:root{
  --bg0:#070A12;
  --bg1:#0B1020;
  --card:rgba(255,255,255,.06);
  --cardStrong:rgba(255,255,255,.09);
  --text:#E9ECF5;
  --muted:#A8B0C4;
  --brand:#7C5CFF;
  --brand2:#22D3EE;
  --danger:#FF4D6D;
  --shadow: 0 18px 40px rgba(0,0,0,.35);
  --ring: 0 0 0 1px rgba(255,255,255,.10);
  --ring2: 0 0 0 1px rgba(255,255,255,.14);
  --radius: 18px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:
    radial-gradient(900px 600px at 12% 10%, rgba(124,92,255,.24), transparent 60%),
    radial-gradient(900px 600px at 85% 15%, rgba(34,211,238,.14), transparent 55%),
    radial-gradient(900px 700px at 50% 95%, rgba(255,77,109,.10), transparent 62%),
    linear-gradient(180deg, #070A12, #0B1020);
}

a{ color:inherit; text-decoration:none; }
.wrap{ max-width:1100px; margin:0 auto; padding:28px 18px 46px; }
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px; padding:10px 12px; border-radius:999px;
  background: rgba(255,255,255,.04);
  box-shadow: var(--ring);
  backdrop-filter: blur(10px);
}
.brand{ display:flex; align-items:center; gap:10px; font-weight:700; letter-spacing:.2px; }
.dot{
  width:10px; height:10px; border-radius:50%;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  box-shadow: 0 0 0 4px rgba(124,92,255,.10);
}
.pill{
  font-size:13px; color:var(--muted);
  padding:8px 10px; border-radius:999px;
  background: rgba(255,255,255,.03);
  box-shadow: var(--ring);
}
.pillBtn{
  border: 1px solid rgba(255,255,255,.10);
  cursor:pointer;
}
.pillBtn:hover{ background: rgba(255,255,255,.05); }
.pillBtn.active{
  color: #DDE3F7;
  background: rgba(124,92,255,.14);
  border-color: rgba(124,92,255,.30);
}

.hero{
  padding:34px 6px 12px;
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap:22px;
  align-items:start;
}
@media (max-width: 900px){ .hero{ grid-template-columns: 1fr; } }
.h1{ font-size:44px; line-height:1.05; margin:0 0 12px; letter-spacing:-.02em; }
.lead{ margin:0; color:var(--muted); font-size:16px; line-height:1.6; }

.card{
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow), var(--ring);
  padding:16px;
  backdrop-filter: blur(12px);
}
.card h2{ margin:0 0 8px; font-size:14px; color:var(--muted); font-weight:600; }
.row{ display:flex; gap:10px; align-items:center; }
.row > *{ flex:1; }
.input{
  width:100%;
  padding:12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(10,14,28,.55);
  color: var(--text);
  outline:none;
  transition: box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
.input:focus{ border-color: rgba(124,92,255,.55); box-shadow: 0 0 0 4px rgba(124,92,255,.18); }
.inputSm{ padding:10px 12px; border-radius: 12px; }
.btn{
  flex:0 0 auto;
  padding:12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.14);
  background: linear-gradient(135deg, rgba(124,92,255,.95), rgba(34,211,238,.75));
  color: #071019;
  font-weight: 800;
  cursor:pointer;
  box-shadow: 0 12px 24px rgba(124,92,255,.20);
  white-space:nowrap;
  transition: transform .12s ease, filter .12s ease, box-shadow .12s ease;
}
.btn:hover{ transform: translateY(-1px); filter: brightness(1.03); }
.btn:disabled{ opacity:.6; cursor:not-allowed; }
.btn:disabled:hover{ transform:none; filter:none; }
.sub{
  margin-top:10px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  color:var(--muted);
  font-size:13px;
}
.error{
  color: #FFD2DA;
  background: rgba(255,77,109,.12);
  border: 1px solid rgba(255,77,109,.25);
  padding:10px 12px;
  border-radius: 14px;
  margin-top:10px;
}
.ok{
  color:#CFFAFE;
  background: rgba(34,211,238,.10);
  border: 1px solid rgba(34,211,238,.22);
  padding:10px 12px;
  border-radius: 14px;
  margin-top:10px;
}
.muted{ color:var(--muted); }

