:root {
  --bg: #f7f7f8;
  --fg: #1a1a1a;
  --muted: #666;
  --card: #ffffff;
  --border: #ddd;
  --accent: #2563eb;
  --ok: #178a3b;
  --bad: #c0392b;
  --code-bg: #f0f0f2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #e8e8e8;
    --muted: #9a9a9a;
    --card: #1f2023;
    --border: #333;
    --accent: #6ea8fe;
    --ok: #3fbf68;
    --bad: #ff6b6b;
    --code-bg: #0f1012;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  flex-wrap: wrap;
  gap: 0.5rem;
}

header.topbar .brand {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
}

nav.main a {
  color: var(--fg);
  text-decoration: none;
  margin-right: 1rem;
  font-size: 0.95rem;
}

nav.main a:hover, nav.main a.guide-link {
  color: var(--accent);
}

nav.main a.guide-link {
  font-weight: 700;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.tile {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
}

.tile .label { color: var(--muted); font-size: 0.85rem; }
.tile .value { font-size: 1.1rem; font-weight: 600; }
.ok { color: var(--ok); }
.bad { color: var(--bad); }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

a { color: var(--accent); }

input[type=text], input[type=password], textarea, select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font-family: inherit;
  font-size: 0.95rem;
}

textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; min-height: 320px; }

button, .btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: white;
  cursor: pointer;
  font-size: 0.95rem;
  text-decoration: none;
}

button.secondary, .btn.secondary {
  background: transparent;
  color: var(--accent);
}

.field { margin-bottom: 0.85rem; }
.field label { display: block; margin-bottom: 0.25rem; font-size: 0.9rem; color: var(--muted); }

.muted { color: var(--muted); }

pre.code, code {
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.15rem 0.35rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

pre.code { padding: 0.75rem; display: block; overflow-x: auto; }

.tree-list a { text-decoration: none; }
.tree-list li { margin: 0.15rem 0; }

.flash {
  padding: 0.6rem 0.9rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}
.flash.error { background: rgba(192, 57, 43, 0.15); color: var(--bad); }
.flash.success { background: rgba(23, 138, 59, 0.15); color: var(--ok); }

@media (max-width: 640px) {
  main { padding: 0.75rem; }
  nav.main a { margin-right: 0.6rem; font-size: 0.85rem; }
}