/* ==========================================================================
   Componentes · piezas reutilizables del cuaderno
   Sustituye a Radix/shadcn con controles nativos y accesibles.
   ========================================================================== */

/* --- Botones -------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 2.35rem;
  padding: 0 0.95rem;
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
  background: var(--blue-dark);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

.btn:hover { background: #06667f; }
.btn:active { transform: translateY(1px); }

.btn--outline {
  border-color: var(--line);
  background: var(--surface);
  color: var(--forest);
}

.btn--outline:hover { border-color: #079fd380; background: var(--soft-blue); }

.btn--ghost {
  border-color: transparent;
  background: transparent;
  color: var(--text-soft);
}

.btn--ghost:hover { background: var(--surface-sunken); color: var(--forest); }

.btn--secondary {
  background: var(--soft-blue);
  color: var(--blue-deep);
}

.btn--secondary:hover { background: #d6eef5; }

.btn--sm { min-height: 2rem; padding: 0 0.7rem; font-size: var(--text-xs); }
.btn--icon { min-height: 2.35rem; width: 2.35rem; padding: 0; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* Botón dentro del pie oscuro o de tarjetas oscuras. */
.on-dark .btn--outline {
  border-color: #ffffff30;
  background: transparent;
  color: #fff;
}

.on-dark .btn--outline:hover { background: #ffffff12; }

/* --- Campos --------------------------------------------------------------- */

.field {
  display: grid;
  gap: 0.5rem;
  color: #46534d;
  font-size: var(--text-sm);
  font-weight: 700;
}

.input,
.textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  background: var(--surface);
  font-size: var(--text-base);
  font-weight: 400;
  transition: border-color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

.input:focus,
.textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px #079fd329;
}

.textarea { resize: vertical; min-height: 5rem; line-height: 1.6; }

/* --- Casilla de verificación --------------------------------------------- */

.checkbox {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 1.15rem;
  height: 1.15rem;
  border: 1.5px solid #b9c4bd;
  border-radius: 0.35rem;
  background: var(--surface);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
}

.checkbox svg {
  width: 0.8rem;
  height: 0.8rem;
  color: #fff;
  stroke-dasharray: 22;
  stroke-dashoffset: 22;
  transition: stroke-dashoffset var(--dur-base) var(--ease-out);
}

.checkbox[aria-checked="true"] {
  border-color: var(--green-dark);
  background: var(--green-dark);
}

.checkbox[aria-checked="true"] svg { stroke-dashoffset: 0; }

/* --- Barra de progreso ---------------------------------------------------- */

.progress {
  overflow: hidden;
  height: 0.5rem;
  border-radius: var(--radius-pill);
  background: #ffffff1f;
}

.progress--light { background: var(--surface-sunken); }

.progress__bar {
  height: 100%;
  border-radius: inherit;
  background: var(--green);
  transition: width var(--dur-slow) var(--ease-out);
}

/* --- Píldoras y rótulos --------------------------------------------------- */

.eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--blue-dark);
  font-size: var(--text-xs);
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.35rem 0.52rem;
  border-radius: var(--radius-pill);
  background: var(--surface-sunken);
  color: #6d7973;
  font-size: 0.61rem;
  font-weight: 750;
}

.status-pill--open { background: #eaf5da; color: var(--green-dark); }

.section-heading { margin-bottom: 1.6rem; }

.section-heading h2 {
  max-width: 52rem;
  margin: 0.55rem 0 0.45rem;
  font-size: var(--text-xl);
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.section-heading p {
  max-width: 49rem;
  color: var(--text-soft);
  line-height: 1.65;
}

.section-heading--compact h2 { font-size: clamp(1.45rem, 2.4vw, 2rem); }

/* --- Superficies base ----------------------------------------------------- */

.work-card,
.prompt-builder,
.agenda,
.review-card,
.security-note {
  padding: clamp(1.4rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.dashboard-hero,
.session-hero,
.page-intro,
.locked-view {
  position: relative;
  overflow: hidden;
  border: 1px solid #079fd329;
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}