.grid{ margin-top:16px; display:grid; grid-template-columns: repeat(3, 1fr); gap:12px; }
@media (max-width: 900px){ .grid{ grid-template-columns: 1fr; } }
.feat{ padding:14px; border-radius: var(--radius); background: rgba(255,255,255,.03); box-shadow: var(--ring); }
.feat .t{ font-weight:700; margin:0 0 6px; }
.feat .d{ margin:0; color:var(--muted); line-height:1.55; font-size:13px; }

/* Course */
.courseShell{ display:grid; grid-template-columns: 380px 1fr; gap:14px; margin-top: 18px; }
@media (max-width: 980px){ .courseShell{ grid-template-columns: 1fr; } }
.sidebar{ position: sticky; top: 16px; align-self: start; }
@media (max-width: 980px){ .sidebar{ position: static; } }
.courseTitle{ margin: 0 0 8px; font-size: 18px; letter-spacing: -0.01em; }
.progressWrap{
  display:flex; gap:10px; align-items:center; justify-content:space-between;
  padding:10px 12px; border-radius: 16px;
  background: rgba(255,255,255,.04); box-shadow: var(--ring);
}
.bar{ height: 10px; background: rgba(255,255,255,.08); border-radius: 999px; overflow:hidden; flex:1; }
.bar > div{ height:100%; width:0%; background: linear-gradient(90deg, var(--brand), var(--brand2)); }
.pct{ font-variant-numeric: tabular-nums; min-width: 54px; text-align:right; color: var(--muted); font-size: 13px; }
.sideTools{ margin-top: 12px; display:flex; flex-direction: column; gap: 10px; }
.sideMeta{ display:flex; align-items:center; justify-content:space-between; gap:10px; }
.sideMeta > span{ flex:1; min-width: 0; }
.list{
  margin-top: 10px;
  display:flex;
  flex-direction: column;
  gap: 8px;
  overflow:auto;
  padding-right: 2px;
  max-height: calc(100vh - 320px);
}
@media (max-width: 980px){ .list{ max-height: none; } }
.list::-webkit-scrollbar{ width: 10px; }
.list::-webkit-scrollbar-track{ background: transparent; }
.list::-webkit-scrollbar-thumb{
  background: rgba(255,255,255,.10);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.list::-webkit-scrollbar-thumb:hover{ background: rgba(255,255,255,.16); background-clip: padding-box; }
.item{
  display:grid; grid-template-columns: 72px 1fr auto; gap:10px; align-items:center;
  padding:10px; border-radius: 16px; background: rgba(255,255,255,.03);
  box-shadow: var(--ring); cursor:pointer;
  transition: transform .10s ease, background .10s ease, box-shadow .12s ease;
}
.item:hover{ background: rgba(255,255,255,.05); transform: translateY(-1px); }
.item:active{ transform: translateY(0px); }
.item.active{
  background: linear-gradient(135deg, rgba(124,92,255,.18), rgba(34,211,238,.10));
  box-shadow: var(--shadow), var(--ring2);
}
.thumb{ width:72px; height:44px; border-radius: 12px; background: rgba(255,255,255,.06); overflow:hidden; }
.thumb img{ width:100%; height:100%; object-fit:cover; display:block; }
.meta{ min-width:0; }
.meta .title{
  margin:0; font-size:13px; line-height:1.35; font-weight:700;
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
.meta .subt{ margin:2px 0 0; color:var(--muted); font-size:12px; }
.badge{ padding:6px 10px; border-radius:999px; font-size:12px; color:var(--muted); background: rgba(255,255,255,.04); box-shadow: var(--ring); }
.badge.done{ color:#CFFAFE; background: rgba(34,211,238,.10); border: 1px solid rgba(34,211,238,.18); }

