:root {
  --admin-font: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --admin-radius: 6px;
  --admin-radius-sm: 4px;
  --admin-shadow: 0 1px 3px rgba(0, 40, 90, 0.12);
  --admin-shadow-lg: 0 8px 24px rgba(0, 40, 90, 0.12);
  --admin-topbar-height: 52px;
  --admin-topbar-pad-y: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

.admin-body {
  min-height: 100vh;
  font-family: var(--admin-font);
  color: var(--admin-text);
  background: var(--admin-bg);
  line-height: 1.5;
}

.admin-body-centered {
  display: grid;
  place-items: center;
}

.admin-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--admin-topbar-height);
  background: var(--admin-topbar-bg);
  border-bottom: 1px solid var(--admin-border);
  box-shadow: var(--admin-shadow);
}

.admin-topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  min-height: var(--admin-topbar-height);
  padding: var(--admin-topbar-pad-y) 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.admin-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--admin-text);
  white-space: nowrap;
}

.admin-brand-icon {
  border-radius: 4px;
}

.admin-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1 1 420px;
  flex-wrap: wrap;
  min-width: 0;
}

.admin-nav-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: var(--admin-radius-sm);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--admin-muted);
  border: 1px solid transparent;
}

.admin-nav-link:hover {
  color: var(--admin-text);
  background: var(--admin-elevated);
}

.admin-nav-link.is-active {
  color: var(--admin-accent);
  background: var(--admin-accent-soft);
  border-color: var(--admin-accent-border);
}

.admin-logout-form {
  display: inline-flex;
  margin: 0;
}

.admin-nav-button {
  background: none;
  border: 1px solid transparent;
  cursor: pointer;
  font: inherit;
}

.admin-theme-form {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.admin-topbar-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex-shrink: 0;
}

.admin-timezone-form select {
  max-width: 210px;
}

.admin-theme-label {
  font-size: 0.75rem;
  color: var(--admin-muted);
  font-weight: 600;
}

.admin-theme-form select {
  font: inherit;
  font-size: 0.82rem;
  padding: 5px 8px;
  border-radius: var(--admin-radius-sm);
  border: 1px solid var(--admin-border);
  background: var(--admin-surface);
  color: var(--admin-text);
}

.admin-main {
  padding: 20px 16px 40px;
}

.admin-main-guest {
  width: 100%;
}

.admin-wrap {
  max-width: 1200px;
  margin: 0 auto;
}

.admin-wrap-narrow {
  max-width: 460px;
}

.admin-page-header {
  margin-bottom: 16px;
}

.admin-page-header h1 {
  margin: 0 0 4px;
  font-size: 1.25rem;
}

.admin-page-header p {
  margin: 0;
  color: var(--admin-muted);
  font-size: 0.92rem;
}

@media (max-width: 760px) {
  .admin-topbar-inner {
    padding: 10px 12px;
  }
  .admin-topbar-controls {
    width: 100%;
    margin-left: 0;
    justify-content: flex-end;
    flex-wrap: wrap;
  }
  .admin-theme-form {
    width: auto;
    justify-content: flex-end;
  }
  .admin-timezone-form select {
    max-width: 160px;
  }
}