.dashboard-hero::before,
.page-intro::before,
.session-hero::before {
  content: "";
  position: absolute;
  top: -9rem;
  right: -9rem;
  width: 20rem;
  height: 20rem;
  border: 4rem solid #079fd30f;
  border-radius: 50%;
}

.dashboard-hero > *,
.session-hero > *,
.page-intro > * { position: relative; z-index: 1; }

/* --- Portada del panel ---------------------------------------------------- */

.dashboard-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
  gap: var(--space-6);
  padding: clamp(2rem, 5vw, 5.4rem);
}

.dashboard-hero h1,
.page-intro h1,
.session-hero h1,
.locked-view h1 {
  margin: 0.75rem 0 1rem;
  color: var(--forest);
  font-size: var(--text-display);
  font-weight: 820;
  letter-spacing: -0.065em;
  line-height: 0.97;
}

.dashboard-hero__copy > p,
.page-intro > p,
.session-hero > div > p,
.locked-view > p {
  max-width: 48rem;
  color: #586760;
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: var(--space-6);
}

.next-session-card {
  position: relative;
  z-index: 1;
  align-self: stretch;
  padding: 1.5rem;
  border-radius: 1.25rem;
  background: var(--forest);
  color: #fff;
  box-shadow: var(--shadow-forest);
}

.next-session-card__head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #a7d5e3;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.next-session-card > strong {
  display: block;
  margin-top: 2.6rem;
  color: var(--green-light);
  font-size: 0.82rem;
}

.next-session-card h2 { margin: 0.45rem 0 1.4rem; color: #fff; font-size: 1.45rem; line-height: 1.2; }

.countdown {
  padding: 1rem;
  border: 1px solid #ffffff1f;
  border-radius: var(--radius-sm);
  background: #ffffff0f;
  font-size: 1.8rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.next-session-card small { display: block; margin-top: 0.7rem; color: #ffffff8a; }

/* --- Métricas ------------------------------------------------------------- */

.metric-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  margin: 1.25rem 0 var(--space-7);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
}

.metric-row article {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 1.25rem;
  background: #ffffffe6;
}

.metric-row strong { color: var(--blue-dark); font-size: 1.65rem; }
.metric-row span { color: #64716b; font-size: 0.77rem; }

@media (width <= 820px) { .metric-row { grid-template-columns: repeat(2, 1fr); } }
@media (width <= 580px) {
  .metric-row { grid-template-columns: 1fr; }
  .metric-row article { padding: 0.9rem; }
}

/* --- Ficha de perfil ------------------------------------------------------ */

.profile-card {
  margin-bottom: var(--space-7);
  border-left: 5px solid var(--green);
}

/* --- Tarjetas de sesión --------------------------------------------------- */

.session-card {
  display: flex;
  flex-direction: column;
  min-height: 22rem;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: var(--surface);
  transition: transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
}

.session-card:hover {
  border-color: #079fd380;
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.session-card--locked { background: #ffffff94; }

.session-card__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.session-number { color: #a6b1ab; font-family: var(--font-mono); font-size: 0.76rem; }

.session-icon {
  display: grid;
  place-items: center;
  width: 3.1rem;
  height: 3.1rem;
  margin: var(--space-6) 0 1.2rem;
  border-radius: 1rem;
  background: var(--soft-blue);
  color: var(--blue-dark);
}

.session-card time { color: var(--red); font-size: 0.67rem; font-weight: 800; text-transform: uppercase; }
.session-card h3 { margin: 0.55rem 0; font-size: 1.12rem; line-height: 1.18; }
.session-card p { color: #67736e; font-size: var(--text-sm); line-height: 1.55; }

.session-card__cta {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: auto;
  color: var(--blue-dark);
  font-size: 0.72rem;
  font-weight: 800;
}

