:root {
  --brand-primary: #1a5fb4;
  --brand-accent:  #e0a800;
  --text-dark:     #1d232a;
  --text-muted:    #6b7280;
  --border-soft:   #e6e6e6;
  --bg-soft:       #f8f9fa;
}

html { scroll-behavior: smooth; }

body.page {
  color: var(--text-dark);
  background: #fff;
}

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

a { transition: color .2s ease, opacity .2s ease; }

.header__title { color: var(--text-dark); }

.search__input { min-width: 360px; }
.search__btn { white-space: nowrap; }

.sidebar {
  position: sticky;
  top: 1rem;          
}
.sidebar__list { gap: .25rem; }
.sidebar__link {
  color: var(--text-dark);
  border-radius: .375rem;
  padding: .375rem .5rem;
  transition: color .2s ease, background-color .2s ease;
}
.sidebar__link:hover,
.sidebar__link:focus {
  color: var(--brand-primary);
  background: var(--bg-soft);
}
.sidebar__link.active {
  font-weight: 600;
  color: var(--brand-primary);
  background: #eaf2fb;
}

.hero__title { color: var(--text-dark); }
.hero__lead  { color: var(--text-muted); }
.hero__image { border: 1px solid var(--border-soft); border-radius: .75rem; }

.card { border: 1px solid var(--border-soft); }
.card-img-top {
  object-fit: cover;
  height: 200px;
}
@media (min-width: 992px) {
  .card-img-top { height: 220px; }
}

.section__footer { text-align: center; }

.section--events { background: var(--bg-soft); }
.section--events .card { background: #fff; }

.main-nav__link {
  position: relative;
  transition: color .2s ease;
}
.main-nav__link:hover,
.main-nav__link:focus {
  color: var(--brand-primary);
}
.main-nav__link.active {
  color: var(--brand-primary);
}
.main-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: transparent;
  transition: background .2s ease;
}
.main-nav__link:hover::after,
.main-nav__link:focus::after,
.main-nav__link.active::after {
  background: var(--brand-primary);
}

.social__link {
  font-size: 1.25rem;
  opacity: .8;
  transition: opacity .2s ease, transform .2s ease;
}
.social__link:hover,
.social__link:focus {
  opacity: 1;
  transform: translateY(-1px);
}