.assistant-dialog {
  width: min(620px, calc(100vw - 24px));
  max-width: none;
  max-height: calc(100dvh - 24px);
  padding: 0;
  color: var(--ink);
  background: var(--surface-solid);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.assistant-dialog[open] { display: flex; flex-direction: column; height: min(780px, calc(100dvh - 24px)); }
.assistant-heading { display: flex; justify-content: space-between; gap: 12px; padding: 22px 24px 16px; border-bottom: 1px solid var(--line); }
.assistant-heading h2 { margin: 0 0 5px; font-size: 22px; }
.assistant-heading small, .assistant-notice, .assistant-progress { color: var(--muted); }
.assistant-heading > button { align-self: flex-start; }
.assistant-messages { flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 0 24px; }
.assistant-turn { padding: 20px 0; border-bottom: 1px solid var(--line); }
.assistant-speaker { color: var(--muted); font-size: 11px; font-weight: 650; margin: 0 0 8px; }
.assistant-text { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14px; line-height: 1.65; margin: 0 0 18px; }
.assistant-text:last-child { margin-bottom: 0; }
.assistant-progress { font-size: 13px; }
.assistant-welcome { padding: 24px 0; }
.assistant-welcome h3 { font-size: 19px; }
.assistant-welcome p { color: var(--muted); font-size: 14px; line-height: 1.6; }
.assistant-suggestions { display: grid; gap: 8px; margin-top: 20px; }
.assistant-suggestions button { text-align: left; padding: 12px; font: inherit; font-size: 13px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--paper); cursor: pointer; }
.assistant-compose { display: grid; gap: 10px; padding: 16px 24px 20px; border-top: 1px solid var(--line); }
.assistant-compose textarea { width: 100%; min-height: 66px; max-height: 150px; resize: vertical; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; font: inherit; font-size: 16px; }
.assistant-compose label { font-size: 12px; font-weight: 600; }
.assistant-notice { font-size: 11px; line-height: 1.5; margin: 0; }
.assistant-actions { display: flex; justify-content: space-between; gap: 8px; }
.assistant-error { color: var(--ink); font-size: 12px; margin: 0; }
.assistant-error:empty { display: none; }
@media(max-width: 600px) {
  .assistant-dialog { width: calc(100vw - 16px); }
  .assistant-heading { padding: 16px; }
  .assistant-messages { padding: 0 16px; }
  .assistant-compose { padding: 12px 16px max(12px, env(safe-area-inset-bottom)); }
}