/* ============================================================
   THE BRAIN SONG — Design Tokens
   Palette: deep navy-black base, electric-blue + violet accents,
   amber as the single warm counter-note.
   Type: Space Grotesk (display) / Inter (body) / IBM Plex Mono (data)
   Signature element: the "waveform line" — jagged noise resolving
   into a clean gamma sine wave. Used in the hero and as a divider.
   ============================================================ */

:root{
  --bg:            #0B0E1A;
  --bg-alt:        #0E1330;
  --surface:       #131832;
  --surface-2:     #1A2044;
  --line:          rgba(143, 156, 214, 0.16);

  --blue:          #4F8EFF;
  --blue-soft:     rgba(79, 142, 255, 0.14);
  --violet:        #8B5CF6;
  --violet-soft:   rgba(139, 92, 246, 0.14);
  --amber:         #F5B942;
  --amber-soft:    rgba(245, 185, 66, 0.14);

  --text:          #EDEFF7;
  --text-dim:      #B7BEDA;
  --text-mute:     #7C84A8;

  --font-display:  'Space Grotesk', sans-serif;
  --font-body:     'Inter', sans-serif;
  --font-mono:     'IBM Plex Mono', monospace;

  --radius:        14px;
  --radius-lg:     22px;
  --max:           1180px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; height:auto; display:block; }
a{ color: inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family: var(--font-display); margin:0 0 .5em; letter-spacing:-0.01em; }
p{ margin:0 0 1em; color: var(--text-dim); }
ul{ margin:0; padding:0; list-style:none; }

.wrap{ max-width: var(--max); margin:0 auto; padding: 0 24px; }
.eyebrow{
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--blue);
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom: 14px;
}
.eyebrow::before{
  content:"";
  width:16px; height:1px;
  background: var(--blue);
  display:inline-block;
}

section{ padding: 96px 0; position:relative; }
.section-divider{
  border:0; height:44px; margin:0;
  background: transparent;
}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  font-family: var(--font-display);
  font-weight:600;
  font-size:1rem;
  padding: 16px 30px;
  border-radius: 999px;
  border: none;
  cursor:pointer;
  transition: transform .18s ease, box-shadow .18s ease;
}
.btn-primary{
  background: linear-gradient(100deg, var(--blue), var(--violet));
  color:#fff;
  box-shadow: 0 8px 30px -8px rgba(79,142,255,.55);
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 12px 34px -6px rgba(79,142,255,.7); }
.btn-ghost{
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
}
.btn-ghost:hover{ border-color: var(--blue); }
.btn-sm{ padding: 10px 20px; font-size:.85rem; }
.btn-block{ width:100%; }

/* Nav */
.nav{
  position: sticky; top:0; z-index: 50;
  background: rgba(11,14,26,0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap{ display:flex; align-items:center; justify-content:space-between; padding:16px 24px; }
.brand{ font-family: var(--font-display); font-weight:700; font-size:1.15rem; display:flex; align-items:center; gap:10px; }
.brand-dot{ width:10px; height:10px; border-radius:50%; background: linear-gradient(135deg,var(--blue),var(--violet)); box-shadow: 0 0 14px 2px rgba(79,142,255,.7); }
.nav-links{ display:flex; gap:28px; font-size:.92rem; color: var(--text-dim); }
.nav-links a:hover{ color: var(--text); }
.nav-cta{ display:flex; align-items:center; gap:18px; }
.nav-mobile-toggle{ display:none; }

@media (max-width: 860px){
  .nav-links{ display:none; }
}

/* Hero */
.hero{ padding: 72px 0 60px; overflow:hidden; position:relative; }
.hero-grid{ display:grid; grid-template-columns: 1.05fr .95fr; gap:56px; align-items:center; }
.hero h1{ font-size: clamp(2.2rem, 4vw, 3.4rem); line-height:1.08; }
.hero h1 .grad{ background: linear-gradient(100deg, var(--blue), var(--violet)); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero-sub{ font-size:1.1rem; max-width:520px; }
.hero-cta-row{ display:flex; gap:16px; align-items:center; margin-top: 28px; flex-wrap:wrap; }
.hero-note{ font-family: var(--font-mono); font-size:.78rem; color: var(--text-mute); margin-top:10px; }
.hero-image{ position:relative; }
.hero-image img{ border-radius: var(--radius-lg); }
.waveform{ width:100%; height:auto; display:block; margin: 40px 0 0; }

