:root{--bg:#0d0f13;--panel:#151922;--line:#262c38;--fg:#e8ecf2;--mut:#9aa4b2;--acc:#3ad29f}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--acc)}main{max-width:1040px;margin:auto;padding:0 20px}
.nav{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#0d0f13ee;z-index:5}
.nav nav a{margin-left:18px;color:var(--fg);text-decoration:none;font-size:15px}
.btn{background:var(--acc);color:#06120d!important;padding:7px 14px;border-radius:8px;font-weight:600;text-decoration:none}.btn.big{padding:11px 20px;font-size:17px}
.hero{text-align:center;padding:48px 0 20px}h1{font-size:clamp(30px,5vw,52px);margin:0 0 10px;line-height:1.1}h1 span{display:block;font-size:.5em;color:var(--mut);font-weight:500;margin-top:8px}
.lead{color:var(--mut);max-width:680px;margin:0 auto 24px}.demo{width:100%;border-radius:14px;border:1px solid var(--line);background:#000}
.cta{margin:22px 0}.tag{color:var(--acc);font-weight:600;margin-left:12px}
section{padding:36px 0;border-bottom:1px solid var(--line)}h2{font-size:28px;margin:0 0 8px}.muted{color:var(--mut)}.small{font-size:14px}
.pick{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.pick button{background:var(--panel);color:var(--fg);border:1px solid var(--line);border-radius:999px;padding:7px 14px;cursor:pointer;font:inherit;font-size:15px}
.pick button.on{background:var(--acc);color:#06120d;border-color:var(--acc);font-weight:600}
.player{max-width:620px;margin:10px auto}.stage{position:relative;aspect-ratio:1;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#000;touch-action:none;cursor:ew-resize;user-select:none}
.stage video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.top{position:absolute;inset:0;clip-path:inset(0 0 0 50%)}
.divider{position:absolute;top:0;bottom:0;left:50%;width:2px;background:var(--acc);transform:translateX(-1px)}
.divider span{position:absolute;top:50%;left:50%;width:34px;height:34px;margin:-17px;border-radius:50%;background:var(--acc);box-shadow:0 2px 10px #0008}
.lbl{position:absolute;top:10px;font-style:normal;font-weight:700;font-size:14px;background:#000a;padding:4px 10px;border-radius:6px}.lbl.l{left:10px}.lbl.r{right:10px}
.stage.sbs{aspect-ratio:2;cursor:default}.stage.sbs video#vA{width:50%}.stage.sbs .top{clip-path:none;left:50%}.stage.sbs #vB{width:100%}.stage.sbs .divider{display:none}
.player:has(.sbs){max-width:1000px}
.controls{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;align-items:center;margin-top:12px}
.controls button{background:var(--panel);color:var(--fg);border:1px solid var(--line);border-radius:8px;padding:7px 18px;font:inherit;cursor:pointer}
#note{text-align:center}
.flow{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;counter-reset:s}
.flow li{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;position:relative;counter-increment:s}
.flow li::before{content:counter(s);color:var(--acc);font-weight:700;margin-right:6px}.flow b{display:inline}.flow span{display:block;color:var(--mut);font-size:14px;margin-top:4px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px}.card h3{margin:0 0 6px}
footer{text-align:center;color:var(--mut);padding:28px 20px;font-size:14px}
@media(max-width:600px){.nav nav a:not(.btn){display:none}.stage.sbs{aspect-ratio:.5}.stage.sbs video#vA{width:100%;height:50%}.stage.sbs .top{left:0;top:50%}.stage.sbs .lbl.r{top:calc(50% + 10px);left:10px;right:auto}}