:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --line: #e5e9ef;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #f5a623;
  --accent-2: #2563eb;
  --danger: #dc2626;
  --ok: #16a34a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(160deg, #fff8eb 0%, #f4f6f8 40%, #eef3ff 100%);
  min-height: 100vh;
}
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 12px; }
.error { color: var(--danger); min-height: 1.2em; }
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(380px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  display: grid;
  gap: 12px;
  box-shadow: 0 12px 40px rgba(31, 41, 55, 0.08);
}
.login-card h1 { margin: 0; font-size: 22px; }
label { display: grid; gap: 6px; font-size: 13px; }
input, textarea, select, button {
  font: inherit;
}
input, textarea, select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
}
button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--accent);
  color: #111;
  font-weight: 600;
  cursor: pointer;
}
button.mini {
  padding: 4px 10px;
  font-size: 12px;
  background: #fff;
  border: 1px solid var(--line);
}
button.linkish {
  background: transparent;
  color: var(--muted);
  text-align: left;
  padding: 8px 0;
}
.app {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}
.sidebar {
  background: rgba(255,255,255,0.9);
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.brand { display: grid; gap: 4px; }
.sidebar nav { display: grid; gap: 8px; }
.sidebar nav button {
  background: transparent;
  text-align: left;
  border: 1px solid transparent;
  color: var(--text);
}
.sidebar nav button.active {
  background: #fff7e8;
  border-color: #f0d39a;
}
main { padding: 16px; }
.tab header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-weight: 600;
}
.split {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 12px;
  height: calc(100vh - 48px);
}
.list-pane, .chat-pane {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.list-pane header, .chat-pane header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  margin: 0;
}
.scroll { overflow: auto; flex: 1; }
.conv-item, .card {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}
.conv-item:hover, .conv-item.active { background: #fff8eb; }
.conv-item .title { display: flex; justify-content: space-between; gap: 8px; }
.badge {
  display: inline-block;
  background: var(--danger);
  color: #fff;
  border-radius: 999px;
  padding: 0 6px;
  font-size: 11px;
}
.tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 999px;
  background: #eef2ff;
  color: #3730a3;
}
.tag.warn { background: #fff1f2; color: #be123c; }
.tag.ok { background: #ecfdf5; color: #047857; }
.messages { padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.bubble {
  max-width: 70%;
  padding: 10px 12px;
  border-radius: 12px;
  background: #f3f4f6;
  white-space: pre-wrap;
  word-break: break-word;
}
.bubble.out {
  align-self: flex-end;
  background: #fff1cc;
}
.bubble .meta { font-size: 11px; color: var(--muted); margin-top: 4px; }
.reply-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--line);
}
.cards { display: grid; gap: 12px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: default;
}
.card .actions { margin-top: 8px; display: flex; gap: 8px; }
dialog {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0;
  width: min(420px, 92vw);
}
dialog form { display: grid; gap: 10px; padding: 18px; }
dialog menu { display: flex; justify-content: flex-end; gap: 8px; padding: 0; margin: 0; }
.row { display: flex; align-items: center; gap: 8px; }
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; height: auto; }
  .sidebar { flex-direction: row; align-items: center; flex-wrap: wrap; }
}