:root {
  --app-header-bg: rgba(255, 255, 255, 0.9);
  --app-header-border: rgba(0, 0, 0, 0.08);
  --app-header-text: #1d1d1f;
  --app-header-button-bg: rgba(0, 0, 0, 0.05);
  --app-header-button-border: rgba(0, 0, 0, 0.08);
  --app-header-button-text: #1d1d1f;
}

.app-shell,
.app-shell-dark {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--app-header-text);
}

.app-shell-dark {
  --app-header-bg: rgba(255, 255, 255, 0.02);
  --app-header-border: rgba(255, 255, 255, 0.12);
  --app-header-text: rgba(255, 255, 255, 0.92);
  --app-header-button-bg: rgba(255, 255, 255, 0.08);
  --app-header-button-border: rgba(255, 255, 255, 0.2);
  --app-header-button-text: rgba(255, 255, 255, 0.92);
}

.app-header {
  width: 100%;
  box-sizing: border-box;
  background: var(--app-header-bg);
  border-bottom: 1px solid var(--app-header-border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  padding: 14px clamp(18px, 4vw, 32px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  z-index: 100;
}

.app-logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--app-header-text);
}

.app-logo a {
  color: inherit;
  text-decoration: none;
}

.header-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-left: auto;
}

.header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.header-btn {
  padding: 8px 18px;
  background: var(--app-header-button-bg);
  border: 1px solid var(--app-header-button-border);
  border-radius: 999px;
  color: var(--app-header-button-text);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.header-btn:hover {
  transform: translateY(-1px);
  border-color: var(--app-header-button-text);
  color: var(--app-header-button-text);
}

@media (max-width: 720px) {
  .header-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: flex-start;
    margin-left: 0;
  }
}
:root {