* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f7f7f8; color: #1f2328; display: flex; flex-direction: column; height: 100vh; }
header { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: #fff; border-bottom: 1px solid #e5e5e5; }
.logo { font-size: 18px; font-weight: 600; }
.controls { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
select, input, textarea, button { font: inherit; }
select, textarea, input[type="password"] { padding: 6px 8px; border: 1px solid #ccc; border-radius: 8px; background: #fff; }
button { padding: 7px 14px; border: 0; border-radius: 8px; background: #10a37f; color: #fff; cursor: pointer; }
button:disabled { opacity: .5; cursor: wait; }
#btn-clear, #btn-regen { background: #6b7280; }
#settings { background: #fff; border-bottom: 1px solid #e5e5e5; padding: 8px 16px; }
#settings .block { display: block; margin: 8px 0; }
#settings textarea { width: 100%; }
main { flex: 1; overflow-y: auto; padding: 16px; max-width: 860px; width: 100%; margin: 0 auto; }
.msg { display: flex; gap: 10px; margin: 14px 0; }
.msg .role { flex: 0 0 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: #e5e7eb; font-size: 13px; }
.msg.user .role { background: #dbeafe; }
.msg .bubble { background: #fff; border: 1px solid #e5e5e5; border-radius: 12px; padding: 4px 14px;
  max-width: 100%; overflow-x: auto; line-height: 1.6; }
.msg .bubble pre { background: #0d1117; color: #e6edf3; padding: 12px; border-radius: 8px; overflow-x: auto; }
.msg .bubble code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; }
footer { background: #fff; border-top: 1px solid #e5e5e5; padding: 12px 16px; }
#composer { display: flex; gap: 10px; max-width: 860px; margin: 0 auto; align-items: flex-end; }
#composer textarea { flex: 1; resize: vertical; }
.hint { text-align: center; color: #9ca3af; font-size: 12px; margin: 8px 0 0; }