.join { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1rem; padding: 1rem; }
.practice-link { width: min(28rem, 100%); display: flex; gap: 1rem; align-items: center; text-decoration: none; color: var(--text); padding: 1rem 1.25rem; margin: 0; }
.practice-link:hover { border-color: var(--primary); }
.practice-ic { width: 2.4rem; height: 2.4rem; border-radius: 50%; background: var(--primary-soft); color: var(--primary); display: grid; place-items: center; font-size: 1.2rem; flex: none; }
.join-card { width: min(28rem, 100%); padding: 2rem; }
.join-card input#join-code { font-family: var(--mono); font-size: 1.6rem; letter-spacing: .25em; text-transform: uppercase; text-align: center; }
.brand { font-family: var(--mono); color: var(--primary); font-weight: 700; margin-bottom: 1rem; }
.brand-sm { font-family: var(--mono); background: var(--primary); color: #fff; border-radius: 8px; padding: .15rem .45rem; font-weight: 700; }

.topbar { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .6rem 1rem; background: var(--surface); border-bottom: 1px solid var(--line); }
.tb-left { display: flex; gap: .75rem; align-items: center; min-width: 0; }
.tb-title { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb-right { display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.timer { font-family: var(--mono); font-size: .95rem; background: var(--primary-soft); color: var(--primary); }
.timer.over { background: var(--warn-soft); color: var(--warn); }
#help-btn.active { background: #FCE7F3; border-color: #DB2777; color: #9D174D; }

.broadcast { background: var(--concept-soft); color: #1E3A8A; border-bottom: 1px solid #C7D8FB; padding: .6rem 1rem; font-weight: 700; }
.broadcast::before { content: '💡 Pista para todo el grupo: '; }

.layout { display: grid; grid-template-columns: 15rem 1fr; min-height: calc(100vh - 56px); }
.nav { border-right: 1px solid var(--line); padding: 1rem .6rem; background: var(--surface); }
.nav h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 0 .5rem; }
.nav ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.nav button { width: 100%; justify-content: flex-start; border: 0; background: transparent; font-weight: 400; padding: .45rem .5rem; text-align: left; border-radius: 8px; }
.nav button[aria-current="true"] { background: var(--primary-soft); color: var(--primary); font-weight: 700; }
.nav button .st { width: 1.2rem; text-align: center; flex: none; }
.nav button .lb { font-size: .75rem; color: var(--muted); display: block; }
.nav .note { font-size: .8rem; color: var(--muted); padding: .5rem; }

.stage { padding: 1.5rem clamp(1rem, 3vw, 2.5rem) 4rem; max-width: 1400px; width: 100%; }
.stage:focus { outline: none; }
.act-head { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; margin-bottom: .4rem; }
.act-title { font-size: 1.7rem; margin: .2rem 0 .4rem; }
.act-prompt { font-size: 1.1rem; color: var(--text-2); max-width: 60rem; }

.two-col { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 1rem; align-items: start; }
.stack > * + * { margin-top: 1rem; }

/* Predicción */
.options { display: grid; gap: .6rem; margin-top: 1rem; max-width: 46rem; }
.opt { justify-content: flex-start; text-align: left; font-weight: 400; padding: .9rem 1rem; font-size: 1.05rem; border-width: 2px; position: relative; }
.opt .k { font-family: var(--mono); font-weight: 700; background: var(--surface-2); border-radius: 6px; padding: 0 .45rem; }
.opt[aria-pressed="true"] { border-color: var(--primary); background: var(--primary-soft); }
.opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.correct::after { content: '✓ Correcto'; margin-left: auto; color: var(--ok); font-weight: 700; }
.opt.wrong-mine::after { content: '✗ Tu voto'; margin-left: auto; color: var(--err); font-weight: 700; }
.round-banner { display: inline-flex; gap: .5rem; align-items: center; font-weight: 700; margin-top: .8rem; }

/* Preguntas */
.q { border: 1px solid var(--line); border-radius: 10px; padding: .9rem 1rem; background: var(--surface); }
.q + .q { margin-top: .75rem; }
.q-prompt { font-weight: 700; margin-bottom: .5rem; }
.q .choices { display: flex; gap: .5rem; flex-wrap: wrap; }
.q .choices button { font-weight: 400; }
.q .choices button[aria-pressed="true"] { border-color: var(--primary); background: var(--primary-soft); font-weight: 700; }
.q .row { display: flex; gap: .5rem; }
.q .row input { flex: 1; }
.q .sent { list-style: none; padding: 0; margin: .5rem 0 0; display: grid; gap: .3rem; }
.q .sent li { background: var(--surface-2); border-radius: 8px; padding: .35rem .6rem; font-size: .9rem; }
.q-fb { margin-top: .5rem; font-weight: 700; }
.q-fb.ok { color: var(--ok); } .q-fb.err { color: var(--err); } .q-fb.info { color: var(--text-2); }
.q-fb .expl { font-weight: 400; color: var(--text-2); display: block; }

