:root {
  --blue: #1f4f9d;
  --blue-dark: #11366f;
  --blue-deep: #092456;
  --yellow: #f4cf30;
  --yellow-soft: #ffec87;
  --white: #ffffff;
  --ink: #12213f;
  --muted: #55627a;
  --card: rgba(255, 255, 255, 0.94);
  --shadow: 0 24px 80px rgba(3, 21, 58, 0.22);
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  font-family: "Nunito", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(120% 100% at 78% 30%, #3d68b8 0%, #274b8f 42%, #142a54 100%);
  overflow-x: hidden;
}

#fondo-cientifico {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

#fondo-cientifico .glow-a {
  position: absolute;
  width: 520px;
  height: 520px;
  left: -140px;
  top: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0) 70%);
}

#fondo-cientifico .glow-b {
  position: absolute;
  width: 380px;
  height: 380px;
  right: -90px;
  bottom: -140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(120, 170, 255, 0.16), rgba(120, 170, 255, 0) 70%);
}

@keyframes floatA {
  0%, 100% { transform: translateY(0) rotate(var(--r, 0deg)); }
  50% { transform: translateY(-14px) rotate(var(--r, 0deg)); }
}

@keyframes floatB {
  0%, 100% { transform: translateY(0) rotate(var(--r, 0deg)); }
  50% { transform: translateY(16px) rotate(calc(var(--r, 0deg) + 4deg)); }
}

@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes spinSlowRev {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

@keyframes twinkle {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.9; }
}

#fondo-cientifico svg,
#fondo-cientifico .star {
  position: absolute;
}

#fondo-cientifico .star {
  border-radius: 50%;
  background: #f2c94c;
  box-shadow: 0 0 6px 1px rgba(242, 201, 76, 0.8);
  animation: twinkle 3s ease-in-out infinite;
}

.science-pattern,
body::before,
body::after {
  display: none;
}

.skip-link,
.site-header,
main,
footer {
  position: relative;
  z-index: 1;
}

.skip-link {
  position: absolute;
  top: 1rem;
  left: 1rem;
  transform: translateY(-160%);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: var(--blue-deep);
  background: var(--yellow);
  font-weight: 900;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  padding: clamp(1.2rem, 4vw, 2.4rem) clamp(1rem, 4vw, 3rem) 0;
}

.header-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 130px 1fr 150px;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.2rem);
  padding: clamp(1rem, 3vw, 1.6rem);
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-xl);
  background: var(--card);
  box-shadow: 0 18px 60px rgba(3, 21, 58, 0.2);
}

.logo {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 10px 18px rgba(0,0,0,0.22));
}

.logo-school {
  max-width: 130px;
}

.logo-fair {
  max-width: 150px;
  justify-self: end;
}

.header-copy {
  color: var(--blue-dark);
  text-align: center;
}

.header-copy .badge {
  display: inline-flex;
  white-space: nowrap;
  padding: 0.35rem 0.7rem;
  font-size: clamp(0.75rem, 1.8vw, 0.95rem);
  color: var(--blue-deep);
}

.eyebrow,
.section-kicker,
.badge {
  margin: 0 0 0.45rem;
  color: var(--blue);
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-copy h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.4rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.subtitle {
  max-width: 620px;
  margin: 0.85rem auto 0;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--muted);
}

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

.hero {
  padding: clamp(1.4rem, 4vw, 3rem) 0;
}

.hero-card {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: clamp(1.2rem, 3vw, 2rem);
  align-items: stretch;
  padding: clamp(1.3rem, 4vw, 2.3rem);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(255,255,255,0.98), rgba(255, 246, 188, 0.94));
  box-shadow: var(--shadow);
}

.hero h2,
.form-intro h2 {
  margin: 0;
  color: var(--blue-dark);
  font-size: clamp(1.9rem, 4vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
}

.hero p,
.form-intro p {
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  color: var(--blue-deep);
  background: var(--yellow);
  box-shadow: 0 8px 0 rgba(31, 79, 157, 0.12);
}

.event-details {
  display: grid;
  gap: 0.9rem;
}

.event-details article {
  padding: 1rem 1.1rem;
  border: 1px solid rgba(31, 79, 157, 0.15);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.8);
}

