:root {
  --theme-accent: #2563eb;
  --theme-accent-strong: #1d4ed8;
  --theme-accent-soft: #dbeafe;
  --theme-surface-tint: #e0f2fe;
  --page-bg: #cfe8ff;
  --panel-bg: #dbeafe;
  --panel-border: rgba(59, 130, 246, 0.24);
  --text-main: #0f172a;
  --text-soft: #334155;
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.12);
  --shadow-md: 0 14px 32px rgba(15, 23, 42, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.topics-body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-main);
  font-family: "Nunito", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.24), transparent 32%),
    radial-gradient(circle at bottom right, rgba(37, 99, 235, 0.16), transparent 28%),
    linear-gradient(180deg, var(--theme-surface-tint) 0%, #dbeafe 45%, #cfe8ff 100%);
}

.topics-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.topics-shell-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: rgba(219, 234, 254, 0.94);
  border-bottom: 1px solid rgba(59, 130, 246, 0.16);
}

.topics-shell-header .topics-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand-link,
.text-link,
.ghost-link,
.card-link,
.cta-link {
  text-decoration: none;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--text-main);
}

.brand-link img {
  width: 138px;
  height: 58px;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 12px 24px rgba(14, 165, 233, 0.14);
}

.brand-title {
  display: block;
  font-family: "Montserrat", "Segoe UI", sans-serif;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.brand-subtitle {
  display: block;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.header-actions,
.topic-meta-pills,
.hero-stats,
.card-meta,
.section-actions,
.completion-actions,
.navigation-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.header-pill,
.meta-pill,
.status-pill,
.mini-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.9rem;
}

.header-pill,
.meta-pill,
.mini-pill {
  background: rgba(219, 234, 254, 0.95);
  border: 1px solid rgba(59, 130, 246, 0.18);
  color: var(--text-main);
}

.status-pill.status-nuevo {
  background: #eff6ff;
  color: #1d4ed8;
}

.status-pill.status-en-curso {
  background: var(--theme-accent-soft);
  color: var(--theme-accent-strong);
}

.status-pill.status-completado {
  background: #dcfce7;
  color: #166534;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  padding: 1.25rem 0 0.4rem;
  color: var(--text-soft);
  font-weight: 700;
  font-size: 0.95rem;
}

.breadcrumb a {
  color: var(--theme-accent-strong);
}

.hero-card,
.topic-summary-card,
.topics-panel,
.topic-card,
.completion-panel,
.error-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.hero-card,
.topic-summary-card,
.completion-panel,
.error-panel {
  padding: clamp(1.5rem, 3vw, 2.4rem);
}

.topic-summary-card {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 1.25rem;
  margin: 1rem 0 1.25rem;
}

.topic-card,
.topic-summary-card,
.completion-panel,
.error-panel,
.hero-card,
.progress-box,
.card-side,
.topic-side,
.activity-card,
.closure-note {
  background: linear-gradient(180deg, rgba(219, 234, 254, 0.98), rgba(191, 219, 254, 0.95));
}

.topic-card,
.activity-card,
.progress-box,
.card-side,
.topic-side,
.closure-note {
  border-color: rgba(37, 99, 235, 0.18);
}

.hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.95fr);
  gap: 1.5rem;
  margin: 1rem 0 2rem;
  background:
    linear-gradient(135deg, rgba(219, 234, 254, 0.96), rgba(191, 219, 254, 0.94)),
    linear-gradient(135deg, rgba(192, 234, 255, 0.5), rgba(255, 255, 255, 0.78));
}

.hero-kicker,
.topic-kicker,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
  color: var(--theme-accent-strong);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
}

.hero-title,
.topic-title,
.completion-title,
.error-title {
  margin: 0;
  font-family: "Montserrat", "Segoe UI", sans-serif;
  font-size: clamp(2rem, 4vw, 3.15rem);
  line-height: 1.08;
}

.hero-copy,
.hero-copy p,
.topic-summary,
.progress-copy,
.completion-copy,
.error-copy,
.tab-panel {
  color: var(--text-soft);
  font-size: 1.04rem;
  line-height: 1.72;
}

.progress-box,
.card-side,
.topic-side,
.activity-card,
.closure-note {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.15rem;
}

.progress-track {
  width: 100%;
  height: 14px;
  margin: 0.9rem 0 0.6rem;
  background: rgba(203, 213, 225, 0.6);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--theme-accent), var(--theme-accent-strong));
  transition: width 0.35s ease;
}

.topic-card-grid,
.topic-layout {
  display: grid;
  gap: 1.25rem;
}

.topic-card-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.topic-card {
  overflow: hidden;
  padding: 1rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.topic-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 40px rgba(15, 23, 42, 0.14);
}

.topic-card img,
.carousel-stage img,
.modal-content img {
  width: 100%;
  display: block;
  object-fit: cover;
}

