:root {
  --bg: #0b0d12;
  --bg-2: #11141b;
  --bg-3: #181c25;
  --line: #232838;
  --text: #e7ecf3;
  --text-dim: #9aa3b3;
  --text-mut: #6b7385;
  --accent: #4ea3ff;
  --accent-2: #7c5cff;
  --ok: #34d399;
  --err: #f87171;
  --warn: #fbbf24;
  --radius: 12px;
  --radius-lg: 18px;
  --shadow: 0 8px 28px rgba(0,0,0,0.35);
  --maxw: 1280px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; }

/* ====== top bar ====== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11,13,18,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-in {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.4px;
  color: var(--text);
}
.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 12px rgba(124,92,255,0.6);
}
.crumbs {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-dim);
}
.crumbs a { color: var(--text-dim); }
.crumbs .sep { color: var(--text-mut); }
.crumbs .here { color: var(--text); }
.back-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 14px;
}
.back-btn:hover { border-color: var(--accent); color: var(--accent); }
.lang-switch {
  display: inline-flex;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  background: transparent;
  border: 0;
  color: var(--text-dim);
  padding: 6px 14px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.lang-switch button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0d12;
}

/* ====== page ====== */
.page {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 20px 80px;
}
.hero {
  padding: 32px 0 8px;
}
.hero h1 {
  font-size: 36px;
  margin: 0 0 6px;
  letter-spacing: -0.4px;
}
.hero .sub {
  color: var(--text-dim);
  font-size: 16px;
  margin: 0;
}

/* ====== catalog cards ====== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.cat-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .15s ease, border-color .15s ease;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}
.cat-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.cat-card .cover {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #1a2540, #0e1320);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.cat-card .cover .mark {
  font-size: 72px;
  font-weight: 900;
  letter-spacing: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.cat-card .body { padding: 18px 18px 16px; }
.cat-card .body h3 { margin: 0 0 6px; font-size: 19px; }
.cat-card .body p { margin: 0; color: var(--text-dim); font-size: 14px; }
.cat-card .footer {
  border-top: 1px solid var(--line);
  padding: 12px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-dim);
}
.cat-card .footer .enter { color: var(--accent); font-weight: 600; }
.cat-card.soon { opacity: 0.55; cursor: default; }
.cat-card.soon:hover { transform: none; border-color: var(--line); }

/* ====== module grid ====== */
.mod-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 22px;
}
.mod-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform .15s ease, border-color .15s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}
.mod-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.mod-card .poster {
  aspect-ratio: 16/9;
  background: #000;
  position: relative;
  overflow: hidden;
}
.mod-card .poster img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.mod-card .num {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(0,0,0,0.7);
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.5px;
}
.mod-card .body { padding: 14px 14px 8px; flex: 1; }
.mod-card .body h4 {
  margin: 0 0 6px;
  font-size: 15.5px;
  line-height: 1.35;
  letter-spacing: -0.2px;
}
.mod-card .body p {
  margin: 0;
  color: var(--text-dim);
  font-size: 13px;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.mod-card .badges {
  display: flex;
  gap: 6px;
  padding: 0 14px 14px;
  flex-wrap: wrap;
}
.mod-card.soon {
  cursor: default;
  background: var(--bg-2);
}
.mod-card.soon:hover {
  transform: none;
  border-color: var(--line);
}
.mod-card.soon .body h4 { color: var(--text-dim); }
.mod-card.soon .body p.soon-msg {
  color: var(--text-mut);
  font-size: 13px;
}

/* ====== onboarding section ====== */
.onboarding-card {
  margin-top: 24px;
  padding: 22px 26px;
  background: linear-gradient(135deg, rgba(78,163,255,0.10) 0%, rgba(124,92,255,0.06) 100%);
  border: 1px solid rgba(78,163,255,0.30);
  border-radius: var(--radius-lg);
}
.onb-eyebrow-row {
  font-size: 11px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
}
.onb-blocks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
@media (max-width: 760px) {
  .onb-blocks { grid-template-columns: 1fr; }
}
.onb-block {
  background: rgba(0,0,0,0.20);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
}
.onb-block-survey {
  background: rgba(124,92,255,0.07);
  border-color: rgba(124,92,255,0.30);
}
.onb-block-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.1px;
  margin-bottom: 6px;
}
.onb-block-desc {
  color: var(--text-dim);
  font-size: 13.5px;
  line-height: 1.5;
  margin-bottom: 14px;
  flex: 1;
}
.onb-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.onb-skip {
  color: var(--text-mut);
  font-size: 13px;
  text-decoration: none;
}
.onb-skip:hover {
  color: var(--text-dim);
  text-decoration: underline;
}

