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

:root {
  --bg-dark: #020617;
  --bg-alt: #020617;
  --bg-card: #0b1220;
  --bg-card-alt: #020617;
  --border-subtle: #1f2937;
  --accent: #22c55e;
  --accent-soft: rgba(34, 197, 94, 0.14);
  --accent-strong: #16a34a;
  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --text-soft: #6b7280;
  --danger: #f97373;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.85);
  --shadow-card: 0 16px 40px rgba(15, 23, 42, 0.9);
  --transition-fast: 0.18s ease-out;
  --transition-med: 0.24s ease-out;
  --font-base: 16px;
}

html {
  font-size: var(--font-base);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #020617;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.light-theme {
  background: #f9fafb;
  color: #020617;
}

body.light-theme .topbar,
body.light-theme .sub-header {
  background: #ffffffcc;
  backdrop-filter: blur(16px);
}

body.light-theme .card {
  background: #ffffff;
  border-color: #e5e7eb;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
}

body.light-theme .tag {
  background: #e5e7eb;
  color: #111827;
}

body.light-theme .footer {
  background: #020617;
  border-top-color: #e5e7eb;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  padding: 8px 14px;
  background: #111827;
  color: #f9fafb;
  border-radius: 999px;
  font-size: 0.9rem;
  z-index: 50;
}

.skip-link:focus {
  left: 12px;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: linear-gradient(to right, rgba(15,23,42,0.98), rgba(2,6,23,0.98));
  border-bottom: 1px solid rgba(148,163,184,0.2);
  backdrop-filter: blur(18px);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  gap: 16px;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img {
  width: 46px;
  height: 46px;
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(15,23,42,0.9);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-weight: 650;
  letter-spacing: 0.02em;
  font-size: 0.98rem;
}

.logo-subtitle {
  font-size: 0.8rem;
  color: var(--text-soft);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  border: 1px solid rgba(148,163,184,0.35);
  background: radial-gradient(circle at top, #1f2937, #020617);
  color: var(--text-main);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.icon-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(15,23,42,0.7);
  border-color: var(--accent);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.search-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(15,23,42,0.9);
  border-radius: 999px;
  padding: 4px 10px;
  border: 1px solid rgba(148,163,184,0.4);
}

.search-icon {
  font-size: 0.9rem;
  color: var(--text-soft);
}

#search-input {
  border: none;
  background: transparent;
  color: var(--text-main);
  font-size: 0.85rem;
  width: 150px;
}

#search-input:focus {
  outline: none;
}

.hero {
  padding: 26px 0 18px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr);
  gap: 26px;
  align-items: center;
}

.hero-text h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin-bottom: 10px;
}

.hero-lead {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 40rem;
}

.hero-note {
  font-size: 0.9rem;
  color: var(--text-soft);
  margin-top: 6px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  font-size: 0.78rem;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(15,23,42,0.9);
  border: 1px solid rgba(148,163,184,0.5);
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: default;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med), background var(--transition-med);
}

.tag::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(34,197,94,0.4), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-med);
  pointer-events: none;
}

.tag:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 10px 25px rgba(15,23,42,0.55);
  border-color: rgba(52,211,153,0.9);
  background: rgba(15,23,42,1);
}

.tag:hover::after {
  opacity: 1;
}

.hero-card {
  background: radial-gradient(circle at top left, #111827, #020617);
  border-radius: var(--radius-xl);
  padding: 18px 18px 16px;
  border: 1px solid rgba(148,163,184,0.6);
  box-shadow: var(--shadow-soft);
}

.hero-card h2 {
  font-size: 1.05rem;
  margin-top: 0;
  margin-bottom: 6px;
}

.hero-card ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.hero-card li {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 4px 0;
}

.section {
  padding: 18px 0;
}

.section.alt {
  background: #020617;
}

body.light-theme .section.alt {
  background: #f9fafb;
}

.section h2 {
  font-size: 1.3rem;
  margin-bottom: 14px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  background: radial-gradient(circle at top left, #020617, #020617);
  border-radius: var(--radius-xl);
  padding: 16px 16px 14px;
  border: 1px solid rgba(31,41,55,0.95);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med), background var(--transition-med);
}

.card::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at top left, rgba(34,197,94,0.18), transparent 55%);
  opacity: 0;
  transition: opacity var(--transition-med);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-4px) translateZ(0);
  box-shadow: 0 22px 60px rgba(15,23,42,0.95);
  border-color: rgba(52,211,153,0.75);
}