.playerCard{ padding: 14px; }
.playerTop{ display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom: 10px; }
.playerTop h1{ margin:0; font-size:18px; letter-spacing:-.01em; }
.actions{ display:flex; gap:10px; align-items:center; }
@media (max-width: 520px){ .actions{ flex-wrap: wrap; justify-content:flex-end; } }
.ghost{
  padding:10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.03);
  color: var(--text);
  cursor:pointer;
  transition: transform .10s ease, background .10s ease, border-color .10s ease;
}
.ghost:hover{ background: rgba(255,255,255,.05); }
.ghost:disabled{ opacity:.55; cursor:not-allowed; }
.ghost:disabled:hover{ background: rgba(255,255,255,.03); transform:none; }
.videoShell{
  aspect-ratio: 16 / 9;
  width:100%;
  border-radius: 18px;
  overflow:hidden;
  background: rgba(0,0,0,.35);
  box-shadow: var(--shadow), var(--ring);
}
.videoShell iframe{ width:100%; height:100%; border:0; }

.footer{
  margin-top: 30px;
  color: rgba(255,255,255,.55);
  font-size: 12px;
  display:flex;
  justify-content:space-between;
  gap:10px;
  flex-wrap:wrap;
}

/* Better focus */
:is(button,a,input):focus-visible{
  outline: none;
  box-shadow: 0 0 0 4px rgba(124,92,255,.22);
}

@media (prefers-reduced-motion: reduce){
  *{ transition:none !important; scroll-behavior:auto !important; }
}

/* ---------------- Premium redesign (v3) ---------------- */
.bgGrid{
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 500px at 18% 8%, rgba(124,92,255,.16), transparent 65%),
    radial-gradient(800px 520px at 85% 18%, rgba(34,211,238,.10), transparent 62%),
    linear-gradient(to right, rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: auto, auto, 56px 56px, 56px 56px;
  opacity: .22;
  mask-image: radial-gradient(900px 500px at 50% 0%, black 20%, transparent 70%);
}

.container{ max-width: 1160px; margin: 0 auto; padding: 0 18px; }
.srOnly{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0;
}

.nav{
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(7,10,18,.55);
  border-bottom: 1px solid rgba(255,255,255,.07);
}
.navInner{
  height: 66px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 16px;
}
.logo{ display:flex; align-items:center; gap: 10px; font-weight: 900; letter-spacing: -.01em; }
.logoMark{
  width: 28px; height: 28px; border-radius: 10px;
  display:block;
  box-shadow: 0 14px 24px rgba(0,0,0,.28), var(--ring2);
}
.logoText{ font-size: 14px; }
.navRight{ display:flex; align-items:center; gap: 12px; }
.navLink{
  font-size: 13px;
  color: rgba(233,236,245,.72);
  padding: 10px 10px;
  border-radius: 999px;
}
.navLink:hover{ background: rgba(255,255,255,.04); color: rgba(233,236,245,.95); }
.navPill{
  font-size: 13px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
  color: rgba(233,236,245,.88);
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.navPill:hover{ background: rgba(255,255,255,.06); }

.hero2{
  padding: 34px 0 14px;
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 22px;
  align-items: start;
}
@media (max-width: 980px){ .hero2{ grid-template-columns: 1fr; } }
.kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  color: rgba(233,236,245,.72);
  font-size: 12px;
}
.titleXL{
  margin: 12px 0 10px;
  font-size: 54px;
  line-height: 1.02;
  letter-spacing: -.03em;
}
@media (max-width: 520px){ .titleXL{ font-size: 40px; } }
.gradText{
  background: linear-gradient(90deg, rgba(124,92,255,1), rgba(34,211,238,1));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead2{
  margin: 0;
  color: rgba(233,236,245,.72);
  font-size: 16px;
  line-height: 1.65;
  max-width: 58ch;
}
.heroStats{ margin-top: 16px; display:flex; gap: 10px; flex-wrap: wrap; }
.stat{
  flex: 1 1 160px;
  display:flex;
  gap: 10px;
  align-items:center;
  padding: 12px;
  border-radius: 18px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
}
.statNum{
  width: 34px; height: 34px; border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(124,92,255,.14);
  border: 1px solid rgba(124,92,255,.22);
  color: rgba(233,236,245,.92);
  font-weight: 900;
}
.statText{ font-weight: 700; font-size: 13px; color: rgba(233,236,245,.86); }

