/* ── Sticky Header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background-color: rgba(0, 0, 0, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  padding: var(--space-3) 0;
  opacity: 0;
  transform: translateY(-100%);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}

.site-header.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  display: flex;
  align-items: center;
}

.header-logo:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.header-wordmark {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-primary);
  line-height: 1;
}

.btn-sm {
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* ── Mobile Sticky CTA Bar ── */
.mobile-cta-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background-color: rgba(0, 0, 0, 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-default);
  padding: var(--space-3) var(--space-4);
  padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0px));
  opacity: 0;
  transform: translateY(100%);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}

.mobile-cta-bar.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

@media (max-width: 767px) {
  .mobile-cta-bar {
    display: block;
  }
}

.mobile-cta-bar .btn {
  width: 100%;
}

/* ── Section / Inline CTAs ── */
.section-cta {
  text-align: center;
  padding: var(--space-8) 0;
}

.inline-cta {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  min-height: 44px;
  line-height: 44px;
  transition: color 0.15s ease;
}

.inline-cta:hover {
  color: var(--text-primary);
}

.inline-cta:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* ── Footer Branding ── */
.footer-logo {
  display: flex;
  align-items: center;
}

.footer-logo:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.footer-wordmark {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
  line-height: 1;
}

/* ── App Store Link ── */
.app-store-link:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.app-store-badge-center {
  margin: 0 auto;
}

/* ── Reduced motion: disable header/CTA slide animations ── */
@media (prefers-reduced-motion: reduce) {
  .site-header,
  .mobile-cta-bar {
    transition: none;
  }

  .site-header {
    transform: none;
  }

  .mobile-cta-bar {
    transform: none;
  }
}

/* ── Feature Benefit Subline ── */
.feature-benefit {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-muted);
  margin-top: var(--space-2);
  margin-bottom: var(--space-3);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 0;
  box-shadow: none;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.85;
}

.btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-secondary:hover {
  border-color: var(--text-subtle);
}

.btn-full {
  width: 100%;
}

.btn-lg {
  min-height: 56px;
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* ── App Store Badge ── */
.app-store-badge {
  height: 48px;
  width: auto;
  transition: opacity 0.15s ease;
}

.app-store-badge:hover {
  opacity: 0.85;
}

/* ── Cards ── */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: 0;
  box-shadow: none;
  padding: var(--space-6);
  transition: border-color 0.15s ease;
}

.card--surface {
  background-color: var(--bg-surface);
}

.card--highlighted {
  border-width: 2px;
  border-color: var(--text-primary);
}

/* ── Contrast cards (problem section) ── */
.contrast-card {
  padding: var(--space-8);
}

.contrast-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}

.contrast-icon {
  flex-shrink: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-base);
  font-weight: 700;
  line-height: var(--leading-snug);
}

.contrast-icon--negative {
  color: var(--data-negative);
}

.contrast-icon--positive {
  color: var(--data-positive);
}

.contrast-text {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 400;
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
}

/* ── Feature blocks ── */
.feature-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}

.feature-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-hero);
  font-weight: 700;
  color: var(--text-subtle);
  line-height: 1;
  margin-bottom: var(--space-4);
}

.feature-screenshot {
  background-color: var(--bg-card);
  border: 1px solid var(--border-default);
  aspect-ratio: 9 / 16;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 280px;
  margin: 0 auto;
  overflow: hidden;
}

.feature-screenshot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-screenshot-placeholder {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xs);
  color: var(--text-disabled);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

/* ── Steps ── */
.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.step-card {
  text-align: center;
  padding: var(--space-8) var(--space-6);
}

.step-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-hero);
  font-weight: 700;
  color: var(--data-positive);
  line-height: 1;
  margin-bottom: var(--space-4);
}

.step-label {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

/* ── Stats ── */
.stat {
  text-align: center;
  padding: var(--space-6);
}

.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-title);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ── Testimonials ── */
.testimonial {
  padding: var(--space-6);
  border-top: 1px solid var(--border-default);
}

.testimonial-text {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 400;
  font-style: italic;
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.testimonial-author {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: var(--tracking-normal);
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ── Algorithm cards ── */
.algo-card {
  padding: var(--space-6);
}

.algo-card .row-title {
  margin-bottom: var(--space-3);
}

.algo-formula {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--data-positive);
  background-color: var(--bg-primary);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-default);
  margin-top: var(--space-3);
  overflow-x: auto;
  white-space: nowrap;
}

/* ── Pricing ── */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: 640px;
  margin: 0 auto;
}

.pricing-card {
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
}

.pricing-header {
  min-height: 28px;
  margin-bottom: var(--space-4);
}

.pricing-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--data-positive);
  border: 1px solid var(--data-positive);
  padding: var(--space-1) var(--space-3);
}

.pricing-price {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-hero);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.pricing-period {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-billed {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-muted);
  margin-top: var(--space-2);
}

.pricing-features {
  list-style: none;
  margin-top: var(--space-6);
  padding: 0;
  flex: 1;
}

.pricing-features li {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-secondary);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.pricing-features li::before {
  content: '+';
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  color: var(--data-positive);
  flex-shrink: 0;
}

.pricing-features li:last-child {
  border-bottom: none;
}

/* ── FAQ ── */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-default);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6) 0;
  font-family: 'Inter', sans-serif;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color 0.15s ease;
}

.faq-item summary:hover {
  color: var(--text-secondary);
}

.faq-item summary:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: -2px;
}

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

.faq-item summary::after {
  content: '+';
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 400;
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  padding-bottom: var(--space-6);
}

/* ── Footer ── */
.footer {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--border-default);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-link {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-link:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.footer-copy {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xs);
  color: var(--text-subtle);
}

/* ── Hero layout ── */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: var(--space-16) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.hero-subtitle {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  max-width: 480px;
}

.hero-price {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-subtle);
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.hero-phone {
  display: none;
  justify-content: center;
}

.hero-phone-frame {
  background-color: var(--bg-card);
  border: 1px solid var(--border-default);
  width: 100%;
  max-width: 300px;
  aspect-ratio: 9 / 19;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-phone-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── iOS badge ── */
.ios-only {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--text-subtle);
  letter-spacing: var(--tracking-normal);
  text-transform: uppercase;
}

/* ── Inline text utilities ── */
.block {
  display: block;
}

.text-constrain {
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.text-constrain-sm {
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Responsive ── */
@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-phone {
    display: flex;
  }

  .hero-title {
    font-size: 56px;
  }

  .feature-block {
    grid-template-columns: 1fr 1fr;
  }

  .feature-block--reverse .feature-content {
    order: 2;
  }

  .feature-block--reverse .feature-visual {
    order: 1;
  }

  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .hero-phone-frame {
    max-width: 340px;
  }
}