.card:hover::before {
  opacity: 1;
}

.card.emphasis {
  border-color: rgba(52,211,153,0.9);
  background: radial-gradient(circle at top, rgba(22,163,74,0.15), #020617 50%, #020617 100%);
}

.card h3 {
  font-size: 1.02rem;
  margin-top: 0;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0;
}

.card-actions {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.88rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(to right, var(--accent), var(--accent-strong));
  color: #022c22;
  font-weight: 600;
  box-shadow: 0 12px 32px rgba(34,197,94,0.7);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(34,197,94,0.85);
}

.btn-secondary {
  background: rgba(15,23,42,0.9);
  border-color: rgba(148,163,184,0.8);
  color: var(--text-main);
}

.btn-secondary:hover {
  border-color: var(--accent);
  background: radial-gradient(circle at top, #020617, #020617);
}

.key-list {
  list-style: none;
  padding-left: 0;
  margin: 8px 0;
}

.key-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 3px 0;
}

.note {
  font-size: 0.8rem;
  color: var(--text-soft);
  margin-top: 6px;
}

.sub-header {
  background: linear-gradient(to right, rgba(15,23,42,0.98), rgba(2,6,23,0.98));
  border-bottom: 1px solid rgba(148,163,184,0.25);
}

.sub-header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
}

.sub-back {
  font-size: 0.86rem;
  color: var(--accent);
  text-decoration: none;
  border-radius: 999px;
  padding: 5px 10px;
  border: 1px solid rgba(52,211,153,0.6);
  background: rgba(15,23,42,0.9);
}

.sub-back:hover {
  background: rgba(22,163,74,0.1);
}

.page {
  padding: 16px 0 26px;
}

.page-section {
  margin-bottom: 18px;
}

.page-section h2 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.footer {
  margin-top: auto;
  border-top: 1px solid rgba(148,163,184,0.3);
  background: radial-gradient(circle at top, #020617 0, #020617 40%, #000 100%);
  padding: 14px 0;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(15,23,42,0.5);
}

.footer-meta {
  text-align: right;
}

@media (max-width: 800px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .topbar-right {
    align-self: stretch;
    justify-content: space-between;
    width: 100%;
  }
  .search-wrapper {
    flex: 1;
  }
  #search-input {
    width: 100%;
  }
  .footer-grid {
    flex-direction: column;
    text-align: left;
  }
  .footer-meta {
    text-align: left;
  }
}

/* Simple image carousel for imágenes.html */
.image-carousel {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 12px;
}

.carousel-track {
  position: relative;
  max-width: 720px;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-subtle);
  background: #020617;
}

.carousel-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.02);
  transition: opacity var(--transition-med), transform var(--transition-med);
}

.carousel-image.active {
  opacity: 1;
  transform: scale(1);
}

.carousel-btn {
  border: none;
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  cursor: pointer;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.carousel-btn:hover,
.carousel-btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  background: var(--accent);
  color: #0b1120;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;
}

.carousel-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 1px solid var(--accent-strong);
  background: transparent;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.carousel-dots .dot.active {
  background: var(--accent-strong);
  transform: scale(1.15);
}

/* Light theme adjustments */
body.light-theme .carousel-track {
  background: #f9fafb;
}

.youtube-section .youtube-card {
  position: relative;
  overflow: hidden;
  border-radius: 1.5rem;
  padding: 1.75rem 1.75rem 2rem;
  background: radial-gradient(circle at top left, #ef4444 0, #020617 55%);
  box-shadow: 0 18px 40px rgba(0,0,0,0.45);
}

.youtube-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(239,68,68,0.15), rgba(248,250,252,0.02));
  pointer-events: none;
}

.youtube-card > * {
  position: relative;
  z-index: 1;
}

.youtube-card-header h2 {
  margin-top: 0.4rem;
  margin-bottom: 0.8rem;
}

.youtube-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: rgba(15,23,42,0.9);
  border: 1px solid rgba(248,250,252,0.2);
}

.youtube-tags {
  margin-top: 0.9rem;
  margin-bottom: 1.3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.btn-youtube {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: #ff0000;
  border-color: #ff0000;
}

.btn-youtube:hover {
  background: #dc2626;
  border-color: #dc2626;
  transform: translateY(-1px) scale(1.02);
}

/* =========================================================
   NUEVO: Línea de tiempo de hitos + cartas de vinculación
   ========================================================= */