.panel{
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 22px;
  box-shadow: 0 26px 60px rgba(0,0,0,.38);
  padding: 16px;
}
.panelTop{ display:flex; align-items:flex-start; justify-content:space-between; gap: 12px; margin-bottom: 12px; }
.panelLabel{ font-size: 12px; color: rgba(233,236,245,.62); }
.panelTitle{ font-size: 16px; font-weight: 900; letter-spacing: -.01em; }
.chip{
  font-size: 12px;
  color: rgba(233,236,245,.72);
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(0,0,0,.14);
  white-space: nowrap;
}
.panelForm{ display:flex; gap: 10px; align-items:center; }
@media (max-width: 520px){ .panelForm{ flex-direction: column; align-items: stretch; } }
.inputLg{ padding: 14px 14px; border-radius: 16px; }
.btnPrimary{
  flex: 0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  padding: 14px 14px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.14);
  background: linear-gradient(135deg, rgba(124,92,255,.96), rgba(34,211,238,.82));
  color: #081018;
  font-weight: 950;
  cursor:pointer;
  box-shadow: 0 18px 32px rgba(124,92,255,.18);
  transition: transform .12s ease, filter .12s ease;
}
.btnPrimary:hover{ transform: translateY(-1px); filter: brightness(1.03); }
.btnPrimary:active{ transform: translateY(0px); }
.btnPrimary:disabled{ opacity: .65; cursor:not-allowed; }
.btnArrow{ opacity: .9; }
.panelHint{ margin-top: 12px; display:flex; align-items:center; justify-content:space-between; gap: 10px; }
.link{ color: rgba(34,211,238,.95); }
.link:hover{ text-decoration: underline; }

.alert{
  margin-top: 12px;
  padding: 12px 12px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: rgba(233,236,245,.86);
  box-shadow: 0 16px 34px rgba(0,0,0,.28);
}
.alertOk{
  border-color: rgba(34,211,238,.22);
  background: rgba(34,211,238,.10);
  color: rgba(207,250,254,.95);
}
.alertErr{
  border-color: rgba(255,77,109,.22);
  background: rgba(255,77,109,.10);
  color: rgba(255,210,218,.96);
}

.btnPrimary.loading{ opacity: .85; cursor: wait; }
.btnPrimary.loading .btnArrow{ opacity: .55; }

.miniCards{ margin-top: 12px; display:grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 520px){ .miniCards{ grid-template-columns: 1fr; } }
.miniCard{
  display:flex; gap: 10px; align-items:center;
  padding: 12px;
  border-radius: 18px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
}
.miniIcon{
  width: 34px; height: 34px; border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(34,211,238,.10);
  border: 1px solid rgba(34,211,238,.18);
  color: rgba(233,236,245,.90);
  font-weight: 900;
}
.miniTitle{ font-weight: 900; font-size: 13px; }
.miniDesc{ color: rgba(233,236,245,.68); font-size: 12px; margin-top: 2px; }

.section{ padding: 26px 0; }
.sectionHead{ display:flex; align-items:flex-end; justify-content:space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.titleL{ margin: 0; font-size: 22px; letter-spacing: -.01em; }
.titleM{ margin: 0; font-size: 18px; letter-spacing: -.01em; font-weight: 950; }

.featureGrid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 980px){ .featureGrid{ grid-template-columns: 1fr; } }
.featureCard{
  padding: 16px;
  border-radius: 22px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
}
.featureTop{ display:flex; align-items:center; gap: 12px; margin-bottom: 10px; }
.featureIcon{
  width: 38px; height: 38px; border-radius: 14px;
  display:grid; place-items:center;
  background: rgba(124,92,255,.12);
  border: 1px solid rgba(124,92,255,.18);
}
.featureTitle{ font-weight: 950; }
.featureDesc{ color: rgba(233,236,245,.68); line-height: 1.6; }