/* --- Productos acumulativos ---------------------------------------------- */

.outputs-grid article {
  position: relative;
  display: grid;
  align-content: end;
  gap: 0.5rem;
  overflow: hidden;
  min-height: 9rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
}

.outputs-grid article > span {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  color: var(--line-soft);
  font-size: 2.8rem;
  font-weight: 900;
}

.outputs-grid .icon { color: var(--green); }

/* --- Principios ----------------------------------------------------------- */

.principle-card { padding: var(--space-6); border-radius: 1.2rem; }
.principle-card h2 { margin: 1.3rem 0 0.5rem; font-size: 1.35rem; }
.principle-card p { color: #4e5e57; line-height: 1.65; }
.principle-card--blue { background: var(--soft-blue); color: var(--blue-deep); }
.principle-card--green { background: var(--soft-green); color: var(--green-dark); }
.principle-card--blue h2 { color: var(--blue-deep); }
.principle-card--green h2 { color: var(--green-dark); }

/* --- Herramientas --------------------------------------------------------- */

.page-intro { padding: clamp(2.2rem, 5vw, 5rem); }
.page-intro h1 { font-size: clamp(2.5rem, 5vw, 4.6rem); }

.tools-grid a {
  display: flex;
  flex-direction: column;
  min-height: 13rem;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  transition: transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

.tools-grid a:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.tools-grid .icon { color: var(--blue-dark); }
.tools-grid h2 { margin: 1.2rem 0 0.4rem; font-size: 1.1rem; }
.tools-grid p { color: #65726c; font-size: 0.82rem; line-height: 1.6; }

.tools-grid a > span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: auto;
  color: var(--blue-dark);
  font-size: 0.72rem;
  font-weight: 800;
}

/* --- Constructor de prompts ----------------------------------------------- */

.prompt-builder { margin-bottom: 1.2rem; }

.prompt-builder__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(22rem, 1.15fr);
  gap: var(--space-4);
}

.prompt-builder__fields { display: grid; gap: 0.85rem; }

.prompt-preview {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.2rem;
  border-radius: 1rem;
  background: var(--forest);
  color: var(--on-dark);
}

.prompt-preview__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
  color: var(--green-light);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
}

.prompt-preview pre,
.prompt-details pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.prompt-preview pre { overflow: auto; }

@media (width <= 820px) { .prompt-builder__grid { grid-template-columns: 1fr; } }
@media (width <= 580px) {
  .prompt-builder__grid { display: block; }
  .prompt-preview { margin-top: 1rem; }
}

/* --- Nota de seguridad ---------------------------------------------------- */

.security-note {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  border-left: 5px solid var(--red);
}

.security-note > .icon { flex: none; color: var(--red); }
.security-note h2 { margin-bottom: 0.35rem; font-size: 1.1rem; }
.security-note p { color: #5f6b65; line-height: 1.65; }

/* --- Portada de sesión ---------------------------------------------------- */

.session-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(17rem, 0.7fr);
  gap: var(--space-6);
  padding: clamp(2rem, 5vw, 4.5rem);
}

.breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: var(--space-6);
  color: #6b7771;
  font-size: 0.74rem;
  font-weight: 750;
}

.session-hero h1 {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: clamp(2.4rem, 5vw, 4.5rem);
}

.session-hero h1 > span {
  display: grid;
  place-items: center;
  flex: none;
  width: 3.3rem;
  height: 3.3rem;
  border-radius: 1rem;
  background: var(--blue);
  color: #fff;
}

.session-tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1.5rem; }

.session-tags span {
  padding: 0.38rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: #fafbf9;
  color: #4f5d56;
  font-size: 0.68rem;
  font-weight: 750;
}

.product-card {
  position: relative;
  z-index: 1;
  align-self: end;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #f8faf7;
}

.product-card > span {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--blue-dark);
  font-size: var(--text-xs);
  font-weight: 800;
  text-transform: uppercase;
}

