/* =============================================
   Concurso de Robótica — Estilos principales
   ============================================= */

:root {
  --color-primary: #1a56db;
  --color-primary-dark: #1344b0;
  --color-secondary: #f97316;
  --color-dark: #1e293b;
  --color-light: #f8fafc;
  --color-muted: #64748b;
  --color-white: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --radius: 8px;
  --container-width: 1100px;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--color-dark);
  background: var(--color-light);
  line-height: 1.6;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.section-title {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--color-dark);
}

/* ---------- Encabezado superior ---------- */
.header-top {
  background: var(--color-white);
  border-bottom: 1px solid #e2e8f0;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-top__logo {
  flex: 0 0 120px;
}

.logo {
  max-height: 70px;
  width: auto;
  object-fit: contain;
}

/* ---------- Contador regresivo ---------- */
.countdown {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex: 1;
}

.countdown__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  min-width: 64px;
}

.countdown__value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
}

.countdown__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
  opacity: 0.9;
}

/* ---------- Banner principal ---------- */
.hero-banner {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('../assets/img/banner-hero.svg') center / cover no-repeat;
  background-color: var(--color-dark);
}

.hero-banner__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
}

.hero-banner__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-white);
  padding: 3rem 1.25rem;
}

.hero-banner__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.hero-banner__subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 2rem;
}

.hero-banner__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--primary {
  background: var(--color-secondary);
  color: var(--color-white);
}

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

/* ---------- Redes sociales ---------- */
.social-bar {
  background: var(--color-dark);
  color: var(--color-white);
  padding: 0.75rem 0;
}

.social-bar__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-bar__label {
  font-size: 0.875rem;
  opacity: 0.8;
}

.social-bar__links {
  display: flex;
  gap: 1.25rem;
}

.social-link {
  font-size: 0.875rem;
  font-weight: 600;
  transition: color 0.15s;
}

.social-link:hover {
  color: var(--color-secondary);
}

/* ---------- Carrusel de fotos ---------- */
.photo-carousel {
  overflow: hidden;
  background: #0f172a;
  padding: 1rem 0;
}

.photo-carousel__track {
  display: flex;
  gap: 1rem;
  width: max-content;
  animation: scroll-carousel 30s linear infinite;
}

.photo-carousel__track:hover {
  animation-play-state: paused;
}

.photo-carousel__slide {
  flex-shrink: 0;
  width: 280px;
  height: 180px;
  border-radius: var(--radius);
  overflow: hidden;
}

.photo-carousel__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@keyframes scroll-carousel {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---------- Auspiciantes ---------- */
.sponsors {
  padding: 2.5rem 0;
  background: var(--color-white);
}

.sponsors__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.sponsor-card {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 160px;
  height: 90px;
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius);
  transition: box-shadow 0.15s, transform 0.15s;
}

.sponsor-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.sponsor-card img {
  max-height: 60px;
  object-fit: contain;
}

/* ---------- Estadísticas ---------- */
.stats {
  padding: 2rem 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
}

.stats__grid {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
  border-radius: var(--radius);
  padding: 1.5rem 2.5rem;
  color: var(--color-white);
  min-width: 200px;
}

.stat-card__number {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
}

.stat-card__label {
  font-size: 0.95rem;
  margin-top: 0.5rem;
  text-align: center;
}

/* ---------- Navegación principal (5 botones) ---------- */
.main-nav {
  padding: 2.5rem 0;
}

.main-nav__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem 1rem;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.nav-btn:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.nav-btn__icon {
  font-size: 2rem;
}

.nav-btn__text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-dark);
}

/* ---------- Instituciones participantes ---------- */
.institutions {
  padding: 2.5rem 0 3rem;
  background: var(--color-white);
}

.institutions__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1.25rem;
}

.institution-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100px;
  padding: 0.75rem;
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius);
  background: var(--color-light);
}

.institution-logo img {
  max-height: 70px;
  object-fit: contain;
}

.institution-logo--placeholder {
  color: var(--color-muted);
  font-size: 0.85rem;
  text-align: center;
}

/* ---------- Pie de página ---------- */
.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.875rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .header-top__inner {
    flex-direction: column;
  }

  .header-top__logo {
    flex: none;
  }

  .countdown {
    order: -1;
  }

  .countdown__item {
    min-width: 52px;
    padding: 0.4rem 0.5rem;
  }

  .countdown__value {
    font-size: 1.25rem;
  }

  .hero-banner {
    min-height: 320px;
  }
}