/* Level Up Learning — estilos. Tema oscuro (default) y claro vía variables CSS. */

/* Rendimiento: no renderiza secciones del acordeón fuera de pantalla (Celeron) */
.accordion-item { content-visibility: auto; contain-intrinsic-size: auto 120px; }

/* Accesibilidad + ahorro de CPU: respeta a quien pide menos movimiento */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

:root, [data-theme="dark"] {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --bg-card: #1e293b;
  --bg-input: #0f172a;
  --border: #334155;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --primary: #6366f1;
  --primary-soft: rgba(99, 102, 241, .15);
  --accent: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 4px 16px rgba(0, 0, 0, .35);
}

[data-theme="light"] {
  --bg: #f1f5f9;
  --bg-soft: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f8fafc;
  --border: #cbd5e1;
  --text: #0f172a;
  --text-dim: #64748b;
  --primary: #4f46e5;
  --primary-soft: rgba(79, 70, 229, .1);
  --accent: #059669;
  --danger: #dc2626;
  --warning: #d97706;
  --shadow: 0 4px 16px rgba(15, 23, 42, .08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  transition: background .25s, color .25s;
}
.hidden { display: none !important; }
a { color: var(--primary); text-decoration: none; }

/* ---------- Barra superior ---------- */
#topbar {
  display: flex; align-items: center; gap: 18px;
  padding: 10px 22px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.brand-icon {
  font-size: 1.5rem; color: #fff; background: var(--primary);
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center; font-weight: bold;
}
.brand-text { font-size: 1.1rem; font-weight: 300; letter-spacing: .5px; }
.brand-text b { color: var(--primary); }
#main-nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
#main-nav a {
  color: var(--text-dim); padding: 7px 13px; border-radius: 8px;
  font-size: .92rem; font-weight: 500;
}
#main-nav a:hover { background: var(--primary-soft); color: var(--text); }
#main-nav a.active { background: var(--primary-soft); color: var(--primary); }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.user-chip { font-size: .85rem; color: var(--text-dim); }
.user-chip b { color: var(--text); }
.role-tag {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .5px;
  padding: 2px 8px; border-radius: 20px; margin-left: 6px;
  background: var(--primary-soft); color: var(--primary); font-weight: 700;
}
.role-tag.root { background: rgba(239, 68, 68, .15); color: var(--danger); }
.role-tag.profesor { background: rgba(16, 185, 129, .15); color: var(--accent); }

/* ---------- Contenedor ---------- */
#app { max-width: 1080px; margin: 0 auto; padding: 26px 18px 60px; }
.page-title { font-size: 1.45rem; font-weight: 700; margin: 0 0 4px; }
.page-sub { color: var(--text-dim); margin: 0 0 22px; font-size: .95rem; }

/* ---------- Botones, inputs ---------- */
.btn {
  border: none; border-radius: 9px; padding: 9px 18px;
  font-size: .92rem; font-weight: 600; cursor: pointer;
  background: var(--primary); color: #fff;
  transition: filter .15s, transform .1s;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--text-dim); }
.btn-danger { background: var(--danger); }
.btn-accent { background: var(--accent); }
.btn-sm { padding: 5px 12px; font-size: .82rem; }
.icon-btn {
  background: transparent; border: 1px solid var(--border); border-radius: 9px;
  width: 36px; height: 36px; cursor: pointer; font-size: 1rem;
  display: grid; place-items: center;
}
.icon-btn:hover { background: var(--primary-soft); }

input, select, textarea {
  width: 100%; padding: 10px 12px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--bg-input); color: var(--text);
  font-size: .95rem; font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); border-color: transparent; }
label { display: block; font-size: .82rem; color: var(--text-dim); margin: 12px 0 5px; font-weight: 600; }
.field-row { display: flex; gap: 12px; }
.field-row > div { flex: 1; }

/* ---------- Tarjetas ---------- */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px; box-shadow: var(--shadow);
}
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }

/* ---------- Login ---------- */
.auth-wrap {
  min-height: calc(100vh - 60px); display: grid; place-items: center; padding: 20px;
}
.auth-card { width: 100%; max-width: 410px; }
.auth-logo { text-align: center; margin-bottom: 18px; }
.auth-logo .brand-icon { width: 60px; height: 60px; font-size: 2.2rem; margin: 0 auto 10px; border-radius: 16px; }
.auth-logo h1 { font-size: 1.5rem; margin: 0; font-weight: 300; }
.auth-logo h1 b { color: var(--primary); }
.auth-logo p { color: var(--text-dim); font-size: .88rem; margin: 6px 0 0; }
.auth-tabs { display: flex; gap: 6px; margin-bottom: 14px; }
.auth-tabs button {
  flex: 1; padding: 9px; border-radius: 9px; border: 1px solid var(--border);
  background: transparent; color: var(--text-dim); cursor: pointer; font-weight: 600;
}
.auth-tabs button.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.demo-creds {
  margin-top: 16px; font-size: .78rem; color: var(--text-dim);
  border-top: 1px dashed var(--border); padding-top: 12px; line-height: 1.7;
}
.demo-creds code { background: var(--primary-soft); padding: 1px 6px; border-radius: 5px; color: var(--primary); }

/* ---------- Curso card ---------- */
.course-card { cursor: pointer; transition: transform .15s, border-color .15s; position: relative; overflow: hidden; }
.course-card:hover { transform: translateY(-3px); border-color: var(--primary); }
.course-card .course-icon {
  font-size: 1.3rem; font-weight: bold; color: #fff;
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  margin-bottom: 12px; font-family: Georgia, serif;
}
.course-card h3 { margin: 0 0 6px; font-size: 1.08rem; }
.course-card p { margin: 0 0 14px; color: var(--text-dim); font-size: .86rem; line-height: 1.45; }
.course-meta { display: flex; justify-content: space-between; font-size: .78rem; color: var(--text-dim); margin-bottom: 8px; }
.draft-tag {
  position: absolute; top: 14px; right: 14px;
  background: rgba(245, 158, 11, .15); color: var(--warning);
  font-size: .68rem; font-weight: 700; padding: 3px 9px; border-radius: 20px; text-transform: uppercase;
}

/* ---------- Barras de progreso ---------- */
.progress-bar { height: 8px; background: var(--bg-input); border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
.progress-bar > div { height: 100%; background: var(--primary); border-radius: 6px; transition: width .4s; }
.progress-bar.green > div { background: var(--accent); }

/* ---------- Módulos ---------- */
.module-row {
  display: flex; align-items: center; gap: 16px; padding: 16px 18px;
  cursor: pointer; transition: border-color .15s;
}
.module-row:hover { border-color: var(--primary); }
.module-num {
  min-width: 38px; height: 38px; border-radius: 10px;
  background: var(--primary-soft); color: var(--primary);
  display: grid; place-items: center; font-weight: 700;
}
.module-row.done .module-num { background: rgba(16, 185, 129, .15); color: var(--accent); }
.module-info { flex: 1; }
.module-info h4 { margin: 0 0 3px; font-size: .98rem; }
.module-info p { margin: 0; font-size: .82rem; color: var(--text-dim); }
.module-stats { text-align: right; font-size: .8rem; color: var(--text-dim); min-width: 90px; }

/* ---------- Ejercicios ---------- */
.exercise-row { display: flex; align-items: center; gap: 14px; padding: 14px 18px; cursor: pointer; }
.exercise-row:hover { border-color: var(--primary); }
.exercise-row.solved { opacity: .75; }
.ex-status { font-size: 1.15rem; }
.ex-info { flex: 1; }
.ex-info h4 { margin: 0; font-size: .95rem; }
.ex-tags { display: flex; gap: 6px; margin-top: 5px; flex-wrap: wrap; }
.tag {
  font-size: .68rem; padding: 2px 9px; border-radius: 20px; font-weight: 600;
  background: var(--primary-soft); color: var(--primary);
}
.tag.facil { background: rgba(16, 185, 129, .14); color: var(--accent); }
.tag.media { background: rgba(245, 158, 11, .14); color: var(--warning); }
.tag.dificil { background: rgba(239, 68, 68, .14); color: var(--danger); }
.ex-points { font-weight: 700; color: var(--primary); font-size: .9rem; white-space: nowrap; }