.topic-card-image {
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(180deg, #e2e8f0, #f8fafc);
}

.topic-card-content {
  padding: 1.1rem 0.25rem 0.2rem;
}

.topic-card-title {
  margin: 0 0 0.55rem;
  font-family: "Montserrat", "Segoe UI", sans-serif;
  font-size: 1.24rem;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 1rem;
}

.section-title {
  margin: 0;
  font-family: "Montserrat", "Segoe UI", sans-serif;
  font-size: clamp(1.4rem, 2vw, 2rem);
}

.topic-layout {
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  margin: 1.25rem 0;
}

.topics-panel {
  position: relative;
  padding: 1.2rem;
}

.carousel-stage {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #dbeafe, #eff6ff);
}

.carousel-stage img,
.carousel-stage iframe,
.carousel-stage video {
  width: 100%;
  height: 100%;
}

.carousel-nav,
.button-primary,
.button-secondary,
.button-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-weight: 900;
}

.carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  background: rgba(15, 23, 42, 0.66);
  color: white;
}

.carousel-nav.prev { left: 0.85rem; }
.carousel-nav.next { right: 0.85rem; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 0.55rem;
  margin-top: 0.95rem;
}

.carousel-dot {
  width: 11px;
  height: 11px;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: rgba(148, 163, 184, 0.6);
}

.carousel-dot.active { background: var(--theme-accent); }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.tab-button {
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 999px;
  padding: 0.78rem 1rem;
  background: white;
  color: var(--text-soft);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.tab-button.active {
  color: white;
  background: linear-gradient(135deg, var(--theme-accent), var(--theme-accent-strong));
}

.tab-panel h3 {
  margin-top: 0;
  font-family: "Montserrat", "Segoe UI", sans-serif;
}

.tab-panel ul,
.activity-steps {
  padding-left: 1.2rem;
}

.activity-card {
  background: linear-gradient(180deg, rgba(235, 245, 255, 0.96), rgba(219, 234, 254, 0.9));
}

.button-primary,
.button-secondary,
.button-ghost {
  padding: 0.9rem 1.2rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button-primary {
  color: white;
  background: linear-gradient(135deg, var(--theme-accent), var(--theme-accent-strong));
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.14);
}

.button-secondary {
  color: var(--theme-accent-strong);
  background: rgba(235, 242, 255, 0.96);
  border: 1px solid rgba(59, 130, 246, 0.22);
}

.button-ghost {
  color: var(--text-main);
  background: transparent;
}

.button-primary:hover,
.button-secondary:hover,
.button-ghost:hover,
.topic-card .button-secondary:hover {
  transform: translateY(-2px);
}

.carousel-nav {
  transition: none !important;
}

.carousel-nav:hover,
.carousel-nav:focus,
button.carousel-nav:hover,
button.carousel-nav:focus,
.modal-controls button:hover {
  transform: none !important;
}

.button-secondary:disabled,
.button-primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.navigation-buttons {
  justify-content: space-between;
  margin: 0.8rem 0 1.5rem;
}

.completion-panel[hidden],
.error-panel[hidden],
.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(15, 23, 42, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-card {
  width: min(980px, 100%);
  background: rgb(211, 218, 249);
  border-radius: var(--radius-xl);
  padding: 1rem;
}

.modal-content img,
.modal-content iframe,
.modal-content video {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  border-radius: var(--radius-lg);
}

.modal-content iframe,
.modal-content video {
  aspect-ratio: 16 / 9;
  width: 100%;
  height: auto;
}

.modal-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.modal-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.modal-controls .modal-zoom-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.modal-controls .zoom-label {
  font-weight: 800;
  color: var(--text-main);
}

.modal-content {
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  max-height: 78vh;
  background: rgba(15, 23, 42, 0.04);
  border-radius: var(--radius-lg);
}

.modal-content img,
.modal-content iframe,
.modal-content video {
  width: 100%;
  max-height: 78vh;
  object-fit: contain;
  border-radius: var(--radius-lg);
}

.modal-content::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.modal-content::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.08);
  border-radius: 999px;
}

.modal-content::-webkit-scrollbar-thumb {
  background: rgba(37, 99, 235, 0.4);
  border-radius: 999px;
}

.modal-content img {
  transition: transform 0.2s ease;
}

@media (max-width: 920px) {
  .hero-card,
  .topic-layout,
  .topic-summary-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topics-shell {
    width: min(100% - 1rem, 100%);
  }

  .topics-shell-header .topics-shell {
    padding: 0.8rem 0;
  }

  .brand-link img {
    width: 48px;
    height: 48px;
  }

  .hero-card,
  .topic-summary-card,
  .topics-panel,
  .completion-panel,
  .error-panel {
    border-radius: 20px;
  }

  .navigation-buttons {
    flex-direction: column;
  }

  .button-primary,
  .button-secondary,
  .button-ghost {
    width: 100%;
  }
}