*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #1f2937;
  background: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: #b45309; text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

.io-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid #f3f4f6;
  max-width: 1120px;
  margin: 0 auto;
}
.io-nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: #111827;
}
.io-nav__brand img { height: 40px; width: auto; display: block; }
.io-nav__cta {
  background: #eab308;
  color: #111827;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}
.io-nav__cta:hover { background: #ca8a04; text-decoration: none; }

.io-container { max-width: 880px; margin: 0 auto; padding: 0 24px; }

.io-hero { padding: 64px 0 48px; text-align: center; }
.io-hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  margin: 0 0 16px;
  color: #111827;
  letter-spacing: -0.02em;
}
.io-hero p {
  font-size: clamp(16px, 2vw, 19px);
  color: #4b5563;
  max-width: 640px;
  margin: 0 auto 28px;
}
.io-cta {
  display: inline-block;
  background: #eab308;
  color: #111827;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 16px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.io-cta:hover { background: #ca8a04; text-decoration: none; }
.io-cta__hint {
  display: block;
  font-size: 13px;
  color: #6b7280;
  margin-top: 10px;
}

.io-section { padding: 48px 0; }
.io-section h2 {
  font-size: clamp(22px, 3vw, 30px);
  margin: 0 0 24px;
  color: #111827;
  letter-spacing: -0.01em;
}
.io-intro p { font-size: 17px; color: #374151; margin: 0 0 16px; }

.io-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.io-feature {
  padding: 20px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #fafaf9;
}
.io-feature h3 { margin: 0 0 8px; font-size: 17px; color: #111827; }
.io-feature p { margin: 0; color: #4b5563; font-size: 15px; }

.io-screenshot {
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  margin: 24px 0;
}

.io-faq details {
  border-bottom: 1px solid #e5e7eb;
  padding: 14px 0;
}
.io-faq summary {
  cursor: pointer;
  font-weight: 600;
  color: #111827;
  font-size: 16px;
}
.io-faq p { color: #4b5563; margin: 8px 0 0; }

.io-footer {
  border-top: 1px solid #f3f4f6;
  padding: 32px 24px;
  margin-top: 64px;
  color: #6b7280;
  font-size: 14px;
}
.io-footer__inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.io-footer__links { display: flex; flex-wrap: wrap; gap: 12px 20px; }
.io-footer__links a { color: #4b5563; }
.io-footer__related {
  border-top: 1px solid #f3f4f6;
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 13px;
}
.io-footer__related strong { color: #374151; margin-right: 4px; }