/* The Brain Song - Site Styles */
:root {
  --bg-dark: #0b1120;
  --bg-card: #151f32;
  --bg-card-hover: #1e293b;
  --border-color: #243248;
  --border-accent: #38bdf8;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #38bdf8;
  --accent-purple: #a855f7;
  --accent-gold: #f59e0b;
  --accent-gold-hover: #d97706;
  
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --container-max: 1140px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.15);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-dark);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Accessibility Focus States */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-gold);
  color: #000;
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  z-index: 9999;
  transition: top 0.2s ease;
  text-decoration: none;
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  top: 1rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(11, 17, 32, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--accent-cyan);
}

.nav-cta {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-hover));
  color: #0f172a;
  padding: 0.5rem 1.125rem;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
  transition: var(--transition);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Layout Containers */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section-padding {
  padding: 4.5rem 0;
}

/* Hero Section - Explicit Responsive Order (H1/Intro -> Visual -> CTA -> Supporting Proof) */
.hero {
  padding: 2.5rem 0 3.5rem;
  position: relative;
  background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.08) 0%, rgba(11, 17, 32, 0) 70%);
}

.hero-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-intro { order: 1; }
.hero-media { order: 2; }
.hero-cta { order: 3; }
.hero-proof { order: 4; }

@media (min-width: 900px) {
  .hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    grid-template-areas:
      "intro media"
      "cta media"
      "proof media";
    gap: 1.25rem 3rem;
    align-items: center;
  }
  .hero-intro { grid-area: intro; }
  .hero-media { grid-area: media; }
  .hero-cta { grid-area: cta; }
  .hero-proof { grid-area: proof; }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(2.1rem, 4.2vw, 3.1rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.hero-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  background-color: var(--bg-card);
}

.hero-media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.product-caption {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  padding: 0.5rem 0.75rem;
  background-color: rgba(15, 23, 42, 0.9);
  border-top: 1px solid var(--border-color);
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-hover));
  color: #0f172a;
  font-weight: 800;
  font-size: 1.0625rem;
  padding: 1.125rem 2rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.25);
  text-align: center;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.4);
}

.hero-trust-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.hero-highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hero-highlights li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text-main);
  font-size: 0.95rem;
}

.hero-highlights svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

/* Feature Cards & Grid */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.875rem;
  letter-spacing: -0.01em;
}

.section-description {
  color: var(--text-muted);
  font-size: 1.0625rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Detail Section with Image Split */
.split-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 850px) {
  .split-section {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
  .split-section.reverse {
    direction: rtl;
  }
  .split-section.reverse > * {
    direction: ltr;
  }
}

.split-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
  background: var(--bg-card);
}

.split-image img {
  width: 100%;
  height: auto;
  display: block;
}

.split-content h2 {
  font-size: 1.875rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.split-content p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

/* Who It May Suit Section */
.suitability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .suitability-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.suitability-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.suitability-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.suitability-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.suitability-card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
}

/* Customer Evidence & Reviews Section */
.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 850px) {
  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.review-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.evidence-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
  align-self: flex-start;
}

.review-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.review-card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.source-tag {
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px dashed var(--border-color);
  padding-top: 0.75rem;
}

/* Pricing / Order Card */
.pricing-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #0f172a 100%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.pricing-card {
  max-width: 640px;
  margin: 0 auto;
  background-color: var(--bg-card);
  border: 2px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-glow), var(--shadow-card);
  position: relative;
}

.pricing-badge {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.35rem 1.25rem;
  border-radius: 9999px;
}

.pricing-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.pricing-sub {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

.price-tag {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
}

.price-currency {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.price-amount {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent-gold);
  line-height: 1;
}

.price-note {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin: 1.5rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.pricing-features svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.guarantee-box {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--border-color);
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* FAQ Accordion */
.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: rgba(56, 189, 248, 0.4);
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-weight: 700;
  font-size: 1.0625rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  transition: transform 0.25s ease;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

/* Legal & Footers */
.site-footer {
  background-color: #070c16;
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand h4 {
  color: var(--text-main);
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.footer-links-title {
  color: var(--text-main);
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--accent-cyan);
}

.footer-disclaimers {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  margin-top: 2rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-copy {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
}

/* Legal Page Layouts */
.legal-page {
  padding: 3.5rem 0;
}
.legal-content {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
}
.legal-content h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}
.legal-content h2 {
  font-size: 1.25rem;
  margin: 1.75rem 0 0.75rem;
  color: var(--text-main);
}
.legal-content p {
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.7;
}
.legal-content ul {
  color: var(--text-muted);
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

/* Mobile responsive menu active state */
@media (max-width: 767px) {
  .mobile-toggle {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 1.25rem;
    gap: 1rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  }
  .nav-menu.active {
    display: flex;
  }
}