/* =========================================================
   VISOR DE CURSO · estilo inspirado en Platzi
   Sidebar de lecciones + panel principal con video/contenido.
   Reutiliza los tokens definidos en style.css (:root).
   ========================================================= */

html, body { height: 100%; }
body.curso-body { overflow: hidden; }

/* ─── BARRA SUPERIOR ─── */
.curso-topbar {
  height: 64px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 20px;
  background: var(--black);
  border-bottom: 1px solid var(--dark-border);
}
.curso-back {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,.75);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  flex-shrink: 0;
  transition: color .2s;
}
.curso-back:hover { color: var(--white); }
.curso-topbar-title {
  flex: 1;
  min-width: 0;
  color: var(--white);
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.curso-topbar-title .icono { margin-right: 8px; }
.curso-progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.curso-progress-bar {
  width: 120px;
  height: 6px;
  border-radius: 999px;
  background: rgba(255,255,255,.12);
  overflow: hidden;
}
.curso-progress-fill {
  height: 100%;
  background: var(--green);
  border-radius: 999px;
  transition: width .3s ease;
  width: 0%;
}
.curso-progress-label {
  font-size: 12px;
  font-weight: 700;
  color: rgba(255,255,255,.6);
  white-space: nowrap;
}
.curso-sidebar-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  flex-shrink: 0;
}
.curso-sidebar-toggle span { width: 20px; height: 2px; background: var(--white); border-radius: 2px; }

/* ─── LAYOUT PRINCIPAL ─── */
.curso-app {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: calc(100vh - 64px);
}

.curso-sidebar-scrim { display: none; }

/* ─── SIDEBAR ─── */
.curso-sidebar {
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 8px 0 40px;
}
.curso-modulo { border-bottom: 1px solid var(--border); }
.curso-modulo-header {
  padding: 16px 20px 8px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}
.curso-modulo-header span.num { color: var(--green-dark); margin-right: 6px; }
.curso-leccion-list { list-style: none; padding-bottom: 8px; }
.curso-leccion-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 13.5px;
  color: var(--text);
  font-family: inherit;
  transition: background .15s;
}
.curso-leccion-item:hover { background: rgba(139,197,63,.08); }
.curso-leccion-item.active { background: var(--green-soft); color: var(--green-dark); font-weight: 700; }
.curso-leccion-check {
  flex-shrink: 0;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px;
  color: transparent;
  transition: all .2s;
}
.curso-leccion-item.done .curso-leccion-check {
  background: var(--green);
  border-color: var(--green);
  color: var(--black);
}
.curso-leccion-item.active .curso-leccion-check { border-color: var(--green-dark); }
.curso-leccion-titulo { flex: 1; line-height: 1.35; }

/* ─── MAIN ─── */
.curso-main { overflow-y: auto; background: var(--bg); }
.curso-main-inner { max-width: 820px; margin: 0 auto; padding: 0 0 80px; }

.curso-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--black);
}
.curso-video-wrap iframe {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  border: none;
}
.curso-video-fallback {
  position: absolute; inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: rgba(255,255,255,.5);
  background-size: cover;
  background-position: center;
}
.curso-video-fallback .icono { font-size: 40px; }
.curso-video-fallback span { font-size: 13px; font-weight: 600; }

.curso-lesson-body { padding: 36px 28px 0; }
.curso-lesson-eyebrow {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--green-dark);
  margin-bottom: 8px;
}
.curso-lesson-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 32px);
  color: var(--black);
  margin-bottom: 28px;
}

.curso-block { margin-bottom: 30px; }
.curso-block h3 {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--black);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.curso-block h3::before { content: ''; width: 16px; height: 3px; border-radius: 2px; background: var(--green); }
.curso-block p { font-size: 15px; line-height: 1.75; color: var(--text); }
.curso-block ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.curso-block ul li {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text);
  padding-left: 22px;
  position: relative;
}
.curso-block ul li::before {
  content: '✓';
  position: absolute;
  left: 0; top: 0;
  color: var(--green-dark);
  font-weight: 800;
  font-size: 13px;
}
.curso-block.recursos ul li::before { content: '›'; font-size: 16px; top: -2px; }

.curso-eval-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.curso-eval-text { font-size: 14px; color: var(--text); line-height: 1.6; max-width: 480px; }
.curso-eval-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--green);
  color: var(--black);
  font-weight: 800;
  font-size: 13.5px;
  border: none;
  padding: 12px 22px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: all .25s;
}
.curso-eval-btn:hover { background: var(--green-dark); color: var(--white); }

.curso-lesson-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  border-top: 1px solid var(--border);
  padding: 28px 28px 0;
}
.curso-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--black);
  font-size: 14px;
  font-weight: 700;
  border: 2px solid var(--black);
  padding: 11px 22px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: all .2s;
}
.curso-nav-btn:hover { background: var(--black); color: var(--white); }
.curso-nav-btn:disabled { opacity: .35; cursor: default; pointer-events: none; }
.curso-nav-btn.complete { background: var(--green); border-color: var(--green); color: var(--black); }
.curso-nav-btn.complete:hover { background: var(--green-dark); border-color: var(--green-dark); color: var(--white); }
.curso-nav-btn.complete.done { background: var(--dark-border); border-color: var(--border-strong); color: var(--muted); }

/* ─── RESPONSIVE ─── */
@media (max-width: 860px) {
  .curso-sidebar-toggle { display: flex; }
  .curso-app { grid-template-columns: 1fr; position: relative; }
  .curso-sidebar {
    position: fixed;
    top: 64px; bottom: 0; left: 0;
    width: 300px;
    max-width: 82vw;
    z-index: 900;
    transform: translateX(-100%);
    transition: transform .25s ease;
    box-shadow: 12px 0 24px rgba(0,0,0,.15);
  }
  .curso-app.sidebar-open .curso-sidebar { transform: translateX(0); }
  .curso-sidebar-scrim {
    position: fixed;
    inset: 64px 0 0 0;
    background: rgba(0,0,0,.35);
    z-index: 850;
  }
  .curso-app.sidebar-open .curso-sidebar-scrim { display: block; }
  .curso-lesson-body, .curso-lesson-nav { padding-left: 20px; padding-right: 20px; }
  .curso-progress-label { display: none; }
}