:root {
  --bg: #000000;
  --panel: #111111;
  --text: #FFFFFF;
  --text-soft: #A8A8A8;
  --dark: #000000;
  --gold: #C5A95E;
  --gold-hover: #B0954A;
  --border: #2B2B2B;
  --track-bg: #1A1A1A;
  --shadow: 0 8px 30px rgba(0,0,0,0.6);
  --radius-lg: 3px;
  --radius-md: 3px;
  --radius-btn: 3px;
  --display: var(--sans);
  --sans: 'Museo Sans', 'Nunito Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; }

button, input, table { font-family: inherit; }

body {
  font-weight: 300;
  color-scheme: dark;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

#loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  color: var(--text-soft);
  font-family: var(--sans);
}

#loading[hidden] { display: none; }

/* ---------- Overlay de acceso ---------- */
#ac-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(17,17,17,0.55);
  z-index: 999999;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
}

#ac-card {
  max-width: 360px;
  width: 90%;
  padding: 36px 30px;
  background: #fff;
  border-radius: 3px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  text-align: center;
}

#ac-card h2 { margin: 0 0 6px; font-size: 20px; color: #111; }
#ac-card p.ac-sub { margin: 0 0 22px; font-size: 14px; color: #777; }

#ac-card input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  border: 1px solid #ddd;
  border-radius: var(--radius-btn);
  font-size: 15px;
  margin-bottom: 14px;
  text-align: center;
  letter-spacing: 0.5px;
}

#ac-card input:focus { outline: none; border-color: var(--gold); }

#ac-card button {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: var(--radius-btn);
  background: var(--gold);
  color: var(--dark);
  border: 1px solid var(--gold);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  cursor: pointer;
  transition: background 0.15s;
}

#ac-card button:hover { background: var(--gold-hover); border-color: var(--gold-hover); }
#ac-card button:disabled { background: #e6dcc0; color: #7a7a7a; border-color: #e6dcc0; cursor: default; }

#ac-mensaje { margin-top: 14px; font-size: 13px; min-height: 18px; }
#ac-mensaje.ac-error { color: #d92d20; }
#ac-mensaje.ac-ok { color: #12805c; }
.ac-oculto { display: none; }

#ac-icono { width: 240px; max-width: 100%; margin: 0 auto 16px; }
#ac-icono img { width: 100%; height: auto; display: block; }

/* ---------- App ---------- */
.app {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.topbar {
  position: sticky;
  top: 14px;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: #000;
  border-radius: 12px;
  padding: 14px 28px;
  margin: 16px 0 0;
}
.topbar-brand img { height: 34px; width: auto; display: block; }
.topbar-nav { display: flex; align-items: center; gap: 30px; }
.topbar-nav a {
  font-size: 15px;
  font-weight: 500;
  color: #fff;
  text-decoration: none;
  padding: 4px 0;
  transition: color .15s ease;
}
.topbar-nav a:hover, .topbar-nav a.active { color: var(--gold); }
.topbar-nav a.ac-oculto { display: none; }
.page-title { font-weight: 900; font-size: clamp(28px, 4vw, 40px); margin: 40px 0 22px; }
.page-title span { color: var(--gold); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  text-align: center;
  padding: 34px 0 30px;
  margin-bottom: 26px;
  overflow: hidden;
}
.hero-kicker {
  margin: 0;
  font-style: italic;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .01em;
  font-size: clamp(22px, 5vw, 46px);
  line-height: 1;
  color: #fff;
}
.hero-title { margin: 0; line-height: 0; }
.hero-one { width: min(58vw, 300px); height: auto; display: block; margin: 8px auto 0; }
.hero-sub { margin: 16px 0 20px; font-size: clamp(14px, 2vw, 17px); font-weight: 300; color: #fff; }
.hero-sub strong { font-weight: 700; color: var(--gold); }
.hero-progress { max-width: 400px; margin: 0 auto 20px; }
.bar { height: 6px; background: #2a2a2a; border-radius: 3px; overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--gold); transition: width .5s ease; }
.hero-progress .progress-summary { margin: 10px 0 0; text-align: center; }
.section-title { font-weight: 900; font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 18px; }
.section-title span { color: var(--gold); }

.app-footer {
  text-align: center;
  color: var(--text-soft);
  font-size: 13px;
  padding: 30px 0 10px;
}

/* ---------- Course intro accordion ---------- */
.course-intro-card {
  background: var(--panel);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 20px;
  overflow: hidden;
}

.course-intro-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  transition: background .15s ease;
}

.course-intro-header h2 { margin: 0; font-size: 16px; font-weight: 900; }

.course-intro-toggle {
  flex: 0 0 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-soft);
  transition: transform .3s ease;
}

