:root {
  --bg: #f7f7f5; --panel: #ffffff; --ink: #1c1c1a; --ink-2: #55554f; --ink-3: #8a8a83;
  --line: #e3e2dd; --accent: #2a62d6; --hover: #f0efea;
  --strong: #2e9e5b; --mixed: #d99a1e; --thin: #d9473f; --none: #a3a39c;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111214; --panel: #191a1d; --ink: #ececea; --ink-2: #b4b4ae; --ink-3: #85857f;
    --line: #2a2b2f; --accent: #7aa7ff; --hover: #222327;
    --strong: #3fb872; --mixed: #e8ad35; --thin: #ec5f57; --none: #6e6e69;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--ink); font: 15px/1.55 var(--font); }
a { color: var(--accent); }
button, input, select { font: inherit; color: inherit; }

header {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 14px 24px; border-bottom: 1px solid var(--line); background: var(--panel);
}
header h1 { margin: 0; font-size: 18px; font-weight: 650; letter-spacing: -0.01em; }
header p { margin: 2px 0 0; color: var(--ink-3); font-size: 13px; }
.controls { display: flex; align-items: center; gap: 10px; }
.controls input, .controls select {
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px;
}
.controls input { width: 300px; }
.quiet { background: none; border: none; color: var(--ink-3); cursor: pointer; text-decoration: none; font-size: 13px; }
.quiet:hover { color: var(--ink); }

main { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(360px, 1fr); height: calc(100% - 67px); }
#tree-wrap { position: relative; display: flex; flex-direction: column; min-height: 0; overflow-y: auto; }
.legend {
  display: flex; align-items: center; gap: 16px; padding: 10px 24px; color: var(--ink-2); font-size: 13px;
}
.legend .hint { color: var(--ink-3); margin-left: auto; }
.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }
.dot.strong { background: var(--strong); } .dot.mixed { background: var(--mixed); }
.dot.thin { background: var(--thin); } .dot.none { background: var(--none); }
.dot.ring { background: transparent; box-shadow: inset 0 0 0 2px var(--ink-3); }
#tree { flex: none; }
.legend { position: sticky; top: 0; z-index: 2; background: var(--bg); }

#detail {
  overflow-y: auto; background: var(--panel); border-left: 1px solid var(--line); padding: 22px 28px 60px;
}
.crumbs { display: flex; flex-wrap: wrap; gap: 4px; font-size: 13px; margin-bottom: 10px; }
.crumbs button { background: none; border: none; padding: 0; color: var(--ink-3); cursor: pointer; }
.crumbs button:hover { color: var(--accent); }
.crumbs span { color: var(--ink-3); }
#detail h2 { margin: 0 0 8px; font-size: 22px; line-height: 1.25; letter-spacing: -0.01em; }
.pill {
  display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: 12px; font-weight: 600;
  color: #fff; margin-right: 8px;
}
.pill.strong { background: var(--strong); } .pill.mixed { background: var(--mixed); }
.pill.thin { background: var(--thin); } .pill.none { background: var(--none); }
.why { color: var(--ink-3); font-size: 13px; }
.lede { margin: 16px 0 6px; font-size: 15.5px; }
.note { color: var(--ink-3); font-size: 12.5px; margin: 0 0 18px; }

.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); margin: 18px 0 14px; }
.tabs button {
  background: none; border: none; padding: 8px 12px; cursor: pointer; color: var(--ink-3);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs button.on { color: var(--ink); border-bottom-color: var(--accent); }
.pane h4 { margin: 18px 0 6px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-3); }
.pane ul { padding-left: 18px; margin: 6px 0; }
.pane li { margin: 4px 0; }
.q { font-style: italic; color: var(--ink-2); }
.kv { color: var(--ink-2); }
.kv b { color: var(--ink); font-weight: 600; }
.kids button {
  display: block; width: 100%; text-align: left; background: none; border: none; border-radius: 6px;
  padding: 6px 8px; margin: 0 -8px; cursor: pointer;
}
.kids button:hover { background: var(--hover); }
.muted { color: var(--ink-3); }
.check { margin: 8px 0; }
.md { font-size: 14.5px; }
.md h1, .md h2, .md h3 { font-size: 16px; margin: 20px 0 8px; }
.md table { border-collapse: collapse; font-size: 13px; }
.md td, .md th { border: 1px solid var(--line); padding: 4px 8px; }
details { margin: 10px 0; }
summary { cursor: pointer; color: var(--ink-2); }

body.login { display: grid; place-items: center; }
body.login form {
  display: flex; flex-direction: column; gap: 12px; width: min(340px, 90vw); padding: 32px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
}
body.login h1 { margin: 0 0 6px; font-size: 20px; }
body.login input { padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
body.login button { padding: 10px; border: none; border-radius: 8px; background: var(--accent); color: #fff; cursor: pointer; }
body.login .err { color: var(--thin); margin: 0; font-size: 14px; }

@media (max-width: 900px) {
  header { flex-direction: column; align-items: stretch; padding: 12px 16px; }
  .controls input { width: 100%; }
  main { grid-template-columns: 1fr; height: auto; }
  #tree { height: 70vh; }
  #detail { border-left: none; border-top: 1px solid var(--line); padding: 18px 16px 40px; }
  .legend { padding: 8px 16px; flex-wrap: wrap; }
  .legend .hint { display: none; }
}