:root {
  --primary: #673ab7;
  --primary-dark: #4a2b86;
  --secondary: #ff7043;
  --background: #0b0b16;
  --surface: #131329;
  --surface-light: rgba(255, 255, 255, 0.08);
  --text: #f5f5f5;
  --muted: #b9b9d6;
  --max-width: 1100px;
  --shadow: 0 20px 40px rgba(22, 17, 45, 0.45);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Montserrat', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top left, rgba(103, 58, 183, 0.2), transparent 50%),
    radial-gradient(circle at bottom right, rgba(255, 112, 67, 0.15), transparent 55%),
    var(--background);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Estilos de foco para accesibilidad con teclado */
a:focus-visible,
button:focus-visible,
.button:focus-visible,
.cta:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Skip link para accesibilidad */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary);
  color: white;
  padding: 8px 16px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  z-index: 1000;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 6px;
}

ul {
  list-style: none;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 32px 6vw 96px;
  background: linear-gradient(135deg, rgba(103, 58, 183, 0.95), rgba(39, 27, 64, 0.9));
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url('https://www.transparenttextures.com/patterns/cubes.png');
  opacity: 0.12;
  pointer-events: none;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  z-index: 2;
  position: relative;
}

.logo {
  display: inline-flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: inherit;
}

.logo img {
  display: block;
  height: 144px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-weight: 500;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.nav-links a {
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 2px;
  border-radius: 4px;
}

.menu-toggle span {
  width: 26px;
  height: 3px;
  background: var(--text);
  border-radius: 3px;
  transition: transform 0.3s ease;
}

.hero-content {
  max-width: 720px;
  margin: 12vh auto 0;
  text-align: center;
  position: relative;
  z-index: 2;
}

.tagline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-top: 24px;
  letter-spacing: -0.02em;
}

.hero .description {
  margin-top: 20px;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.86);
}

.cta {
  display: inline-block;
  margin-top: 32px;
  padding: 14px 32px;
  border-radius: 999px;
  background: var(--secondary);
  color: #0b0312;
  font-weight: 600;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 18px 30px rgba(255, 112, 67, 0.35);
}

.cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 36px rgba(255, 112, 67, 0.45);
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.hero-actions .cta,
.hero-actions .button {
  margin-top: 0;
}

.section {
  padding: 96px 6vw;
  position: relative;
}

.section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.02);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

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

.section-header {
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}

.community-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.community-actions .button {
  margin-top: 0;
}

.button-secondary {
  background: transparent;
  border: 2px solid var(--secondary);
  color: var(--secondary);
}

.button-secondary:hover {
  background: rgba(255, 112, 67, 0.1);
  color: var(--secondary);
}

.subtitle {
  color: var(--secondary);
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.section h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-top: 14px;
}

.section p {
  color: var(--muted);
  margin-top: 14px;
}

.community {
  background: linear-gradient(150deg, rgba(103, 58, 183, 0.18), rgba(19, 19, 41, 0.92));
}

.community-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.community-card {
  padding: 32px;
  border-radius: 24px;
  background: rgba(12, 12, 28, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
}

.community-card h3 {
  font-size: 1.3rem;
}

.event-overview {
  background: linear-gradient(160deg, rgba(19, 19, 41, 0.9), rgba(103, 58, 183, 0.15));
}

.event-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.event-card {
  padding: 32px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(19, 19, 41, 0.78), rgba(19, 19, 41, 0.5));
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow);
  display: grid;
  gap: 18px;
}

.event-card h3 {
  font-size: 1.4rem;
}

.event-card ul {
  display: grid;
  gap: 12px;
}

.event-card li {
  position: relative;
  padding-left: 26px;
  color: var(--muted);
}

.event-card li::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--secondary);
  box-shadow: 0 0 0 4px rgba(255, 112, 67, 0.18);
}

.tickets .ticket-card,
.sponsor-benefit,
.speaker-card,
.organizer-card,
.sponsor-tier,
.agenda-list li,
.location-details {
  background: linear-gradient(135deg, rgba(19, 19, 41, 0.75), rgba(19, 19, 41, 0.45));
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.organizer-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.organizer-card {
  background: linear-gradient(135deg, rgba(19, 19, 41, 0.85), rgba(39, 19, 64, 0.6));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  align-items: start;
  text-align: left;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.organizer-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.organizer-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 32px 48px rgba(22, 17, 45, 0.5);
  border-color: rgba(255, 112, 67, 0.3);
}