/* ---------- Solver ---------- */
.solver-prompt {
  background: var(--bg-input); border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; margin: 14px 0; font-size: 1.02rem; line-height: 1.7; overflow-x: auto;
}
.option-row {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer; margin-bottom: 9px;
  transition: border-color .12s, background .12s;
}
.option-row:hover { border-color: var(--primary); }
.option-row.selected { border-color: var(--primary); background: var(--primary-soft); }
.option-row input { width: auto; }
.step-block { border-left: 3px solid var(--border); padding: 4px 0 4px 16px; margin-bottom: 14px; }
.step-block.done { border-color: var(--accent); }
.step-block.current { border-color: var(--primary); }
.step-block .step-label { font-size: .75rem; color: var(--text-dim); font-weight: 700; text-transform: uppercase; }
.feedback { margin-top: 12px; padding: 12px 16px; border-radius: 10px; font-weight: 600; font-size: .92rem; }
.feedback.ok { background: rgba(16, 185, 129, .14); color: var(--accent); }
.feedback.bad { background: rgba(239, 68, 68, .12); color: var(--danger); }

/* ---------- Progreso / dashboard ---------- */
.stat-card { text-align: center; padding: 18px 12px; }
.stat-card .stat-num { font-size: 1.7rem; font-weight: 800; color: var(--primary); }
.stat-card .stat-label { font-size: .78rem; color: var(--text-dim); margin-top: 3px; }
.level-banner {
  display: flex; align-items: center; gap: 18px;
  background: linear-gradient(120deg, var(--primary-soft), transparent);
}
.level-circle {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: grid; place-items: center; font-size: 1.5rem; font-weight: 800; flex-shrink: 0;
}
.badge-card { text-align: center; padding: 16px 10px; }
.badge-card .badge-icon { font-size: 2rem; }
.badge-card h4 { margin: 8px 0 4px; font-size: .88rem; }
.badge-card p { margin: 0; font-size: .74rem; color: var(--text-dim); }
.badge-card.locked { opacity: .35; filter: grayscale(1); }

/* ---------- Tablas ---------- */
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th { text-align: left; color: var(--text-dim); font-size: .76rem; text-transform: uppercase; letter-spacing: .4px; padding: 9px 12px; border-bottom: 1px solid var(--border); }
td { padding: 11px 12px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr.you td { background: var(--primary-soft); }
.rank-medal { font-size: 1.1rem; }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .55);
  display: grid; place-items: center; z-index: 100; padding: 18px;
  backdrop-filter: blur(3px);
}
.modal {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px;
  width: 100%; max-width: 640px; max-height: 88vh; overflow-y: auto; padding: 24px;
}
.modal h3 { margin-top: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ---------- Toasts ---------- */
#toasts { position: fixed; bottom: 20px; right: 20px; z-index: 200; display: flex; flex-direction: column; gap: 10px; }
.toast {
  background: var(--bg-card); border: 1px solid var(--border); border-left: 4px solid var(--primary);
  border-radius: 10px; padding: 13px 18px; box-shadow: var(--shadow);
  font-size: .9rem; max-width: 330px; animation: slide-in .25s ease;
}
.toast.ok { border-left-color: var(--accent); }
.toast.bad { border-left-color: var(--danger); }
.toast.badge { border-left-color: var(--warning); }
@keyframes slide-in { from { transform: translateX(110%); } to { transform: translateX(0); } }

/* ---------- Gráficas SVG ---------- */
.chart-wrap { overflow-x: auto; }
.chart-bar { fill: var(--primary); }
.chart-axis { stroke: var(--border); }
.chart-label { fill: var(--text-dim); font-size: 10px; }

/* ---------- Builder ---------- */
.builder-section { margin-bottom: 24px; }
.builder-section > h3 { font-size: 1.05rem; margin: 0 0 12px; display: flex; align-items: center; justify-content: space-between; }
.inline-actions { display: flex; gap: 8px; }
.list-row {
  display: flex; align-items: center; gap: 12px; padding: 11px 14px;
  border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px;
}
.list-row .grow { flex: 1; min-width: 0; }
.list-row h5 { margin: 0; font-size: .92rem; }
.list-row p { margin: 2px 0 0; font-size: .78rem; color: var(--text-dim); }
.option-editor-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }

