/* =====================================================================
   THE BRAIN SONG — dark neuro-audio design system + 3D 360° ring
   ===================================================================== */
:root{
  --bg:#08061A; --bg-2:#100C2C; --surface:#171340; --surface-2:#201A52;
  --ink:#ECEBFF; --ink-soft:#B9B5E6; --ink-mute:#8A85B8;
  --violet:#7C5CFF; --violet-bright:#9B82FF; --indigo-deep:#4A34C7;
  --cyan:#38D6FF; --cyan-bright:#6FE6FF; --magenta:#E85CC4;
  --line:rgba(236,235,255,.12); --line-2:rgba(236,235,255,.22);
  --display:"Space Grotesk",system-ui,sans-serif; --body:"Inter",system-ui,sans-serif;
  --t-hero:clamp(2.4rem,5.4vw,4.3rem); --t-h2:clamp(1.9rem,3.6vw,2.9rem);
  --t-h3:clamp(1.15rem,1.7vw,1.4rem); --t-lead:clamp(1.04rem,1.3vw,1.2rem);
  --t-small:.875rem; --t-micro:.72rem;
  --gut:clamp(1.25rem,4vw,2.5rem); --max:1200px; --sec-y:clamp(4rem,8vw,7.5rem);
  --r-sm:10px; --r-md:16px; --r-lg:22px; --r-xl:30px;
  --sh-md:0 18px 44px -18px rgba(0,0,0,.75); --sh-lg:0 40px 80px -30px rgba(0,0,0,.85);
  --glow:0 0 60px -8px rgba(124,92,255,.6);
  --ease:cubic-bezier(.22,1,.36,1);
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--body);background:var(--bg);color:var(--ink);line-height:1.65;font-size:1.02rem;overflow-x:hidden;
  background-image:
    radial-gradient(900px circle at 10% -5%,rgba(124,92,255,.16),transparent 45%),
    radial-gradient(800px circle at 92% 6%,rgba(56,214,255,.13),transparent 45%),
    radial-gradient(700px circle at 60% 100%,rgba(232,92,196,.10),transparent 50%);
  background-attachment:fixed}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--display);font-weight:700;line-height:1.08;letter-spacing:-.02em}
.wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gut)}
.section{padding-block:var(--sec-y);position:relative}
.section--tint{background:linear-gradient(180deg,var(--bg-2),transparent)}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:var(--t-micro);font-weight:700;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--cyan);border-radius:2px}
.eyebrow--violet{color:var(--violet-bright)}.eyebrow--violet::before{background:var(--violet-bright)}
.h2{font-size:var(--t-h2);margin:.7rem 0}
.lead{font-size:var(--t-lead);color:var(--ink-soft);max-width:60ch}
.center{text-align:center}.mt-lg{margin-top:clamp(1.5rem,3vw,2.5rem)}
.head{max-width:52rem}.head--mid{margin-inline:auto;text-align:center}.head--mid .lead{margin-inline:auto}
.fine{font-size:var(--t-small);color:var(--ink-mute);line-height:1.6}
em.hl{font-style:normal;font-weight:700;background:linear-gradient(90deg,var(--cyan),var(--violet-bright));-webkit-background-clip:text;background-clip:text;color:transparent}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--display);
  font-weight:600;font-size:1rem;cursor:pointer;border:0;padding:.95rem 1.7rem;border-radius:100px;
  transition:transform .18s var(--ease),box-shadow .24s var(--ease),filter .2s}
.btn--primary{background:linear-gradient(120deg,var(--violet),var(--cyan));color:#0A0620;
  box-shadow:0 12px 26px -10px rgba(124,92,255,.75),inset 0 1px 0 rgba(255,255,255,.3)}
.btn--primary:hover{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 18px 34px -10px rgba(56,214,255,.6)}
.btn--ghost{background:rgba(236,235,255,.04);border:1.5px solid var(--line-2);color:var(--ink)}
.btn--ghost:hover{border-color:var(--cyan);transform:translateY(-2px)}
.btn--lg{padding:1.1rem 2.1rem;font-size:1.08rem}.btn--wide{width:100%}
.btn:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}
.btn-row{display:flex;gap:.9rem;flex-wrap:wrap;margin-top:1.8rem}

