:root{--bg:#06080d;--card:rgba(255,255,255,.045);--line:rgba(255,255,255,.09);--ink:#eef3f7;--mut:#8f9ba7;--acc:#2fe3d0;--vio:#8b7bff;--grad:linear-gradient(120deg,#2fe3d0,#5a9bff 50%,#b37bff)}
[data-theme=light]{--bg:#f5f7fa;--card:#fff;--line:rgba(10,20,30,.09);--ink:#0c141c;--mut:#5b6875}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--acc)}
.top{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:max(12px,env(safe-area-inset-top)) 18px 12px;background:color-mix(in srgb,var(--bg) 75%,transparent);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.brand{color:var(--ink);text-decoration:none;font-weight:600;display:flex;gap:8px;align-items:center}.brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.dot{width:12px;height:12px;border-radius:50%;background:var(--grad);box-shadow:0 0 14px var(--acc)}
nav{display:flex;gap:14px;align-items:center}nav a{color:var(--mut);text-decoration:none;font-size:14px;font-weight:600}
nav button{background:var(--card);border:1px solid var(--line);color:var(--ink);border-radius:50%;width:34px;height:34px;font-size:16px}
main{max-width:860px;margin:0 auto;padding:0 18px 60px}
.hero{position:relative;padding:56px 0 28px}
.glow{position:absolute;inset:-40px -60px auto;height:360px;background:radial-gradient(closest-side,rgba(47,227,208,.25),transparent),radial-gradient(closest-side at 80% 40%,rgba(139,123,255,.25),transparent);filter:blur(30px);z-index:-1;animation:float 9s ease-in-out infinite alternate}
@keyframes float{to{transform:translateY(20px) scale(1.05)}}
.kicker{font-size:12px;letter-spacing:.18em;color:var(--acc);font-weight:700}
h1{font-size:clamp(34px,8vw,58px);line-height:1.04;letter-spacing:-.035em;margin:.3em 0 .4em}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--mut);font-size:17px;max-width:620px}.ar.lead{font-size:15px}
.cta{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;height:48px;padding:0 22px;border-radius:999px;font-weight:700;text-decoration:none;border:1px solid var(--line);color:var(--ink);background:var(--card);cursor:pointer;font-size:15px;transition:transform .15s}
.btn:active{transform:scale(.96)}.btn.primary{background:var(--grad);color:#041a17;border:0;box-shadow:0 10px 30px rgba(47,227,208,.3)}
.progress-card{display:flex;gap:16px;align-items:center;padding:16px 18px;border-radius:20px;background:var(--card);border:1px solid var(--line)}
.progress-card b{font-size:26px;display:block}.progress-card span{color:var(--mut);font-size:13px}
.bar{flex:1;height:10px;border-radius:9px;background:var(--line);overflow:hidden}.bar i{display:block;height:100%;width:0;background:var(--grad);transition:width .5s cubic-bezier(.2,.8,.2,1)}
h2{font-size:30px;letter-spacing:-.03em;margin:46px 0 4px}.sub{color:var(--mut);margin-top:0}
.levels{list-style:none;padding:0;margin:18px 0;display:grid;gap:12px}
.lvl{border-radius:22px;background:var(--card);border:1px solid var(--line);overflow:hidden;transition:border-color .2s}
.lvl.open{border-color:rgba(47,227,208,.45);box-shadow:0 14px 40px rgba(0,0,0,.25)}
.lvl>button{all:unset;cursor:pointer;display:flex;gap:14px;align-items:center;width:100%;padding:16px;box-sizing:border-box}
.num{flex:none;width:52px;height:52px;border-radius:16px;display:grid;place-items:center;font-weight:800;background:linear-gradient(135deg,rgba(47,227,208,.18),rgba(139,123,255,.18));color:var(--acc)}
.lvl.done .num{background:var(--grad);color:#041a17}
.lt b{display:block;font-size:17px}.lt span{color:var(--mut);font-size:14px}
.chev{margin-left:auto;color:var(--mut);transition:transform .25s}.lvl.open .chev{transform:rotate(90deg)}
.body{display:none;padding:0 16px 18px}.lvl.open .body{display:block;animation:in .3s ease}
@keyframes in{from{opacity:0;transform:translateY(-4px)}}
.body p{margin:.4em 0}.step{display:flex;gap:10px;align-items:flex-start;padding:10px 0;border-top:1px solid var(--line)}
.step input{width:22px;height:22px;accent-color:var(--acc);flex:none;margin-top:2px}
pre{background:#0b0f16;color:#d8f7f2;border:1px solid var(--line);border-radius:14px;padding:12px;overflow:auto;font-size:13px;line-height:1.45}
[data-theme=light] pre{background:#0f1720}
.tip{font-size:14px;color:var(--mut);background:rgba(47,227,208,.07);border-left:3px solid var(--acc);padding:8px 12px;border-radius:8px}
.arstage{position:relative;aspect-ratio:3/4;max-height:78vh;width:100%;border-radius:26px;overflow:hidden;background:radial-gradient(circle at 50% 40%,#16303a,#05070b);border:1px solid var(--line);margin-top:14px;touch-action:none}
#cam,#gl{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.arui{position:absolute;inset:auto 0 0;padding:20px;text-align:center;background:linear-gradient(transparent,rgba(0,0,0,.6))}.hint{color:#cfd8df;font-size:13px}
.archips{position:absolute;left:0;right:0;bottom:14px;display:flex;gap:8px;justify-content:center;flex-wrap:wrap;padding:0 10px}
.archips button{border:0;border-radius:999px;padding:9px 14px;font-weight:700;background:rgba(10,14,20,.6);color:#fff;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.archips button.on{background:var(--grad);color:#041a17}
footer{color:var(--mut);font-size:13px;text-align:center;margin-top:50px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
[hidden]{display:none!important}
.arui{z-index:3}.archips{z-index:4}#gl{z-index:2}#cam{z-index:1}
.lvl>button{position:relative;z-index:1}