.product-card > strong { display: block; margin: 1rem 0 1.6rem; font-size: 1.25rem; line-height: 1.3; }
.product-card__meter small { display: block; margin: 0.5rem 0 1rem; color: #6d7973; font-size: var(--text-xs); }
.product-card__actions { display: grid; gap: 0.5rem; }

@media (width <= 820px) { .session-hero { grid-template-columns: 1fr; } }
@media (width <= 580px) {
  .dashboard-hero,
  .page-intro,
  .session-hero { border-radius: 1.2rem; padding: 1.45rem; }
  .dashboard-hero,
  .prompt-builder__grid { grid-template-columns: 1fr; }
  .dashboard-hero h1,
  .page-intro h1,
  .session-hero h1,
  .locked-view h1 { font-size: 2.5rem; }
  .session-hero h1 { flex-direction: column; align-items: flex-start; }
}

@media (width <= 820px) { .dashboard-hero { grid-template-columns: 1fr; } }

/* --- Agenda --------------------------------------------------------------- */

.agenda { margin: 1.2rem 0 var(--space-8); }
.agenda-grid > article { overflow: hidden; border: 1px solid var(--line); border-radius: 1rem; }

.agenda-block-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: var(--forest);
  color: #fff;
}

.agenda-block-title span {
  color: var(--green-light);
  font-size: var(--text-2xs);
  font-weight: 800;
  text-transform: uppercase;
}

.agenda-block-title strong { font-size: 0.85rem; }

.agenda-list > div {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 0.8rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--line-soft);
}

.agenda-list time { color: var(--blue-dark); font-family: var(--font-mono); font-size: 0.69rem; }
.agenda-list span,
.agenda-list small { display: block; }
.agenda-list strong { font-size: var(--text-sm); }
.agenda-list small { margin-top: 0.2rem; color: #78837e; font-size: 0.68rem; }

/* --- Tarjeta de actividad ------------------------------------------------- */

.activity-card {
  position: relative;
  display: grid;
  grid-template-columns: 4.3rem minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: var(--surface);
  box-shadow: 0 12px 40px #142c240b;
}

.activity-card--deep { border-color: #80bf2359; }

.activity-card__number {
  display: grid;
  justify-content: center;
  padding-top: 1.7rem;
  background: var(--blue-dark);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
}

.activity-card--deep .activity-card__number { background: var(--green); color: #28440a; }

.activity-card__content { min-width: 0; padding: clamp(1.3rem, 3vw, 2rem); }

.activity-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.activity-card__head > div > span {
  color: var(--blue-dark);
  font-size: var(--text-2xs);
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.activity-card__head h2 {
  margin-top: 0.35rem;
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  letter-spacing: -0.035em;
}

.completion-control {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex: none;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 750;
  cursor: pointer;
}

.activity-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 1.4rem 0;
}

.activity-meta p {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.85rem;
  border-radius: 0.8rem;
  background: var(--surface-muted);
}

.activity-meta .icon { flex: none; color: var(--blue-dark); }
.activity-meta span,
.activity-meta strong { display: block; }
.activity-meta span { color: var(--text-muted); font-size: 0.76rem; line-height: 1.55; }
.activity-meta strong { margin-bottom: 0.15rem; color: #26342e; }

.prompt-details {
  overflow: hidden;
  margin: 1.2rem 0;
  border: 1px solid #cfe5ec;
  border-radius: var(--radius-sm);
  background: #f5fbfd;
}

.prompt-details summary {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.95rem 1rem;
  color: var(--blue-deep);
  font-size: var(--text-sm);
  font-weight: 800;
  list-style: none;
  cursor: pointer;
}

.prompt-details summary::-webkit-details-marker { display: none; }

.prompt-details summary .chevron {
  margin-left: auto;
  transition: transform var(--dur-fast) var(--ease-out);
}

