/* =====================================================
   講座詳細ページ（CPT: course 個別ページ）
   読込条件: is_singular('course')
===================================================== */

/* -----------------------------------------------------
   LAYOUT
----------------------------------------------------- */
.course-detail-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: flex-start;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
}

.course-detail-main {
  min-width: 0;
}

.course-detail-side {
  position: sticky;
  top: 96px;
}

/* -----------------------------------------------------
   VIDEO PREVIEW
----------------------------------------------------- */
.course-video {
  position: relative;
  margin-bottom: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #e5e5e5;
  border: 1px solid var(--color-border);
}

.course-video img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-video-link {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
}

.course-video-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--color-text-muted);
  font-size: 13px;
}

.play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  background: rgba(0, 0, 0, 0.55);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.course-video-link:hover .play-icon {
  background: rgba(0, 0, 0, 0.8);
}

.play-icon::after {
  content: '';
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  border-left: 18px solid #fff;
  margin-left: 6px;
}

/* -----------------------------------------------------
   TAGS / TITLE / META
----------------------------------------------------- */
.course-tags {
  margin-bottom: 14px;
}

.course-tags .lesson-tag {
  padding: 4px 12px;
  font-size: 12px;
  border: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text-sub);
  border-radius: 999px;
}

.course-tags .lesson-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  opacity: 1;
}

.course-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.5;
  margin: 4px 0 8px;
  color: var(--color-text-main);
}

.course-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.course-summary {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-main);
  background: var(--color-primary-light, #E6F3F5);
  padding: 16px 20px;
  border-radius: 8px;
  margin-bottom: 32px;
}

/* 本文先頭のキャッチコピー（H1直下相当） */
.course-content > .course-catch:first-child {
  font-size: 17px;
  line-height: 1.85;
  color: var(--color-text-main);
  background: var(--color-primary-light, #E6F3F5);
  padding: 18px 22px;
  border-radius: 8px;
  margin: 0 0 32px;
  font-weight: 500;
}

/* -----------------------------------------------------
   PRIMARY CTA (LearningBoxへ送客)
----------------------------------------------------- */
.course-primary-cta {
  margin: 24px 0 40px;
}

.course-primary-cta--bottom {
  margin: 32px 0;
  text-align: center;
}

.course-primary-cta--bottom small {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.btn-cta-main {
  flex-direction: column;
  gap: 4px;
  padding: 20px 32px;
  min-height: 72px;
  box-shadow: 0 6px 16px rgba(26, 144, 167, 0.25);
}

.btn-cta-main:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 144, 167, 0.35);
  opacity: 1;
}

.btn-cta-main-text {
  font-size: 17px;
  font-weight: 700;
}

.btn-cta-main-note {
  font-size: 11px;
  font-weight: 400;
  opacity: 0.85;
}

.btn.is-disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* -----------------------------------------------------
   SECTION TITLE
----------------------------------------------------- */
.course-section-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.4;
}

.course-content {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text-sub);
  margin-bottom: 48px;
}

.course-content p {
  margin-bottom: 16px;
}

.course-content h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.4;
  color: var(--color-text-main);
}

.course-content h2:first-child,
.course-content > .course-catch:first-child + h2 {
  margin-top: 0;
}

.course-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-text-main);
  line-height: 1.5;
}

.course-content ul,
.course-content ol {
  margin: 0 0 20px;
  padding-left: 1.5em;
  list-style-position: outside;
}

.course-content ul {
  list-style-type: disc;
}

.course-content ol {
  list-style-type: decimal;
}

.course-content li {
  margin-bottom: 8px;
  line-height: 1.85;
}

.course-content li::marker {
  color: var(--color-primary);
}

.course-content strong {
  font-weight: 700;
  color: var(--color-text-main);
}

/* カリキュラム「歩み」など、第N回が項目になるリスト用 */
.course-content ul.curriculum-list {
  list-style: none;
  padding-left: 0;
}

.course-content ul.curriculum-list > li {
  padding: 12px 16px;
  background: #FAFAF7;
  border-radius: 6px;
  margin-bottom: 10px;
}

/* -----------------------------------------------------
   INSTRUCTOR BOX
----------------------------------------------------- */
.instructor-box {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 48px;
  background: #fff;
}

.instructor-box-label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.instructor-box-inner {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.instructor-avatar {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  background: var(--color-primary-light);
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 11px;
}

.instructor-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.instructor-info {
  flex: 1;
  min-width: 0;
}

.instructor-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-text-main);
}

.instructor-title {
  font-size: 12px;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.instructor-bio {
  font-size: 13px;
  color: var(--color-text-sub);
  line-height: 1.7;
  margin-bottom: 10px;
}

.instructor-link {
  display: inline-block;
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.instructor-link:hover {
  opacity: 0.7;
}

/* -----------------------------------------------------
   OTHER COURSES CTA
----------------------------------------------------- */
.other-courses-cta {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

/* -----------------------------------------------------
   SIDE CTA CARD
----------------------------------------------------- */
.course-detail-side .cta-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.cta-card-thumb {
  aspect-ratio: 16 / 9;
  background: #e5e5e5;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 12px;
  overflow: hidden;
}

.cta-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-card-body {
  padding: 20px;
}

.cta-card-label {
  font-size: 11px;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.cta-card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text-main);
  line-height: 1.5;
}

.cta-card-sub {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.6;
}

.course-detail-side .cta-card .btn {
  margin-bottom: 8px;
}

.cta-card-checklist {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.cta-card-checklist li {
  font-size: 12px;
  color: var(--color-text-sub);
  padding: 4px 0 4px 20px;
  position: relative;
}

.cta-card-checklist li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* =====================================================
   TABLET (≤ 1024px)
===================================================== */
@media (max-width: 1024px) {
  .course-detail-grid {
    grid-template-columns: 1fr 280px;
    gap: 32px;
  }

  .course-title {
    font-size: 24px;
  }
}

/* =====================================================
   SP (≤ 768px)
===================================================== */
@media (max-width: 768px) {
  .course-detail-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .course-detail-side {
    position: static;
  }

  .course-title {
    font-size: 20px;
  }

  .course-section-title {
    font-size: 17px;
  }

  .course-meta {
    margin-bottom: 24px;
  }

  .course-content {
    font-size: 14px;
    margin-bottom: 32px;
  }

  .instructor-box {
    padding: 20px;
    margin-bottom: 32px;
  }

  .instructor-box-inner {
    gap: 14px;
  }

  .instructor-avatar {
    width: 52px;
    height: 52px;
  }

  .instructor-name {
    font-size: 16px;
  }

  .other-courses-cta {
    padding: 32px 0;
  }

  .play-icon {
    width: 56px;
    height: 56px;
  }

  .play-icon::after {
    border-top-width: 9px;
    border-bottom-width: 9px;
    border-left-width: 14px;
  }
}

/* =====================================================
   SMALL SP (≤ 375px)
===================================================== */
@media (max-width: 375px) {
  .course-title {
    font-size: 18px;
  }

  .instructor-box-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}