:root{
  --accent:#2563eb;
  --accent-soft:#3b82f6;
  --accent-dim:rgba(37,99,235,.22);
  --accent-bg-active:#1b2a42;
  --gradient:linear-gradient(90deg,#2563eb,#60a5fa);
}

body[data-theme="outlet"]{
  --accent:#16a34a;
  --accent-soft:#22c55e;
  --accent-dim:rgba(34,197,94,.22);
  --accent-bg-active:#173122;
  --gradient:linear-gradient(90deg,#16a34a,#4ade80);
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:Inter,Arial,sans-serif;
}

html,body{
  width:100%;
  height:100%;
  overflow:hidden;
  background:#0b0f14;
  color:white;
}

.container{
  display:flex;
  width:100%;
  height:100vh;
  overflow:hidden;
}

.player-area{
  flex:1;
  padding:20px;
  display:grid;
  grid-template-rows:auto minmax(0,1fr) auto;
  gap:16px;
  overflow:hidden;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:18px;
  flex-wrap:wrap;
}

.topbar-left{display:flex; align-items:center; gap:14px;}

.back-link{
  color:#9ca3af;
  font-size:13px;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:4px;
  margin-bottom:6px;
}
.back-link:hover{color:white;}

.main-title{
  font-size:26px;
  font-weight:900;
}

.subtitle{
  margin-top:6px;
  color:#9ca3af;
  font-size:14px;
}

.topbar-actions{display:flex; gap:10px; align-items:center; flex-wrap:wrap;}

.pill-btn{
  background:#141b24;
  border:1px solid rgba(255,255,255,.08);
  color:white;
  font-size:13px;
  font-weight:700;
  padding:10px 16px;
  border-radius:999px;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:8px;
  transition:.2s;
  white-space:nowrap;
}
.pill-btn:hover{border-color:var(--accent); transform:translateY(-1px);}
.pill-btn.solid{background:var(--accent); border-color:var(--accent);}
.pill-btn.solid:hover{background:var(--accent-soft);}

.progress-box{
  background:#141b24;
  padding:14px;
  border-radius:16px;
  min-width:230px;
}

.progress-top{
  display:flex;
  justify-content:space-between;
  margin-bottom:10px;
  font-size:14px;
}

.progress-bar{
  height:9px;
  background:#253040;
  border-radius:999px;
  overflow:hidden;
}

.progress-fill{
  height:100%;
  width:0%;
  background:var(--gradient);
  transition:.3s;
}

.video-wrapper{
  width:100%;
  height:100%;
  background:black;
  border-radius:22px;
  overflow:hidden;
  box-shadow:0 20px 70px rgba(0,0,0,.45);
}

.video-wrapper iframe{
  width:100%;
  height:100%;
  border:none;
}

.video-info{
  background:#141b24;
  padding:20px;
  border-radius:20px;
}

.tag{
  display:inline-block;
  background:var(--accent);
  padding:6px 13px;
  border-radius:999px;
  font-size:11px;
  font-weight:700;
  margin-bottom:10px;
  letter-spacing:.5px;
}

.video-info h2{
  font-size:26px;
  margin-bottom:10px;
  line-height:1.2;
}

.video-info p{
  color:#b7c0ce;
  line-height:1.6;
  font-size:15px;
}

.sidebar{
  width:440px;
  height:100vh;
  background:#11161d;
  border-left:1px solid rgba(255,255,255,.05);
  display:flex;
  flex-direction:column;
  overflow:hidden;
  flex-shrink:0;
}

.sidebar-header{
  padding:16px 20px;
  border-bottom:1px solid rgba(255,255,255,.05);
  flex-shrink:0;
}

.sidebar-header h2{
  font-size:21px;
  margin-bottom:6px;
}

.sidebar-header p{
  color:#9ca3af;
  font-size:13px;
}

.sidebar-tabs{
  display:flex;
  gap:8px;
  padding:12px 14px 0;
  flex-shrink:0;
}

.sidebar-tab{
  flex:1;
  background:#151b24;
  border:1px solid transparent;
  color:#9ca3af;
  font-weight:800;
  font-size:13px;
  padding:10px;
  border-radius:12px;
  cursor:pointer;
  transition:.2s;
}

.sidebar-tab.active{
  background:var(--accent-dim);
  border-color:var(--accent);
  color:white;
}

.tutor-box{
  margin:14px;
  padding:16px;
  background:#151b24;
  border:1px solid var(--accent-dim);
  border-radius:18px;
  flex-shrink:0;
}

.tutor-title{
  font-weight:900;
  font-size:16px;
  margin-bottom:6px;
}

.tutor-box p{
  color:#9ca3af;
  font-size:13px;
  line-height:1.45;
  margin-bottom:12px;
}