.prompt-details[open] summary .chevron { transform: rotate(90deg); }

.prompt-details__body { padding: 0 1rem 1rem; }

.prompt-details__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: 0.8rem;
  color: var(--text-soft);
  font-size: 0.69rem;
}

.prompt-details pre {
  max-height: 30rem;
  padding: 1rem;
  overflow: auto;
  border-radius: var(--radius-xs);
  background: var(--forest);
  color: var(--on-dark);
}

.activity-notes { display: grid; gap: 0.5rem; color: #46534d; font-size: var(--text-sm); font-weight: 750; }

.activity-notes textarea {
  min-height: 9rem;
  background: repeating-linear-gradient(#fff 0 2.12rem, #e6ebe7 2.16rem);
  line-height: 2.16rem;
}

.activity-notes small { color: var(--text-faint); font-size: var(--text-2xs); font-weight: 500; }

@media (width <= 820px) { .activity-meta { grid-template-columns: 1fr; } }
@media (width <= 580px) {
  .activity-card { grid-template-columns: 2.5rem minmax(0, 1fr); }
  .activity-card__number { font-size: 0.68rem; }
  .activity-card__head,
  .prompt-details__toolbar { flex-direction: column; align-items: flex-start; }
  .completion-control { align-self: flex-start; }
}

/* --- Revisión final ------------------------------------------------------- */

.review-card { margin-top: var(--space-4); border-left: 5px solid var(--green); }

.review-list label {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.8rem;
  border-radius: 0.75rem;
  background: var(--surface-muted);
  font-size: var(--text-sm);
  line-height: 1.5;
  cursor: pointer;
}

.session-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: 1.5rem;
}

@media (width <= 580px) { .session-pagination { flex-direction: column; align-items: stretch; } }

/* --- Vista bloqueada ------------------------------------------------------ */

.locked-view {
  display: grid;
  justify-items: center;
  padding: clamp(3rem, 8vw, 8rem) 1.5rem;
  text-align: center;
}

.locked-view__icon {
  display: grid;
  place-items: center;
  width: 4.5rem;
  height: 4.5rem;
  margin-bottom: 1.5rem;
  border-radius: 1.3rem;
  background: var(--soft-blue);
  color: var(--blue-dark);
}

.locked-view h1 { max-width: 50rem; font-size: clamp(2.5rem, 6vw, 4.7rem); }

.locked-countdown {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-width: 16rem;
  margin: 1.5rem 0 0.6rem;
  padding: 1rem 1.2rem;
  border-radius: 1rem;
  background: var(--forest);
  color: #fff;
  text-align: left;
}

.locked-countdown > .icon { color: var(--green-light); }
.locked-countdown span,
.locked-countdown strong { display: block; }
.locked-countdown span { color: var(--on-dark-muted); font-size: 0.68rem; }
.locked-countdown strong { font-variant-numeric: tabular-nums; }

.locked-view__note { margin: 0 0 1.5rem; font-size: 0.75rem; color: var(--text-soft); }
.locked-view__actions { display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; }

.not-found-view {
  display: grid;
  place-items: center;
  align-content: center;
  gap: var(--space-4);
  min-height: 50vh;
  text-align: center;
}

/* --- Modo facilitador ----------------------------------------------------- */

.unlock-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0.6rem clamp(1rem, 3vw, 2.5rem);
  background: var(--green-dark);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 700;
}

.unlock-banner__text { display: flex; align-items: center; gap: 0.5rem; }

.unlock-banner .btn {
  min-height: 1.9rem;
  padding: 0 0.7rem;
  border-color: #ffffff4d;
  background: transparent;
  color: #fff;
  font-size: var(--text-xs);
}

.unlock-banner .btn:hover { background: #ffffff1f; }

@media (width <= 580px) {
  .unlock-banner { flex-direction: column; align-items: flex-start; }
}

/* --- Diálogo -------------------------------------------------------------- */

.dialog {
  width: min(26rem, calc(100vw - 2rem));
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}