/* announce + nav */
.announce{background:linear-gradient(90deg,var(--indigo-deep),var(--violet) 55%,var(--magenta));color:#fff;
  text-align:center;font-size:.86rem;font-weight:600;padding:.6rem 1rem}
.nav{position:sticky;top:0;z-index:50;background:rgba(8,6,26,.72);backdrop-filter:blur(14px) saturate(1.4);
  border-bottom:1px solid var(--line);transition:box-shadow .25s,background .25s}
.nav--scrolled{background:rgba(8,6,26,.94);box-shadow:0 10px 30px -14px rgba(0,0,0,.85)}
.nav__in{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:.85rem}
.brand{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--display);font-weight:700;font-size:1.2rem;color:var(--ink)}
.brand svg{width:30px;height:30px}
.nav__links{display:flex;gap:1.6rem;align-items:center}
.nav__links a{font-size:.92rem;color:var(--ink-soft);font-weight:500;transition:color .2s}
.nav__links a:hover{color:var(--cyan)}
.nav__cta{padding:.6rem 1.2rem;font-size:.92rem}
.nav__burger{display:none;background:none;border:0;color:var(--ink);cursor:pointer}.nav__burger svg{width:28px;height:28px}

/* HERO */
.hero{padding-top:clamp(2rem,4vw,3.5rem)}
.hero__grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3rem);align-items:center}
.tagpill{display:inline-flex;align-items:center;gap:.6rem;background:rgba(236,235,255,.05);border:1px solid var(--line);
  border-radius:100px;padding:.45rem .95rem;font-size:.82rem;color:var(--ink-soft)}
.tagpill b{color:var(--cyan);font-weight:700}
.hero h1{font-size:var(--t-hero);margin:1.1rem 0 1.2rem}
.hero__list{list-style:none;padding:0;margin:1.6rem 0 0;display:grid;gap:.7rem}
.hero__list li{display:flex;gap:.7rem;align-items:flex-start;color:var(--ink-soft)}
.hero__list svg{flex:0 0 22px;width:22px;height:22px;color:var(--cyan);margin-top:2px}

/* ===== 3D 360° RING ===== */
.ring3d{position:relative;perspective:1500px;min-height:clamp(360px,42vw,520px);display:grid;place-items:center}
.ring3d__halo{position:absolute;width:70%;aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle,rgba(124,92,255,.4),rgba(56,214,255,.14) 45%,transparent 70%);filter:blur(24px);animation:pulse 5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.7;transform:scale(1)}50%{opacity:1;transform:scale(1.08)}}
.ring{position:relative;width:200px;height:290px;transform-style:preserve-3d;animation:spin 26s linear infinite}
.ring:hover{animation-play-state:paused}
@keyframes spin{from{transform:rotateY(0)}to{transform:rotateY(360deg)}}
.ring__panel{position:absolute;inset:0;border-radius:18px;overflow:hidden;
  background:linear-gradient(160deg,var(--surface),var(--bg-2));border:1px solid var(--line-2);
  box-shadow:var(--sh-md),inset 0 0 40px rgba(124,92,255,.1);
  display:grid;place-items:center;padding:16px;backface-visibility:hidden}
.ring__panel img{max-width:100%;max-height:100%;width:auto;object-fit:contain;filter:drop-shadow(0 10px 18px rgba(0,0,0,.5))}
.ring__panel--brand{text-align:center}
.ring__panel--brand .rp-k{font-family:var(--display);font-weight:700;font-size:1.1rem;background:linear-gradient(90deg,var(--cyan),var(--violet-bright));-webkit-background-clip:text;background-clip:text;color:transparent}
.ring__panel--brand .rp-s{font-size:.78rem;color:var(--ink-mute);margin-top:.4rem}
.ring__floor{position:absolute;bottom:8%;width:56%;height:26px;border-radius:50%;
  background:radial-gradient(ellipse,rgba(56,214,255,.4),transparent 70%);filter:blur(7px)}
.ring__hint{position:absolute;bottom:0;font-size:.72rem;color:var(--ink-mute);letter-spacing:.05em}
/* equalizer bars */
.eq{display:flex;gap:3px;align-items:flex-end;height:34px;justify-content:center;margin-top:.8rem}
.eq i{width:4px;background:linear-gradient(180deg,var(--cyan),var(--violet));border-radius:2px;animation:bounce 1.1s ease-in-out infinite}
.eq i:nth-child(2){animation-delay:.15s}.eq i:nth-child(3){animation-delay:.3s}.eq i:nth-child(4){animation-delay:.45s}
.eq i:nth-child(5){animation-delay:.6s}.eq i:nth-child(6){animation-delay:.2s}.eq i:nth-child(7){animation-delay:.4s}
@keyframes bounce{0%,100%{height:8px}50%{height:32px}}

/* trust */
.trust{border-block:1px solid var(--line);background:rgba(0,0,0,.2)}
.trust__row{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;padding-block:1.6rem}
.trust__item{display:flex;gap:.7rem;align-items:center;justify-content:center}
.trust__item svg{width:30px;height:30px;color:var(--cyan);flex:0 0 auto}
.trust__item b{display:block;font-family:var(--display);font-size:.92rem}
.trust__item span{font-size:.76rem;color:var(--ink-mute)}