.steps{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 980px){ .steps{ grid-template-columns: 1fr; } }
.step{
  padding: 16px;
  border-radius: 22px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
  display:flex;
  gap: 12px;
  align-items:flex-start;
}
.stepNum{
  width: 34px; height: 34px; border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
  font-weight: 950;
}
.stepTitle{ font-weight: 950; }
.stepDesc{ margin-top: 6px; color: rgba(233,236,245,.68); line-height: 1.6; }

.siteFooter{
  padding: 24px 0 34px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,.08);
  margin-top: 18px;
}
.footerLinks{ display:flex; gap: 12px; }

/* Dashboard */
.appMain{ padding-top: 18px; padding-bottom: 32px; }
.appHeader{
  display:grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: start;
}
@media (max-width: 980px){ .appHeader{ grid-template-columns: 1fr; } }
.appTools{
  margin-top: 14px;
  display:flex;
  gap: 12px;
  align-items:center;
  justify-content:space-between;
  flex-wrap: wrap;
}
.appDataTools{ display:flex; gap: 10px; align-items:center; flex-wrap: wrap; }
.cardsHead{
  margin-top: 18px;
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap: 12px;
}
.courseCards{
  margin-top: 12px;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 1100px){ .courseCards{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 700px){ .courseCards{ grid-template-columns: 1fr; } }
.courseCard{
  padding: 16px;
  border-radius: 22px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
  box-shadow: 0 26px 60px rgba(0,0,0,.30);
}
.courseTop{ display:flex; align-items:flex-start; justify-content:space-between; gap: 12px; }
.courseTitle2{
  font-weight: 950;
  letter-spacing: -.01em;
  line-height: 1.25;
  max-width: 32ch;
}
.courseMeta{ margin-top: 10px; display:flex; align-items:center; justify-content:space-between; gap: 10px; }
.courseActions{ margin-top: 12px; display:flex; gap: 10px; flex-wrap: wrap; }

.emptyState{
  margin-top: 16px;
  padding: 28px;
  border-radius: 22px;
  border: 1px dashed rgba(255,255,255,.18);
  background: rgba(255,255,255,.02);
  text-align:center;
}
.emptyIcon{
  width: 46px; height: 46px;
  margin: 0 auto 10px;
  border-radius: 18px;
  display:grid; place-items:center;
  background: rgba(124,92,255,.12);
  border: 1px solid rgba(124,92,255,.18);
  font-weight: 950;
}
.emptyTitle{ font-weight: 950; }
.emptyDesc{ margin-top: 6px; color: rgba(233,236,245,.68); }

/* Toasts */
.toastHost{
  position: fixed;
  right: 16px;
  bottom: 16px;
  display:flex;
  flex-direction: column;
  gap: 10px;
  z-index: 50;
}
.toast{
  width: min(360px, calc(100vw - 32px));
  padding: 12px 12px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(7,10,18,.72);
  box-shadow: 0 26px 60px rgba(0,0,0,.42);
  transform: translateY(8px);
  opacity: 0;
  transition: transform .18s ease, opacity .18s ease;
  backdrop-filter: blur(12px);
}
.toast.in{ transform: translateY(0px); opacity: 1; }
.toastTitle{ font-weight: 950; margin-bottom: 2px; }
.toastMsg{ color: rgba(233,236,245,.72); font-size: 13px; line-height: 1.5; }
.toast.ok{ border-color: rgba(34,211,238,.18); }
.toast.err{ border-color: rgba(255,77,109,.20); }

/* Course page */
.coursePage{ padding-top: 18px; padding-bottom: 32px; }
.courseShell2{
  margin-top: 16px;
  display:grid;
  grid-template-columns: 420px 1fr;
  gap: 14px;
  align-items: start;
}
@media (max-width: 1100px){ .courseShell2{ grid-template-columns: 380px 1fr; } }
@media (max-width: 980px){ .courseShell2{ grid-template-columns: 1fr; } }
.courseShell2.sideCollapsed{ grid-template-columns: 84px 1fr; }
@media (max-width: 980px){ .courseShell2.sideCollapsed{ grid-template-columns: 1fr; } }

