:root{
  --bg:#0b1020;
  --panel:#0f1630;
  --panel2:#111b38;
  --text:#e8ecff;
  --muted:#9aa7d6;
  --accent:#7aa2ff;
  --accent2:#57f287;
  --danger:#ff5d7a;
  --border:#23305c;
  --shadow: 0 16px 50px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter, system-ui, -apple-system, Segoe UI, Arial;
  background: radial-gradient(900px 400px at 20% 10%, rgba(122,162,255,.18), transparent 60%),
              radial-gradient(900px 400px at 80% 0%, rgba(87,242,143,.12), transparent 55%),
              var(--bg);
  color:var(--text);
}

a{color:inherit; text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:0 16px}

.topbar{position:sticky;top:0;z-index:10;background:rgba(11,16,32,.72);backdrop-filter: blur(10px);border-bottom:1px solid rgba(35,48,92,.65)}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px}
.brand__dot{width:10px;height:10px;border-radius:999px;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 0 0 4px rgba(122,162,255,.15)}
.brand__text{font-weight:700;letter-spacing:.2px}
.nav{display:flex;gap:12px}
.nav__link{padding:8px 12px;border-radius:10px;color:var(--muted);border:1px solid transparent}
.nav__link:hover{border-color:rgba(35,48,92,.9);color:var(--text)}
.nav__link.is-active{color:var(--text);border-color:rgba(122,162,255,.45);background:rgba(122,162,255,.08)}

/* Dropdown groups in header menu */
.nav__dropdown{position:relative;display:flex}
.nav__toggle{background:transparent}
.nav__caret{opacity:.7;margin-left:4px}
.nav__menu{position:absolute;top:calc(100% + 8px);left:0;min-width:220px;max-width:320px;
  background:var(--panel);border:1px solid rgba(35,48,92,.95);border-radius:14px;padding:8px;
  box-shadow:0 18px 50px rgba(0,0,0,.35);display:none;z-index:60}
.nav.nav--hover .nav__dropdown:hover .nav__menu{display:block}
.nav__dropdown.is-open .nav__menu{display:block}
.nav__item{display:block;padding:10px 10px;border-radius:12px;color:var(--muted);border:1px solid transparent;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav__item:hover{border-color:rgba(122,162,255,.35);background:rgba(122,162,255,.08);color:var(--text)}

.layout{display:grid;grid-template-columns: 1fr 320px;gap:16px;align-items:start;padding:18px 0 30px}
@media (max-width: 980px){
  .layout{grid-template-columns:1fr}
}

.card{
  background: linear-gradient(180deg, rgba(17,27,56,.92), rgba(15,22,48,.92));
  border:1px solid rgba(35,48,92,.75);
  border-radius:16px;
  box-shadow: var(--shadow);
}
.card__pad{padding:14px}
.card__title{font-weight:700;margin:0 0 10px}

.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:720px){.grid{grid-template-columns:1fr}}

.hero{padding:18px}
.hero h1{margin:0 0 6px;font-size:26px}
.hero p{margin:0;color:var(--muted)}

.controls{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.input{
  flex:1;
  min-width:220px;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(35,48,92,.9);
  background:rgba(11,16,32,.55);
  color:var(--text);
  outline:none;
}
.select{
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(35,48,92,.9);
  background:rgba(11,16,32,.55);
  color:var(--text);
  outline:none;
}
select option{color:#0b1020;background:#fff}

.btn{
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(35,48,92,.9);
  background:rgba(122,162,255,.12);
  color:var(--text);
  cursor:pointer;
  font-weight:600;
}
.btn:hover{transform: translateY(-1px)}
.btn--ghost{background:transparent;color:var(--muted)}
.btn--danger{background:rgba(255,93,122,.12)}
.btn--ok{background:rgba(87,242,143,.12)}

.list{display:flex;flex-direction:column;gap:10px}
.course{
  padding:14px;
  display:flex;
  gap:12px;
  border-radius:14px;
  border:1px solid rgba(35,48,92,.75);
  background:rgba(11,16,32,.25);
}
.course:hover{border-color:rgba(122,162,255,.45)}
.course__cover{width:110px;height:72px;border-radius:12px;overflow:hidden;flex:0 0 auto;border:1px solid rgba(35,48,92,.7);background:rgba(15,22,48,.7)}
.course__cover img{width:100%;height:100%;object-fit:cover;display:block}
.course__meta{flex:1;min-width:0}
.course__title{font-weight:700;margin:0 0 4px}
.course__excerpt{margin:0;color:var(--muted);font-size:14px;line-height:1.35}
.badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.badge{font-size:12px;padding:4px 8px;border-radius:999px;border:1px solid rgba(35,48,92,.8);color:var(--muted);background:rgba(15,22,48,.4)}

.sidebar .card{margin-bottom:12px}
.small-list{display:flex;flex-direction:column;gap:8px}
.small-link{padding:10px 12px;border-radius:12px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.25);color:var(--muted)}
.small-link:hover{color:var(--text);border-color:rgba(122,162,255,.45)}