/* Trust badges */
.badges{ display:flex; flex-wrap:wrap; gap:14px; margin-top:36px; }
.badge{
  display:flex; align-items:center; gap:8px;
  border:1px solid var(--line); border-radius: 999px;
  padding: 9px 16px; font-size:.82rem; color: var(--text-dim);
  font-family: var(--font-mono);
}
.badge svg{ flex-shrink:0; }

/* Section headers */
.section-head{ max-width: 680px; margin-bottom: 52px; }
.section-head h2{ font-size: clamp(1.7rem, 3vw, 2.4rem); }
.section-head p{ font-size:1.05rem; }
.center{ text-align:center; margin-left:auto; margin-right:auto; }

/* Problem / Solution */
.split{ display:grid; grid-template-columns: 1fr 1fr; gap:28px; }
.split-card{
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius-lg);
  padding: 32px;
}
.split-card.problem{ border-color: rgba(245,185,66,.25); }
.split-card.solution{ border-color: rgba(79,142,255,.3); }
.split-card h3{ font-size:1.2rem; }
.split-card ul li{ display:flex; gap:10px; margin-bottom:12px; color: var(--text-dim); font-size:.96rem; }
.split-card ul li::before{ content:"—"; color: var(--text-mute); flex-shrink:0; }

/* How it works */
.steps{ counter-reset: step; display:grid; gap:22px; }
.step{
  display:grid; grid-template-columns: 64px 1fr; gap:24px;
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
  padding: 26px 28px;
}
.step-num{ font-family: var(--font-mono); font-size:1.6rem; color: var(--blue); opacity:.85; }
.step h4{ font-size:1.05rem; margin-bottom:6px; }
.step p{ margin:0; font-size:.94rem; }

/* Features / ingredients grid */
.grid-3{ display:grid; grid-template-columns: repeat(3, 1fr); gap:22px; }
.grid-2{ display:grid; grid-template-columns: repeat(2, 1fr); gap:22px; }
.feature-card{
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
  padding: 28px; height:100%;
}
.feature-icon{
  width:44px; height:44px; border-radius:12px;
  background: var(--blue-soft); display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; color: var(--blue);
}
.feature-card h4{ font-size:1.05rem; }
.feature-card p{ font-size:.93rem; margin:0; }

/* Benefits list */
.benefit-row{
  display:grid; grid-template-columns: 28px 1fr; gap:16px;
  padding: 20px 0; border-bottom:1px solid var(--line);
}
.benefit-row:last-child{ border-bottom:none; }
.benefit-check{ color: var(--blue); }
.benefit-row h4{ font-size:1rem; margin-bottom:4px; }
.benefit-row p{ margin:0; font-size:.92rem; }

/* Reviews */
.disclaimer-tag{
  display:inline-block; font-family: var(--font-mono); font-size:.72rem;
  background: var(--amber-soft); color: var(--amber);
  border:1px solid rgba(245,185,66,.35); border-radius:8px;
  padding:6px 10px; margin-bottom: 26px;
}
.reviews{ display:grid; grid-template-columns: repeat(2,1fr); gap:22px; }
.review-card{
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
  padding:28px;
}
.stars{ color: var(--amber); letter-spacing:2px; margin-bottom:12px; font-size:.9rem; }
.review-name{ font-family: var(--font-display); font-size:.95rem; margin-top:14px; }
.review-loc{ font-family: var(--font-mono); font-size:.75rem; color: var(--text-mute); }

/* Pricing */
.pricing-card{
  max-width: 460px; margin:0 auto;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border:1px solid rgba(79,142,255,.35); border-radius: var(--radius-lg);
  padding: 40px; text-align:center;
  box-shadow: 0 30px 80px -30px rgba(79,142,255,.35);
}
.pricing-image{ width:100%; max-width:320px; aspect-ratio: 753/447; object-fit:cover; margin:0 auto 22px; border-radius: var(--radius); }
.price-was{ font-family: var(--font-mono); color: var(--text-mute); text-decoration: line-through; font-size:1.1rem; }
.price-now{ font-family: var(--font-display); font-size:3.2rem; margin: 6px 0 4px; }
.price-now sup{ font-size:1.3rem; top:-1.2em; }
.price-tag{ font-family: var(--font-mono); font-size:.8rem; color: var(--amber); background: var(--amber-soft); display:inline-block; padding:5px 12px; border-radius:999px; margin-bottom:18px; }
.price-list{ text-align:left; margin: 26px 0; }
.price-list li{ display:flex; gap:10px; padding:8px 0; font-size:.92rem; color: var(--text-dim); }