.sidePanel{
  position: sticky;
  top: 84px;
  align-self: start;
  border-radius: 22px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.10);
  padding: 14px;
  box-shadow: 0 26px 60px rgba(0,0,0,.34);
  max-height: calc(100vh - 110px);
  display:flex;
  flex-direction: column;
}
@media (max-width: 980px){
  .sidePanel{ position: static; max-height: none; }
}
.sidePanel.collapsed{
  padding: 10px;
  align-items: stretch;
}
.sidePanel.collapsed .sideHead > div{ display:none; }
.sidePanel.collapsed .progressCard{ display:none; }
.sidePanel.collapsed .sideTools2{ display:none; }
.sidePanel.collapsed .list2{ display:none; }
.sidePanel.collapsed .sideFoot{ display:none; }
.sidePanel.collapsed .iconBtn{ width: 44px; height: 44px; border-radius: 16px; }
.sideHead{ display:flex; align-items:flex-start; justify-content:space-between; gap: 10px; }
.iconBtn{
  width: 40px; height: 40px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
  color: rgba(233,236,245,.88);
  cursor:pointer;
}
.iconBtn:hover{ background: rgba(255,255,255,.06); }
.progressCard{
  margin-top: 12px;
  padding: 12px;
  border-radius: 18px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
}
.progressLeft{ display:flex; align-items:baseline; justify-content:space-between; gap: 10px; }
.progressPct{ font-weight: 950; font-size: 20px; letter-spacing: -.01em; }
.progressBar2{
  margin-top: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  overflow:hidden;
}
.progressBar2 > div{ height: 100%; width: 0%; background: linear-gradient(90deg, rgba(124,92,255,1), rgba(34,211,238,1)); }

.sideTools2{ margin-top: 12px; display:flex; flex-direction: column; gap: 10px; }
.seg{
  display:flex;
  padding: 4px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(0,0,0,.10);
  gap: 4px;
}
.segBtn{
  flex: 1;
  padding: 10px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: rgba(233,236,245,.70);
  cursor:pointer;
  font-weight: 800;
}
.segBtn:hover{ background: rgba(255,255,255,.04); }
.segBtn.active{
  background: rgba(124,92,255,.14);
  border-color: rgba(124,92,255,.25);
  color: rgba(233,236,245,.92);
}

.list2{
  margin-top: 12px;
  display:flex;
  flex-direction: column;
  gap: 8px;
  overflow:auto;
  padding-right: 2px;
  flex: 1;
}
.list2::-webkit-scrollbar{ width: 10px; }
.list2::-webkit-scrollbar-thumb{
  background: rgba(255,255,255,.10);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.sideFoot{ margin-top: 10px; font-size: 12px; }

.lessonItem{
  display:grid;
  grid-template-columns: 72px 1fr auto;
  gap: 10px;
  align-items:center;
  padding: 10px;
  border-radius: 18px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
  cursor:pointer;
  transition: transform .10s ease, background .10s ease, border-color .10s ease;
}
.lessonItem:hover{ transform: translateY(-1px); background: rgba(255,255,255,.045); }
.lessonItem.active{
  background: linear-gradient(135deg, rgba(124,92,255,.18), rgba(34,211,238,.10));
  border-color: rgba(255,255,255,.12);
  box-shadow: 0 18px 34px rgba(0,0,0,.26);
}
.statusPill{
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: rgba(233,236,245,.70);
  background: rgba(0,0,0,.12);
  border: 1px solid rgba(255,255,255,.10);
}
.statusPill.done{
  color: rgba(207,250,254,.95);
  background: rgba(34,211,238,.10);
  border-color: rgba(34,211,238,.20);
}