/* cards / grids */
.grid{display:grid;gap:clamp(1rem,2vw,1.5rem)}
.grid--2{grid-template-columns:repeat(2,1fr)}.grid--3{grid-template-columns:repeat(3,1fr)}
.card{background:linear-gradient(180deg,var(--surface),var(--bg-2));border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.3rem,2.2vw,1.8rem);transition:transform .2s var(--ease),border-color .2s,box-shadow .24s}
.card:hover{transform:translateY(-5px);border-color:var(--cyan);box-shadow:var(--sh-md)}
.card__num{font-family:var(--display);font-size:.8rem;font-weight:700;color:var(--cyan);letter-spacing:.1em}
.card h3{font-size:var(--t-h3);margin:.5rem 0}.card p{color:var(--ink-soft);font-size:.96rem}
.icon-badge{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:rgba(124,92,255,.14);
  border:1px solid var(--line-2);color:var(--violet-bright);margin-bottom:1rem}.icon-badge svg{width:26px;height:26px}

/* pros/cons */
.pc{background:linear-gradient(180deg,var(--surface),var(--bg-2));border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(1.3rem,2.2vw,1.9rem)}
.pc h3{display:flex;align-items:center;gap:.6rem;font-size:1.2rem;margin-bottom:1rem}
.pc ul{list-style:none;padding:0;display:grid;gap:.7rem}
.pc li{display:flex;gap:.6rem;color:var(--ink-soft);font-size:.95rem}
.pc li svg{flex:0 0 20px;width:20px;height:20px;margin-top:2px}
.pc--pro li svg{color:var(--cyan)}.pc--con li svg{color:var(--magenta)}

/* callout */
.callout{border:1px solid var(--line);border-left:3px solid var(--cyan);background:rgba(56,214,255,.06);border-radius:var(--r-md);padding:1.1rem 1.3rem;font-size:.94rem;color:var(--ink-soft)}
.callout--warn{border-left-color:var(--magenta);background:rgba(232,92,196,.07)}
.callout b{color:var(--ink)}

/* testimonials */
.quote{background:linear-gradient(180deg,var(--surface),var(--bg-2));border:1px solid var(--line);border-radius:var(--r-lg);padding:1.6rem}
.quote__stars{color:var(--cyan);letter-spacing:2px;margin-bottom:.6rem}
.quote p{color:var(--ink-soft);font-size:.96rem}
.quote__by{display:flex;align-items:center;gap:.7rem;margin-top:1.1rem;border-top:1px solid var(--line);padding-top:1rem}
.quote__av{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--violet),var(--cyan));display:grid;place-items:center;font-family:var(--display);font-weight:700;color:#0A0620;font-size:.9rem}
.quote__by b{font-size:.9rem}.quote__by span{font-size:.78rem;color:var(--ink-mute)}

/* pricing (single hero offer) */
.offer{max-width:560px;margin-inline:auto;background:linear-gradient(180deg,var(--surface),var(--bg-2));
  border:2px solid var(--violet);border-radius:var(--r-xl);padding:clamp(1.8rem,4vw,2.6rem);text-align:center;box-shadow:var(--glow)}
.offer__badge{display:inline-block;background:linear-gradient(120deg,var(--violet),var(--cyan));color:#0A0620;font-family:var(--display);font-weight:700;font-size:.72rem;letter-spacing:.1em;padding:.35rem .9rem;border-radius:100px;margin-bottom:1rem}
.offer__img{max-width:320px;margin:0 auto 1rem}
.offer__price{font-family:var(--display);font-weight:700;line-height:1}
.offer__price .now{font-size:3.6rem;background:linear-gradient(90deg,var(--cyan),var(--violet-bright));-webkit-background-clip:text;background-clip:text;color:transparent}
.offer__price .was{font-size:1.3rem;color:var(--ink-mute);text-decoration:line-through;margin-left:.5rem}
.offer__feat{list-style:none;padding:0;margin:1.4rem 0;display:grid;gap:.6rem;text-align:left;max-width:340px;margin-inline:auto}
.offer__feat li{display:flex;gap:.6rem;color:var(--ink-soft);font-size:.95rem}
.offer__feat svg{flex:0 0 20px;width:20px;height:20px;color:var(--cyan);margin-top:2px}
.offer__note{font-size:.82rem;color:var(--ink-mute);margin-top:1rem}

/* bonuses */
.bonus__tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--magenta);margin-bottom:.5rem}
.bonus__val del{color:var(--ink-mute)}.bonus__val b{color:var(--cyan)}

/* guarantee */
.guarantee{display:grid;grid-template-columns:auto 1fr;gap:clamp(1.5rem,4vw,3rem);align-items:center;
  background:linear-gradient(135deg,var(--surface),var(--bg-2));border:1px solid var(--line);border-radius:var(--r-xl);padding:clamp(1.8rem,4vw,3rem)}
.guarantee__seal img{width:190px}
@media(max-width:640px){.guarantee{grid-template-columns:1fr;text-align:center}.guarantee__seal{margin-inline:auto}}

