* {
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #000;
  background: #fff;
}

.site-nav {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  font-size: 14px;
  gap: 20px;
}

.nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  font-size: 14px;
}

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

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: flex;
  width: 18px;
  height: 1.5px;
  margin: 0 auto;
  background: black;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle span + span {
  margin-top: 5px;
}

.site-nav a {
  margin-left: 20px;
  text-decoration: none;
  color: black;
}

.brand-link {
  color: inherit;
  text-decoration: none;
}

.qa-page {
  min-height: calc(100vh - 120px);
  padding: 24px 20px 80px;
  background:
    radial-gradient(circle at top, rgba(0, 0, 0, 0.04), transparent 35%),
    linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%);
}

.qa-hero,
.qa-grid {
  max-width: 1120px;
  margin: 0 auto;
}

.qa-hero {
  padding: 72px 20px 44px;
  text-align: center;
}

.qa-eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #666;
}

.qa-hero h1 {
  max-width: 860px;
  margin: 0 auto 20px;
  font-size: clamp(38px, 6vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.qa-lead {
  max-width: 720px;
  margin: 0 auto;
  font-size: 18px;
  line-height: 1.7;
  color: #555;
}

.qa-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.qa-card {
  padding: 28px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.06);
}

.qa-card h2 {
  margin: 0 0 14px;
  font-size: 26px;
  line-height: 1.2;
}

.qa-card p {
  margin: 0 0 14px;
  color: #444;
  line-height: 1.7;
}

.qa-card-wide {
  grid-column: 1 / -1;
  text-align: center;
}

.qa-list {
  margin: 0 0 14px;
  padding-left: 0;
  list-style: none;
}

.qa-list li {
  margin-bottom: 10px;
  color: #444;
  line-height: 1.7;
}

footer {
  text-align: center;
  padding: 40px;
  color: #999;
  font-size: 14px;
}

@media (max-width: 640px) {
  .site-nav {
    padding: 14px 20px;
    display: block;
    gap: 0;
  }

  .nav-top {
    gap: 12px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    display: none;
    margin-top: 12px;
    padding: 12px;
    border-radius: 18px;
    background: rgba(245, 245, 247, 0.94);
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.08);
  }

  .site-nav.nav-open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .site-nav.nav-open .nav-toggle span:first-child {
    transform: translateY(3.25px) rotate(45deg);
  }

  .site-nav.nav-open .nav-toggle span:last-child {
    transform: translateY(-3.25px) rotate(-45deg);
  }

  .site-nav a {
    margin-left: 0;
    padding: 12px 14px;
    border-radius: 12px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.04);
  }

  .qa-page {
    padding-left: 16px;
    padding-right: 16px;
  }

  .qa-hero {
    padding: 52px 4px 32px;
  }

  .qa-lead {
    font-size: 16px;
  }

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

  .qa-card,
  .qa-card-wide {
    padding: 24px 20px;
    border-radius: 22px;
  }

  .qa-card h2 {
    font-size: 22px;
  }
}