/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #f1f5f9;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: #eff6ff;
  --color-accent: #10b981;
  --font-sans:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial,
    sans-serif;
  --font-mono: 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f0f0f;
    --color-bg-secondary: #1a1a1a;
    --color-bg-tertiary: #252525;
    --color-text: #f0f0f0;
    --color-text-muted: #9ca3af;
    --color-border: #2d2d2d;
    --color-primary: #60a5fa;
    --color-primary-hover: #3b82f6;
    --color-primary-light: #1e3a5f;
    --color-accent: #34d399;
  }
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navbar */
.navbar {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-right {
  display: flex;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.125rem;
}

.nav-logo {
  width: 24px;
  height: 24px;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
  padding: 4rem 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.hero-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: block;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-subheadline {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Hero Screenshot */
.hero-screenshot {
  padding: 3rem 0 4rem;
  background: var(--color-bg);
}

.hero-screenshot .container {
  max-width: 1200px;
}

.hero em {
  font-style: normal;
  color: var(--color-primary);
}

.main-screenshot {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 0.75rem;
  box-shadow:
    0 10px 25px rgba(0, 0, 0, 0.1),
    0 4px 10px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
}

/* Problem Section */
.problem {
  padding: 4rem 0;
}

.problem .container {
  max-width: 640px;
}

.problem h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
  text-align: center;
}

.problem-intro {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.problem-intro em {
  font-style: italic;
  color: var(--color-text);
}

.problem-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

.problem-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  text-align: center;
}

.problem-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.problem-hard {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.problem-hard em {
  font-style: italic;
  color: var(--color-primary);
  font-weight: 500;
}

.problem-conclusion em {
  font-style: normal;
  color: var(--color-primary);
}

.problem-pullquote {
  font-size: 1.25rem;
  line-height: 1.7;
  margin: 2.5rem 0;
  padding: 2rem;
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0.5rem;
  font-weight: 500;
}

.problem-pullquote em {
  font-style: italic;
  color: var(--color-primary);
  font-weight: 600;
}

.problem-failures {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

.failure-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  text-align: center;
  position: relative;
}

.failure-card::before {
  content: '≠';
  display: block;
  font-size: 1.5rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  font-weight: 300;
}

.failure-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.problem-conclusion {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.7;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* Infographic Section */
.infographic-section {
  padding: 4rem 0;
  background: var(--color-bg-tertiary);
  border-top: 1px solid var(--color-border);
}

.infographic-section .container {
  max-width: 1200px;
}

.infographic {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 0.75rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Pillars Section */
.pillars {
  padding: 4rem 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.pillars h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: -0.01em;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.pillar {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 2rem;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pillar-number {
  position: absolute;
  top: -0.75rem;
  left: 1.5rem;
  background: var(--color-primary);
  color: white;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.pillar h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.pillar-concept {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
  font-style: italic;
}

.pillar-features {
  list-style: none;
  margin-bottom: 1rem;
}

.pillar-features li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.pillar-features li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.pillar-outcome {
  font-size: 0.875rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.pillar-outcome strong {
  color: var(--color-primary);
}

.pillar-outcome em {
  font-style: italic;
}

/* Cycle Demo Section */
.cycle-demo {
  padding: 4rem 0;
}

.cycle-demo h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.cycle-intro {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
}

.cycle-steps {
  max-width: 640px;
  margin: 0 auto;
}

.cycle-step {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.step-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

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

/* Features Demo Section */
.features-demo {
  padding: 4rem 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.features-demo h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 2rem;
  letter-spacing: -0.01em;
}

/* Tabs */
.tabs {
  max-width: 100%;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.tab-button {
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-button:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
  background: var(--color-bg);
}

.tab-button.active {
  color: white;
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.tab-description {
  text-align: center;
  margin-bottom: 2rem;
}

.tab-description p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 640px;
  margin: 0 auto;
}

.tab-image {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.tab-image img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 0.5rem;
}

/* Agent System Section */
.agent-system {
  padding: 4rem 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.agent-system h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.agent-intro {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto 3rem;
  font-size: 1.125rem;
}

.agent-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.agent-feature {
  text-align: center;
  padding: 1.5rem;
}

.agent-feature h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

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

/* Differentiation Section */
.differentiation {
  padding: 4rem 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.differentiation h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.differentiation-intro {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 2.5rem;
}

.differentiation-content {
  max-width: 640px;
  margin: 0 auto;
}

.differentiation-point {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.differentiation-point strong {
  color: var(--color-primary);
  font-weight: 600;
}

.differentiation-point em {
  font-style: italic;
}

.differentiation-conclusion {
  font-size: 1rem;
  line-height: 1.7;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text);
  font-weight: 500;
}

