:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --border: #e6e8f0;
  --text: #1c2033;
  --text-2: #5d6480;
  --text-3: #9aa0b8;
  --primary: #6d5efc;
  --primary-soft: #eeecff;
  --primary-dark: #5a4be0;
  --green: #12a87a;
  --red: #e0483d;
  --orange: #f2994a;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 47, .04), 0 8px 24px rgba(20, 24, 47, .06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

.app { display: flex; height: 100vh; }

/* ---------- 侧边栏 ---------- */
.sidebar {
  width: 232px;
  flex: 0 0 232px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
}
.brand { display: flex; gap: 10px; align-items: center; padding: 0 6px 20px; }
.brand-logo {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, #7c6bff, #a78bfa);
  color: #fff; font-weight: 700; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
}
.brand-name { font-weight: 600; font-size: 14px; }
.brand-sub { font-size: 11px; color: var(--text-3); letter-spacing: .5px; }

.nav { display: flex; flex-direction: column; gap: 4px; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border: 0; border-radius: 10px;
  background: transparent; color: var(--text-2);
  font-size: 14px; cursor: pointer; text-align: left;
  font-family: inherit;
}
.nav-item:hover { background: #f3f4fa; color: var(--text); }
.nav-item.active { background: var(--primary-soft); color: var(--primary-dark); font-weight: 600; }
.nav-item .ico { font-size: 15px; }

.sidebar-foot { margin-top: auto; padding: 12px 8px 0; border-top: 1px solid var(--border); }
.status-row { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-2); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-3); }
.dot.ok { background: var(--green); }
.dot.warn { background: var(--orange); }

/* ---------- 主区 ---------- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; overflow: hidden; }
.tab-panel { display: none; flex: 1; min-height: 0; flex-direction: column; padding: 22px 26px; overflow: auto; }
.tab-panel.active { display: flex; }

.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.panel-head h1 { margin: 0; font-size: 20px; font-weight: 650; }
.panel-head .sub { margin: 5px 0 0; color: var(--text-2); font-size: 13px; }
.head-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  padding: 8px 14px; border-radius: 9px; border: 1px solid var(--border);
  background: #fff; color: var(--text); cursor: pointer; font-size: 13px;
  font-family: inherit; white-space: nowrap;
}
.btn:hover { border-color: #cfd3e4; background: #fafbff; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 500; }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn.ghost { background: #fff; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ---------- 问答 ---------- */
.chat-wrap { flex: 1; min-height: 0; display: flex; flex-direction: column; gap: 14px; }
.chat-list { flex: 1; min-height: 0; overflow: auto; padding-right: 4px; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-2); }
.empty-ico { font-size: 40px; }
.empty-title { font-size: 16px; font-weight: 600; color: var(--text); margin: 10px 0 6px; }
.empty-desc { font-size: 13px; }
.suggests { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.suggest-chip {
  padding: 7px 13px; border: 1px solid var(--border); border-radius: 20px;
  background: #fff; font-size: 13px; cursor: pointer; color: var(--text-2);
}
.suggest-chip:hover { border-color: var(--primary); color: var(--primary); }

.msg { display: flex; gap: 10px; margin-bottom: 18px; }
.msg.user { flex-direction: row-reverse; }
.avatar {
  width: 30px; height: 30px; border-radius: 8px; flex: 0 0 30px;
  display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.msg.user .avatar { background: var(--primary-soft); color: var(--primary-dark); }
.msg.bot .avatar { background: #eef7f3; color: var(--green); }
.bubble {
  max-width: 76%; padding: 11px 14px; border-radius: 12px;
  background: #fff; border: 1px solid var(--border); line-height: 1.65;
  white-space: pre-wrap; word-break: break-word;
}
.msg.user .bubble { background: var(--primary); border-color: var(--primary); color: #fff; }
.bubble .typing { color: var(--text-3); }
.sources { margin-top: 10px; padding-top: 9px; border-top: 1px dashed var(--border); font-size: 12px; color: var(--text-2); }
.sources b { font-weight: 600; color: var(--text); }
.src-tag {
  display: inline-block; margin: 4px 6px 0 0; padding: 3px 8px;
  background: #f4f5fb; border-radius: 6px; font-size: 12px; color: var(--text-2);
}

.composer { display: flex; gap: 10px; align-items: flex-end; }
.composer textarea {
  flex: 1; resize: none; padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--border); background: #fff; font-family: inherit;
  font-size: 14px; line-height: 1.6; max-height: 160px; outline: none; color: var(--text);
}
.composer textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(109, 94, 252, .12); }