/* My List rows (LocalStorage) */
.mylist-item{display:flex;align-items:center;gap:10px}
.mylist-item .small-link{flex:1}
.mylist-remove{width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.25);color:var(--muted);cursor:pointer}
.mylist-remove:hover{color:var(--text);border-color:rgba(122,162,255,.45)}

.h1{font-size:22px;margin:0 0 6px}
.muted{color:var(--muted)}
.tiny{font-size:12px;color:var(--muted)}
.kbd{font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;font-size:12px;padding:2px 6px;border-radius:8px;border:1px solid rgba(35,48,92,.85);background:rgba(11,16,32,.35)}

.modules{display:flex;flex-direction:column;gap:10px}
.module{
  padding:12px;
  border-radius:14px;
  border:1px solid rgba(35,48,92,.75);
  background:rgba(11,16,32,.25);
}
.module:hover{border-color:rgba(122,162,255,.45)}
.module__row{display:flex;justify-content:space-between;gap:10px;align-items:center}
.module__title{font-weight:700;margin:0}
.module__type{font-size:12px;color:var(--muted)}
.module__content{margin-top:12px;display:none}
.module.is-open .module__content{display:block}
.module__content .prose{color:var(--text);line-height:1.6}
.prose p{margin:0 0 10px}
.prose a{color:var(--accent);text-decoration:underline}

iframe.yt{width:100%;aspect-ratio:16/9;border:0;border-radius:14px;overflow:hidden}

hr.sep{border:none;border-top:1px solid rgba(35,48,92,.75);margin:14px 0}

/* Admin */
.admin-top{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.table{width:100%;border-collapse:separate;border-spacing:0 8px}
.table th{color:var(--muted);font-weight:600;text-align:left;padding:0 10px 4px}
.table td{padding:12px 10px;background:rgba(11,16,32,.25);border:1px solid rgba(35,48,92,.75)}
.table tr td:first-child{border-radius:12px 0 0 12px}
.table tr td:last-child{border-radius:0 12px 12px 0}
.table a{color:var(--accent)}

.form{display:grid;gap:10px}
.label{font-size:13px;color:var(--muted)}
.textarea{min-height:160px;resize:vertical}
.row{display:flex;gap:10px;flex-wrap:wrap}
.note{font-size:12px;color:var(--muted)}
.alert{padding:10px 12px;border-radius:12px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.25)}
.alert--ok{border-color:rgba(87,242,143,.35)}
.alert--bad{border-color:rgba(255,93,122,.35)}

.ad__box{padding:14px;border-radius:12px;border:1px dashed rgba(35,48,92,.9);background:rgba(11,16,32,.25);text-align:center}

.ad{margin-bottom:12px}
.ad__title{font-weight:700;margin:0 0 10px}
.ad--wide{padding:14px}

.coursewrap{position:relative}
.course-save{position:absolute;top:12px;right:12px;z-index:2;padding:8px 10px;border-radius:999px;border:1px solid rgba(35,48,92,.9);background:rgba(11,16,32,.55);color:var(--muted);cursor:pointer;font-weight:700}
.course-save:hover{color:var(--text);border-color:rgba(122,162,255,.45)}
.course-save.is-saved{color:var(--text);background:rgba(87,242,143,.10);border-color:rgba(87,242,143,.35)}

.mylist__row{display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.mylist__actions{display:flex;gap:8px;flex-wrap:wrap}


/* Quiz */
.quiz{display:grid;gap:12px}
.q{padding:12px;border-radius:14px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.25)}
.q__title{font-weight:700;margin:0 0 8px}
.opt{display:flex;gap:10px;align-items:flex-start;margin:6px 0;color:var(--text)}
.opt input{margin-top:3px}
.score{padding:10px 12px;border-radius:12px;border:1px solid rgba(35,48,92,.75);background:rgba(122,162,255,.08)}

/* Module items + progress (public) */
.module__actions{display:flex;align-items:center;gap:10px}
.check{display:flex;align-items:center;gap:8px;padding:6px 10px;border-radius:12px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.15);color:var(--muted);user-select:none}
.check:hover{border-color:rgba(122,162,255,.45);color:var(--text)}
.check input{accent-color:var(--accent)}

.module-item{padding:12px;border-radius:14px;border:1px solid rgba(35,48,92,.75);background:rgba(15,22,48,.35);margin-bottom:10px}
.module-item:last-child{margin-bottom:0}
.module-item__title{font-weight:700;margin:0 0 10px;color:var(--text)}

.progress{margin-top:10px;padding:12px;border-radius:14px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.25)}
.progress__row{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.progress__bar{margin-top:10px;height:10px;border-radius:999px;border:1px solid rgba(35,48,92,.75);background:rgba(11,16,32,.25);overflow:hidden}
.progress__fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--accent2))}