:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #efede6;
  --text: #1c1d1f;
  --muted: #5d6066;
  --border: #dcd9cf;
  --accent: #1f5f4a;
  --accent-text: #ffffff;
  --notice-bg: #fff4d6;
  --notice-border: #e6c868;
  --root: #2f5d8a;
  --complaints: #a1452f;
  --navigator: #6a4c93;
  --bq: #2c7a5b;
  --user: #3b3d42;
  --code-bg: #f1efe8;
  --shadow: 0 1px 2px rgba(20, 20, 20, 0.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141517;
    --surface: #1c1e21;
    --surface-2: #24272b;
    --text: #e8e6e1;
    --muted: #a0a3a9;
    --border: #33373c;
    --accent: #6cc4a1;
    --accent-text: #0f1a15;
    --notice-bg: #2e2914;
    --notice-border: #75642a;
    --root: #7fb0e0;
    --complaints: #e79a85;
    --navigator: #b9a0e0;
    --bq: #78cfa9;
    --user: #c9cbd0;
    --code-bg: #24272b;
    --shadow: none;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #141517;
  --surface: #1c1e21;
  --surface-2: #24272b;
  --text: #e8e6e1;
  --muted: #a0a3a9;
  --border: #33373c;
  --accent: #6cc4a1;
  --accent-text: #0f1a15;
  --notice-bg: #2e2914;
  --notice-border: #75642a;
  --root: #7fb0e0;
  --complaints: #e79a85;
  --navigator: #b9a0e0;
  --bq: #78cfa9;
  --user: #c9cbd0;
  --code-bg: #24272b;
  --shadow: none;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 "IBM Plex Sans", system-ui, sans-serif;
  overflow-x: hidden;
}

code, pre, .mono { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: 0.86em; }

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

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }

.top { border-bottom: 1px solid var(--border); padding: 28px 0 20px; }
.eyebrow { margin: 0 0 4px; color: var(--muted); font-size: 13px; letter-spacing: 0.02em; }
h1 { margin: 0 0 12px; font-size: clamp(24px, 4vw, 32px); font-weight: 600; letter-spacing: -0.01em; }
.notice {
  margin: 0 0 10px;
  padding: 10px 12px;
  background: var(--notice-bg);
  border: 1px solid var(--notice-border);
  border-radius: 6px;
  max-width: 820px;
}
.links { margin: 0; font-size: 14px; color: var(--muted); }

.layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 28px; padding-top: 24px; padding-bottom: 32px; }

.label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 8px; font-weight: 500; }

.scenarios ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.scenarios button {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
.scenarios button:hover { background: var(--surface-2); }
.scenarios button[aria-current="true"] { background: var(--surface); border-color: var(--border); box-shadow: var(--shadow); font-weight: 500; }
.scenarios .n { color: var(--muted); font-variant-numeric: tabular-nums; margin-right: 6px; }

.stage { min-width: 0; }
.stage-head { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; flex-wrap: wrap; }
.stage-head h2 { margin: 0; font-size: 21px; font-weight: 600; }
.muted { color: var(--muted); }
#scenario-summary { margin: 4px 0 0; max-width: 620px; }
.meta { margin: 6px 0 0; font-size: 12px; color: var(--muted); }
.controls { display: flex; gap: 8px; flex-wrap: wrap; }
.controls button {
  font: inherit; font-size: 14px;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  min-height: 40px;
}
.controls button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 500; }
.controls button:disabled { opacity: 0.45; cursor: default; }
.progress { margin: 10px 0 14px; font-size: 13px; }

.lanes {
  display: flex; flex-wrap: wrap; gap: 6px 8px;
  position: sticky; top: 0; z-index: 2;
  background: var(--bg);
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
.lane-head { font-family: "IBM Plex Mono", monospace; font-size: 12px; padding: 3px 8px 3px 6px; border-radius: 4px; color: var(--text); background: var(--surface); border: 1px solid var(--border); display: inline-flex; align-items: center; gap: 6px; transition: border-color 0.2s; }
.lane-head::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--lane); }
.lane-head.active { border-color: var(--lane); }
[data-lane="root_agent"] { --lane: var(--root); }
[data-lane="complaints_handler"] { --lane: var(--complaints); }
[data-lane="navigator_agent"] { --lane: var(--navigator); }
[data-lane="bq_agent"] { --lane: var(--bq); }
[data-lane="user"] { --lane: var(--user); }

