.about-shell {
  max-width: 960px;
}

.about-header {
  gap: 24px;
}

.about-brand .brand-name {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: .3px;
}

.about-return {
  flex: none;
  color: var(--green);
  font-size: 12px;
  text-decoration: none;
}

.about-return span {
  margin-left: 5px;
}

.about-return:hover,
.about-footer a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.about-intro {
  padding: 48px 0 42px;
  max-width: 760px;
}

.about-free {
  display: inline-block;
  padding: 5px 9px;
  border-radius: 5px;
  color: var(--green);
  background: var(--green-light);
  font-size: 11px;
  letter-spacing: .4px;
}

.about-intro h1 {
  margin: 16px 0;
  font-size: clamp(26px, 3.5vw, 34px);
  line-height: 1.5;
  letter-spacing: .2px;
}

.about-intro p {
  margin: 0;
  color: #64705f;
  font-size: 14px;
  line-height: 2;
}

.about-intro .about-subtitle {
  margin: -4px 0 15px;
  color: var(--green);
  font-size: 17px;
  font-weight: 500;
}

.about-start {
  margin-top: 23px;
}

.about-section {
  margin-bottom: 30px;
}

.about-section h2 {
  margin: 0 0 17px;
  font-size: 20px;
  font-weight: 600;
}

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

.about-card {
  padding: 26px;
  background: var(--paper);
  border: 1px solid #e1e4d9;
  border-radius: 13px;
}

.about-card h3 {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 16px;
  font-weight: 600;
}

.about-card p {
  margin: 0;
  color: #64705f;
  font-size: 13px;
  line-height: 1.95;
}

.about-card p + p {
  margin-top: 12px;
}

.about-steps-card {
  margin-top: 8px;
}

.about-steps {
  margin: 0;
  padding-left: 24px;
}

.about-steps li {
  padding-left: 6px;
}

.about-steps li::marker {
  color: var(--green);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.about-steps li + li {
  margin-top: 20px;
}

.about-steps h3 {
  font-size: 14px;
  margin-bottom: 5px;
}

.about-faq {
  margin: 0;
  border-top: 1px solid var(--line);
}

.about-faq > div {
  padding: 21px 0;
  border-bottom: 1px solid var(--line);
}

.about-faq dt {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.8;
}

.about-faq dd {
  margin: 7px 0 0;
  color: #64705f;
  font-size: 13px;
  line-height: 1.95;
}

.about-data-note h2 {
  font-size: 16px;
  margin-bottom: 8px;
}

.about-data-note p {
  margin: 0;
  color: #778171;
  font-size: 12px;
  line-height: 1.95;
}

.about-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  margin-top: 38px;
  border-top: 1px solid var(--line);
  color: #778171;
  font-size: 11px;
  line-height: 1.8;
}

.about-footer a {
  flex: none;
  color: var(--green);
  text-decoration: none;
}

@media (max-width: 760px) {
  .about-header {
    min-height: 85px;
    height: auto;
    padding: 20px 0;
    gap: 16px;
  }

  .about-brand {
    gap: 10px;
  }

  .about-brand .brand-mark {
    flex: none;
  }

  .about-brand .brand-name {
    font-size: 17px;
    letter-spacing: 0;
  }

  .about-return {
    font-size: 11px;
  }

  .about-intro {
    padding: 32px 0;
  }

  .about-intro p {
    font-size: 13px;
  }

  .about-mode-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .about-card {
    padding: 21px;
  }

  .about-section {
    margin-bottom: 26px;
  }

  .about-footer {
    align-items: flex-start;
    margin-top: 28px;
  }
}

@media (max-width: 400px) {
  .about-brand .brand-name {
    font-size: 16px;
  }

  .about-return span {
    display: none;
  }

  .about-card {
    padding: 18px;
  }
}