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

.organizer-photo {
  width: 120px;
  height: 120px;
  border-radius: 20px;
  object-fit: cover;
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.4);
  border: 3px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.organizer-card:hover .organizer-photo {
  transform: scale(1.05);
  box-shadow: 0 25px 40px rgba(0, 0, 0, 0.5);
}

.organizer-card h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--text);
}

.organizer-role {
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 16px;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.organizer-card p {
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.95rem;
}

.organizer-tags {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.organizer-tags li {
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.sponsor-list {
  max-width: var(--max-width);
  margin: 0 auto 48px;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.sponsor-tiers-home {
  max-width: var(--max-width);
  margin: 0 auto 48px;
  display: grid;
  gap: 28px;
}

.sponsor-tier-block {
  padding: 28px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(19, 19, 41, 0.78), rgba(19, 19, 41, 0.5));
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow);
}

.sponsor-tier-title {
  margin-bottom: 18px;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.9);
}

.sponsor-logos {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  align-items: center;
}

.sponsor-logo {
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.sponsor-logo:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 112, 67, 0.28);
  background: rgba(255, 255, 255, 0.06);
}

.sponsor-logo img {
  width: 100%;
  max-width: 240px;
  height: 64px;
  object-fit: contain;
  filter: drop-shadow(0 14px 24px rgba(0, 0, 0, 0.35));
}

.sponsor-card {
  padding: 40px 32px;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(19, 19, 41, 0.88), rgba(19, 19, 41, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: grid;
  gap: 12px;
  justify-items: center;
  text-align: center;
  box-shadow: var(--shadow);
}

.sponsor-card p {
  font-size: 1.3rem;
  font-weight: 600;
}

.sponsor-card span {
  color: var(--muted);
}

.sponsor-card--placeholder {
  border-style: dashed;
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(19, 19, 41, 0.6);
}

.ticket-card {
  max-width: 420px;
  margin: 0 auto;
  text-align: center;
}

.ticket-card h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 24px;
  padding: 12px 28px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  transition: transform 0.3s ease, background 0.3s ease;
}

.button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.event-actions {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.event-actions .button {
  margin-top: 0;
}

.sponsor-invite {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 48px;
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.sponsor-invite p {
  font-size: 1.1rem;
  color: var(--muted);
}

.sponsor-invite .button {
  margin-top: 32px;
}

.sponsor-tiers {
  max-width: var(--max-width);
  margin: 0 auto 48px;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.sponsor-tier {
  position: relative;
  padding-top: 48px;
  min-height: 280px;
}

.sponsor-tier h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.tier-label {
  position: absolute;
  top: 24px;
  left: 32px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
}

.tier-placeholder {
  margin-top: 28px;
  padding: 14px;
  border-radius: 14px;
  text-align: center;
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-weight: 600;
}

.sponsor-tier--gold {
  border: 1px solid rgba(255, 215, 0, 0.3);
  box-shadow: 0 25px 40px rgba(255, 215, 0, 0.12);
}

.sponsor-tier--gold .tier-label {
  background: rgba(255, 215, 0, 0.18);
  color: #ffe082;
}

.sponsor-tier--silver {
  border: 1px solid rgba(192, 192, 192, 0.35);
  box-shadow: 0 25px 40px rgba(192, 192, 192, 0.15);
}

.sponsor-tier--silver .tier-label {
  background: rgba(224, 224, 224, 0.16);
  color: #f5f5f5;
}

.sponsor-tier--community {
  border: 1px solid rgba(103, 58, 183, 0.35);
  box-shadow: 0 25px 40px rgba(103, 58, 183, 0.18);
}

.sponsor-tier--community .tier-label {
  background: rgba(103, 58, 183, 0.28);
  color: #d1c4e9;
}

.sponsor-benefits {
  max-width: var(--max-width);
  margin: 0 auto 64px;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.sponsor-benefit h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.sponsor-benefit p {
  color: var(--muted);
}

.sponsor-cta {
  max-width: 540px;
  margin: 0 auto;
  text-align: center;
}

.sponsor-cta p {
  margin-top: 16px;
  color: var(--muted);
}

.subpage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 6vw 0;
  max-width: var(--max-width);
  margin: 0 auto;
}

.subpage-header .logo {
  font-weight: 700;
  letter-spacing: 0.04em;
}

.year-selector {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.year-button {
  padding: 10px 22px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: transparent;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
}

.year-button:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 2px;
}

.year-button.active,
.year-button:hover {
  background: var(--secondary);
  color: #0b0312;
  transform: translateY(-2px);
}

