:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #1c1e21;
  --muted: #65676b;
  --line: #dddfe2;
  --accent: #0a7c42;
  --in: #ffffff;
  --out: #d9fdd3;
  --error: #b3261e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.bar nav { display: flex; gap: 16px; align-items: center; }
.bar form { margin: 0; }
.brand { font-weight: 600; text-decoration: none; }

main { max-width: 760px; margin: 0 auto; padding: 16px; }

.card {
  max-width: 380px;
  margin: 40px auto;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.card.wide { max-width: none; margin: 0; }
.card h1 { margin: 0 0 12px; font-size: 20px; }
.card h2 { margin: 20px 0 8px; font-size: 16px; }
.card label { display: block; margin: 12px 0; color: var(--muted); font-size: 14px; }

input, textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  color: var(--text);
  background: var(--panel);
}

button {
  padding: 10px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  cursor: pointer;
}
button.link { padding: 0; background: none; color: var(--accent); text-decoration: underline; }

.error { color: var(--error); }
.ok { color: var(--accent); }
code { overflow-wrap: anywhere; }
.empty, .notice { color: var(--muted); text-align: center; padding: 24px 0; }

.list { list-style: none; margin: 0; padding: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
.list li + li { border-top: 1px solid var(--line); }
.list a {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 12px;
  padding: 12px 16px;
  color: inherit;
  text-decoration: none;
}
.who { font-weight: 600; }
.when { color: var(--muted); font-size: 13px; }
.preview { grid-column: 1 / -1; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge { margin-left: 6px; padding: 1px 8px; border-radius: 10px; background: var(--accent); color: #fff; font-size: 12px; }
.badge.human { background: #b35c00; }
select { width: 100%; padding: 10px; border: 1px solid var(--line); border-radius: 8px; font: inherit; background: var(--panel); color: var(--text); }

.thread-head { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; margin-bottom: 12px; }
.tag { padding: 1px 8px; border: 1px solid var(--line); border-radius: 10px; color: var(--muted); font-size: 12px; }

.messages {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: calc(100vh - 290px);
  min-height: 240px;
  overflow-y: auto;
  padding: 12px;
  background: #ece5dd;
  border-radius: 10px;
}
.msg {
  max-width: 80%;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--in);
  align-self: flex-start;
  overflow-wrap: anywhere;
}
.msg.out { background: var(--out); align-self: flex-end; }
.msg.failed { outline: 1px solid var(--error); }
.msg .body { white-space: pre-wrap; }
.msg .kind { color: var(--muted); }
.msg .meta, .msg .error { display: block; margin-top: 4px; font-size: 12px; }
.msg .meta { color: var(--muted); }

.msg .tools { margin-top: 6px; font-size: 12px; color: var(--muted); }
.msg .tools summary { cursor: pointer; }
.msg .tool { margin-top: 4px; overflow-wrap: anywhere; }
.msg .tool span { font-family: ui-monospace, monospace; font-size: 11px; }
.hint { color: var(--muted); font-size: 13px; }
form.inline { display: inline; margin: 0; }
button:disabled { opacity: 0.6; cursor: wait; }

.composer { display: flex; gap: 8px; margin-top: 12px; align-items: flex-end; }
.composer textarea { resize: vertical; }

dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; }

@media (max-width: 520px) {
  main { padding: 10px; }
  dl { grid-template-columns: 1fr; }
}