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

html {
  scroll-behavior: auto;
}

body {
  background: #F4F6F8;
  color: #1f2a2a;
  font-family: Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

a {
  color: #128C7E;
  text-decoration: none;
}

a:hover {
  color: #0d6b60;
}

.narrow {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

.top {
  background: #ffffff;
  border-bottom: 1px solid #e2e7ec;
}

.top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  gap: 16px;
}

.brand-left {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #111;
  font-weight: 700;
}

.chapters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.chapters a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #334;
}

.chapters a:hover,
.chapters a:focus {
  color: #128C7E;
}

.chapters b {
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background: #25D366;
  color: #111;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.hero-center {
  text-align: center;
  padding: 48px 0 28px;
}

.hero-center h1 {
  font-size: 30px;
  line-height: 1.4;
  color: #128C7E;
  margin-bottom: 16px;
}

.hero-center p {
  margin: 0 auto 12px;
  max-width: 720px;
}

.progress {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  margin-top: 28px;
}

.progress-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #128C7E;
}

.progress-item i {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: #25D366;
  display: block;
}

.band {
  padding: 36px 0;
}

.band h2 {
  font-size: 22px;
  color: #128C7E;
  margin-bottom: 10px;
}

.note {
  margin-bottom: 20px;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.wide-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 22px 22px 22px 20px;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: start;
}

.badge {
  width: 64px;
  height: 64px;
  border-radius: 999px;
  background: #25D366;
  color: #111;
  font-size: 26px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.wide-card h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.panel {
  background: #ffffff;
  border-radius: 16px;
  padding: 20px;
}

.panel h3 {
  margin: 8px 0 8px;
}

.panel .pic {
  width: 34px;
  height: 34px;
  color: #128C7E;
}

.fail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.faq-box {
  background: #ffffff;
  border-radius: 16px;
  padding: 8px 20px;
}

.faq-box details {
  padding: 14px 0;
  border-bottom: 1px solid #e2e7ec;
}

.faq-box details:last-child {
  border-bottom: none;
}

.faq-box summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.faq-box summary::-webkit-details-marker {
  display: none;
}

.faq-box details[open] summary {
  color: #128C7E;
}

.faq-box p {
  margin-top: 8px;
}

.end {
  background: #e8ecf0;
  padding: 28px 0;
}

.end-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

.end-brand {
  font-weight: 700;
  white-space: nowrap;
}

.end-copy p {
  font-size: 13px;
  margin-bottom: 8px;
  max-width: 560px;
}

@media (max-width: 800px) {
  .top-row,
  .end-row,
  .two,
  .fail,
  .wide-card {
    display: block;
  }

  .badge {
    margin-bottom: 12px;
  }

  .hero-center h1 {
    font-size: 24px;
  }

  .chapters {
    padding-bottom: 12px;
  }
}