.muted { color: var(--text-dim); font-size: .86rem; }
.mt { margin-top: 16px; }
.mb { margin-bottom: 16px; }
.divider { border: none; border-top: 1px solid var(--border); margin: 18px 0; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  #topbar { padding: 8px 12px; gap: 8px; }
  .brand-text { display: none; }
  #main-nav a { padding: 6px 9px; font-size: .82rem; }
  .user-chip { display: none; }
  #app { padding: 18px 12px 50px; }
  .field-row { flex-direction: column; gap: 0; }
  .module-stats { display: none; }
}

/* KaTeX en tema oscuro hereda el color del texto */
.katex { color: var(--text); }

/* ============ v2: estilo Hack4U / TryHackMe ============ */

/* Chips de metadata */
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .78rem; padding: 4px 11px; border-radius: 20px;
  background: var(--bg-input); border: 1px solid var(--border); color: var(--text-dim);
}
.chip b { color: var(--text); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; }

/* Estrellas */
.stars { color: #f59e0b; letter-spacing: 1px; font-size: .95rem; }
.stars .off { color: var(--border); }
.star-pick { font-size: 1.6rem; cursor: pointer; color: var(--border); transition: color .1s; }
.star-pick.on { color: #f59e0b; }

/* Pestañas */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 18px 0 16px; }
.tabs button {
  background: transparent; border: none; color: var(--text-dim); padding: 10px 16px;
  font-size: .92rem; font-weight: 600; cursor: pointer; border-bottom: 2px solid transparent;
}
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); }
.tabs button:hover { color: var(--text); }

/* Hero del curso */
.course-hero { display: flex; gap: 18px; align-items: flex-start; flex-wrap: wrap; }
.course-hero .hero-icon {
  width: 64px; height: 64px; border-radius: 16px; display: grid; place-items: center;
  color: #fff; font-weight: bold; font-family: Georgia, serif; font-size: 1.6rem; flex-shrink: 0;
}

/* Acordeón de secciones */
.accordion-item { border: 1px solid var(--border); border-radius: 12px; margin-bottom: 10px; overflow: hidden; }
.accordion-head {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px; cursor: pointer;
  background: var(--bg-card); user-select: none;
}
.accordion-head:hover { background: var(--primary-soft); }
.accordion-head .acc-arrow { transition: transform .2s; color: var(--text-dim); }
.accordion-item.open .acc-arrow { transform: rotate(90deg); }
.accordion-body { display: none; border-top: 1px solid var(--border); }
.accordion-item.open .accordion-body { display: block; }
.content-row {
  display: flex; align-items: center; gap: 12px; padding: 11px 16px;
  border-bottom: 1px solid var(--border); cursor: pointer; font-size: .92rem;
}
.content-row:last-child { border-bottom: none; }
.content-row:hover { background: var(--primary-soft); }
.content-row.locked { opacity: .5; cursor: not-allowed; }
.content-row .row-meta { margin-left: auto; display: flex; gap: 10px; align-items: center; color: var(--text-dim); font-size: .78rem; white-space: nowrap; }
.content-row .done-check { color: var(--accent); font-weight: 700; }

/* Feed de actividad */
.feed-item { display: flex; gap: 12px; align-items: flex-start; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: .88rem; }
.feed-item:last-child { border-bottom: none; }
.feed-item .feed-icon { font-size: 1.1rem; }
.feed-item .feed-when { margin-left: auto; color: var(--text-dim); font-size: .74rem; white-space: nowrap; }

/* Dashboard del alumno: curso activo destacado */
.active-course-card {
  border: 2px solid var(--primary); background: linear-gradient(135deg, var(--primary-soft), transparent);
}
.streak-flame { font-size: 1.5rem; }

/* Reseñas */
.review-item { padding: 12px 0; border-bottom: 1px solid var(--border); }
.review-item:last-child { border-bottom: none; }
.review-item .review-head { display: flex; gap: 10px; align-items: center; margin-bottom: 4px; }

