:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --ink: #1f2328;
  --muted: #5f6670;
  --line: #dcdad4;
  --accent: #2f6f5e;
  --accent-ink: #ffffff;
  --owner: #e6f0ec;
  --warn: #9a3412;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 760px; margin: 0 auto; padding: 16px; min-height: 100vh; display: flex; flex-direction: column; }
section { display: flex; flex-direction: column; gap: 12px; flex: 1; }
section[hidden] { display: none; }
h1 { font-size: 1.3rem; margin: 0; }
h2 { font-size: 1rem; margin: 0 0 8px; }
.hint { color: var(--muted); margin: 0; }

#login form { display: flex; flex-direction: column; gap: 8px; max-width: 360px; }
input, textarea { font: inherit; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: inherit; }
textarea { resize: vertical; width: 100%; }
button { font: inherit; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: inherit; cursor: pointer; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
button:disabled { opacity: 0.6; cursor: default; }
.error { color: var(--warn); margin: 0; }

header { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.toolbar { display: flex; gap: 8px; }

#messages { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.message { max-width: 92%; padding: 10px 12px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.message.owner { align-self: flex-end; background: var(--owner); }
.message.agent { align-self: flex-start; }
.text { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }

.card { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.rows { display: grid; grid-template-columns: minmax(120px, 32%) 1fr; gap: 6px 12px; margin: 0; }
.rows dt { color: var(--muted); }
.rows dd { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.status-missing { color: var(--muted); font-style: italic; }
.source { color: var(--muted); font-size: 0.9em; }
.changes { width: 100%; border-collapse: collapse; }
.changes th, .changes td { text-align: left; padding: 6px; border-bottom: 1px solid var(--line); vertical-align: top; white-space: pre-wrap; overflow-wrap: anywhere; }
.changes .before { color: var(--muted); text-decoration: line-through; }
.actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
a { color: var(--accent); }

#composer { display: flex; gap: 8px; align-items: flex-end; position: sticky; bottom: 0; background: var(--bg); padding: 8px 0; }

@media (max-width: 520px) {
  .rows { grid-template-columns: 1fr; }
  .message { max-width: 100%; }
}