.timeline { list-style: none; margin: 0; padding: 0; }
.step { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 10px; animation: rise 0.25s ease-out; }
.step .card { margin-bottom: 10px; }
.rail { display: grid; grid-template-columns: repeat(4, 1fr); }
.rail span { position: relative; }
.rail span::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; margin-left: -1px; background: var(--border); }
.rail span.on::before { background: var(--lane); opacity: 0.35; }
.rail span.here::after { content: ""; position: absolute; left: 50%; top: 14px; width: 12px; height: 12px; margin-left: -6px; border-radius: 50%; background: var(--lane); box-shadow: 0 0 0 3px var(--bg); }
.step.user .rail span.here::after { display: none; }
.rail-head { display: grid; grid-template-columns: repeat(4, 1fr); width: 72px; font-family: "IBM Plex Mono", monospace; font-size: 10px; color: var(--muted); text-align: center; margin-bottom: 4px; }

@keyframes rise { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .step { animation: none; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--lane);
  border-radius: 6px;
  padding: 10px 12px;
  box-shadow: var(--shadow);
}
.card-head { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.who { font-family: "IBM Plex Mono", monospace; color: var(--lane); font-weight: 500; }
.t { font-variant-numeric: tabular-nums; white-space: nowrap; }

.user .card { background: var(--surface-2); border-left-color: var(--user); }
.user .body { font-size: 15px; }

.transfer .card { background: transparent; border: 1px dashed var(--lane); box-shadow: none; font-size: 14px; }

.body { overflow-wrap: anywhere; }
.body p { margin: 0.3em 0; }
.body > :first-child { margin-top: 0; }
.body > :last-child { margin-bottom: 0; }
.body table, .rows table { border-collapse: collapse; font-size: 13px; margin: 6px 0; display: block; overflow-x: auto; max-width: 100%; }
.body th, .body td, .rows th, .rows td { border: 1px solid var(--border); padding: 4px 8px; text-align: left; vertical-align: top; }
.body th, .rows th { background: var(--surface-2); font-weight: 500; }
.body code { background: var(--code-bg); padding: 1px 4px; border-radius: 3px; }

.tool { font-family: "IBM Plex Mono", monospace; font-size: 13px; }
.tool .kind { color: var(--muted); }
.arg-preview { margin: 6px 0 0; font-size: 14px; }
details { margin-top: 6px; }
summary { cursor: pointer; font-size: 13px; color: var(--muted); padding: 2px 0; }
summary:hover { color: var(--text); }
pre { background: var(--code-bg); border-radius: 4px; padding: 8px 10px; margin: 6px 0 0; overflow-x: auto; white-space: pre-wrap; word-break: break-word; font-size: 12.5px; line-height: 1.5; }
.result-tag { display: inline-block; font-size: 11px; padding: 1px 6px; border-radius: 3px; margin-left: 6px; background: var(--surface-2); color: var(--muted); }
.result-tag.err { color: var(--complaints); }
.pending { font-size: 13px; color: var(--muted); margin-top: 6px; }

.after { margin-top: 20px; padding: 14px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); }
.after h3 { margin: 0 0 6px; font-size: 15px; }
.after .rows { margin-bottom: 10px; }
.after p { margin: 4px 0; font-size: 14px; }

.about { border-top: 1px solid var(--border); padding-top: 20px; padding-bottom: 40px; color: var(--muted); max-width: 820px; margin-left: auto; margin-right: auto; }
.about h2 { font-size: 16px; color: var(--text); margin: 0 0 8px; }
.about p { margin: 0 0 10px; }

button:focus-visible, a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 820px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 16px; padding-top: 16px; }
  .scenarios ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .scenarios button { border-color: var(--border); background: var(--surface); padding: 8px; font-size: 14px; }
  .scenarios button[aria-current="true"] { border-color: var(--accent); outline: 1px solid var(--accent); }
  .lane-head { font-size: 11px; padding: 2px 6px 2px 5px; }
  .step { grid-template-columns: 48px minmax(0, 1fr); gap: 8px; }
  .rail-head { width: 48px; }
  .controls { width: 100%; }
  .controls button { flex: 1; }
  .stage-head h2 { font-size: 19px; }
}