.spn-wrapper {
  position: sticky;
  top: 0;
  z-index: 999;
  background: var(--spn-bg, #ffffff);
  border-bottom: 1px solid var(--spn-border, #dddddd);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

.spn-page-header {
  background: #000000;
  color: #ffffff;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .2s ease, opacity .2s ease;
}

.spn-title-visible .spn-page-header {
  max-height: 80px;
  opacity: 1;
}

.spn-page-header__inner {
  padding: 8px 16px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
}

.spn-nav {
  display: block;
  background: var(--spn-bg, #ffffff);
}

.spn-nav__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  overflow-x: auto;
  margin: 0;
  padding: 0 12px;
  list-style: none;
  scrollbar-width: none;
  scroll-behavior: smooth;
}

.spn-nav__list::-webkit-scrollbar { display: none; }

.spn-nav__link {
  display: inline-block;
  padding: 14px 16px;
  color: var(--spn-text, #222222);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.spn-nav__link:hover,
.spn-nav__link:focus {
  color: var(--spn-active-text, #000000);
  background: rgba(0, 0, 0, 0.03);
  outline: none;
}

.spn-nav__link.active {
  color: var(--spn-active-text, #000000);
  border-bottom-color: var(--spn-accent, #000000);
  font-weight: 600;
}

.spn-mobile-toggle {
  display: none;
  width: 100%;
  border: 0;
  background: var(--spn-mobile-bg, #000000);
  color: var(--spn-mobile-text, #ffffff);
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.spn-mobile-toggle__icon { margin-right: 8px; }

@media (max-width: 768px) {
  .spn-page-header__inner {
    font-size: 16px;
    padding: 10px 14px;
  }
  .spn-title-visible .spn-page-header { max-height: 72px; }
  .spn-mobile-toggle { display: block; }
  .spn-nav {
    display: block;
    max-height: 0;
    overflow: hidden;
    border-top: 1px solid transparent;
    transition: max-height .25s ease, border-color .25s ease;
  }
  .spn-nav.open {
    max-height: 80vh;
    overflow: auto;
    border-top-color: var(--spn-border, #dddddd);
  }
  .spn-nav__list {
    flex-direction: column;
    overflow: visible;
    padding: 0;
  }
  .spn-nav__link {
    display: block;
    padding: 14px 16px;
    border-bottom: 1px solid #eeeeee;
    border-left: 3px solid transparent;
  }
  .spn-nav__link.active {
    border-bottom-color: #eeeeee;
    border-left-color: var(--spn-accent, #000000);
  }
}