/* Video */
.video-frame{
  max-width: 860px; margin: 0 auto; aspect-ratio: 16/9;
  border-radius: var(--radius-lg); overflow:hidden;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border:1px solid var(--line); position:relative;
}
.video-frame iframe, .video-frame video{
  width:100%; height:100%; display:block; border:0;
}
.video-placeholder{
  position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:10px; color: var(--text-mute); text-align:center; padding: 0 30px;
}
.video-placeholder svg{ color: var(--blue); opacity:.7; }
.video-placeholder-label{ font-family: var(--font-display); font-size:1.1rem; color: var(--text-dim); margin:0; }
.video-placeholder-note{ font-family: var(--font-mono); font-size:.72rem; color: var(--text-mute); max-width:340px; }

/* Bonuses */
.bonus-card{
  background: var(--surface); border:1px solid rgba(139,92,246,.3); border-radius: var(--radius);
  padding:22px; margin-bottom:16px;
  display:grid; grid-template-columns: 200px 1fr; gap:24px; align-items:center;
}
.bonus-card img{
  width:100%; aspect-ratio: 753 / 447; object-fit:cover; border-radius: 10px;
}
.bonus-value{ font-family: var(--font-mono); color: var(--violet); font-size:.8rem; }
@media (max-width: 640px){
  .bonus-card{ grid-template-columns: 1fr; }
}

/* Guarantee */
.guarantee{
  background: radial-gradient(120% 140% at 20% 0%, rgba(79,142,255,.16), transparent 60%), var(--surface);
  border:1px solid var(--line); border-radius: var(--radius-lg);
  padding: 52px; display:grid; grid-template-columns: 140px 1fr; gap:36px; align-items:center;
}
.guarantee-badge{
  width:120px; height:120px; border-radius:50%;
  border: 2px solid var(--blue); display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-size:1.6rem; color: var(--blue); text-align:center;
}

/* FAQ */
.faq-item{ border-bottom:1px solid var(--line); }
.faq-q{
  display:flex; justify-content:space-between; align-items:center; gap:20px;
  padding: 22px 0; cursor:pointer; font-family: var(--font-display); font-size:1rem;
}
.faq-icon{ transition: transform .2s ease; flex-shrink:0; color: var(--blue); }
.faq-item[open] .faq-icon{ transform: rotate(45deg); }
.faq-a{ padding: 0 0 22px; font-size:.95rem; }
summary::-webkit-details-marker{ display:none; }

/* Final CTA */
.final-cta{
  text-align:center; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(79,142,255,.16), rgba(139,92,246,.16));
  border:1px solid var(--line);
  padding: 70px 40px;
}
.final-cta h2{ font-size: clamp(1.8rem,3.4vw,2.6rem); max-width:640px; margin: 0 auto 16px; }
.final-cta p{ max-width:520px; margin:0 auto 30px; }
.final-cta-grid{
  display:grid; grid-template-columns: 340px 1fr; gap:44px; align-items:center; text-align:left;
}
.final-cta-grid .final-cta-text{ text-align:left; }
.final-cta-grid h2{ margin-left:0; }
.final-cta-grid p{ margin-left:0; }
.final-cta-image img{ border-radius: var(--radius-lg); width:100%; aspect-ratio: 753/447; object-fit:cover; }
@media (max-width: 760px){
  .final-cta-grid{ grid-template-columns: 1fr; text-align:center; }
  .final-cta-grid .final-cta-text{ text-align:center; }
  .final-cta-grid h2, .final-cta-grid p{ margin-left:auto; margin-right:auto; }
  .final-cta-image{ max-width:220px; margin:0 auto; }
}