/* faq */
.faq__item{border:1px solid var(--line);border-radius:var(--r-md);margin-bottom:.8rem;background:var(--surface);overflow:hidden;transition:border-color .2s}
.faq__item[data-open]{border-color:var(--cyan)}
.faq__q{width:100%;text-align:left;background:none;border:0;color:var(--ink);font-family:var(--display);font-weight:600;font-size:1.02rem;padding:1.1rem 1.3rem;cursor:pointer;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq__q svg{flex:0 0 20px;width:20px;height:20px;color:var(--cyan);transition:transform .3s}
.faq__item[data-open] .faq__q svg{transform:rotate(45deg)}
.faq__a{max-height:0;overflow:hidden;transition:max-height .35s var(--ease)}
.faq__a p{padding:0 1.3rem 1.2rem;color:var(--ink-soft);font-size:.95rem}

/* final band */
.band{position:relative;overflow:hidden;border-radius:var(--r-xl);text-align:center;padding:clamp(2.6rem,6vw,4.6rem) clamp(1.6rem,4vw,3.2rem);
  background:radial-gradient(700px circle at 15% 0%,rgba(124,92,255,.3),transparent 55%),radial-gradient(700px circle at 85% 100%,rgba(56,214,255,.25),transparent 55%),var(--surface);border:1px solid var(--line-2)}
.band h2{color:var(--ink)}.band .lead{color:var(--ink-soft);margin-inline:auto}
.band__img{position:relative;margin:1.8rem auto .6rem;max-width:460px}
.band__img img{filter:drop-shadow(0 20px 34px rgba(0,0,0,.6))}

/* footer */
.foot{background:#06040F;border-top:1px solid var(--line);padding-block:clamp(3rem,6vw,4.5rem) 2rem;margin-top:var(--sec-y)}
.foot__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:2rem}
.foot__brand p{color:var(--ink-mute);font-size:.9rem;margin-top:.8rem;max-width:34ch}
.foot h4{font-family:var(--display);font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:var(--cyan);margin-bottom:1rem}
.foot ul{list-style:none;padding:0;display:grid;gap:.6rem}.foot ul a{color:var(--ink-soft);font-size:.9rem}.foot ul a:hover{color:var(--cyan)}
.foot__legal{border-top:1px solid var(--line);margin-top:2.5rem;padding-top:1.6rem}
.foot__legal p{font-size:.78rem;color:var(--ink-mute);line-height:1.62;margin-bottom:.7rem}.foot__legal strong{color:var(--ink-soft)}
.foot__base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;margin-top:1.4rem;font-size:.82rem;color:var(--ink-mute)}
.foot__base a{color:var(--ink-mute)}.foot__base a:hover{color:var(--cyan)}

/* reveal */
.rise{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rise.is-in{opacity:1;transform:none}
[data-d="1"]{transition-delay:.08s}[data-d="2"]{transition-delay:.16s}[data-d="3"]{transition-delay:.24s}

/* legal / form */
.doc{max-width:820px;margin-inline:auto}
.doc h1{font-size:clamp(2rem,4vw,2.8rem);margin-bottom:.4rem}
.doc .updated{color:var(--cyan);font-size:.8rem;text-transform:uppercase;letter-spacing:.12em;font-weight:700;margin-bottom:2rem;display:block}
.doc h2{font-size:1.3rem;margin:2rem 0 .7rem}.doc p,.doc li{color:var(--ink-soft);font-size:.98rem;margin-bottom:.8rem}
.doc ul{padding-left:1.2rem;margin-bottom:1rem}.doc a{color:var(--cyan);text-decoration:underline}
.form{display:grid;gap:1rem;max-width:560px}.form label{display:grid;gap:.4rem;font-size:.9rem;font-weight:600}
.form input,.form select,.form textarea{background:var(--surface);border:1px solid var(--line-2);border-radius:var(--r-sm);padding:.8rem 1rem;color:var(--ink);font-family:var(--body);font-size:1rem}
.form input:focus,.form select:focus,.form textarea:focus{outline:2px solid var(--cyan);border-color:var(--cyan)}

/* responsive */
@media(max-width:900px){
  .hero__grid{grid-template-columns:1fr}.ring3d{order:-1;min-height:360px}
  .trust__row{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:1fr}.foot__grid{grid-template-columns:1fr 1fr}
  .nav__links{display:none}.nav__burger{display:block}
  .nav__links.open{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:var(--bg-2);padding:1rem var(--gut);border-bottom:1px solid var(--line);gap:1rem}
}
@media(max-width:560px){.grid--2{grid-template-columns:1fr}.foot__grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.rise{opacity:1;transform:none}.ring{transform:rotateY(-18deg)}}