/* Trust Section */
.trust {
  padding: 4rem 0;
}

.trust h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 2.5rem;
  letter-spacing: -0.01em;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.trust-item {
  text-align: center;
  padding: 1rem;
}

.trust-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.trust-item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.trust-conclusion {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  max-width: 640px;
  margin: 0 auto;
}

/* Personas Section */
.personas {
  padding: 4rem 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.personas h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 2.5rem;
  letter-spacing: -0.01em;
}

.personas-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.persona {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.persona h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

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

/* Download Section */
.download {
  padding: 4rem 0;
}

.download h2 {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.download-intro {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}

.download-beta-notice {
  max-width: 640px;
  margin: 0 auto 3rem;
  padding: 1rem 1.5rem;
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary);
  border-radius: 0.5rem;
  text-align: center;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text);
}

.download-beta-notice strong {
  color: var(--color-primary);
  font-weight: 600;
}

.download-platforms {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: 640px;
  margin: 0 auto;
}

.download-button {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.2s ease;
}

.download-button:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.1),
    0 2px 4px rgba(0, 0, 0, 0.06);
}

.download-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.download-details {
  flex: 1;
}

.download-platform {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

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

/* Final CTA Section */
.final-cta {
  padding: 4rem 0;
  text-align: center;
}

.final-cta h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.cta-tagline {
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.button.primary {
  background: var(--color-primary);
  color: white;
}

.button.primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.button.secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.button.secondary:hover {
  background: var(--color-primary-light);
}

/* Newsletter form */
.embeddable-buttondown-form {
  max-width: 480px;
  margin: 2rem auto;
  padding: 2rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
}

.embeddable-buttondown-form label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.embeddable-buttondown-form input[type='email'] {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  transition: all 0.2s ease;
}

.embeddable-buttondown-form input[type='email']::placeholder {
  color: var(--color-text-muted);
}

.embeddable-buttondown-form input[type='email']:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.embeddable-buttondown-form input[type='submit'] {
  width: 100%;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: white;
  background: var(--color-primary);
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.embeddable-buttondown-form input[type='submit']:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.embeddable-buttondown-form input[type='submit']:active {
  transform: translateY(0);
}

.embeddable-buttondown-form p {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.embeddable-buttondown-form p a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.embeddable-buttondown-form p a:hover {
  color: var(--color-text);
}

/* Footer */
footer {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
}

footer .container {
  display: flex;
  justify-content: center;
  align-items: center;
}

footer p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }

  .nav-left {
    gap: 1rem;
  }

  .nav-link {
    font-size: 0.875rem;
  }

  .hero {
    padding: 4rem 0 3rem;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-subheadline {
    font-size: 1.125rem;
  }

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

  .hero-screenshot .container {
    padding: 0 1rem;
  }

  .main-screenshot {
    border-radius: 0.5rem;
  }

  .infographic-section {
    padding: 3rem 0;
  }

  .infographic-section .container {
    padding: 0 1rem;
  }

  .infographic {
    border-radius: 0.5rem;
  }

  .problem h2,
  .pillars h2,
  .cycle-demo h2,
  .features-demo h2,
  .agent-system h2,
  .differentiation h2,
  .trust h2,
  .personas h2,
  .download h2,
  .final-cta h2 {
    font-size: 1.5rem;
  }

  .problem-list {
    grid-template-columns: 1fr;
  }

  .problem-failures {
    grid-template-columns: 1fr;
  }

  .problem-pullquote {
    font-size: 1.125rem;
    padding: 1.5rem;
    margin: 2rem 0;
  }

  .pillars-grid {
    grid-template-columns: 1fr;
  }

  .tab-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .tab-button {
    width: 100%;
  }

  .agent-features {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .personas-grid {
    grid-template-columns: 1fr;
  }

  .download-platforms {
    grid-template-columns: 1fr;
  }

  .comparison {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }

  .comparison-item {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 3rem 0 2rem;
  }

  .hero-logo {
    width: 60px;
    height: 60px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-subheadline {
    font-size: 1rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta .button {
    justify-content: center;
  }

  .hero-screenshot {
    padding: 1.5rem 0 2rem;
  }

  .problem,
  .pillars,
  .cycle-demo,
  .features-demo,
  .agent-system,
  .differentiation,
  .trust,
  .personas,
  .download,
  .final-cta {
    padding: 3rem 0;
  }

  .problem-pullquote {
    font-size: 1rem;
    padding: 1.25rem;
  }

  .trust-grid {
    grid-template-columns: 1fr;
  }

  .pillar {
    padding: 1.5rem;
  }

  .cycle-step {
    gap: 1rem;
  }

  .step-number {
    width: 1.75rem;
    height: 1.75rem;
    font-size: 0.75rem;
  }

  .tab-button {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
  }
}