/* ============================================
   ESTADÍSTICA ABIERTA — PÁGINA MADRE: MUESTREO
   ============================================ */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding-top: 20px;
  padding-bottom: 16px;
  color: #6b7d96;
  font-size: 0.82rem;
}

.breadcrumb a:hover {
  color: var(--primary);
}

.learning-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  align-items: start;
  gap: 22px;
  padding-bottom: 46px;
}

.learning-main {
  min-width: 0;
}

.lesson-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(250px, 0.6fr);
  align-items: center;
  gap: 24px;
  padding: 28px;
  border: 1px solid #dce9f8;
  border-radius: 18px;
  background:
    radial-gradient(circle at 88% 26%, rgba(111, 177, 255, 0.17), transparent 32%),
    linear-gradient(135deg, #f4f9ff 0%, #eef7ff 100%);
}

.route-label {
  display: inline-flex;
  padding: 6px 11px;
  border-radius: 999px;
  background: #dcecff;
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 800;
}

.lesson-hero h1 {
  margin: 10px 0 2px;
  font-size: clamp(2.8rem, 6vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.lesson-subtitle {
  margin: 0;
  color: #375276;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 650;
}

.lesson-intro {
  max-width: 720px;
  margin: 17px 0 0;
  color: var(--text-2);
  font-size: 0.98rem;
}

.hero-mini-features {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 22px;
  color: #365174;
  font-size: 0.8rem;
  font-weight: 700;
}

.sampling-visual {
  min-height: 200px;
  display: grid;
  grid-template-columns: 1fr auto 0.8fr;
  align-items: center;
  gap: 12px;
}

.population,
.sample {
  text-align: center;
  color: #274467;
  font-size: 0.78rem;
}

.people-grid {
  max-width: 152px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
  margin: 12px auto 0;
}

.people-grid span {
  aspect-ratio: 1;
  border-radius: 50%;
  background: #9bc7f4;
  box-shadow: 0 8px 0 -3px #9bc7f4;
}

.people-grid span.selected {
  background: var(--primary);
  box-shadow: 0 8px 0 -3px var(--primary);
}

.sampling-arrow {
  color: var(--primary);
  font-size: 2rem;
  font-weight: 800;
}

.sample-circle {
  width: 104px;
  height: 104px;
  display: grid;
  grid-template-columns: repeat(2, 20px);
  place-content: center;
  gap: 13px;
  margin: 12px auto 0;
  border: 2px dashed var(--primary);
  border-radius: 50%;
  background: rgba(255,255,255,0.65);
}

.sample-circle span {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 10px 0 -4px var(--primary);
}


/* Sections */

.content-section {
  margin-top: 18px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fff;
}

.section-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.section-title-row > div {
  display: flex;
  align-items: center;
  gap: 11px;
}

.section-number {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
}

.section-number.green {
  background: var(--green);
}

.section-title-row h2 {
  margin: 0;
  font-size: 1.35rem;
}

.section-note {
  color: #718097;
  font-size: 0.74rem;
}

.section-intro-text {
  margin: 12px 0 18px;
  color: var(--text-2);
  font-size: 0.91rem;
}


/* Concepts */

.concept-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.concept-card {
  min-height: 150px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 18px;
  text-align: center;
  border: 1px solid #dde6f1;
  border-radius: 13px;
  background: #fff;
  transition: 0.18s ease;
}

.concept-card:hover {
  transform: translateY(-2px);
  border-color: rgba(11,99,246,0.38);
  box-shadow: 0 9px 25px rgba(14,39,82,0.07);
}

.concept-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 900;
}

.concept-icon.warning {
  color: var(--rose);
  background: var(--rose-soft);
}

.concept-card h3 {
  margin: 12px 0 0;
  font-size: 0.95rem;
}

.concept-card p {
  margin: 6px 0 0;
  color: var(--text-2);
  font-size: 0.78rem;
}

.micro-concepts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  margin-top: 14px;
}

.micro-concepts span {
  padding: 10px 12px;
  border-radius: 10px;
  background: #f7faff;
  color: #52617a;
  font-size: 0.76rem;
}


/* Ads */

.ad-slot {
  margin-top: 18px;
}

.ad-placeholder {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 13px;
  padding: 14px 20px;
  border: 1px dashed #a9bed7;
  border-radius: 13px;
  background: #fbfdff;
  color: #71829a;
  text-align: left;
}

.ad-placeholder strong {
  display: block;
  font-size: 0.8rem;
}

.ad-placeholder small {
  display: block;
  margin-top: 3px;
  font-size: 0.68rem;
}

.ad-icon {
  color: #8ba0bb;
  font-size: 1.5rem;
}


/* Sampling types */

.sampling-types {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.type-panel {
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid #dfe7f1;
}

.type-panel.probabilistic {
  border-color: #cde1fa;
  background: #f8fbff;
}

.type-panel.non-probabilistic {
  border-color: #cdebd9;
  background: #f9fffb;
}

.type-header {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  padding: 16px;
}

.probabilistic .type-header {
  background: #eaf4ff;
}

.non-probabilistic .type-header {
  background: #eaf9f0;
}

.type-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: rgba(255,255,255,0.72);
  color: var(--primary);
  font-weight: 900;
}

.non-probabilistic .type-icon {
  color: var(--green);
}

.type-header h3 {
  margin: 0;
  font-size: 1rem;
}

.type-header p {
  margin: 5px 0 0;
  color: var(--text-2);
  font-size: 0.75rem;
}

.method-list {
  background: #fff;
}

.method-list a {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  align-items: center;
  gap: 9px;
  min-height: 58px;
  padding: 9px 13px;
  border-top: 1px solid #edf1f6;
  transition: 0.16s ease;
}