.course-intro-card.collapsed .course-intro-toggle { transform: rotate(-90deg); }

.course-intro-body {
  font-family: var(--sans);
  font-size: clamp(14px, 2.2vw, 16px);
  font-weight: 300;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-line;
  max-height: 500px;
  overflow: hidden;
  padding: 0 20px 16px;
  transition: max-height .3s ease, opacity .3s ease, padding .3s ease;
  opacity: 1;
}

.course-intro-card.collapsed .course-intro-body {
  max-height: 0;
  opacity: 0;
  padding: 0 20px;
}

/* ---------- Progreso ---------- */
.progress-summary {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 14px;
  color: var(--text-soft);
  margin: 0 0 14px 4px;
}

.progress-summary strong { color: #fff; }

/* ---------- Playlist ---------- */
.playlist-wrapper {
  background: transparent;
}

#playlist { list-style: none; margin: 0; padding: 0; }

.track-item {
  display: flex;
  flex-direction: column;
  margin-bottom: 10px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--track-bg);
  border: 1px solid var(--border);
  transition: all .2s ease;
}

.track-item.locked { opacity: .55; }

.track-item.expanded {
  background: #000;
  color: #fff;
  border-color: var(--gold);
}

.track-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  transition: background .15s ease;
}

.track-item.locked .track-header { cursor: not-allowed; }

.track-num {
  flex: 0 0 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

.track-item.expanded .track-num { background: rgba(255,255,255,0.15); }
.track-item.completed .track-num { background: var(--gold); color: #fff; }

.track-title { flex: 1; font-size: 14px; font-weight: 500; color: inherit; }
.module {
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--panel);
  overflow: hidden;
}
.module-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  cursor: pointer;
}
.module-name { flex: 1; font-size: 18px; font-weight: 900; color: #fff; }
.module-count { font-size: 12px; font-weight: 500; color: var(--text-soft); }
.module.open .toggle-arrow { transform: rotate(180deg); }
.module-body { list-style: none; margin: 0; padding: 0 12px; max-height: 0; overflow: hidden; }
.module.open .module-body { max-height: none; padding: 0 12px 12px; }
.track-status { font-size: 12px; color: var(--text-soft); }
.track-item.expanded .track-status { color: rgba(255,255,255,0.7); }

.lock-icon { font-size: 13px; color: var(--text-soft); }

.toggle-arrow {
  flex: 0 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-soft);
  transition: transform .3s ease;
}

.track-item.expanded .toggle-arrow { transform: rotate(180deg); color: rgba(255,255,255,0.7); }

.track-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.track-item.expanded .track-content { max-height: 900px; }

.video-player {
  padding: 14px 14px 0;
}

.video-player .video-frame {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.video-player iframe { width: 100%; height: 100%; border: 0; display: block; }

.track-description {
  padding: 14px;
}

.desc-body {
  font-family: var(--sans);
  font-size: clamp(15px, 2.5vw, 17px);
  font-weight: 300;
  line-height: 1.7;
  white-space: pre-line;
  word-wrap: break-word;
  margin: 0 0 16px;
}

.btn-gold, .btn-completar {
  border: none;
  border-radius: var(--radius-btn);
  padding: 14px 26px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  cursor: pointer;
  background: var(--gold);
  color: var(--dark);
  transition: background .15s ease;
}

.btn-gold { padding: 14px 28px; font-size: 13px; }
.btn-gold:hover, .btn-completar:hover { background: var(--gold-hover); }
.btn-completar:disabled { background: rgba(255,255,255,0.15); color: rgba(255,255,255,0.5); cursor: default; }

.marcado-completo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
}

/* ---------- Admin ---------- */
.admin-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}
.admin-estado { margin: 0 0 12px; font-size: 14px; color: var(--text-soft); }
.btn-outline {
  background: var(--gold);
  color: var(--dark);
  border: 1px solid var(--gold);
  border-radius: var(--radius-btn);
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  cursor: pointer;
}
.btn-outline:hover { background: var(--gold-hover); border-color: var(--gold-hover); }
.btn-outline:disabled { opacity: .5; cursor: default; }

.admin-table-wrapper {
  background: var(--panel);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: auto;
}

table.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.admin-table th, table.admin-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

table.admin-table th { color: var(--text-soft); font-weight: 600; font-size: 12px; text-transform: uppercase; }

.instrucciones-lista { list-style: none; padding: 0; margin: 0; }
.instrucciones-lista li {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 10px;
}
.instrucciones-lista a { color: var(--gold); font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .app { padding: 0 14px 40px; }
  .topbar { padding: 10px 12px; gap: 8px; top: 8px; }
  .topbar-brand img { height: 22px; }
  .topbar-nav { gap: 12px; }
  .topbar-nav a { font-size: 12px; white-space: nowrap; }
  .hero { padding: 36px 0 32px; }
  .track-header { padding: 12px 12px; }
  .track-num { flex: 0 0 24px; height: 24px; font-size: 10px; }
  .track-title { font-size: 13px; }
}

h2.display { font-weight: 900; font-size: 24px; margin: 0 0 14px; }
h2.display span { color: var(--gold); }