/* 课程页 · 相关知识 / 案例 / 研究（GEO 证据链，访客向） */
.course-related {
  --cr-accent: #ff8900;
  --cr-text: #1a1a2e;
  --cr-muted: #5b6472;
  --cr-line: rgba(26, 26, 46, 0.1);
  --cr-bg: #f7f5f1;
  padding: clamp(48px, 6vw, 72px) 24px;
  background: var(--cr-bg);
  color: var(--cr-text);
}
.course-related__inner {
  max-width: 1080px;
  margin: 0 auto;
}
.course-related__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cr-accent);
  font-weight: 600;
  margin-bottom: 10px;
}
.course-related__eyebrow::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cr-accent);
}
.course-related__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  font-weight: 700;
}
.course-related__lead {
  margin: 0 0 28px;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cr-muted);
}
.course-related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.course-related__col {
  border-top: 2px solid var(--cr-accent);
  padding-top: 16px;
}
.course-related__col h3 {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.course-related__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.course-related__col a {
  display: block;
  text-decoration: none;
  color: var(--cr-text);
  font-size: 14px;
  line-height: 1.55;
  padding: 10px 0;
  border-bottom: 1px solid var(--cr-line);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.course-related__col a:hover {
  color: var(--cr-accent);
  padding-left: 6px;
}
.course-related__col a span {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: var(--cr-muted);
  font-weight: 400;
}
.course-related__more {
  margin-top: 18px;
  font-size: 13px;
}
.course-related__more a {
  color: var(--cr-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  border: 0;
  padding: 0;
}
.course-related__more a:hover { padding-left: 0; }

/* 课程页：结构化案例 SSR（无 JS 可读） */
.course-structured-cases {
  width: min(1100px, calc(100% - 40px));
  margin: 28px auto 8px;
  padding: 20px 22px;
  border: 1px solid rgba(20, 24, 28, 0.1);
  background: #fff;
}
.course-structured-cases__label {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: #66707a;
  font-weight: 600;
}
.course-structured-cases__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.course-structured-cases__list a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: #9a3412;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.45;
}
.course-structured-cases__list a span {
  font-size: 12px;
  font-weight: 400;
  color: #66707a;
}
.course-structured-cases__list a:hover { text-decoration: underline; }
.course-structured-cases__more {
  margin: 14px 0 0;
  font-size: 13px;
}
.course-structured-cases__more a { color: #c2410c; }
.course-structured-cases__empty {
  margin: 0;
  font-size: 14px;
  color: #66707a;
  line-height: 1.6;
}
.course-structured-cases__empty a { color: #c2410c; }

/* 课程页 · 独立「相关演讲知识」（Course → Knowledge 主模块） */
.course-knowledge {
  --ck-accent: #ff8900;
  --ck-text: #1a1a2e;
  --ck-muted: #5b6472;
  --ck-line: rgba(26, 26, 46, 0.1);
  --ck-bg: #fffaf4;
  padding: clamp(36px, 5vw, 56px) 24px;
  background: var(--ck-bg);
  color: var(--ck-text);
  border-top: 1px solid rgba(255, 137, 0, 0.18);
  border-bottom: 1px solid rgba(255, 137, 0, 0.12);
}
.course-knowledge__inner {
  max-width: 720px;
  margin: 0 auto;
}
.course-knowledge__eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ck-accent);
  font-weight: 700;
}
.course-knowledge__heading {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  font-weight: 800;
}
.course-knowledge__lead {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ck-muted);
}
.course-knowledge__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.course-knowledge__list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ck-line);
  color: var(--ck-text);
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
}
.course-knowledge__list a:hover {
  color: var(--ck-accent);
}
.course-knowledge__note {
  font-size: 12px;
  font-weight: 500;
  color: var(--ck-muted);
}
.course-knowledge__more {
  margin: 18px 0 0;
  font-size: 14px;
}
.course-knowledge__more a {
  color: #c2410c;
  font-weight: 600;
}
.course-knowledge--dark {
  --ck-text: #f3f4f6;
  --ck-muted: rgba(243, 244, 246, 0.65);
  --ck-line: rgba(255, 255, 255, 0.12);
  --ck-bg: #121a28;
}
.course-knowledge--dark .course-knowledge__more a {
  color: #ffb35c;
}

/* 深色课程页适配：父级加 data-theme="dark" 或 .course-related--dark */
.course-related--dark {
  --cr-text: #f3f4f6;
  --cr-muted: rgba(243, 244, 246, 0.65);
  --cr-line: rgba(255, 255, 255, 0.12);
  --cr-bg: #0f1724;
}

@media (max-width: 860px) {
  .course-related__grid { grid-template-columns: 1fr; gap: 28px; }
}