/* Editor */
.task-tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .8rem; }
.task-tabs button[aria-selected="true"] { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.task-tabs .ok { color: var(--ok); }
.editor-card.ai { border: 2px solid var(--ai); }
.editor-card.ai.verified { border-color: var(--ok); }
.ai-label { background: var(--ai); color: #fff; font-weight: 700; padding: .3rem .8rem; border-radius: 8px 8px 0 0; display: inline-block; font-size: .9rem; }
.editor-host { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; min-height: 180px; background: #fff; }
.editor-host textarea.fallback { font-family: var(--mono); font-size: var(--code-size); line-height: 1.6; border: 0; border-radius: 0; min-height: 260px; tab-size: 4; white-space: pre; }
.toolbar { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .75rem; align-items: center; }
.toolbar .sp { flex: 1; }
.err-box .where { font-family: var(--mono); font-size: .9rem; }
.hints { margin-top: .75rem; display: grid; gap: .4rem; }
.hints .hint { background: #FFFBEB; border: 1px solid #F3D9B1; border-radius: 8px; padding: .5rem .75rem; font-size: .95rem; }
.hints .hint b { color: var(--warn); }
.final-vars { margin-top: .75rem; }

/* Traza */
.trace-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr) minmax(0, .8fr); gap: .8rem; margin-top: .8rem; align-items: start; }
.trace-grid .card { padding: .8rem; }
.trace-grid h3 { font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.trace-desc { margin-top: .6rem; }

/* Parsons */
.parsons { display: grid; grid-template-columns: 1fr 1.3fr; gap: 1rem; margin-top: 1rem; }
.pz { background: var(--surface-2); border: 2px dashed var(--line); border-radius: 12px; padding: .7rem; min-height: 12rem; }
.pz.target { background: #fff; border-style: solid; }
.pz.drag-over { border-color: var(--primary); }
.pz h3 { font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.pb { display: flex; align-items: center; gap: .4rem; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--concept); border-radius: 8px; padding: .35rem .5rem; margin-bottom: .4rem; font-family: var(--mono); font-size: var(--code-size); cursor: grab; transition: margin-left .2s; }
.pb .txt { flex: 1; white-space: pre; overflow-x: auto; }
.pb .ctl { display: flex; gap: .2rem; font-family: var(--font); }
.pb .ctl button { padding: .15rem .45rem; font-size: .85rem; }
.pb.dragging { opacity: .4; }

/* Auditoría */
.audit-table { width: 100%; border-collapse: collapse; margin-top: .6rem; }
.audit-table th, .audit-table td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); font-size: .95rem; }
.audit-table td.mono { font-family: var(--mono); }
.audit-form { display: grid; grid-template-columns: 2fr 1fr auto; gap: .5rem; align-items: end; margin-top: .6rem; }

/* Escape */
.lockmap { display: flex; align-items: center; gap: 0; margin: 1rem 0; flex-wrap: wrap; }
.lockmap .node { display: flex; flex-direction: column; align-items: center; gap: .2rem; min-width: 5.5rem; }
.lockmap .node .c { width: 3rem; height: 3rem; border-radius: 50%; display: grid; place-items: center; font-size: 1.3rem; background: var(--surface-2); border: 3px solid #C3C9DA; }
.lockmap .node.open .c { background: var(--ok-soft); border-color: var(--ok); }
.lockmap .node .t { font-size: .8rem; color: var(--text-2); }
.lockmap .node.open .t { color: var(--ok); font-weight: 700; }
.lockmap .edge { flex: 1; min-width: 1.5rem; height: 3px; background: #C3C9DA; margin-bottom: 1.4rem; }
.lockmap .edge.open { background: var(--ok); }
.locks { display: grid; grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr)); gap: 1rem; }
.lock.open { border-color: #B7DEC3; }
.digit { font-family: var(--mono); font-size: 1.4rem; width: 4.5rem !important; text-align: center; }
.final-key { font-family: var(--mono); font-size: 1.6rem; letter-spacing: .4em; width: 10rem !important; text-align: center; }

/* Sala de espera */
.waiting { max-width: 44rem; }
.checklist { list-style: none; padding: 0; display: grid; gap: .5rem; }
.checklist li { display: flex; gap: .6rem; align-items: center; }

.overlay { position: fixed; inset: 0; background: rgba(23, 32, 51, .55); display: grid; place-items: center; z-index: 500; padding: 1rem; }
.overlay .card { text-align: center; max-width: 26rem; }
dialog { border: 0; border-radius: 14px; padding: 1.5rem; width: min(32rem, 92vw); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(23, 32, 51, .45); }

@media (max-width: 1100px) {
  .trace-grid { grid-template-columns: 1fr 1fr; }
  .trace-grid .trace-out { grid-column: span 2; }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .nav { display: none; border-right: 0; border-bottom: 1px solid var(--line); }
  .nav.open { display: block; }
  .two-col, .parsons, .trace-grid { grid-template-columns: 1fr; }
  .trace-grid .trace-out { grid-column: auto; }
  #me { display: none; }
  .audit-form { grid-template-columns: 1fr; }
}
@media (min-width: 901px) { #menu-btn { display: none; } }