:root {
  /* Alineado con la paleta de stl-eduPreC */
  --epc-bg: #000000;
  --epc-surface: #101010;
  --epc-border-subtle: rgba(148, 163, 184, 0.4);
  --epc-primary: #3B82F6;
  --epc-primary-dark: #22D3EE;
  --epc-accent: #22D3EE;
  --epc-text-main: #E5E7EB;
  --epc-text-muted: #A1A1AA;
  --epc-success: #22c55e;
  --epc-warn: #facc15;
  --epc-danger: #f97373;
  --epc-radius-lg: 14px;
  --epc-radius-md: 10px;
  --epc-radius-pill: 999px;
  --epc-shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.7);
  --epc-shadow-subtle: 0 6px 16px rgba(0, 0, 0, 0.55);
  --epc-page-max-width: 980px;
  --epc-spacing-xs: 0.4rem;
  --epc-spacing-sm: 0.75rem;
  --epc-spacing-md: 1.25rem;
  --epc-spacing-lg: 2rem;
  --epc-spacing-xl: 3rem;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

.epc-page {
  min-height: 100vh;
}

.epc-container {
  max-width: var(--epc-page-max-width);
  margin: 0 auto;
  padding: var(--epc-spacing-lg) var(--epc-spacing-md);
}

/* Hero */

.epc-hero {
  position: relative;
  padding: var(--epc-spacing-xl) 0 var(--epc-spacing-lg);
  background: url("../../../images/edu/eduPreC/bg-eduPreC.png") center center no-repeat;
  background-size: cover;
  text-align: center;
  color: #ffffff;
}

.epc-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.95));
  z-index: 1;
}

.epc-hero .container,
.epc-hero-content {
  position: relative;
  z-index: 2;
}

.epc-hero-content {
  max-width: 720px;
  margin: 0 auto;
}

.epc-hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--epc-text-muted);
  margin: 0 0 var(--epc-spacing-xs);
}

.epc-hero-title {
  margin: 0 0 var(--epc-spacing-xs);
  font-size: clamp(1.9rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.epc-hero-subtitle {
  margin: 0 0 var(--epc-spacing-sm);
  font-size: 1rem;
  color: var(--epc-text-muted);
}

.epc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--epc-spacing-xs);
  align-items: center;
  justify-content: center;
  margin-bottom: var(--epc-spacing-sm);
}

.epc-meta-item {
  font-size: 0.9rem;
  color: var(--epc-text-muted);
}

.epc-hero-actions {
  margin-top: var(--epc-spacing-sm);
}

/* Badges */

.epc-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.8rem;
  border-radius: var(--epc-radius-pill);
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--epc-primary);
  font-size: 0.8rem;
  font-weight: 500;
}

.epc-badge--success {
  background-color: rgba(46, 125, 50, 0.08);
  color: var(--epc-success);
}

.epc-badge--warn {
  background-color: rgba(249, 168, 37, 0.08);
  color: var(--epc-warn);
}

.epc-badge--danger {
  background-color: rgba(198, 40, 40, 0.08);
  color: var(--epc-danger);
}

/* Sections & cards */

.epc-section {
  padding: 0 0 var(--epc-spacing-xl);
  background-color: #000000;
  color: var(--epc-text-main);
}

.epc-section-title {
  margin: 0 0 var(--epc-spacing-sm);
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--epc-primary);
}

.epc-section-text {
  margin: 0 0 var(--epc-spacing-sm);
  color: var(--epc-text-main);
}

.epc-card {
  background-color: var(--epc-surface);
  border-radius: var(--epc-radius-lg);
  padding: var(--epc-spacing-lg);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  border: 1px solid var(--epc-border-subtle);
  color: var(--epc-text-main);
}

.epc-card--final {
  border-style: dashed;
}

.epc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--epc-spacing-md);
}

.epc-card-title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--epc-primary);
}

.epc-card-text {
  margin: 0 0 0.6rem;
  color: var(--epc-text-main);
}

.epc-card-example {
  margin: 0.25rem 0;
  color: var(--epc-text-main);
  font-size: 0.95rem;
}

/* Lists */

.epc-list {
  padding-left: 1.1rem;
  margin: 0 0 var(--epc-spacing-sm);
  color: var(--epc-text-muted);
}

.epc-list li {
  margin-bottom: 0.25rem;
}

.epc-list--inline {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
  margin-top: 0.25rem;
}

.epc-list--inline li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* Buttons */

.epc-actions,
.epc-panel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: var(--epc-spacing-sm) 0 var(--epc-spacing-md);
}

