html {
  color-scheme: dark;
  background-color: var(--bg-color);
}

[data-theme="light"] {
  color-scheme: light;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--accent-pill);
  outline-offset: 3px;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.docs-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
}

.docs-topbar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-avatar {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--line-strong);
}

.theme-toggle-btn .sun-icon,
.theme-toggle-btn .moon-icon { display: none; }
[data-theme="dark"] .theme-toggle-btn .sun-icon { display: block; }
[data-theme="light"] .theme-toggle-btn .moon-icon { display: block; }

.diag-main {
  flex: 1;
  width: min(680px, 100%);
  margin: 0 auto;
  padding: 72px 24px 48px;
}

.diag-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.diag-title {
  font-size: clamp(1.7rem, 4vw, 2.15rem);
  font-weight: 560;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 14px;
}

.diag-desc {
  max-width: 38rem;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

.diag-desc code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--text-primary);
}

.facts {
  margin-top: 28px;
}

.facts div {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--card-border);
}

.facts dt {
  color: var(--text-muted);
  font-size: 13px;
}

.facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  word-break: break-all;
}

.console-val.cyan { color: var(--accent-cyan); }
.console-val.orange { color: var(--accent-orange); }
.console-val.green { color: var(--success); }
.diag-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 8px;
  font: inherit;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  border: 1px solid transparent;
  font-weight: 600;
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--card-border);
}

.btn-primary:hover { opacity: 0.9; }
.btn-secondary:hover {
  color: var(--text-primary);
  border-color: var(--line-strong);
}

.services-nav {
  margin-top: 56px;
}

.services-nav-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.service-list {
  list-style: none;
  margin-top: 8px;
}

.service-list a {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--card-border);
  color: inherit;
  text-decoration: none;
}

.service-list a:hover .service-name {
  color: var(--text-primary);
}

.service-host {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
}

.service-name {
  font-size: 14px;
  color: var(--text-secondary);
}

.diag-footer {
  width: min(680px, 100%);
  margin: 0 auto;
  padding: 20px 24px 28px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-muted);
  font-size: 12px;
}

.diag-footer-domain {
  font-family: var(--font-mono);
}

@media (max-width: 640px) {
  .docs-topbar { padding: 0 16px; }
  .diag-main { padding: 48px 16px 32px; }
  .facts div,
  .service-list a { grid-template-columns: 1fr; gap: 2px; }
  .diag-footer { width: 100%; padding-inline: 16px; flex-direction: column; }
}