/* ── Course Player CSS v4 ── */
:root{
  --fp-sidebar-w:280px;
  --fp-topbar-h:48px;
  --fp-controls-h:54px;
}

/* ── App shell ── */
.fp-app{display:flex;position:relative;min-height:calc(100vh - var(--aca-header-h,56px));background:var(--c-bg,#080d17);overflow:hidden}

/* Top progress track */
.fp-app__track{position:fixed;top:var(--aca-header-h,56px);left:0;right:0;height:3px;background:rgba(255,255,255,.05);z-index:40}
.fp-app__track-fill{height:100%;background:linear-gradient(90deg,#7c3aed,#818cf8);transition:width .4s ease;border-radius:0 2px 2px 0}

/* Mobile overlay */
.fp-app__backdrop{display:none;position:fixed;inset:0;background:rgba(0,0,0,.65);z-index:45;backdrop-filter:blur(2px)}
.fp-app__backdrop.is-open{display:block}

/* ── SIDEBAR ── */
.fp-sidebar{
  width:var(--fp-sidebar-w);flex-shrink:0;
  background:#08111e;border-right:1px solid rgba(255,255,255,.05);
  display:flex;flex-direction:column;
  position:sticky;top:var(--aca-header-h,56px);
  height:calc(100vh - var(--aca-header-h,56px));
  overflow-y:auto;overflow-x:hidden;
  scrollbar-width:thin;scrollbar-color:rgba(124,58,237,.3) transparent;
}
.fp-sidebar::-webkit-scrollbar{width:4px}
.fp-sidebar::-webkit-scrollbar-track{background:transparent}
.fp-sidebar::-webkit-scrollbar-thumb{background:rgba(124,58,237,.3);border-radius:2px}
.fp-sidebar__head{padding:18px 14px 12px;border-bottom:1px solid rgba(255,255,255,.05)}
.fp-sidebar__label{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:#334155;margin:0 0 5px}
.fp-sidebar__title{font-size:.9375rem;font-weight:700;color:#e2e8f0;margin:0 0 12px;line-height:1.35}
.fp-sidebar__stats{display:flex;align-items:center;gap:12px}
.fp-sidebar__stat-text{display:flex;flex-direction:column;gap:2px}
.fp-sidebar__stat-text strong{font-size:1.05rem;font-weight:800;color:#e2e8f0;line-height:1;display:block}
.fp-sidebar__stat-text span{font-size:.7rem;color:#475569}

/* Progress ring */
.fp-ring{position:relative;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}
.fp-ring__track{stroke:#1e293b}
.fp-ring__fill{stroke:#7c3aed;transition:stroke-dashoffset .6s cubic-bezier(.4,0,.2,1)}
.fp-ring--dark .fp-ring__track{stroke:#0d1629}
.fp-ring__label{position:absolute;font-size:.65rem;font-weight:800;color:#a78bfa;line-height:1}

/* Nav list */
.fp-nav{padding:6px 0;flex:1}
.fp-nav__item{
  display:flex;align-items:center;gap:8px;padding:8px 14px;
  color:#475569;font-size:.825rem;font-weight:500;
  text-decoration:none;line-height:1.35;
  transition:background .12s,color .12s;
  border-left:2px solid transparent;
}
.fp-nav__item:hover{background:rgba(255,255,255,.03);color:#94a3b8}
.fp-nav__item.is-active{background:rgba(124,58,237,.08);border-left-color:#7c3aed;color:#c4b5fd}
.fp-nav__item.is-done{color:#4ade80}
.fp-nav__item.is-done:hover{background:rgba(74,222,128,.04)}
.fp-nav__done-icon{display:none;flex-shrink:0;line-height:0}
.fp-nav__item.is-done .fp-nav__done-icon{display:inline}
.fp-nav__foot{
  padding:10px 14px;border-top:1px solid rgba(255,255,255,.05);
  display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;
}

/* Mobile sidebar */
@media(max-width:960px){
  .fp-sidebar{
    position:fixed;left:0;top:0;bottom:0;height:100vh;z-index:46;
    transform:translateX(-100%);transition:transform .25s cubic-bezier(.4,0,.2,1);
  }
  .fp-sidebar.is-open{transform:translateX(0)}
}

/* ── MAIN ── */
.fp-main{flex:1;display:flex;flex-direction:column;min-width:0;min-height:calc(100vh - var(--aca-header-h,56px))}