.playerPanel{
  border-radius: 22px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.10);
  padding: 14px;
  box-shadow: 0 26px 60px rgba(0,0,0,.34);
}
.playerHeader{ display:flex; align-items:flex-start; justify-content:space-between; gap: 12px; flex-wrap: wrap; }
.playerActions{ display:flex; gap: 10px; flex-wrap: wrap; justify-content:flex-end; }
.btnGhost{
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.03);
  color: rgba(233,236,245,.88);
  cursor:pointer;
  font-weight: 850;
  transition: transform .10s ease, background .10s ease;
}
.btnGhost:hover{ background: rgba(255,255,255,.05); transform: translateY(-1px); }
.btnGhost:active{ transform: translateY(0px); }
.btnGhost:disabled{ opacity:.55; cursor:not-allowed; }
.btnGhost:disabled:hover{ transform:none; background: rgba(255,255,255,.03); }
.btnGhost[aria-disabled="true"]{ opacity:.55; pointer-events:none; }
.btnDanger{ border-color: rgba(255,77,109,.22); }
.btnDanger:hover{ background: rgba(255,77,109,.10); }

.btnGhost.active{
  background: rgba(124,92,255,.14);
  border-color: rgba(124,92,255,.25);
}

.notePanel{
  margin-top: 12px;
  padding: 12px;
  border-radius: 22px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
}
.notePanel.hidden{ display: none; }
.noteTop{ display:flex; align-items:flex-start; justify-content:space-between; gap: 12px; flex-wrap: wrap; }
.noteActions{ display:flex; gap: 10px; flex-wrap: wrap; justify-content:flex-end; }
.select{
  padding: 10px 10px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.14);
  color: rgba(233,236,245,.88);
  outline:none;
}
.textarea{
  width: 100%;
  margin-top: 10px;
  min-height: 120px;
  resize: vertical;
  padding: 12px 12px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.14);
  color: rgba(233,236,245,.88);
  outline:none;
  line-height: 1.55;
}
.textarea:disabled{ opacity: .7; }

.bookmarks{
  margin-top: 10px;
  padding: 10px;
  border-radius: 18px;
  background: rgba(0,0,0,.10);
  border: 1px solid rgba(255,255,255,.08);
  display:flex;
  flex-direction: column;
  gap: 8px;
}
.bmRow{ display:flex; gap: 10px; align-items:center; }
.bmTime{
  flex: 0 0 auto;
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  color: rgba(233,236,245,.90);
  cursor:pointer;
  font-weight: 850;
}
.bmTime:hover{ background: rgba(255,255,255,.05); }
.bmText{
  flex: 1;
  min-width: 0;
  color: rgba(233,236,245,.70);
  font-size: 13px;
  overflow:hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bmDel{
  flex: 0 0 auto;
  width: 34px; height: 34px;
  border-radius: 14px;
  border: 1px solid rgba(255,77,109,.22);
  background: rgba(255,77,109,.08);
  color: rgba(255,210,218,.96);
  cursor:pointer;
  font-weight: 950;
}
.bmDel:hover{ background: rgba(255,77,109,.12); }

.videoShell2{
  margin-top: 12px;
  aspect-ratio: 16 / 9;
  width: 100%;
  border-radius: 22px;
  overflow:hidden;
  background: rgba(0,0,0,.35);
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 26px 60px rgba(0,0,0,.42);
}
.videoShell2 iframe{ width:100%; height:100%; border:0; }

.playerPanel #err{ margin-top: 12px; }

.panelLoading{ margin-top: 16px; }
.skeletonGrid{ margin: 12px 0 12px; display:grid; grid-template-columns: 1fr; gap: 10px; }
.sk{
  height: 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255,255,255,.06), rgba(255,255,255,.12), rgba(255,255,255,.06));
  background-size: 200% 100%;
  animation: shimmer 1.2s ease-in-out infinite;
  border: 1px solid rgba(255,255,255,.06);
}
.skLg{ height: 46px; border-radius: 18px; }
.skMd{ height: 14px; }
@keyframes shimmer{
  0%{ background-position: 0% 0%; }
  100%{ background-position: 200% 0%; }
}