.dialog::backdrop { background: #10241f8f; }

.dialog__body { padding: 1.6rem; }
.dialog__body h2 { font-size: 1.25rem; }
.dialog__body > p { margin: 0.5rem 0 1.2rem; color: var(--text-soft); font-size: var(--text-base); line-height: 1.6; }
.dialog__actions { display: flex; justify-content: flex-end; gap: 0.5rem; margin-top: 1.2rem; }

.dialog__note {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  color: var(--text-faint);
  font-size: var(--text-2xs);
  line-height: 1.6;
}

.dialog__error {
  display: none;
  margin-top: 0.5rem;
  color: var(--red);
  font-size: var(--text-xs);
  font-weight: 700;
}

.dialog[data-error="true"] .dialog__error { display: block; }

/* --- Menú de descargas ---------------------------------------------------- */

.menu { position: relative; }

.menu__panel {
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 0;
  z-index: 40;
  display: grid;
  gap: 0.15rem;
  width: 17rem;
  padding: 0.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}

.menu__panel[hidden] { display: none; }

.menu__item {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  padding: 0.55rem 0.6rem;
  border: 0;
  border-radius: var(--radius-xs);
  background: transparent;
  color: var(--forest);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out);
}

.menu__item:hover { background: var(--surface-muted); }
.menu__item .icon { flex: none; color: var(--blue-dark); }
.menu__separator { height: 1px; margin: 0.3rem 0; background: var(--line-soft); }

.menu__label {
  padding: 0.5rem 0.6rem 0.25rem;
  color: var(--text-faint);
  font-size: var(--text-2xs);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Avisos --------------------------------------------------------------- */

.toast-region {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 90;
  display: grid;
  gap: 0.5rem;
  width: min(22rem, calc(100vw - 2rem));
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  background: var(--surface);
  color: var(--forest);
  font-size: var(--text-sm);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
}

.toast .icon { flex: none; }
.toast--success .icon { color: var(--green-dark); }
.toast--error { border-color: #f0c3c1; }
.toast--error .icon { color: var(--red); }
.toast--info .icon { color: var(--blue-dark); }

/* --- Iconos --------------------------------------------------------------- */

.icon {
  width: 1.1em;
  height: 1.1em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon--lg { width: 1.5rem; height: 1.5rem; }

/* ==========================================================================
   Material de estudio
   Encuadre, conceptos, paso a paso, ejemplo trabajado, consejos y errores.
   ========================================================================== */

/* --- Guía de la sesión ---------------------------------------------------- */

.study {
  margin: var(--space-6) 0 var(--space-7);
  padding: clamp(1.4rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-left: 5px solid var(--blue);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.study__intro {
  max-width: 62ch;
  margin-bottom: var(--space-5);
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.75;
}

.study__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.study__block h3 {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.9rem;
  color: var(--blue-dark);
  font-size: var(--text-xs);
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.study__list { display: grid; gap: 0.6rem; }

.study__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.study__list .icon { flex: none; margin-top: 0.2rem; color: var(--green-dark); }

/* --- Conceptos ------------------------------------------------------------ */

.concepts { margin: var(--space-7) 0; }

.concepts__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.concept {
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

.concept:hover { border-color: #079fd380; box-shadow: var(--shadow-sm); }

.concept h3 {
  margin-bottom: 0.5rem;
  color: var(--forest);
  font-size: 1.05rem;
}

.concept p { color: var(--text-muted); font-size: 0.86rem; line-height: 1.65; }

.concept__example {
  margin-top: 0.8rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-xs);
  background: var(--soft-blue);
  color: var(--blue-deep) !important;
  font-size: 0.82rem !important;
}

.concept__example strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: var(--text-2xs);
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Paso a paso ---------------------------------------------------------- */

.steps {
  margin: 1.4rem 0;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
}