/* Topbar */
.fp-topbar{
  position:sticky;top:calc(var(--aca-header-h,56px) + 3px);z-index:30;
  height:var(--fp-topbar-h);
  background:rgba(8,13,23,.88);backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.05);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 16px 0 12px;flex-shrink:0;
}
.fp-topbar__left{display:flex;align-items:center;gap:10px}
.fp-topbar__menu{
  display:none;align-items:center;justify-content:center;
  width:32px;height:32px;border-radius:8px;border:none;
  background:rgba(255,255,255,.05);color:#64748b;cursor:pointer;
  transition:all .15s;flex-shrink:0;
}
.fp-topbar__menu:hover{background:rgba(255,255,255,.09);color:#94a3b8}
@media(max-width:960px){.fp-topbar__menu{display:flex}}
.fp-topbar__crumb{display:flex;align-items:center;gap:6px;font-size:.8rem;overflow:hidden}
.fp-topbar__sep{color:#334155;margin:0 2px}
.fp-topbar__type{color:#64748b;white-space:nowrap}
.fp-topbar__right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.fp-topbar__step{font-size:.82rem;font-weight:700;color:#94a3b8}
.fp-topbar__muted{color:#475569;font-weight:400}

/* Reader bar */
.fp-reader-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:0 20px;height:38px;
  background:rgba(8,13,23,.7);border-bottom:1px solid rgba(255,255,255,.04);
  flex-shrink:0;
}
.fp-reader-bar__group{display:flex;align-items:center;gap:8px}

/* Scrollable content */
.fp-main__scroll{
  flex:1;overflow-y:auto;
  padding-bottom:calc(var(--fp-controls-h) + 24px);
  scrollbar-width:thin;scrollbar-color:rgba(124,58,237,.2) transparent;
}
.fp-main__scroll::-webkit-scrollbar{width:5px}
.fp-main__scroll::-webkit-scrollbar-track{background:transparent}
.fp-main__scroll::-webkit-scrollbar-thumb{background:rgba(124,58,237,.25);border-radius:3px}

/* Page enter animation */
.fp-page-enter{animation:fpFadeIn .22s ease}
@keyframes fpFadeIn{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}

/* ── LESSON ── */
.fp-lesson{max-width:760px;margin:0 auto;padding:32px 24px 48px}
@media(max-width:640px){.fp-lesson{padding:20px 16px 40px}}
.fp-lesson__header{padding-bottom:18px;margin-bottom:22px;border-bottom:1px solid rgba(255,255,255,.06)}
.fp-lesson__title-row{display:flex;align-items:flex-start;gap:12px;margin-bottom:8px}
.fp-lesson__title{font-size:1.65rem;font-weight:800;color:#f8fafc;margin:0;line-height:1.2;letter-spacing:-.02em;flex:1}
@media(max-width:640px){.fp-lesson__title{font-size:1.35rem}}
.fp-lesson__meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:8px}
.fp-lesson__meta-item{display:flex;align-items:center;gap:5px;font-size:.78rem;color:#64748b}
.fp-lesson__content{padding:0 0 24px}
.fp-lesson__content--flow>*+*{margin-top:.75rem}

/* ── BADGES ── */
.fp-badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:999px;font-size:.7rem;font-weight:700}
.fp-badge--muted{background:rgba(255,255,255,.07);color:#64748b;border:1px solid rgba(255,255,255,.09)}
.fp-badge--success{background:rgba(34,197,94,.1);color:#4ade80;border:1px solid rgba(34,197,94,.2)}

/* ── BUTTONS ── */
.fp-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:8px;font-size:.875rem;font-weight:600;border:none;cursor:pointer;text-decoration:none;transition:all .15s;line-height:1}
.fp-btn--primary{background:#7c3aed;color:#fff;box-shadow:0 0 16px rgba(124,58,237,.25)}
.fp-btn--primary:hover{background:#6d28d9;box-shadow:0 4px 20px rgba(124,58,237,.35)}
.fp-btn--ghost{background:rgba(255,255,255,.05);color:#94a3b8;border:1px solid rgba(255,255,255,.09)}
.fp-btn--ghost:hover{background:rgba(255,255,255,.09);color:#e2e8f0}
.fp-btn--sm{padding:6px 12px;font-size:.8rem;border-radius:6px}