/* Contenido de clase */
.lesson-content {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  padding: 26px 28px; line-height: 1.85; font-size: 1rem; white-space: pre-wrap; overflow-x: auto;
}

/* Solicitudes */
.req-status { font-size: .72rem; font-weight: 700; padding: 3px 10px; border-radius: 20px; text-transform: uppercase; }
.req-status.pendiente { background: rgba(245,158,11,.15); color: var(--warning); }
.req-status.aprobada { background: rgba(16,185,129,.15); color: var(--accent); }
.req-status.rechazada { background: rgba(239,68,68,.13); color: var(--danger); }

/* Barra de filtros del catálogo */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.filter-bar input, .filter-bar select { width: auto; flex: 1; min-width: 140px; }

.grade-input { width: 70px !important; text-align: center; }

/* ---------- Video ---------- */
.lesson-video {
  width: 100%; max-height: 460px; background: #000;
  border-radius: 14px; border: 1px solid var(--border); display: block;
}
.video-placeholder {
  display: flex; align-items: center; gap: 12px; justify-content: center;
  background: var(--bg-card); border: 1px dashed var(--border); border-radius: 14px;
  padding: 40px 20px; color: var(--text-dim); font-size: 1.6rem; text-align: center;
}
.video-placeholder span { font-size: .92rem; max-width: 380px; }

/* ---------- Quiz ---------- */
.quiz-row { background: var(--primary-soft); }
.quiz-row b { color: var(--text); }
.section-locked .accordion-head { opacity: .8; }
.section-locked .accordion-head b { color: var(--warning); }
.quiz-q {
  border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; margin-bottom: 12px;
  transition: border-color .15s, background .15s;
}
.quiz-q.q-ok { border-color: var(--accent); background: rgba(16, 185, 129, .08); }
.quiz-q.q-bad { border-color: var(--danger); background: rgba(239, 68, 68, .07); }
.quiz-q .option-row { border: 1px solid var(--border); }

/* ---------- Fase 6: progreso visual ---------- */
.donut-txt { fill: var(--text); font-size: 9px; font-weight: 700; }
.donut circle:last-of-type { transition: stroke-dashoffset .6s ease; }

.streak-cal { display: flex; gap: 10px; }
.sc-day { display: flex; flex-direction: column; align-items: center; gap: 5px; flex: 1; }
.sc-dot {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: var(--bg-input); border: 1px solid var(--border); font-size: .95rem;
}
.sc-dot.on { background: rgba(245, 158, 11, .15); border-color: var(--warning); }
.sc-dot.today { box-shadow: 0 0 0 3px var(--primary-soft); }
.sc-lbl { font-size: .72rem; color: var(--text-dim); font-weight: 600; }

.badge-prog { margin-top: 8px; display: flex; align-items: center; gap: 8px; }
.badge-prog .progress-bar { flex: 1; }
.badge-card.locked.has-prog { opacity: .85; filter: none; }

/* ---------- Fase 6: notas rápidas ---------- */
.notes-panel { margin: 10px 0; padding: 12px; border: 1px dashed var(--border); border-radius: 12px; background: var(--bg-card); }
.notes-panel textarea { margin-top: 4px; }

/* ---------- Fase 6: modo enfoque + Pomodoro ---------- */
body.focus-mode #topbar { display: none !important; }
body.focus-mode .lesson-outline { display: none !important; }
body.focus-mode .lesson-layout { grid-template-columns: 1fr; }
body.focus-mode #app { max-width: 820px; padding-top: 70px; }
.focus-bar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 120;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 10px 18px; background: var(--bg-soft); border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
}
.focus-bar .fb-title { font-weight: 600; max-width: 40%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.focus-bar .fb-mode { font-size: .74rem; text-transform: uppercase; letter-spacing: .5px; padding: 3px 10px; border-radius: 20px; background: var(--primary-soft); color: var(--primary); font-weight: 700; }
.focus-bar .fb-mode.break { background: rgba(16, 185, 129, .15); color: var(--accent); }
.focus-bar .fb-time { font-size: 1.5rem; font-weight: 800; font-variant-numeric: tabular-nums; margin-left: auto; }

