.behavior-page {
  background:
    radial-gradient(circle at top left, rgba(47, 94, 245, 0.08), transparent 28%),
    linear-gradient(180deg, #f7faff 0%, #ffffff 240px);
}

.behavior-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.behavior-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.behavior-header-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.behavior-header-links a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 14px;
}

.behavior-header-links a:hover {
  color: var(--primary);
}

.behavior-hero {
  padding: 64px 0 32px;
}

.behavior-hero-card {
  padding: 40px;
  border: 1px solid rgba(47, 94, 245, 0.08);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 24px 60px rgba(19, 36, 84, 0.08);
}

.behavior-eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(47, 94, 245, 0.08);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
}

.behavior-title {
  margin-top: 18px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.behavior-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
  color: var(--text-light);
  font-size: 15px;
}

.behavior-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #f5f7fb;
}

.behavior-summary {
  margin-top: 24px;
  color: var(--text-light);
  font-size: 16px;
  line-height: 1.9;
}

.behavior-summary + .behavior-summary {
  margin-top: 12px;
}

.behavior-toc-card {
  margin-top: 24px;
  padding: 24px 28px;
  border-radius: 20px;
  background: #f7f9fd;
  border: 1px solid #e8edf7;
}

.behavior-toc-card h2 {
  margin-bottom: 16px;
  font-size: 18px;
}

.behavior-toc-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 20px;
  list-style: none;
}

.behavior-toc-list a {
  display: inline-flex;
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.6;
}

.behavior-toc-list a:hover {
  color: var(--primary);
}

.behavior-content {
  padding: 0 0 80px;
}

.behavior-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.behavior-aside {
  position: sticky;
  top: 92px;
}

.behavior-aside-card {
  padding: 20px;
  border: 1px solid #e6ebf4;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 12px 30px rgba(24, 35, 69, 0.06);
}

.behavior-aside-card h2 {
  margin-bottom: 12px;
  font-size: 16px;
}

.behavior-aside-list {
  list-style: none;
}

.behavior-aside-list li + li {
  margin-top: 8px;
}

.behavior-aside-list a {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text-light);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
}

.behavior-aside-list a:hover {
  background: rgba(47, 94, 245, 0.06);
  color: var(--primary);
}

.behavior-article {
  padding: 36px 40px 48px;
  border: 1px solid #e6ebf4;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 18px 40px rgba(24, 35, 69, 0.07);
}

.behavior-article a {
  color: var(--primary);
}

.behavior-article section + section {
  margin-top: 40px;
}

.behavior-article h2 {
  margin-bottom: 18px;
  font-size: 30px;
  line-height: 1.3;
}

.behavior-article h3 {
  margin: 24px 0 12px;
  font-size: 21px;
  line-height: 1.4;
}

.behavior-article h4 {
  margin: 18px 0 10px;
  font-size: 17px;
  line-height: 1.5;
}

.behavior-article p {
  margin: 0;
  color: #404755;
  font-size: 16px;
  line-height: 1.9;
}

.behavior-article p + p {
  margin-top: 14px;
}

.behavior-article ol,
.behavior-article ul {
  margin: 14px 0 0 1.4em;
  color: #404755;
}

.behavior-article li {
  line-height: 1.9;
}

.behavior-article li + li {
  margin-top: 8px;
}

.behavior-article ol ol,
.behavior-article ol ul,
.behavior-article ul ol,
.behavior-article ul ul {
  margin-top: 10px;
}

.behavior-note {
  margin-top: 20px;
  padding: 18px 20px;
  border-left: 4px solid var(--primary);
  border-radius: 16px;
  background: #f4f7ff;
}

.behavior-footer {
  border-top: 1px solid var(--line);
  background: #111827;
  color: #b8c0d0;
}

.behavior-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 0;
}

.behavior-footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.behavior-footer a {
  color: #d7dceb;
  text-decoration: none;
}

.behavior-footer a:hover {
  color: #ffffff;
}

@media (max-width: 980px) {
  .behavior-toc-list {
    grid-template-columns: 1fr;
  }

  .behavior-layout {
    grid-template-columns: 1fr;
  }

  .behavior-aside {
    position: static;
  }
}

@media (max-width: 640px) {
  .behavior-hero {
    padding-top: 40px;
  }

  .behavior-hero-card,
  .behavior-article {
    padding: 24px 20px;
    border-radius: 18px;
  }

  .behavior-header-inner,
  .behavior-footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .behavior-title {
    font-size: 30px;
  }

  .behavior-article h2 {
    font-size: 24px;
  }

  .behavior-article h3 {
    font-size: 19px;
  }
}