.event-details span {
  display: block;
  margin-bottom: 0.28rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.event-details strong {
  display: block;
  color: var(--blue-dark);
  font-size: 1.1rem;
  line-height: 1.3;
}

.form-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: start;
  padding-bottom: clamp(2rem, 5vw, 4rem);
}

.form-card {
  position: relative;
  z-index: 1;
  padding: clamp(1.2rem, 4vw, 2.3rem);
  border: 2px solid rgba(244, 207, 48, 0.4);
  border-radius: var(--radius-xl);
  background: var(--card);
  box-shadow: var(--shadow);
}

.hero-card {
  position: relative;
  z-index: 1;
}

.form-intro {
  margin-bottom: 1.5rem;
  margin-top: 0.5rem;
}

.icon-bubble {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin-bottom: 0.9rem;
  border-radius: 22px;
  color: var(--blue-deep);
  background: var(--yellow);
  font-size: 2rem;
  box-shadow: 0 8px 0 rgba(31, 79, 157, 0.12);
}

.section-kicker {
  color: var(--blue);
}

form {
  display: grid;
  gap: 1rem;
}

label {
  display: grid;
  gap: 0.45rem;
  color: var(--blue-deep);
  font-weight: 900;
}

input,
select,
textarea {
  width: 100%;
  border: 2px solid rgba(31, 79, 157, 0.18);
  border-radius: var(--radius-md);
  padding: 0.95rem 1rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 5px rgba(244, 207, 48, 0.28);
}

.select-pair {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
}

.select-pair:has(.letra-select.hidden) {
  grid-template-columns: 1fr;
}

@media (max-width: 600px) {
  .select-pair {
    grid-template-columns: 1fr;
  }

  .select-pair:has(.letra-select.hidden) {
    grid-template-columns: 1fr;
  }
}

.letra-select {
  min-width: 120px;
  transition: opacity 160ms ease, transform 160ms ease;
}

.letra-select.hidden {
  display: none;
}

.submit-button {
  margin-top: 0.45rem;
  border: 0;
  border-radius: 999px;
  padding: 1rem 1.4rem;
  color: var(--blue-deep);
  background: linear-gradient(135deg, var(--yellow), var(--yellow-soft));
  font: inherit;
  font-weight: 1000;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: 0 12px 0 rgba(17, 54, 111, 0.16), 0 22px 45px rgba(244, 207, 48, 0.2);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.submit-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 0 rgba(17, 54, 111, 0.16), 0 26px 50px rgba(244, 207, 48, 0.24);
}

.submit-button:active {
  transform: translateY(2px);
  box-shadow: 0 8px 0 rgba(17, 54, 111, 0.16), 0 16px 30px rgba(244, 207, 48, 0.2);
}

.submit-button[disabled] {
  cursor: wait;
  opacity: 0.72;
}

.form-status {
  min-height: 1.5rem;
  margin: 0.2rem 0 0;
  font-weight: 900;
}

.form-status.success {
  color: #146c43;
}

.form-status.error {
  color: #b42318;
}

footer {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto 1.5rem;
  padding: 1rem;
  border-radius: 999px;
  text-align: center;
  color: rgba(255,255,255,0.9);
  background: rgba(9, 36, 86, 0.3);
}

footer p {
  margin: 0;
  font-weight: 800;
}

@media (max-width: 860px) {
  .header-inner {
    grid-template-columns: 84px 1fr 96px;
    border-radius: 24px;
  }

  .eyebrow {
    font-size: 0.72rem;
  }

  .hero-card,
  .form-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  main,
  footer {
    width: min(100% - 1rem, 1180px);
  }

  .site-header {
    padding-inline: 0.5rem;
  }

  .header-inner {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    text-align: center;
    gap: 0.6rem;
    padding: 0.9rem;
  }

  .logo-school,
  .logo-fair {
    max-width: 110px;
    justify-self: center;
  }

  .logo-fair {
    max-width: 130px;
  }

  .header-copy h1 {
    font-size: clamp(1.6rem, 7vw, 2.2rem);
  }

  .header-copy .badge {
    white-space: normal;
    font-size: 0.72rem;
  }

  .hero-card,
  .form-card {
    border-radius: 24px;
  }

  footer {
    border-radius: 24px;
  }
}