/* ---------- 知识库 ---------- */
.kb-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; align-content: start; }
.kb-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 8px;
}
.kb-card h3 { margin: 0; font-size: 15px; font-weight: 600; }
.kb-meta { font-size: 12px; color: var(--text-3); }
.kb-excerpt { font-size: 13px; color: var(--text-2); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.kb-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: 11px; padding: 2px 8px; background: var(--primary-soft); color: var(--primary-dark); border-radius: 6px; }
.kb-actions { display: flex; gap: 8px; margin-top: 4px; }
.kb-actions .btn { padding: 5px 10px; font-size: 12px; }
.kb-empty { grid-column: 1 / -1; text-align: center; padding: 60px; color: var(--text-2); background: #fff; border: 1px dashed var(--border); border-radius: var(--radius); }

/* ---------- 卡片/表单 ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 16px; align-content: start; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; font-size: 15px; font-weight: 600; }
.field { margin-bottom: 14px; }
.field > label { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.copy, .ghost-btn {
  border: 0; background: var(--primary-soft); color: var(--primary-dark);
  font-size: 11px; padding: 2px 8px; border-radius: 5px; cursor: pointer; font-family: inherit;
}
.hint { font-size: 12px; color: var(--text-2); line-height: 1.6; margin: 6px 0 0; }
.hint code { background: #f4f5fb; padding: 1px 5px; border-radius: 4px; font-size: 11px; }
input, textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 9px;
  font-family: inherit; font-size: 13px; outline: none; background: #fff; color: var(--text);
}
input:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(109, 94, 252, .12); }
input[readonly] { background: #fafbff; color: var(--text-2); }
textarea { resize: vertical; line-height: 1.6; }
.row { display: flex; gap: 8px; }
.row input { flex: 1; }
.row-end { display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.switch { display: flex; align-items: center; gap: 7px; font-size: 13px; cursor: pointer; color: var(--text); }
.switch input { width: auto; }

.test-result, .sim-result {
  margin-top: 14px; padding: 12px 14px; border-radius: 10px;
  background: #f7f8fc; font-size: 13px; line-height: 1.6; white-space: pre-wrap;
}
.test-result.ok { background: #eefaf4; color: #0d7f5c; }
.test-result.err { background: #fdeeed; color: #b8322a; }
.sim-result { background: #f7f8fc; }
.sim-result .q { color: var(--text-3); font-size: 12px; margin-bottom: 6px; }
.tip { margin-top: 14px; padding: 12px 14px; background: #fffaf0; border-radius: 10px; font-size: 12px; color: #8a5a1a; line-height: 1.65; }

/* ---------- 腾讯文档 ---------- */
.auth-state {
  padding: 10px 14px; border-radius: 9px; background: #f7f8fc;
  font-size: 13px; color: var(--text-2); margin-bottom: 12px;
}
.auth-state.ok { background: #eefaf4; color: #0d7f5c; }
.tdoc-list { margin-top: 12px; display: flex; flex-direction: column; gap: 8px; }
.tdoc-empty { font-size: 13px; color: var(--text-3); padding: 10px 0; }
.tdoc-item {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 9px; background: #fafbff;
}
.tdoc-main { min-width: 0; }
.tdoc-title { font-size: 13px; font-weight: 500; }
.tdoc-url { font-size: 12px; color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tdoc-item .btn { padding: 4px 10px; font-size: 12px; }
.tdoc-pick { display: flex; align-items: center; gap: 10px; cursor: pointer; width: 100%; }
.tdoc-pick input { width: auto; flex: 0 0 auto; }
.tdoc-pick .tdoc-main { display: flex; flex-direction: column; min-width: 0; }
.split-line { height: 1px; background: var(--border); margin: 14px 0; }
.sync-state { margin-top: 12px; font-size: 13px; color: var(--text-2); line-height: 1.7; }
.sync-state .err { color: #b8322a; }

/* ---------- 弹窗 ---------- */
.modal { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; }
.modal-mask { position: absolute; inset: 0; background: rgba(20, 24, 47, .38); }
.modal-body {
  position: relative; background: #fff; border-radius: 16px; padding: 22px;
  width: min(620px, 92vw); max-height: 88vh; overflow: auto; box-shadow: 0 20px 60px rgba(20, 24, 47, .2);
}
.modal-body h2 { margin: 0 0 16px; font-size: 17px; font-weight: 650; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%);
  background: #1c2033; color: #fff; padding: 10px 18px; border-radius: 10px;
  font-size: 13px; z-index: 100; box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
}

@media (max-width: 860px) {
  .sidebar { width: 64px; flex-basis: 64px; padding: 16px 8px; }
  .brand-text, .nav-item span:not(.ico), .sidebar-foot { display: none; }
  .nav-item { justify-content: center; padding: 10px 0; }
  .tab-panel { padding: 16px; }
  .bubble { max-width: 88%; }
}