:root {
  --bw-header-divider: var(--divider, var(--panel-border, hsla(215, 25%, 65%, 0.36)));
  --bw-header-text: var(--text, #0f172a);
  --bw-header-muted: var(--muted, #475569);
  --bw-header-nav-bg: rgba(255, 255, 255, 0.2);
  --bw-header-nav-bg-dark: rgba(2, 6, 23, 0.12);
  --bw-focus: rgba(59, 130, 246, 0.55);
}

.bw-site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 4px 2px;
}

.bw-header-wrap {
  width: min(1060px, 100%);
  margin: 0 auto 14px;
}

.bw-brand {
  display: grid;
  gap: 2px;
}

.bw-brand-title {
  margin: 0;
  font-size: 1.24rem;
  letter-spacing: -0.02em;
  color: var(--bw-header-text);
  font-weight: 700;
  text-decoration: none;
}

.bw-brand-title:hover {
  text-decoration: none;
}

.bw-brand-subtitle {
  margin: 0;
  color: var(--bw-header-muted);
  font-size: 0.95rem;
}

.bw-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.bw-nav-link {
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--bw-header-divider);
  background: var(--bw-header-nav-bg);
  color: var(--bw-header-text);
  font-weight: 600;
  transition: filter 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.bw-nav-link:hover {
  text-decoration: none;
  filter: brightness(1.04);
}

.bw-nav-link[aria-current="page"] {
  border-color: var(--pill-border, var(--bw-header-divider));
  background: var(--pill-bg, rgba(37, 99, 235, 0.1));
  color: var(--pill-text, var(--bw-header-text));
}

.bw-btn {
  appearance: none;
  border: 1px solid var(--bw-header-divider);
  padding: 11px 14px;
  border-radius: 12px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--bw-header-text);
  background: rgba(255, 255, 255, 0.25);
  transition: filter 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.bw-btn:hover {
  text-decoration: none;
  filter: brightness(1.05);
}

.bw-btn:focus-visible,
.bw-nav-link:focus-visible,
.bw-brand-title:focus-visible {
  outline: 2px solid var(--bw-focus);
  outline-offset: 2px;
}

.bw-btn--primary {
  border-color: var(--btn-border, rgba(255, 255, 255, 0.35));
  background: linear-gradient(135deg, var(--btn-start, #2563eb), var(--btn-end, #1d4ed8));
  color: #fff;
}

.bw-split-control {
  position: relative;
  display: inline-flex;
  align-items: stretch;
  width: min(100%, 420px);
  border-radius: 12px;
  filter: drop-shadow(0 12px 28px rgba(37, 99, 235, 0.18));
}

.bw-split-control .bw-btn {
  border: none;
}

.bw-split-control .bw-btn--primary {
  border-radius: 12px;
  min-width: 0;
  width: 100%;
  flex: 1 1 auto;
  padding: 12px 20px;
}

.bw-btn--split-toggle {
  width: 3rem;
  padding: 0;
  display: none;
  place-items: center;
  background: linear-gradient(135deg, var(--btn-end, #1d4ed8), var(--btn-start, #2563eb));
  border-left: 1px solid var(--btn-border, rgba(255, 255, 255, 0.35));
  border-radius: 0 12px 12px 0;
  color: #fff;
  font-size: 1.1rem;
}

.bw-split-control.has-menu .bw-btn--primary {
  border-radius: 12px 0 0 12px;
  width: auto;
}

.bw-split-control.has-menu .bw-btn--split-toggle {
  display: grid;
}

.bw-btn--split-toggle:focus-visible {
  outline-offset: 3px;
}

@media (prefers-color-scheme: dark) {
  .bw-nav-link {
    background: var(--bw-header-nav-bg-dark);
  }
}