.tutor-box textarea{
  width:100%;
  min-height:66px;
  resize:none;
  border:none;
  outline:none;
  border-radius:14px;
  padding:12px;
  background:#0d121a;
  color:white;
  font-size:14px;
  line-height:1.4;
  margin-bottom:10px;
}

.tutor-box button,
.tutor-action{
  width:100%;
  border:none;
  background:var(--accent);
  color:white;
  font-weight:800;
  padding:12px 14px;
  border-radius:14px;
  cursor:pointer;
  transition:.25s;
}

.tutor-box button:hover,
.tutor-action:hover{
  background:var(--accent-soft);
  transform:translateY(-1px);
}

.tutor-answer{
  display:none;
  margin-top:12px;
  padding:13px;
  border-radius:14px;
  background:#0d121a;
  border:1px solid rgba(255,255,255,.07);
}

.tutor-answer.show{display:block;}

.tutor-answer strong{
  display:block;
  margin-bottom:6px;
  color:var(--accent-soft);
}

.tutor-answer p{
  margin-bottom:10px;
  color:#cbd5e1;
  font-size:13px;
}

.tutor-answer .recommendation{
  font-size:13px;
  color:#e5e7eb;
  margin-bottom:10px;
}

.list-panel{
  padding:10px 14px 14px;
  overflow-y:auto;
  height:100%;
  display:none;
}
.list-panel.active{display:block;}

.lesson{
  display:flex;
  gap:14px;
  padding:11px;
  background:#151b24;
  border-radius:17px;
  margin-bottom:11px;
  cursor:pointer;
  transition:.25s;
  position:relative;
  border:1px solid transparent;
}

.lesson:hover{
  transform:translateX(5px);
  border-color:var(--accent);
}

.lesson.active{
  background:var(--accent-bg-active);
  border-color:var(--accent);
}

.lesson.completed::after{
  content:'✓';
  position:absolute;
  top:9px;
  right:9px;
  width:25px;
  height:25px;
  border-radius:50%;
  background:#10b981;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:bold;
  font-size:13px;
}

.lesson.locked{
  opacity:.55;
  cursor:not-allowed;
}

.thumb{
  width:118px;
  height:67px;
  min-width:118px;
  border-radius:12px;
  overflow:hidden;
  position:relative;
  background:#000;
}

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

.play{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(0,0,0,.3);
  font-size:20px;
}

.lesson-text{padding-right:22px; min-width:0;}

.lesson-text small{
  color:var(--accent-soft);
  font-size:11px;
  font-weight:800;
  letter-spacing:1px;
}

.lesson-text h3{
  font-size:14px;
  line-height:1.35;
  margin:6px 0;
}

.lesson-text span{
  color:#8b95a7;
  font-size:12px;
  line-height:1.4;
  display:block;
  overflow:hidden;
  text-overflow:ellipsis;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
}

/* Modal */
.modal-overlay{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.65);
  backdrop-filter:blur(3px);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:100;
  padding:20px;
}
.modal-overlay.show{display:flex;}

.modal-card{
  background:#151b24;
  border:1px solid rgba(255,255,255,.08);
  border-radius:26px;
  padding:40px;
  max-width:640px;
  width:100%;
  text-align:center;
}

.modal-card h2{
  font-size:34px;
  font-weight:900;
  margin-bottom:14px;
}

.modal-card > p{
  color:#b7c0ce;
  font-size:15px;
  margin-bottom:26px;
  line-height:1.5;
}

.modal-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  margin-bottom:26px;
}

.modal-grid a{
  display:flex;
  align-items:center;
  justify-content:center;
  background:#0d121a;
  border:1px solid rgba(255,255,255,.08);
  color:white;
  text-decoration:none;
  font-weight:800;
  font-size:15px;
  padding:22px 16px;
  border-radius:16px;
  transition:.2s;
}
.modal-grid a:hover{
  border-color:var(--accent);
  background:var(--accent-dim);
  transform:translateY(-2px);
}

.modal-close{
  border:none;
  background:#dc2626;
  color:white;
  font-weight:800;
  font-size:15px;
  padding:14px 40px;
  border-radius:14px;
  cursor:pointer;
  transition:.2s;
}
.modal-close:hover{background:#ef4444;}

@media(max-width:980px){
  html,body{overflow:auto; height:auto;}
  .container{flex-direction:column; height:auto;}
  .player-area{display:flex; flex-direction:column; padding:16px;}
  .sidebar{width:100%; height:auto; border-left:none; border-top:1px solid rgba(255,255,255,.05);}
  .list-panel{overflow:visible;}
  .video-info h2{font-size:22px;}
  .modal-grid{grid-template-columns:1fr;}
  .video-wrapper{aspect-ratio:16/9; height:auto;}
}