:root {
  --color-bg: #fafaf9;
  --color-text: #1a1a1a;
  --color-text-light: #6b6b6b;
  --color-accent: #2b5bff;
  --color-accent-hover: #1e42cc;
  --color-border: #e5e5e5;
  --color-surface: #ffffff;
  --color-error: #dc2626;
  --color-success: #16a34a;

  --font-display: "Crimson Pro", serif;
  --font-body: "DM Sans", sans-serif;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 6rem;

  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-wide {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
header {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.9);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.download-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}

/* Hero Section */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Section */
section {
  padding: var(--spacing-xl) 0;
  animation: fadeInUp 0.8s ease-out;
  animation-fill-mode: both;
}

section:nth-child(2) {
  animation-delay: 0.1s;
}
section:nth-child(3) {
  animation-delay: 0.2s;
}
section:nth-child(4) {
  animation-delay: 0.3s;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

/* Problem Cards */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.problem-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  transition: var(--transition);
}

.problem-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.problem-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.problem-card p {
  color: var(--color-text-light);
  line-height: 1.7;
}

/* Tool comparison */
.tool-list {
  display: grid;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.tool-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
}

.tool-item h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.tool-problems {
  list-style: none;
  display: grid;
  gap: var(--spacing-xs);
}

.tool-problems li {
  color: var(--color-text-light);
  padding-left: 1.5rem;
  position: relative;
}

.tool-problems li::before {
  content: "✕";
  position: absolute;
  left: 0;
  color: var(--color-error);
  font-weight: 700;
}

/* Feature list */
.feature-list {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.feature-item {
  display: grid;
  gap: var(--spacing-sm);
}

.feature-item h3 {
  font-size: 1.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.feature-item p {
  color: var(--color-text-light);
  line-height: 1.7;
}

.feature-example {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin-top: var(--spacing-sm);
  font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
  font-size: 0.9rem;
}

.feature-example strong {
  display: block;
  color: var(--color-text-light);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  font-family: var(--font-body);
}

.feature-example-result {
  color: var(--color-success);
  margin-top: var(--spacing-sm);
}

/* How it works */
.steps {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  counter-reset: step;
}

.step {
  display: grid;
  gap: var(--spacing-sm);
  position: relative;
  padding-left: 3rem;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}

.step h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.step p {
  color: var(--color-text-light);
  line-height: 1.7;
}

/* Who is this for */
.audience-grid {
  display: grid;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.app-item.right::before {
  content: "✓";
  color: var(--color-success);
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

.audience-item {
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.audience-item.positive::before {
  content: "✓";
  color: var(--color-success);
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

.audience-item.negative {
  background: transparent;
  border-style: dashed;
}

.audience-item.negative::before {
  content: "✕";
  color: var(--color-error);
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

/* Privacy section */
.privacy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.privacy-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
}

.privacy-card h4 {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.privacy-card ul {
  list-style: none;
  color: var(--color-text-light);
}

.privacy-card li {
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: var(--spacing-xs);
}

.privacy-card li::before {
  content: "•";
  position: absolute;
  left: 0;
}

/* Founder section */
.founder {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-lg);
  text-align: center;
}

.founder h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.founder p {
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.beta-benefits {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  text-align: left;
}

.beta-benefits h4 {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.beta-benefits ul {
  list-style: none;
  display: grid;
  gap: var(--spacing-xs);
}

.beta-benefits li {
  color: var(--color-text-light);
  padding-left: 1.5rem;
  position: relative;
}

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

.contact-links {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.contact-links a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

/* CTA Section */
.cta-section {
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  margin-top: var(--spacing-2xl);
}

.cta-section h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-lg);
  font-size: 1.125rem;
}

.cta-meta {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
  margin-top: var(--spacing-md);
}

/* Button */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  background: var(--color-accent);
  color: white;
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font-body);
}

.btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(43, 91, 255, 0.3);
}

.btn-large {
  padding: 1.125rem 2.5rem;
  font-size: 1.125rem;
}

.btn-outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: var(--color-bg);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: none;
}

/* Footer */
footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

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

  .section-title {
    font-size: 2rem;
  }

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

  .cta-section h2 {
    font-size: 2rem;
  }
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition:
      opacity 0.6s ease-out,
      transform 0.6s ease-out;
  }

  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }
}