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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  line-height: 1.5;
  color: #1a1d24;
  background: #f5f6f8;
}

a {
  color: #0d47a1;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid #0d47a1;
  outline-offset: 2px;
}

.page {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.site-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.app-icon {
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 1.35rem;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.06),
    0 8px 24px rgba(0, 0, 0, 0.08);
  display: block;
  margin: 0 auto 1.25rem;
}

.site-title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0 auto;
  max-width: 28rem;
  font-size: 1.05rem;
  color: #4a5160;
}

.download-wrap {
  text-align: center;
  margin-bottom: 2.75rem;
}

.download-button {
  display: inline-block;
  padding: 0.9rem 1.75rem;
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  color: #fff;
  background: #0d47a1;
  border-radius: 0.5rem;
  box-shadow: 0 2px 8px rgba(13, 71, 161, 0.35);
}

.download-button:hover {
  background: #0a3d8a;
  text-decoration: none;
}

.download-button:focus-visible {
  outline: 2px solid #0d47a1;
  outline-offset: 3px;
}

.download-hint {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  color: #6b7280;
}

.features h2 {
  margin: 0 0 1rem;
  font-size: 1.125rem;
  font-weight: 650;
  color: #374151;
}

.feature-group {
  margin-bottom: 1.75rem;
}

.feature-group:last-child {
  margin-bottom: 0;
}

.feature-group h3 {
  margin: 0 0 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #6b7280;
}

.feature-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 0.65rem 0;
  border-bottom: 1px solid #e5e7eb;
}

.feature-list li:first-child {
  padding-top: 0;
}

.feature-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.feature-title {
  display: block;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.feature-desc {
  display: block;
  font-size: 0.925rem;
  color: #4b5563;
}

.site-footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e5e7eb;
  text-align: center;
  font-size: 0.8125rem;
  color: #9ca3af;
}

.site-footer .site-version {
  margin: 0.35rem 0 0;
  font-size: 0.8125rem;
}