padding:8px 18px;font-size:14px;color:var(--mut)}
.libcats a:hover{border-color:var(--red);color:var(--txt)}
/* dual entry */
.dual{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:40px}
.dcard{border-radius:18px;padding:34px;border:1px solid var(--line);background-size:cover;background-position:center;position:relative;overflow:hidden;min-height:300px;display:flex;flex-direction:column;justify-content:flex-end}
.dcard::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,10,10,.15),rgba(10,10,10,.92))}
.dcard>*{position:relative}
.dcard h3{font-size:26px;margin-bottom:8px}
.dcard p{color:#d8d2c6;font-size:15px;max-width:420px}
/* faq */
.faq{max-width:820px;margin-top:36px;display:grid;gap:12px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 24px}
.faq summary{cursor:pointer;font-weight:800;font-size:17px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq p{color:var(--mut);margin-top:10px;font-size:15px}
/* final cta */
.final{background:linear-gradient(180deg,#160404,var(--bg));border-top:1px solid var(--line);text-align:center}
.final h2{max-width:720px;margin-left:auto;margin-right:auto}
.final .row{display:flex;gap:14px;justify-content:center;margin-top:30px;flex-wrap:wrap}
footer{border-top:1px solid var(--line);padding:44px 0;color:var(--mut);font-size:14px}
footer .wrap{display:flex;gap:26px;flex-wrap:wrap;justify-content:space-between}
@media(max-width:900px){
  .prices,.cycle{grid-template-columns:1fr}
  .libgrid{grid-template-columns:repeat(2,1fr)}
  .dual{grid-template-columns:1fr}
  nav.main{display:none}
  .cmp{aspect-ratio:4/3}
}