.speakers-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}

.speaker-card {
  text-align: center;
  padding: 36px 24px;
  position: relative;
  overflow: hidden;
}

.speaker-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(103, 58, 183, 0.35), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.avatar {
  width: 70px;
  height: 70px;
  margin: 0 auto 18px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.agenda-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 32px;
}

.agenda-day h3 {
  font-size: 1.6rem;
  margin-bottom: 24px;
}

.agenda-list {
  display: grid;
  gap: 18px;
}

.agenda-list li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 24px;
  align-items: center;
}

.time {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--secondary);
}

.meetups {
  background: linear-gradient(145deg, rgba(103, 58, 183, 0.3), rgba(19, 19, 41, 0.95));
}

.meetups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.meetup-card {
  padding: 32px;
  border-radius: 24px;
  background: rgba(12, 12, 28, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
}

.meetup-card h3 {
  font-size: 1.2rem;
}

.meetup-card p {
  color: var(--muted);
}

.meetups-cta {
  margin: 48px auto 0;
  max-width: 540px;
  text-align: center;
  display: grid;
  gap: 14px;
}

.meetups-cta .button {
  justify-self: center;
}

.meetups-program {
  background: linear-gradient(145deg, rgba(39, 19, 64, 0.9), rgba(12, 12, 28, 0.95));
}

.meetup-schedule {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.meetup-highlight {
  padding: 32px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(26, 26, 54, 0.85), rgba(39, 19, 64, 0.7));
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
}

.meetup-date {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary);
}

.meetups-community {
  background: linear-gradient(145deg, rgba(12, 12, 28, 0.96), rgba(103, 58, 183, 0.25));
}

.meetups-community-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.location-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  align-items: stretch;
}

.location-details ul {
  margin-top: 20px;
  display: grid;
  gap: 10px;
  color: var(--muted);
}

.map-container iframe {
  width: 100%;
  min-height: 340px;
  border: none;
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.agenda-placeholder {
  padding: 40px;
  text-align: center;
  color: var(--muted);
}

.agenda-placeholder h3 {
  margin-bottom: 16px;
  color: var(--text);
}

.footer {
  padding: 32px 6vw;
  text-align: center;
  background: rgba(10, 10, 24, 0.9);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--muted);
}

.hidden {
  display: none !important;
}

/* Mejora para reducir movimiento en dispositivos con preferencia */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 900px) {
  .navbar {
    position: relative;
  }

  .menu-toggle {
    display: flex;
  }

  /* Mobile: align dropdown under the hamburger button and cancel desktop centering transform */
  .nav-links {
    position: absolute;
    top: calc(100% + 12px);
    right: 16px;
    left: auto;
    transform: none;
    flex-direction: column;
    background: rgba(10, 10, 24, 0.98);
    padding: 16px 20px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    display: none;
    min-width: 180px;
    z-index: 99999; /* ensure menu overlays hero and other elements */
    backdrop-filter: blur(8px);
  }

  /* Mobile menu backdrop overlay */
  .nav-menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.2);
    z-index: 99998;
    display: none;
  }

  .nav-menu-backdrop.open {
    display: block;
  }

  .nav-links.open {
    display: flex;
  }

  /* Fallback: mostrar menú si JavaScript no funciona en móvil */
  @supports not (display: flex) {
    .nav-links {
      display: block;
    }
  }

  .hero-content {
    margin-top: 16vh;
  }

  .community-grid,
  .event-grid {
    grid-template-columns: 1fr;
  }

  .agenda-list li {
    grid-template-columns: 1fr;
    text-align: left;
  }

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

@media (max-width: 600px) {
  .hero {
    padding-top: 24px;
  }

  .hero-content {
    margin-top: 20vh;
  }

  .tagline {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
  }

  .logo img {
    height: 104px;
  }

  .section {
    padding: 72px 6vw;
  }

  .ticket-card,
  .speaker-card,
  .agenda-list li,
  .location-details {
    padding: 24px;
  }
}

/* Botón volver arriba */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  color: white;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 8px 24px rgba(103, 58, 183, 0.4);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(103, 58, 183, 0.5);
}

.back-to-top:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 2px;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top svg {
  transition: transform 0.3s ease;
}

.back-to-top:hover svg {
  transform: translateY(-2px);
}

/* Responsive para móvil */
@media (max-width: 768px) {
  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
  }

  .back-to-top svg {
    width: 20px;
    height: 20px;
  }
}