.onb-resources {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.onb-res-label {
  font-size: 11px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-mut);
  margin-right: 4px;
}
.onb-res-chip {
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.10);
  color: var(--text-dim);
  text-decoration: none;
  transition: background .12s, border-color .12s, color .12s;
}
.onb-res-chip:hover {
  background: rgba(78,163,255,0.10);
  border-color: rgba(78,163,255,0.35);
  color: var(--text);
}
.poster.soon-poster {
  position: relative;
  background:
    radial-gradient(120% 80% at 30% 30%, rgba(78,163,255,0.10) 0%, transparent 55%),
    radial-gradient(120% 80% at 75% 75%, rgba(124,92,255,0.10) 0%, transparent 55%),
    linear-gradient(160deg, #161b2a 0%, #0c1019 100%);
}
.poster.soon-poster .num {
  background: rgba(0,0,0,0.55);
  color: var(--text-dim);
}
.soon-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  pointer-events: none;
}
.soon-ico {
  font-size: 30px;
  opacity: 0.55;
  filter: grayscale(0.6);
}
.soon-label {
  font-size: 10.5px;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-dim);
  background: rgba(255,255,255,0.04);
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.10);
}
.badge {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.badge.on { background: rgba(78,163,255,0.10); color: #b3d4ff; border-color: rgba(78,163,255,0.40); }

/* ====== module page ====== */
.mod-head { padding: 22px 0 12px; }
.mod-head .num-big {
  display: inline-block;
  padding: 4px 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0d12;
  font-weight: 800;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.5px;
}
.mod-head h1 {
  font-size: 30px;
  margin: 10px 0 8px;
  letter-spacing: -0.4px;
}
.mod-head .sub { color: var(--text-dim); margin: 0; max-width: 760px; }

.tabs {
  display: flex;
  gap: 4px;
  margin: 24px 0 0;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.tab {
  background: transparent;
  border: 0;
  color: var(--text-dim);
  padding: 12px 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}
.tab.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.tab .icon { font-size: 16px; }

.tab-content { padding: 24px 0; }
.panel { display: none; }
.panel.active { display: block; animation: fade .15s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* video panel */
.video-wrap {
  position: relative;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.video-wrap video {
  width: 100%;
  display: block;
}
.cinema-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(0,0,0,0.65);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  z-index: 5;
}
.cinema-btn:hover { background: rgba(78,163,255,0.85); color: #0b0d12; border-color: transparent; }

/* iframe panels (loop/ejercicio) */
.frame-wrap {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 75vh;
  min-height: 600px;
}
.frame-wrap iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: white;
}

/* placeholder banner */
.pending {
  background: var(--bg-2);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 60px 24px;
  text-align: center;
  color: var(--text-dim);
}
.pending h3 { color: var(--text); margin: 0 0 8px; }

/* quiz */
.quiz {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 760px;
}
.quiz h3 { margin: 0 0 18px; font-size: 18px; }
.q { padding: 14px 0; border-top: 1px solid var(--line); }
.q:first-of-type { border-top: 0; padding-top: 0; }
.q .qtext { font-weight: 600; margin: 0 0 10px; }
.q .opts { display: flex; flex-direction: column; gap: 8px; }
.q .opt {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  background: var(--bg-3);
  transition: border-color .12s ease;
}
.q .opt:hover { border-color: var(--accent); }
.q .opt input { margin-top: 3px; accent-color: var(--accent); }
.q.checked .opt.correct { border-color: var(--ok); background: rgba(52,211,153,0.10); }
.q.checked .opt.wrong { border-color: var(--err); background: rgba(248,113,113,0.10); }
.q .explain {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-dim);
  border-left: 2px solid var(--accent);
  padding-left: 10px;
  display: none;
}
.q.checked .explain { display: block; }
.quiz-actions {
  display: flex;
  gap: 10px;
  margin-top: 22px;
  align-items: center;
}
.btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0d12;
  border: 0;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  font-size: 14px;
}
.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn.secondary.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0d12;
  border-color: transparent;
}
.quiz-score { color: var(--text-dim); font-size: 14px; }

/* foro */
.foro {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  max-width: 640px;
}
.foro h3 { margin: 0 0 10px; }
.foro p { color: var(--text-dim); margin: 0 0 22px; }

/* cine */
body.cinema { background: #000; }
.cinema-page {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
}
.cinema-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 22px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.7), rgba(0,0,0,0));
  z-index: 10;
  color: white;
}
.cinema-bar .ttl { font-weight: 600; font-size: 14px; }
.cinema-close {
  background: rgba(255,255,255,0.10);
  color: white;
  border: 1px solid rgba(255,255,255,0.20);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
}
.cinema-close:hover { background: rgba(255,255,255,0.20); }
.cinema-video {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cinema-video video {
  max-width: 100%;
  max-height: 100vh;
  width: auto;
  height: auto;
}

@media (max-width: 720px) {
  .hero h1 { font-size: 26px; }
  .mod-head h1 { font-size: 22px; }
  .page { padding: 20px 14px 60px; }
  .topbar-in { padding: 12px 14px; gap: 10px; }
  .crumbs { font-size: 12px; }
  .frame-wrap { height: 70vh; min-height: 460px; }
}