#nav-placeholder {
  min-height: 76px;
  position: sticky;
  top: 0;
  z-index: 3000;
  contain: layout paint;
}

#footer-placeholder {
  min-height: 400px;
  contain: layout;
}

nav, header {
  position: sticky;
  top: 0;
  z-index: 3000;
}

.site-header {
  background:
    linear-gradient(135deg, rgba(20, 32, 82, 0.96), rgba(5, 8, 22, 0.96) 58%, rgba(25, 9, 22, 0.96)),
    var(--color-surface);
  border-bottom: 1px solid rgba(255, 255, 255, 0.11);
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(14px);
}

.header-nav {
  width: min(100% - 32px, var(--container));
  min-height: 76px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  text-decoration: none;
}

.brand-logo img {
  display: block;
  width: 184px;
  height: auto;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.48));
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  margin-left: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
  white-space: nowrap;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  filter: brightness(1.06);
}

.btn:focus-visible,
.burger-btn:focus-visible,
.brand-logo:focus-visible {
  outline: 3px solid rgba(255, 204, 77, 0.95);
  outline-offset: 4px;
}

.btn-bonus {
  color: var(--color-btn-text);
  background: linear-gradient(135deg, #ffe073, var(--color-primary));
  box-shadow: 0 12px 26px rgba(255, 204, 77, 0.25);
}

.btn-register {
  color: #ffffff;
  background: linear-gradient(135deg, #ff5f78, var(--color-primary-2));
  box-shadow: 0 12px 26px rgba(236, 63, 91, 0.28);
}

.burger-btn {
  display: none;
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--color-text);
  cursor: pointer;
}

.burger-btn span {
  width: 22px;
  height: 2px;
  border-radius: 99px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.burger-btn.is-open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.burger-btn.is-open span:nth-child(2) {
  opacity: 0;
}

.burger-btn.is-open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-menu {
  display: none;
}

@media (max-width: 720px) {
  #nav-placeholder {
    min-height: 68px;
  }

  .header-nav {
    width: min(100% - 24px, var(--container));
    min-height: 68px;
    gap: 14px;
  }

  .brand-logo img {
    width: 148px;
  }

  .header-actions {
    display: none;
  }

  .burger-btn {
    display: inline-flex;
  }

  .mobile-menu {
    width: min(100% - 24px, var(--container));
    margin: 0 auto;
    padding: 0 0 14px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height 0.24s ease, opacity 0.2s ease, padding 0.2s ease;
  }

  .mobile-menu.is-open {
    max-height: 180px;
    opacity: 1;
    pointer-events: auto;
    padding-bottom: 16px;
  }

  .mobile-menu .btn {
    width: 100%;
    min-height: 48px;
  }
}

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-muted);
  padding: 48px 0;
}

.site-footer {
  background:
    radial-gradient(circle at 15% 0%, rgba(255, 204, 77, 0.13), transparent 34%),
    linear-gradient(180deg, var(--color-surface), #070916 78%);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--color-text-muted);
  padding: 52px 0 24px;
}

.footer-inner {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 1.2fr;
  gap: 36px;
  align-items: start;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  margin-bottom: 18px;
}

.footer-logo img {
  display: block;
  width: 176px;
  height: auto;
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.5));
}

.footer-title {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.25;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.footer-text {
  margin: 0;
  max-width: 440px;
  color: var(--color-text-muted);
}

.age-badge {
  width: 54px;
  height: 54px;
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(255, 204, 77, 0.9);
  border-radius: 50%;
  color: var(--color-primary);
  font-size: 1.05rem;
  font-weight: 900;
  background: rgba(255, 204, 77, 0.08);
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-links a {
  width: fit-content;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-primary);
  transform: translateX(3px);
}

.responsible-logos {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(118px, 1fr));
  gap: 12px;
}

.responsible-logos img {
  display: block;
  width: 100%;
  height: 68px;
  object-fit: contain;
  padding: 10px 12px;
  border-radius: 14px;
  background: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.24);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
}

.footer-bottom {
  width: min(100% - 32px, var(--container));
  margin: 34px auto 0;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.footer-bottom p {
  margin: 0;
}

@media (max-width: 860px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .responsible-logos {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .site-footer {
    padding-top: 42px;
  }

  .footer-inner,
  .footer-bottom {
    width: min(100% - 24px, var(--container));
  }

  .responsible-logos {
    grid-template-columns: 1fr;
  }

  .responsible-logos img {
    height: 72px;
  }
}