/* Footer */
footer{ border-top:1px solid var(--line); padding: 56px 0 32px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; margin-bottom: 40px; }
.footer-col h5{ font-family: var(--font-mono); font-size:.78rem; text-transform:uppercase; letter-spacing:.08em; color: var(--text-mute); margin-bottom:16px; }
.footer-col ul li{ margin-bottom:10px; font-size:.9rem; }
.footer-col ul li a:hover{ color: var(--blue); }
.footer-bottom{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; border-top:1px solid var(--line); padding-top:24px; font-size:.8rem; color: var(--text-mute); }

/* Popup - social proof */
.proof-popup{
  position: fixed; left: 20px; bottom: 20px; z-index: 60;
  background: var(--surface); border:1px solid var(--line); border-radius: 14px;
  padding: 14px; display:flex; align-items:flex-start; gap:12px;
  max-width: 320px; box-shadow: 0 20px 50px -14px rgba(0,0,0,.6);
  transform: translateY(140%); transition: transform .5s ease;
}
.proof-popup.show{ transform: translateY(0); }
.proof-thumb{
  width:46px; height:46px; border-radius:9px; object-fit:cover; flex-shrink:0;
  border:1px solid var(--line);
}
.proof-body{ min-width:0; }
.proof-stars{ color: var(--amber); font-size:.72rem; letter-spacing:1px; margin-bottom:3px; }
.proof-text{ font-size:.82rem; color: var(--text-dim); line-height:1.4; }
.proof-text b{ color: var(--text); }
.proof-text .proof-loc{ color: var(--blue); font-weight:600; }
.proof-tag{ font-family: var(--font-mono); font-size:.6rem; color: var(--text-mute); opacity:.65; display:block; margin-top:5px; }

/* Blog */
.blog-hero{ padding: 60px 0 20px; }
.blog-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap:24px; }
.blog-card{ background: var(--surface); border:1px solid var(--line); border-radius: var(--radius); padding:26px; }
.blog-card .eyebrow{ margin-bottom:10px; }
.blog-card h3{ font-size:1.1rem; }
article.post{ max-width: 760px; margin:0 auto; padding: 60px 0 100px; }
article.post h1{ font-size: clamp(1.9rem,3.4vw,2.6rem); }
article.post h2{ font-size:1.5rem; margin-top:2em; }
article.post p{ font-size:1.02rem; color: var(--text-dim); }
.post-meta{ font-family: var(--font-mono); font-size:.8rem; color: var(--text-mute); margin-bottom: 24px; }
.post-cta{
  margin: 40px 0; padding: 28px; border-radius: var(--radius);
  background: var(--surface); border:1px solid rgba(79,142,255,.3);
  display:flex; justify-content:space-between; align-items:center; gap:20px; flex-wrap:wrap;
}
.inline-link{ color: var(--blue); border-bottom: 1px solid rgba(79,142,255,.4); }

/* Opt-in / lead magnet page */
.optin-hero{ padding: 90px 0; }
.optin-card{
  max-width: 440px; margin: 0 auto; background: var(--surface); border:1px solid var(--line);
  border-radius: var(--radius-lg); padding: 34px;
}
.optin-card input[type="email"], .optin-card input[type="text"]{
  width:100%; padding: 14px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg-alt); color: var(--text); font-family: var(--font-body); font-size: .95rem;
  margin-bottom: 14px;
}
.optin-note{ font-family: var(--font-mono); font-size:.72rem; color: var(--text-mute); margin-top: 14px; }

/* Legal pages */
.legal{ max-width: 800px; margin: 0 auto; padding: 70px 0 100px; }
.legal h1{ font-size: 2rem; }
.legal h2{ font-size: 1.2rem; margin-top: 2em; color: var(--text); }
.legal p, .legal li{ color: var(--text-dim); font-size: .95rem; }
.legal ul{ padding-left: 20px; list-style: disc; }
.legal li{ margin-bottom: 8px; }

@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .split{ grid-template-columns: 1fr; }
  .grid-3{ grid-template-columns: 1fr 1fr; }
  .grid-2{ grid-template-columns: 1fr; }
  .reviews{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  .guarantee{ grid-template-columns: 1fr; text-align:center; }
  .guarantee-badge{ margin: 0 auto; }
  .blog-grid{ grid-template-columns: 1fr; }
}
@media (max-width: 600px){
  .grid-3{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr; }
  section{ padding: 64px 0; }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

:focus-visible{ outline: 2px solid var(--blue); outline-offset: 2px; }