:root {
  --color-bg: #ffffff;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-surface: #f5f5f7;
  --color-border: #d2d2d7;
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max-width: 980px;
  --radius: 12px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-system);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  text-decoration: underline;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo img {
  border-radius: 6px;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 400;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

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

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  margin: 4px 0;
  border-radius: 1px;
  transition: transform 0.2s;
}

/* Hero */
.hero {
  text-align: center;
  padding: 5rem 1.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.5;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-text);
  color: #fff;
  padding: 0.875rem 1.75rem;
  border-radius: 980px;
  font-size: 1rem;
  font-weight: 500;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background: #333;
  text-decoration: none;
  transform: scale(1.02);
}

.btn-primary svg {
  width: 20px;
  height: 20px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent);
  padding: 0.875rem 1.75rem;
  border-radius: 980px;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  transition: border-color 0.2s, transform 0.1s;
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  text-decoration: none;
  transform: scale(1.02);
}

/* Hero screenshot */
.hero-image {
  margin-top: 3rem;
  display: flex;
  justify-content: center;
}

.hero-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* Features */
.features {
  padding: 5rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  text-align: center;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

.feature-card {
  padding: 2rem;
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-2px);
}

.feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--color-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

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

/* How it works */
.how-it-works {
  padding: 5rem 1.5rem;
  background: var(--color-surface);
}

.how-it-works-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

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

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

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-text);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.step h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Keyboard shortcuts section */
.shortcuts {
  padding: 5rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.shortcut-table {
  max-width: 560px;
  margin: 2rem auto 0;
}

.shortcut-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--color-border);
}

.shortcut-row:last-child {
  border-bottom: none;
}

.shortcut-keys {
  display: flex;
  gap: 0.25rem;
}

.key {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.25rem 0.625rem;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--font-system);
  color: var(--color-text);
}

.shortcut-action {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* CTA section */
.cta-section {
  padding: 5rem 1.5rem;
  text-align: center;
  background: var(--color-surface);
}

.cta-section h2 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

/* Footer */
.footer {
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

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

/* Legal pages */
.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.legal h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.legal .last-updated {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

.legal h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.legal p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.legal ul {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.legal li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0.25rem;
}

/* Contact page */
.contact {
  max-width: 560px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  text-align: center;
}

.contact h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.contact p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-accent);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }

  .hero .subtitle {
    font-size: 1.0625rem;
  }

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

  .steps {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .cta-section h2 {
    font-size: 1.75rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 52px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(20px);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}