/* ---------- Fase 6: foro de dudas ---------- */
.foro-q { margin-bottom: 14px; }
.foro-q.resolved { border-color: var(--accent); }
.foro-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.foro-body { margin: 8px 0; white-space: pre-wrap; line-height: 1.55; }
.foro-replies { margin: 10px 0 10px 14px; border-left: 2px solid var(--border); padding-left: 14px; }
.foro-reply { padding: 8px 0; }
.foro-reply.teacher { background: var(--primary-soft); border-radius: 10px; padding: 10px 12px; margin: 6px 0; border-left: 3px solid var(--primary); }
.foro-replybox { display: flex; gap: 8px; margin-top: 8px; }
.foro-replybox input { flex: 1; }

/* ---------- Landing pública ---------- */
.landing { max-width: 1080px; margin: 0 auto; }
.landing-header {
  display: flex; align-items: center; gap: 18px; padding: 14px 4px; flex-wrap: wrap;
  position: sticky; top: 0; background: var(--bg); z-index: 40; border-bottom: 1px solid var(--border);
}
.landing-nav { display: flex; gap: 6px; flex: 1; flex-wrap: wrap; }
.landing-nav a { color: var(--text-dim); padding: 7px 12px; border-radius: 8px; font-weight: 500; font-size: .92rem; cursor: pointer; }
.landing-nav a:hover { background: var(--primary-soft); color: var(--text); }
.landing-cta { display: flex; align-items: center; gap: 8px; }
.landing-hero {
  display: flex; gap: 28px; align-items: center; padding: 48px 4px; flex-wrap: wrap;
}
.landing-hero .hero-text { flex: 1; min-width: 280px; }
.landing-hero h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 14px; }
.landing-hero h1 b { color: var(--primary); }
.landing-hero p { color: var(--text-dim); font-size: 1.02rem; line-height: 1.6; max-width: 560px; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.hero-art { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hero-badge {
  width: 110px; height: 110px; border-radius: 24px; display: grid; place-items: center;
  font-size: 3rem; background: var(--bg-card); border: 1px solid var(--border); box-shadow: var(--shadow);
}
.hero-art .hero-badge:nth-child(odd) { transform: translateY(-12px); }
.landing-section { padding: 40px 4px; }
.landing-section.alt { background: var(--bg-soft); border-radius: 18px; padding: 36px 24px; }
.landing-section h2 { font-size: 1.5rem; margin: 0 0 6px; }
.feature { text-align: center; }
.feature-ic { font-size: 2rem; }
.feature h4 { margin: 8px 0 6px; }
.landing-footer { text-align: center; color: var(--text-dim); font-size: .82rem; padding: 28px 4px; border-top: 1px solid var(--border); margin-top: 20px; }

/* ---------- Layout de lección con barra lateral (Hack4U) ---------- */
.lesson-layout { display: grid; grid-template-columns: 1fr 320px; gap: 22px; align-items: start; }
.lesson-main { min-width: 0; }
.lesson-outline {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  padding: 12px; position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow-y: auto;
}
.outline-top { padding: 8px 10px 12px; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.outline-section { margin-bottom: 10px; }
.outline-head { font-size: .76rem; text-transform: uppercase; letter-spacing: .4px; color: var(--text-dim); font-weight: 700; padding: 8px 10px 4px; }
.outline-section.locked .outline-head { color: var(--warning); }
.outline-item {
  display: flex; align-items: center; gap: 9px; padding: 8px 10px; border-radius: 8px;
  cursor: pointer; font-size: .86rem; color: var(--text); text-decoration: none;
}
.outline-item .grow { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.outline-item:hover { background: var(--primary-soft); }
.outline-item.current { background: var(--primary-soft); border-left: 3px solid var(--primary); font-weight: 600; }
.outline-item.done .oi-ic { color: var(--accent); }
.outline-item.quiz { background: rgba(99,102,241,.06); }
.outline-item.lk { opacity: .5; cursor: not-allowed; }
.outline-item .oi-ic { width: 18px; text-align: center; }

@media (max-width: 860px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-outline { position: static; max-height: none; order: -1; }
}