.epc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.2rem;
  border-radius: 4px;
  border: 1px solid var(--epc-primary);
  background: transparent;
  color: var(--epc-primary);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  box-shadow: none;
}

.epc-btn:hover {
  background-color: var(--epc-primary-dark);
  border-color: var(--epc-primary-dark);
  color: #000000;
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.35);
}

.epc-btn:focus-visible {
  outline: 2px solid #1d4ed8;
  outline-offset: 2px;
}

.epc-btn:active {
  box-shadow: none;
}

.epc-btn--ghost {
  background: transparent;
  color: var(--epc-text-main);
  border-color: rgba(148, 163, 184, 0.6);
  box-shadow: none;
}

.epc-btn--ghost:hover {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--epc-primary);
  color: var(--epc-text-main);
}

/* Diagnostic panel */

.epc-panel {
  margin-top: var(--epc-spacing-md);
  padding-top: var(--epc-spacing-md);
  border-top: 1px dashed rgba(148, 163, 184, 0.6);
}

.epc-panel--collapsed {
  display: none;
}

.epc-panel-intro {
  margin: 0 0 var(--epc-spacing-sm);
  color: var(--epc-text-muted);
}

.epc-criteria-title {
  margin: var(--epc-spacing-sm) 0 0.25rem;
  font-size: 0.95rem;
}

.epc-questions-groupTitle {
  margin: var(--epc-spacing-md) 0 var(--epc-spacing-xs);
  font-size: 1rem;
}

.epc-questions {
  margin-top: var(--epc-spacing-sm);
}

.epc-question {
  margin-bottom: var(--epc-spacing-md);
  padding: var(--epc-spacing-sm) var(--epc-spacing-sm);
  border-radius: var(--epc-radius-md);
  border: 1px solid rgba(148, 163, 184, 0.4);
  background-color: #050505;
}

.epc-question-title {
  margin: 0 0 0.1rem;
  font-size: 0.9rem;
  color: var(--epc-text-muted);
}

.epc-question-text {
  margin: 0 0 0.35rem;
}

.epc-input-label {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 0.85rem;
  color: var(--epc-text-muted);
}

.epc-input {
  width: 100%;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  border: 1px solid rgba(148, 163, 184, 0.9);
  background-color: #000000;
  color: var(--epc-text-main);
  font-size: 0.95rem;
  font-family: inherit;
}

.epc-input:focus-visible {
  outline: 2px solid rgba(37, 99, 235, 0.5);
  outline-offset: 1px;
  border-color: transparent;
}

.epc-question-solution {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
  color: var(--epc-text-muted);
  display: none;
}

.epc-panel--showSolutions .epc-question-solution {
  display: block;
}

/* Result / alerts */

.epc-result {
  margin-top: var(--epc-spacing-md);
  border-radius: var(--epc-radius-md);
  padding: var(--epc-spacing-sm) var(--epc-spacing-md);
  font-size: 0.95rem;
  background-color: #050505;
  border: 1px solid var(--epc-border-subtle);
  color: var(--epc-text-main);
}

.epc-result--success {
  background-color: rgba(34, 197, 94, 0.08);
  border-color: rgba(34, 197, 94, 0.6);
  color: #4ade80;
}

.epc-result--warn {
  background-color: rgba(250, 204, 21, 0.08);
  border-color: rgba(250, 204, 21, 0.6);
  color: #facc15;
}

.epc-result--danger {
  background-color: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.6);
  color: #f97373;
}

.epc-result-title {
  margin: 0 0 0.15rem;
  font-weight: 600;
}

.epc-result-detail {
  margin: 0;
}

/* Contenedor de resultado del diagnóstico */
.diag-resultado {
  margin-top: var(--epc-spacing-md);
}

/* Math inline */

.epc-math {
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.94em;
}

/* Final section */

.epc-section--final {
  padding-bottom: var(--epc-spacing-xl);
}

/* Responsive */

@media (max-width: 768px) {
  .epc-container {
    padding: var(--epc-spacing-md) var(--epc-spacing-sm);
  }

  .epc-card {
    padding: var(--epc-spacing-md);
  }

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

  .epc-hero {
    padding-top: var(--epc-spacing-lg);
  }
}

@media (max-width: 480px) {
  .epc-hero-title {
    font-size: 1.7rem;
  }

  .epc-section {
    padding-bottom: var(--epc-spacing-lg);
  }

  .epc-question {
    padding: var(--epc-spacing-xs) var(--epc-spacing-xs);
  }
}