:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --ink: #1f2329;
  --muted: #8a9099;
  --line: #e6e8eb;
  --brand: #2f6bff;
  --brand-soft: #e9f0ff;
  --blocking: #e5484d;
  --assumable: #d98300;
  --ok: #2f9e44;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--ink); display: flex; flex-direction: column; height: 100vh;
}
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; }
.brand .sub { font-weight: 400; color: var(--muted); font-size: 12px; margin-left: 6px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { font-size: 12px; padding: 3px 10px; background: var(--brand-soft); color: var(--brand); border-radius: 999px; }

.stage { flex: 1; overflow-y: auto; padding: 16px; }
.log { display: flex; flex-direction: column; gap: 14px; max-width: 760px; margin: 0 auto; }

.msg { display: flex; gap: 10px; }
.msg .bubble { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; flex: 1; }
.msg.user { flex-direction: row-reverse; }
.msg.user .bubble { background: var(--brand); color: #fff; border: none; }

/* v2.5 回答层：自由文本正文（非模板卡片） */
.answer-body { font-size: 14px; line-height: 1.7; color: var(--ink); white-space: normal; }
.answer-body b { font-weight: 700; }
.insights { margin-top: 10px; padding: 10px 12px; background: #fafbfc; border: 1px dashed var(--line); border-radius: 10px; }
.insights-h { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.insights-i { font-size: 13px; color: var(--ink); line-height: 1.6; }

.classification { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.classification b { color: var(--ink); }

.suff { height: 6px; background: var(--line); border-radius: 4px; overflow: hidden; margin: 8px 0; }
.suff > i { display: block; height: 100%; background: var(--brand); }

.qcard { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-top: 10px; background: #fafbfc; }
.qcard .derived { font-size: 12px; color: var(--muted); margin: 0 0 6px; padding-left: 8px; border-left: 2px solid var(--line); line-height: 1.5; }
.qcard .q-q { font-weight: 600; color: var(--ink); font-size: 14px; }
.qcard .why { font-size: 12px; color: var(--muted); margin: 4px 0 8px; }
.qcard .q-extra { width: 100%; margin-top: 8px; padding: 7px 10px; border: 1px dashed var(--line); border-radius: 8px; font: inherit; font-size: 13px; background: #fff; }
.qcard .q-extra:focus { outline: none; border-color: var(--brand); }
.badge { font-size: 11px; padding: 1px 8px; border-radius: 999px; }

/* 理解确认卡片 */
.confirm-card { border: 1.5px solid var(--brand); border-radius: 12px; padding: 14px 16px; margin-top: 10px; background: var(--brand-soft); }
.confirm-title { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.confirm-b { font-size: 16px; font-weight: 700; color: var(--ink); line-height: 1.5; }
.confirm-sub { font-size: 12px; color: var(--muted); margin-top: 4px; }
.confirm-needs { font-size: 12px; color: var(--brand); margin-top: 8px; }

/* Hero 区（首屏可见、告诉用户这是干什么的） */
.hero {
  max-width: 760px; margin: 24px auto 16px; padding: 22px 22px 18px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
}
.hero h1 { font-size: 24px; margin: 0 0 8px; color: var(--ink); }
.hero .lede { font-size: 15px; color: var(--ink); margin: 0 0 14px; line-height: 1.6; }
.hero .examples { font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.hero .examples-label { margin-right: 4px; }
.hero .example {
  background: var(--brand-soft); color: var(--brand);
  padding: 4px 10px; border-radius: 999px; cursor: pointer;
  border: none; font: inherit;
}
.hero .example:hover { filter: brightness(.96); }

/* 错误显示（连接/JSON 解析失败时给用户看的） */
.err { background: #fff3f3; border: 1px solid #ffd6d6; color: #b32424; padding: 10px 12px; border-radius: 10px; font-size: 13px; }
.badge.blocking { background: #fdecec; color: var(--blocking); }
.badge.assumable { background: #fdf3e3; color: var(--assumable); }
.options { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.opt { font-size: 13px; padding: 6px 12px; border: 1px solid var(--line); background: #fff; border-radius: 8px; cursor: pointer; }
.opt.sel { border-color: var(--brand); background: var(--brand-soft); color: var(--brand); }
.skip { font-size: 12px; color: var(--muted); text-decoration: underline; cursor: pointer; margin-left: auto; }

.roadmap { list-style: none; padding: 0; margin: 8px 0 0; counter-reset: step; }
.roadmap li { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-top: 8px; }
.roadmap .step-no { font-weight: 700; color: var(--brand); }
.roadmap .meta { font-size: 12px; color: var(--muted); margin-top: 4px; }
.roadmap .owner { font-size: 11px; padding: 1px 8px; border-radius: 999px; background: var(--brand-soft); color: var(--brand); margin-left: 6px; }
.roadmap .owner.expert { background: #f3ecff; color: #7b4dff; }
.copy-handoff { font-size: 12px; margin-top: 6px; color: var(--brand); cursor: pointer; text-decoration: underline; }

.hidden { display: none !important; }
.plan-actions { max-width: 760px; margin: 14px auto 0; display: flex; flex-wrap: wrap; gap: 10px; }
.feedback { max-width: 760px; margin: 14px auto 0; display: flex; gap: 10px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; }
.stars span { font-size: 22px; color: var(--line); cursor: pointer; }
.stars span.on { color: #f5b301; }

.composer { display: flex; flex-direction: column; gap: 10px; padding: 12px 16px; background: var(--card); border-top: 1px solid var(--line); }
.composer textarea { flex: 1; resize: none; border: 1px solid var(--line); border-radius: 10px; padding: 10px; font: inherit; }
.loading { display: flex; align-items: center; gap: 10px; padding: 2px 2px 2px; color: var(--brand); font-size: 13px; }
.loading .spinner { width: 16px; height: 16px; border: 2px solid var(--brand-soft); border-top-color: var(--brand); border-radius: 50%; animation: spin .8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.composer .row { display: flex; gap: 10px; align-items: flex-end; }
.composer .row textarea { flex: 1; }
button { font: inherit; cursor: pointer; border: none; border-radius: 10px; padding: 10px 18px; }
button.primary { background: var(--brand); color: #fff; }
button.primary:disabled { opacity: .55; cursor: not-allowed; }
button.ghost { background: #fff; color: var(--muted); border: 1px solid var(--line); }