.method-list a:hover {
  background: #f8fbff;
}

.method-icon {
  color: var(--primary);
  font-weight: 900;
  text-align: center;
}

.non-probabilistic .method-icon {
  color: var(--amber);
}

.method-list strong {
  display: block;
  font-size: 0.8rem;
}

.method-list small {
  display: block;
  margin-top: 2px;
  color: #77859a;
  font-size: 0.67rem;
}

.method-list a > span:last-child {
  color: var(--primary);
  font-weight: 900;
}

.panel-link {
  display: block;
  padding: 12px 14px;
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 800;
  border-top: 1px solid #e4ebf4;
}

.non-probabilistic .panel-link {
  color: var(--green);
}


/* Decision */

.choice-section {
  border-left: 4px solid var(--green);
}

.decision-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.decision-card {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 3px 10px;
  padding: 13px;
  border-radius: 11px;
  background: #f8fbff;
}

.decision-card > span {
  grid-row: 1 / 3;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #e4f4ea;
  color: var(--green);
  font-size: 0.76rem;
  font-weight: 900;
}

.decision-card strong {
  font-size: 0.82rem;
}

.decision-card p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.72rem;
}

.section-cta {
  margin-top: 14px;
}


/* Table */

.comparison-scroll {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 0.77rem;
}

.comparison-table th,
.comparison-table td {
  padding: 11px 12px;
  border-bottom: 1px solid #e6edf5;
  text-align: left;
}

.comparison-table th {
  color: #334a6a;
  background: #f6f9fd;
  font-size: 0.72rem;
}

.comparison-table td:first-child {
  color: var(--text);
  font-weight: 750;
}

.inline-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.78rem;
}


/* Sample size */

.sample-size-box {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 22px;
  padding: 18px;
  border-radius: 13px;
  background: linear-gradient(90deg, #f3f8ff 0%, #fbfdff 100%);
}

.sample-size-box h3 {
  margin: 0;
  font-size: 0.95rem;
}

.sample-size-box p {
  margin: 7px 0 0;
  color: var(--text-2);
  font-size: 0.79rem;
}


/* Practice */

.practice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.practice-grid article {
  padding: 16px;
  border: 1px solid #dfe7f1;
  border-radius: 12px;
}

.practice-icon {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #e7f7ee;
  color: var(--green);
  font-weight: 900;
}

.practice-grid h3 {
  margin: 10px 0 0;
  font-size: 0.9rem;
}

.practice-grid p {
  margin: 5px 0 10px;
  color: var(--text-2);
  font-size: 0.75rem;
}

.practice-grid a {
  color: var(--primary);
  font-size: 0.74rem;
  font-weight: 800;
}


/* Sidebar */

.learning-sidebar {
  position: sticky;
  top: 94px;
  display: grid;
  gap: 14px;
}

.sidebar-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
}

.sidebar-title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
}

.sidebar-title > span {
  color: var(--primary);
  font-weight: 900;
}

.sidebar-title h2,
.action-card h2 {
  margin: 0;
  font-size: 0.94rem;
}

.sidebar-card > strong {
  font-size: 0.77rem;
}

.progress-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 7px;
  color: #718097;
  font-size: 0.68rem;
}

.progress-track {
  height: 7px;
  margin: 8px 0 13px;
  overflow: hidden;
  border-radius: 999px;
  background: #eaf0f7;
}

.progress-fill {
  width: 8%;
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
}

.sidebar-button {
  width: 100%;
  min-height: 40px;
  padding-inline: 12px;
  font-size: 0.76rem;
}

.toc-nav {
  display: grid;
  gap: 4px;
}

.toc-nav a {
  padding: 8px 10px;
  border-radius: 8px;
  color: #425674;
  font-size: 0.74rem;
  transition: 0.16s ease;
}

.toc-nav a:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.action-card {
  background: linear-gradient(180deg, #eef7ff 0%, #f8fbff 100%);
}

.action-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 9px;
  border-radius: 12px;
  background: #dcecff;
  color: var(--primary);
  font-size: 1.25rem;
}

.sidebar-card > p,
.action-card p {
  color: var(--text-2);
  font-size: 0.74rem;
}

.related-links {
  display: grid;
}

.related-links a {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 0;
  border-top: 1px solid #edf1f6;
  color: #476080;
  font-size: 0.74rem;
}

.related-links a:hover {
  color: var(--primary);
}


/* Responsive */

@media (max-width: 1040px) {
  .learning-layout {
    grid-template-columns: 1fr;
  }

  .learning-sidebar {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .lesson-hero {
    grid-template-columns: 1fr;
  }

  .sampling-visual {
    max-width: 420px;
    margin-inline: auto;
  }

  .concept-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sampling-types {
    grid-template-columns: 1fr;
  }

  .practice-grid {
    grid-template-columns: 1fr;
  }

  .sample-size-box {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .breadcrumb {
    padding-top: 14px;
  }

  .lesson-hero {
    padding: 20px;
  }

  .hero-mini-features {
    display: grid;
  }

  .sampling-visual {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .sampling-arrow {
    transform: rotate(90deg);
  }

  .concept-grid,
  .micro-concepts,
  .decision-grid,
  .learning-sidebar {
    grid-template-columns: 1fr;
  }

  .content-section {
    padding: 17px;
  }

  .section-title-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-title-row > div {
    align-items: flex-start;
  }

  .section-note {
    padding-left: 45px;
  }

  .ad-placeholder {
    text-align: center;
    flex-direction: column;
  }
}