/* ── CONTROLS BAR (bottom sticky) ── */
.fp-controls{position:sticky;bottom:0;z-index:35;background:rgba(8,13,23,.96);border-top:1px solid rgba(255,255,255,.07);backdrop-filter:blur(12px);height:var(--fp-controls-h);flex-shrink:0}
.fp-controls__inner{height:100%;display:flex;align-items:center;justify-content:space-between;padding:0 12px;gap:8px}
.fp-controls__nav{display:flex;align-items:center;gap:6px}
.fp-controls__center{flex:1;min-width:0;padding:0 8px}
.fp-controls__lesson-title{font-size:.75rem;color:#64748b;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:0 0 4px}
.fp-controls__bar{height:3px;background:rgba(255,255,255,.06);border-radius:2px;overflow:hidden}
.fp-controls__bar-fill{height:100%;background:linear-gradient(90deg,#7c3aed,#818cf8);transition:width .4s}
.fp-controls__right{display:flex;align-items:center;gap:6px;flex-shrink:0}
.fp-controls__menu{display:none}
@media(max-width:960px){.fp-controls__menu{display:inline-flex}}
.fp-controls__pill{display:none;align-items:center;gap:4px;font-size:.7rem;font-weight:700;padding:3px 8px;border-radius:999px}
.fp-controls__pill--ok{background:rgba(34,197,94,.1);color:#4ade80;border:1px solid rgba(34,197,94,.2)}

/* ── QUIZ ── */
.fp-quiz{background:linear-gradient(140deg,#0d1629,#0a1220);border:1px solid rgba(124,58,237,.22);border-radius:16px;padding:22px;margin-top:2rem}
.fp-quiz__header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.fp-quiz__dots{display:flex;gap:5px;flex-wrap:wrap}
.fp-quiz__dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.1);transition:all .2s}
.fp-quiz__dot.is-done{background:#4ade80;transform:scale(.8)}
.fp-quiz__dot.is-filled{background:#7c3aed;transform:scale(1.1)}
.fp-quiz__qtext{font-size:1rem;font-weight:600;color:#e2e8f0;line-height:1.55}
.fp-quiz__choices{display:flex;flex-direction:column;gap:8px}

/* Choice button */
.fp-quiz__choice{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:11px 14px;border-radius:10px;
  background:rgba(255,255,255,.03);border:1.5px solid rgba(255,255,255,.08);
  color:#94a3b8;font-size:.875rem;text-align:left;cursor:pointer;
  transition:all .15s;font-family:inherit;
}
.fp-quiz__choice:hover:not(:disabled){background:rgba(255,255,255,.06);border-color:rgba(124,58,237,.3);color:#e2e8f0}
.fp-quiz__choice:disabled{cursor:default}
.fp-quiz__choice.is-correct{background:rgba(34,197,94,.1);border-color:rgba(34,197,94,.4);color:#4ade80}
.fp-quiz__choice.is-wrong{background:rgba(239,68,68,.1);border-color:rgba(239,68,68,.35);color:#f87171}
.fp-quiz__choice.is-neutral:disabled{opacity:.5}
.fp-quiz__letter{
  width:28px;height:28px;border-radius:8px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:.72rem;font-weight:800;
  background:rgba(255,255,255,.07);color:#64748b;transition:all .15s;
}
.fp-quiz__choice:hover:not(:disabled) .fp-quiz__letter{background:rgba(124,58,237,.15);color:#a78bfa}
.fp-quiz__letter.is-correct{background:rgba(34,197,94,.2);color:#4ade80}
.fp-quiz__letter.is-wrong{background:rgba(239,68,68,.2);color:#f87171}
.fp-quiz__choice-text{flex:1}

/* Feedback */
.fp-quiz__layer{margin-top:12px;padding:12px 16px;border-radius:10px}
.fp-quiz__layer.is-ok{background:rgba(34,197,94,.08);border:1px solid rgba(34,197,94,.22);color:#4ade80}
.fp-quiz__layer.is-ko{background:rgba(239,68,68,.07);border:1px solid rgba(239,68,68,.2);color:#f87171}
.fp-quiz__layer strong{display:block;margin-bottom:5px;font-size:.85rem}
.fp-quiz__layer p{font-size:.82rem;color:#94a3b8;margin:0}

/* Score screen */
.fp-quiz__score{display:flex;flex-direction:column;align-items:center;padding:16px 0;text-align:center}
.fp-quiz__score-title{font-size:1.1rem;font-weight:800;color:#f8fafc;margin:0 0 6px}
.fp-quiz__score-sub{font-size:.875rem;color:#64748b;margin:0 0 4px}
.fp-quiz__score-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:4px}