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

html {
  scroll-behavior: smooth;
}

body {
  background: radial-gradient(circle at 50% 15%, #fff3e0 0%, #ffe0ec 45%, #dff2ff 100%);
  background-attachment: fixed;
  color: #2b1f3d;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

.about-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  max-width: 960px;
  margin: 0 auto;
}

.about-wordmark {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 18px;
}

.about-logo {
  width: 28px;
  height: 28px;
}

.about-nav-link {
  color: #2b1f3d;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 111, 145, 0.14);
}

.about-nav-link:hover {
  background: rgba(255, 111, 145, 0.24);
}

.about-hero {
  max-width: 720px;
  margin: 24px auto 40px;
  padding: 0 24px;
  text-align: center;
}

.about-hero h1 {
  font-size: 36px;
  margin-bottom: 16px;
}

.about-hero p {
  font-size: 18px;
  line-height: 1.6;
  opacity: 0.85;
}

.about-layout {
  display: flex;
  align-items: flex-start;
  gap: 48px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.about-toc {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 190px;
  flex-shrink: 0;
}

.about-toc-link {
  color: #2b1f3d;
  opacity: 0.6;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 10px;
  border-left: 3px solid transparent;
  transition: opacity 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.about-toc-link:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.5);
}

.about-toc-link.is-active {
  opacity: 1;
  border-left-color: #ff6f91;
  background: rgba(255, 255, 255, 0.6);
}

.about-content {
  flex: 1;
  min-width: 0;
  line-height: 1.6;
}

.about-section {
  margin-bottom: 56px;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.about-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.about-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.about-section p {
  margin-bottom: 12px;
  opacity: 0.9;
}

.about-content a {
  color: #d1447a;
  font-weight: 600;
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.about-card {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 111, 145, 0.18);
  border-radius: 16px;
  padding: 20px;
}

.about-card-icon {
  font-size: 28px;
  display: block;
  margin-bottom: 8px;
}

.about-card h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.about-card p {
  font-size: 14px;
  margin-bottom: 0;
}

.about-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.about-steps li {
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 14px;
  padding: 14px 18px;
}

.about-step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(90deg, #ff6f91, #ffb26b);
  color: #fff;
  font-weight: 800;
  font-size: 14px;
}

.about-faq {
  background: rgba(255, 255, 255, 0.6);
  border-radius: 14px;
  padding: 14px 18px;
  margin-bottom: 10px;
}

.about-faq summary {
  cursor: pointer;
  font-weight: 700;
}

.about-faq p {
  margin: 10px 0 0;
  opacity: 0.85;
}

.about-footer {
  text-align: center;
  padding: 24px;
  font-size: 13px;
  opacity: 0.6;
}

@media (max-width: 720px) {
  .about-layout {
    flex-direction: column;
  }

  .about-toc {
    position: static;
    flex-direction: row;
    overflow-x: auto;
    width: 100%;
    padding-bottom: 8px;
  }

  .about-toc-link {
    white-space: nowrap;
    border-left: none;
    border-bottom: 3px solid transparent;
  }

  .about-toc-link.is-active {
    border-left-color: transparent;
    border-bottom-color: #ff6f91;
  }

  .about-cards {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .about-section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}