/* Etapa 13 · Vários vórtices */
#vtx{position:fixed;inset:0;pointer-events:none;overflow:hidden}
.vtx{position:absolute;left:0;top:0;--rr:20px;pointer-events:none;transition:opacity .3s}
.vb3{position:absolute;left:0;top:0;width:calc(var(--rr) * 2);height:calc(var(--rr) * 2);transform:translate(-50%,-50%);border-radius:50%}
.vh{position:absolute;inset:0;border-radius:50%;background:radial-gradient(circle at 50% 45%,#050506 0 62%,#020203 70%);box-shadow:0 0 0 1px rgba(255,206,160,.4),0 0 calc(var(--rr) * .5) rgba(255,170,90,.28),0 0 calc(var(--rr) * 1.6) rgba(255,150,80,.08);z-index:2;transition:box-shadow .3s}
.vd{position:absolute;left:50%;top:50%;width:calc(var(--rr) * 5.4);height:calc(var(--rr) * 5.4);border-radius:50%;transform:translate(-50%,-50%) rotateX(74deg) rotateZ(0deg);background:radial-gradient(circle,transparent 0 33%,rgba(255,214,170,.55) 36%,rgba(255,160,80,.28) 46%,rgba(255,140,70,.1) 60%,transparent 70%),repeating-conic-gradient(from 0deg,rgba(255,230,200,.18) 0 6deg,transparent 6deg 17deg);-webkit-mask-image:radial-gradient(circle,transparent 0 33%,#000 36% 62%,transparent 70%);mask-image:radial-gradient(circle,transparent 0 33%,#000 36% 62%,transparent 70%);animation:vgiro 9s linear infinite;z-index:1}
.vf{position:absolute;left:50%;top:50%;width:calc(var(--rr) * 5.4);height:calc(var(--rr) * 5.4);transform:translate(-50%,-50%);clip-path:inset(50% 0 0 0);z-index:3}
@keyframes vgiro{to{transform:translate(-50%,-50%) rotateX(74deg) rotateZ(360deg)}}
.vtx b{position:absolute;left:0;top:calc(var(--rr) * 1.75 + 8px);transform:translateX(-50%);white-space:nowrap;font:500 9.5px var(--f-mono);letter-spacing:.24em;text-transform:uppercase;color:#8a8279;transition:color .3s}
.vtx.sobre b,.vtx.foco b{color:#ffdcb8}
.vtx.sobre .vh,.vtx.foco .vh{box-shadow:0 0 0 1px rgba(255,214,170,.7),0 0 calc(var(--rr) * .7) rgba(255,170,90,.45),0 0 calc(var(--rr) * 2) rgba(255,150,80,.14)}
body.sobre-vtx{cursor:pointer}
.vlista{position:fixed;left:0;top:0;z-index:5;margin-left:-90px;width:180px;box-sizing:border-box;padding:10px 14px;border-radius:12px;background:linear-gradient(160deg,rgba(22,21,25,.88),rgba(9,9,11,.92));border:1px solid rgba(255,236,214,.09);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);opacity:0;pointer-events:none;transition:opacity .5s}
.vlista.on{opacity:1;pointer-events:auto}
.vlista h4{margin:0 0 6px;font:500 9px var(--f-mono);letter-spacing:.22em;text-transform:uppercase;color:#ffdcb8}
.vlista ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:5px}
.vlista li{font-size:12.5px;color:#6d6870;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.vlista a{color:#cfc6b8;text-decoration:none}
.vlista a:hover{color:#fff1df}
.avancar{position:fixed;right:max(20px,env(safe-area-inset-right,0px));bottom:calc(env(safe-area-inset-bottom,0px) + 108px);z-index:6;width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--glass);border:1px solid var(--line);color:#8a8279;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;transition:color .3s,border-color .3s,box-shadow .3s}
.avancar svg{width:16px;height:16px;fill:currentColor}
.avancar:hover,.avancar.on{color:#ffdcb8;border-color:rgba(255,185,121,.4);box-shadow:0 0 24px rgba(255,170,90,.18)}
@media (max-width:599px){.avancar{right:16px;bottom:calc(env(safe-area-inset-bottom,0px) + 150px)}.voo{padding:8px 12px;border-radius:12px;background:rgba(10,10,12,.88);border:1px solid rgba(255,236,214,.08)}}
@media (prefers-reduced-motion:reduce){.vd{animation:none}}