:root {
  --bg: #0e1116;
  --panel: #161b22;
  --line: #232a34;
  --txt: #e6edf3;
  --dim: #8b949e;
  --accent: #2f81f7;
  --ok: #3fb950;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font: 15px/1.65 "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}
.wrap { max-width: 860px; margin: 0 auto; height: 100vh; display: flex; flex-direction: column; padding: 20px; gap: 14px; }

header { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 19px; margin: 0; font-weight: 600; letter-spacing: .5px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 12px var(--ok); }
.meta { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--dim); }
.meta label { color: var(--dim); }
select {
  background: var(--panel); color: var(--txt); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; font-size: 13px; min-width: 190px;
}
.status { font-size: 12px; }
.status.ok { color: var(--ok); }
.status.err { color: #f85149; }

.log { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; padding-right: 6px; }
.msg { padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); max-width: 92%; white-space: pre-wrap; word-break: break-word; }
.msg.user { align-self: flex-end; background: #1b3a5c; border-color: #2b5580; }
.msg.bot { align-self: flex-start; background: var(--panel); }
.msg.bot.err { border-color: #f85149; color: #ffb4ab; }
.msg .who { display: block; font-size: 11px; color: var(--dim); margin-bottom: 6px; letter-spacing: .5px; }
.msg .cursor { display: inline-block; width: 7px; height: 15px; background: var(--accent); animation: blink 1s steps(2) infinite; vertical-align: -2px; }
@keyframes blink { 50% { opacity: 0; } }

/* 思维链：折叠显示，不与正式答案混排 */
.think { display: block; margin-bottom: 8px; }
.think-body {
  display: none; font-size: 12.5px; color: var(--dim); font-style: italic;
  border-left: 2px solid var(--line); padding: 4px 0 4px 10px; white-space: pre-wrap;
}
.think-body.on { display: block; }

/* 正文节点：和「思考中…」提示分开，避免互相覆盖 */
.msg .out { white-space: pre-wrap; }

/* 等待提示：上游还在想第一个 token 时显示 */
.msg .waiting {
  display: inline-block; margin-right: 6px; font-size: 12.5px; color: var(--dim);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: .45; } 50% { opacity: 1; } }

.composer { display: flex; gap: 10px; align-items: flex-end; }
textarea {
  flex: 1; resize: none; background: var(--panel); color: var(--txt);
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px;
  font: inherit; min-height: 52px; max-height: 160px;
}
textarea:focus { outline: none; border-color: var(--accent); }
button {
  background: var(--accent); color: #fff; border: 0; border-radius: 12px;
  padding: 12px 22px; font: inherit; font-weight: 600; cursor: pointer;
}
button:disabled { opacity: .5; cursor: not-allowed; }
footer { font-size: 12px; color: var(--dim); text-align: center; }