body.course-detail-page{
  background:#050605;
  color:#eef1ee;
}

.course-main{
  min-height:100vh;
  padding:150px 0 100px;
  background:
    radial-gradient(circle at 70% 12%,rgba(122,154,91,.08),transparent 28%),
    #050605;
}

.course-container{
  width:min(100% - 30px,1120px);
  margin:0 auto;
}

.course-hero{
  padding:18px 0 54px;
}

.course-back{
  display:inline-block;
  margin-bottom:28px;
  color:#747c76;
  font-size:10px;
  text-decoration:none;
}

.course-kicker{
  margin:0 0 9px;
  color:#8fb36a;
  font-size:9px;
  letter-spacing:.18em;
}

.course-hero h1{
  max-width:900px;
  margin:0;
  color:#e8ece8;
  font-size:clamp(32px,6vw,56px);
  font-weight:300;
  line-height:1.12;
}

.course-summary{
  max-width:760px;
  margin:18px 0 0;
  color:#7d857f;
  font-size:12px;
  line-height:1.8;
}

.course-section{
  padding:38px 0 54px;
  border-top:1px solid #1c211d;
}

.course-section-head{
  margin-bottom:24px;
}

.course-section-head span{
  display:block;
  margin-bottom:5px;
  color:#8fb36a;
  font-size:9px;
  letter-spacing:.17em;
}

.course-section-head h2{
  margin:0;
  color:#ddd;
  font-size:clamp(22px,4vw,30px);
  font-weight:300;
}

.lesson-list{
  display:grid;
  gap:1px;
  background:#1b201c;
  border:1px solid #1b201c;
}

.lesson-card{
  display:grid;
  grid-template-columns:54px 1fr;
  gap:0;
  background:#080a08;
}

.lesson-no{
  padding:22px 14px;
  border-right:1px solid #1c211d;
  color:#555d57;
  font-size:10px;
}

.lesson-content{
  padding:22px;
}

.lesson-meta{
  margin-bottom:7px;
  color:#baa274;
  font-size:8px;
  letter-spacing:.12em;
}

.lesson-content h3{
  margin:0;
  color:#e5e8e5;
  font-size:17px;
  font-weight:400;
}

.lesson-content > p{
  margin:8px 0 0;
  color:#777f79;
  font-size:10px;
  line-height:1.65;
}

.lesson-body{
  margin-top:18px;
  padding-top:16px;
  border-top:1px solid #161b17;
  color:#929a94;
  font-size:11px;
  line-height:1.8;
}

.lesson-body h2,
.lesson-body h3{
  color:#c8cec9;
  font-size:13px;
}

.lesson-body ul{
  margin:8px 0 0 18px;
  padding:0;
}

.video-placeholder,
.lab-placeholder{
  display:flex;
  align-items:center;
  gap:18px;
  min-height:130px;
  padding:24px;
  border:1px solid #202620;
  background:#080a08;
}

.video-placeholder-icon{
  display:grid;
  width:58px;
  height:58px;
  flex:0 0 auto;
  place-items:center;
  border:1px solid #394239;
  border-radius:50%;
  color:#baa274;
}

.video-placeholder strong,
.lab-placeholder strong{
  display:block;
  color:#dfe3df;
  font-size:13px;
  font-weight:400;
}

.video-placeholder p,
.lab-placeholder p{
  margin:7px 0 0;
  color:#737b75;
  font-size:10px;
  line-height:1.6;
}

.video-placeholder span{
  display:block;
  margin-top:7px;
  color:#59615b;
  font-size:9px;
}

.course-empty{
  padding:24px;
  border:1px solid #202620;
  background:#080a08;
  color:#747c76;
  font-size:11px;
}

@media(min-width:760px){
  .lesson-card{
    grid-template-columns:72px 1fr;
  }
  .lesson-content{
    padding:26px 30px;
  }
}


/* Phase 35: published course video + live IoT Lab link */
.course-video-player{
  padding:18px;
  border:1px solid #202620;
  background:#080a08;
}
.course-video-player video{
  display:block;
  width:100%;
  max-height:560px;
  border:1px solid #2a322b;
  background:#000;
}
.course-video-player strong{
  display:block;
  margin-top:12px;
  color:#dfe3df;
  font-size:13px;
  font-weight:400;
}
.video-open-link,
.lab-open-link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  margin-top:12px;
  padding:0 14px;
  border:1px solid #394239;
  color:#b9cf9f;
  text-decoration:none;
}
.video-open-link:hover,
.lab-open-link:hover{
  border-color:#6f875e;
  color:#e0efd0;
}

/* Embedded YouTube video in the dedicated VIDEO section */
.course-youtube-player{
  width:100%;
}
.course-youtube-frame{
  position:relative;
  width:min(100%, 880px) !important;
  aspect-ratio:16 / 9;
  margin:0 auto;
  background:#000;
  overflow:hidden;
  border:1px solid #2a322b;
  border-radius:10px;
}
.course-youtube-frame iframe{
  position:absolute !important;
  inset:0 !important;
  width:100% !important;
  height:100% !important;
  min-width:100% !important;
  min-height:100% !important;
  border:0 !important;
  display:block !important;
}
.course-youtube-player > strong{
  width:min(100%, 880px);
  margin:12px auto 0;
}

@media(max-width:760px){
  .course-video-player{padding:10px;}
  .course-youtube-frame,
  .course-youtube-player > strong{width:100% !important;}
  .course-youtube-frame{border-radius:6px;}
}