.timeline-section {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.timeline-header {
  text-align: left;
  margin-bottom: 2rem;
}

.timeline-header h2 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.timeline-header p {
  max-width: 52rem;
  color: #e5e7eb;
  font-size: 0.95rem;
}

.timeline-track {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1.75rem;
  margin-bottom: 2.25rem;
  padding: 1.25rem 1.25rem 1.5rem;
  border-radius: 1.5rem;
  background: radial-gradient(circle at top left, rgba(250, 204, 21, 0.12), rgba(15, 23, 42, 0.98));
  border: 1px solid rgba(148, 163, 184, 0.55);
  box-shadow: 0 22px 45px rgba(15, 23, 42, 0.95);
  overflow: hidden;
}

.timeline-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: linear-gradient(90deg, #facc15, #22c55e, #38bdf8);
  opacity: 0.85;
  transform: translateY(-50%);
  pointer-events: none;
}

.timeline-track-bg {
  position: absolute;
  inset: 0;
  opacity: 0.22;
  background-image: url('../img/hitos_importantes_lpsn.jpg');
  background-size: cover;
  background-position: center;
  mix-blend-mode: soft-light;
  pointer-events: none;
}

.timeline-logo-pill {
  position: absolute;
  top: 0.75rem;
  left: 0.9rem;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem 0.7rem 0.25rem 0.25rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(250, 204, 21, 0.9);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.95);
}

.timeline-logo-pill img {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  background: #facc15;
  padding: 0.15rem;
}

.timeline-logo-pill span {
  font-size: 0.78rem;
  color: #facc15;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.milestone-pill {
  position: relative;
  z-index: 1;
  flex: 1 1 110px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
  background: none;
  border: none;
}

.milestone-dot {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #facc15, #0f172a 65%);
  border: 3px solid #facc15;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fbbf24;
  font-weight: 700;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.95);
  transition: transform 0.25s ease-out, box-shadow 0.25s ease-out, background 0.25s ease-out;
}

.milestone-pill:hover .milestone-dot {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 18px 40px rgba(37, 99, 235, 0.95);
  background: radial-gradient(circle at 30% 30%, #facc15, #111827 70%);
}

.milestone-pill.is-active .milestone-dot {
  transform: translateY(-6px) scale(1.08);
  background: radial-gradient(circle at 30% 30%, #22c55e, #0f172a 70%);
  color: #bbf7d0;
  box-shadow: 0 22px 50px rgba(34, 197, 94, 0.95);
}

.milestone-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #e5e7eb;
  text-align: center;
  max-width: 8rem;
}

.timeline-details {
  margin-top: 2rem;
}

.timeline-details-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .timeline-details-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.timeline-card {
  position: relative;
  padding: 1.6rem 1.4rem 1.4rem 1.4rem;
  border-radius: 1.25rem;
  background: radial-gradient(circle at top left, rgba(250, 204, 21, 0.08), #020617 50%, #020617 100%);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.95);
  overflow: hidden;
}

.timeline-card::before {
  content: "";
  position: absolute;
  inset-block: 0.5rem;
  left: 0.5rem;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(to bottom, #facc15, #22c55e);
  opacity: 0.9;
}

.timeline-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.timeline-card-year {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #facc15;
}

.timeline-card-badge {
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  font-size: 0.78rem;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: #e5e7eb;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
}

.timeline-card h3 {
  font-size: 1.02rem;
  margin-bottom: 0.35rem;
}

.timeline-card p {
  font-size: 0.9rem;
  color: #e5e7eb;
  margin-bottom: 0.25rem;
}

.timeline-card p.small {
  font-size: 0.8rem;
  color: #9ca3af;
}

.timeline-links-title {
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  font-size: 1.2rem;
}

/* Micro-interacciones extra para timeline-card */
.timeline-card {
  cursor: default;
  transition:
    transform 0.22s ease-out,
    box-shadow 0.22s ease-out,
    border-color 0.22s ease-out,
    background 0.22s ease-out;
}

.timeline-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left,
    rgba(250, 204, 21, 0.09),
    transparent 60%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease-out;
}

.timeline-card:hover {
  box-shadow: 0 22px 60px rgba(15, 23, 42, 0.98);
  border-color: rgba(250, 204, 21, 0.9);
  background: radial-gradient(circle at top left,
    rgba(250, 204, 21, 0.1),
    #020617 55%,
    #020617 100%);
}

.timeline-card:hover::after {
  opacity: 1;
}