.steps__title,
.worked__title,
.tips__title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.9rem;
  color: var(--blue-dark);
  font-size: var(--text-xs);
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.steps__list {
  display: grid;
  gap: 0.85rem;
  counter-reset: paso;
  list-style: none;
}

.steps__list li {
  display: grid;
  gap: 0.15rem;
  padding-left: 2.2rem;
  position: relative;
}

.steps__list li::before {
  counter-increment: paso;
  content: counter(paso);
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--blue-dark);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
}

.activity-card--deep .steps__list li::before { background: var(--green-dark); }

.steps__list strong { color: var(--forest); font-size: 0.9rem; }
.steps__list span { color: var(--text-muted); font-size: 0.84rem; line-height: 1.6; }

/* --- Ejemplo trabajado ---------------------------------------------------- */

.worked {
  margin: 1.4rem 0;
  padding: 1.2rem 1.3rem;
  border: 1px dashed #b6d9c4;
  border-radius: var(--radius-md);
  background: var(--soft-green);
}

.worked__title { color: var(--green-dark); }

.worked__context {
  margin-bottom: 0.85rem;
  color: var(--green-dark);
  font-size: 0.82rem;
  font-style: italic;
}

.worked__pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.worked__pair > div {
  padding: 0.85rem;
  border-radius: var(--radius-xs);
  background: #ffffffcc;
}

.worked__pair span {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--text-faint);
  font-size: var(--text-2xs);
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.worked__pair p { color: var(--text); font-size: 0.84rem; line-height: 1.6; }
.worked__out { border-left: 3px solid var(--green); }

/* --- Consejos ------------------------------------------------------------- */

.tips { margin: 1.4rem 0; }
.tips__title { color: var(--text-soft); }

.tips ul { display: grid; gap: 0.45rem; }

.tips li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--text-muted);
  font-size: 0.84rem;
  line-height: 1.6;
}

.tips li::before {
  content: "";
  position: absolute;
  top: 0.55rem;
  left: 0;
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 50%;
  background: var(--blue);
}

/* --- Criterio de calidad -------------------------------------------------- */

.criterion {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin-top: 1.2rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-xs);
  background: var(--soft-blue);
  color: var(--blue-deep);
  font-size: 0.85rem;
  line-height: 1.6;
}

.criterion .icon { flex: none; margin-top: 0.1rem; }
.criterion strong { display: block; }

/* --- Errores frecuentes --------------------------------------------------- */

.pitfalls { margin: var(--space-7) 0; }
.pitfalls__list { display: grid; gap: 0.7rem; }

.pitfall {
  display: grid;
  gap: 0.5rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.pitfall p {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.87rem;
  line-height: 1.6;
}

.pitfall .icon { flex: none; margin-top: 0.15rem; }
.pitfall__error { color: var(--forest); font-weight: 700; }
.pitfall__error .icon { color: var(--red); }
.pitfall__fix { color: var(--text-muted); }
.pitfall__fix .icon { color: var(--green-dark); }

/* --- Hasta la próxima sesión ---------------------------------------------- */

.homework {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin: var(--space-7) 0 var(--space-6);
  padding: clamp(1.4rem, 3vw, 2rem);
  border-radius: var(--radius-lg);
  background: var(--forest);
  color: var(--on-dark);
}

.homework__icon {
  display: grid;
  place-items: center;
  flex: none;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-sm);
  background: #ffffff14;
  color: var(--green-light);
}

.homework h2 { margin-bottom: 0.4rem; color: #fff; font-size: 1.2rem; }
.homework p { color: #c9d8d1; font-size: 0.92rem; line-height: 1.7; }

/* --- Adaptación ----------------------------------------------------------- */

@media (width <= 820px) {
  .study__cols,
  .concepts__grid,
  .worked__pair { grid-template-columns: 1fr; }
}

@media (width <= 580px) {
  .steps__list li { padding-left: 1.9rem; }
  .homework { flex-direction: column; }
}