:root {
  --bg: #f4f8fd;
  --bg-card: #ffffff;
  --text: #0f2347;
  --text-secondary: #5a6b85;
  --text-muted: #8b9bb5;
  --accent: #2f6fed;
  --accent-soft: #d6e6ff;
  --accent-dark: #1a3a6e;
  --border: #d4e0f0;
  --success: #3d9b6e;
  --success-soft: #d8f3e6;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(15, 35, 71, 0.08);
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --max: 1080px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 248, 253, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(47, 111, 237, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(47, 111, 237, 0.45);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--accent-dark);
  border: 1px solid var(--border);
}

.btn-lg {
  padding: 0.9rem 1.6rem;
  font-size: 1rem;
}

/* Hero */
.hero {
  padding: 4rem 0 3.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-chile {
  background: #fff0f0;
  color: #c0392b;
}

.badge-encrypted {
  background: #e6f4ea;
  color: #1e6b45;
  border: 1px solid #b8dfc8;
}

.badge-local {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin: 0 0 1.75rem;
  max-width: 32rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.hero-note {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-visual {
  position: relative;
}

.app-preview {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
}

.preview-bar {
  display: flex;
  gap: 6px;
  padding: 12px 16px;
  background: #eef3fa;
  border-bottom: 1px solid var(--border);
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #d4e0f0;
}

.preview-dot:nth-child(1) { background: #ff6b6b; }
.preview-dot:nth-child(2) { background: #ffd93d; }
.preview-dot:nth-child(3) { background: #6bcb77; }

.preview-body {
  padding: 1.5rem;
  min-height: 280px;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 1rem;
}

.preview-sidebar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preview-nav-item {
  height: 36px;
  border-radius: 8px;
  background: var(--accent-soft);
}

.preview-nav-item:nth-child(2) { opacity: 0.5; }
.preview-nav-item:nth-child(3) { opacity: 0.35; }

.preview-main {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview-card {
  height: 56px;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--accent-soft) 0%, #eef3fa 100%);
}

.preview-card.wide { height: 80px; }
.preview-card.narrow { width: 70%; }

.preview-nf {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding: 10px 14px;
  background: var(--success-soft);
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--success);
}

.preview-nf-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Sections */
section {
  padding: 4rem 0;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.section-lead {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 36rem;
  margin: 0 0 2.5rem;
}

/* Problem / solution */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.problem-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.problem-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.problem-card.solution {
  border-color: var(--accent);
  background: linear-gradient(135deg, #f8fbff 0%, var(--accent-soft) 100%);
}

/* Neurofeedback explainer */
.nf-section {
  background: linear-gradient(180deg, var(--bg) 0%, #eef4fc 100%);
}

.nf-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.nf-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: relative;
}

.nf-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.nf-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
}

.nf-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.nf-note {
  margin: 0;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.92rem;
  color: var(--text-secondary);
  text-align: center;
}

.nf-card-title {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.page-hero {
  padding: 3rem 0 2rem;
}

.page-hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.page-hero-lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 40rem;
  margin: 0;
  line-height: 1.6;
}

.nf-muse-section {
  padding-top: 0;
}

.nf-muse-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: start;
}

.nf-muse-main h3 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.nf-muse-main p {
  margin: 0 0 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
}

.nf-muse-specs {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.nf-muse-specs div {
  padding: 0.65rem 0.85rem;
  background: var(--bg);
  border-radius: var(--radius);
}

.nf-muse-specs dt {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.15rem;
}

.nf-muse-specs dd {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 600;
}

.nf-course-section {
  background: linear-gradient(180deg, #eef4fc 0%, var(--bg) 100%);
}

.nf-course-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.nf-course-content h3 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.nf-course-list {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.nf-course-note {
  margin: 0 0 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.nf-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.nf-gallery-placeholder {
  grid-column: 1 / -1;
  min-height: 200px;
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  color: var(--text-secondary);
}

.nf-gallery-placeholder span {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.nf-gallery-placeholder p {
  margin: 0;
  font-weight: 600;
  color: var(--text);
}

.nf-gallery-placeholder small {
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.nf-gallery-placeholder--dim {
  grid-column: auto;
  min-height: 120px;
}

.nf-gallery-placeholder--dim span {
  font-size: 1.25rem;
}

.nf-faq-section {
  padding-top: 0;
}

.nf-faq {
  margin: 0;
}

.nf-faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
}

.nf-faq-item dt {
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.nf-faq-item dd {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.nav-links a.nav-active {
  color: var(--accent);
  font-weight: 600;
}

.feature-link {
  margin: 0.75rem 0 0;
  font-size: 0.88rem;
  font-weight: 600;
}

.feature-link a {
  color: var(--accent);
  text-decoration: none;
}

.feature-link a:hover {
  text-decoration: underline;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.feature-icon.blue { background: var(--accent-soft); }
.feature-icon.green { background: var(--success-soft); }
.feature-icon.purple { background: #e8dff5; }

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Pricing */
.pricing-section {
  background: linear-gradient(180deg, var(--bg) 0%, #e8f1fb 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

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

.pricing-card.featured {
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(47, 111, 237, 0.15);
  position: relative;
}

.pricing-card.featured::before {
  content: "Recomendado";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
}

.pricing-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
}

.pricing-price {
  font-size: 2rem;
  font-weight: 800;
  margin: 0.75rem 0;
  letter-spacing: -0.03em;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pricing-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.pricing-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  flex: 1;
}

.pricing-list li {
  padding: 0.4rem 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 1.5rem;
  position: relative;
}

.pricing-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

.pricing-card .btn {
  width: 100%;
}

.founder-note {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: #fff6d6;
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: #7a5c00;
  text-align: center;
}

/* Requirements */
.req-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.req-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.req-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.req-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Install */
.install-steps {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.install-steps ol {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-secondary);
}

.install-steps li {
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

.install-steps li strong {
  color: var(--text);
}

/* CTA */
.cta-section {
  padding: 5rem 0;
}

.cta-box {
  background: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent) 100%);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
  color: #fff;
}

.cta-box h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.cta-box p {
  margin: 0 0 1.75rem;
  opacity: 0.9;
  font-size: 1.05rem;
  max-width: 32rem;
  margin-inline: auto;
}

.cta-box .btn-primary {
  background: #fff;
  color: var(--accent-dark);
  box-shadow: none;
}

.cta-box .btn-primary:hover {
  background: #f0f4ff;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid,
  .problem-grid,
  .nf-grid,
  .nf-muse-card,
  .nf-course-grid,
  .features-grid,
  .pricing-grid,
  .req-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.5rem;
  }

  .hero-visual {
    order: -1;
  }

  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: 0.75rem;
  }

  .nav-toggle {
    display: block;
  }

  .nav-inner {
    position: relative;
  }
}