:root {
  --bg-main: #dcdfe5;
  --panel-1: #e7eaef;
  --panel-2: #f3f5f8;
  --panel-3: #f8f9fb;
  --line: #d9dee6;
  --text: #1e2430;
  --muted: #8b95a7;
  --green: #22c55e;
  --blue: #3b82f6;
  --orange: #f59e0b;
  --gray: #94a3b8;
  --send: #07c160;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "LXGW WenKai Screen", "Microsoft YaHei", sans-serif;
  background: var(--bg-main);
  color: var(--text);
}

.app-shell {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-columns: 70px 280px 1fr;
}

.rail {
  background: var(--panel-1);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0 10px;
}

.avatar-wrap { width: 100%; display: flex; justify-content: center; }
.avatar-lg {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid rgba(0, 0, 0, 0.08);
}
.icon-btn {
  width: 36px;
  height: 34px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: #4b5563;
  cursor: pointer;
}
.icon-btn:hover { background: rgba(0, 0, 0, 0.06); }

.sessions {
  background: var(--panel-2);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}
.search-wrap { padding: 16px 12px 8px; }
#searchInput {
  width: 100%;
  height: 32px;
  border: 1px solid #d7dce4;
  border-radius: 8px;
  background: #eef1f5;
  padding: 0 10px;
}

.contact-list { flex: 1; overflow: auto; padding: 2px 6px 8px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 8px;
  border-radius: 8px;
  cursor: pointer;
}
.contact-item:hover { background: rgba(0,0,0,0.03); }
.contact-item.active { background: rgba(164, 173, 184, 0.14); }
.avatar-sm {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  object-fit: cover;
}
.name-wrap { display: flex; flex-direction: column; }
.name-line { font-size: 15px; display: flex; align-items: center; gap: 6px; }
.meta-line { font-size: 12px; color: var(--muted); }
.dot { width: 8px; height: 8px; border-radius: 999px; display: inline-block; }
.dot.green { background: var(--green); }
.dot.blue { background: var(--blue); }
.dot.orange { background: var(--orange); }
.dot.gray { background: var(--gray); }

.chat { background: var(--panel-3); display: flex; flex-direction: column; }
.chat-header {
  height: 70px;
  border-bottom: 1px solid #dde2e9;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px 0 22px;
}
.chat-title { font-size: 30px; font-weight: 700; }
.dots-btn {
  border: none;
  background: transparent;
  font-size: 22px;
  color: #111827;
  cursor: pointer;
}

.messages {
  flex: 1;
  overflow: auto;
  padding: 12px 14px 14px;
  border-bottom: 1px solid #dfe4eb;
}
.msg-row { margin-bottom: 8px; }
.msg-meta {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 3px;
}
.msg-content { display: flex; gap: 8px; align-items: flex-start; }
.msg-content.out { justify-content: flex-end; }
.msg-content.in { justify-content: flex-start; }
.bubble {
  max-width: min(66%, 760px);
  border-radius: 12px;
  padding: 8px 10px;
  line-height: 1.58;
  white-space: pre-wrap;
  word-break: break-word;
}
.bubble.in { background: #fff; border: 1px solid #e2e8f0; }
.bubble.out { background: #dff6e7; border: 1px solid #b7e7c8; }

.composer { padding: 8px 12px 12px; }
.tool-row { height: 34px; display: flex; align-items: center; }
.tool-btn {
  width: 38px;
  height: 34px;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: 20px;
}
.tool-btn:hover { background: rgba(0,0,0,0.07); }
.input-row { display: flex; gap: 8px; align-items: flex-end; }
#inputBox {
  flex: 1;
  min-height: 76px;
  border: none;
  background: transparent;
  resize: none;
  outline: none;
  font: inherit;
}
.send-btn {
  width: 82px;
  height: 34px;
  border: none;
  border-radius: 6px;
  background: var(--send);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.settings-dialog {
  border: 1px solid #d8dde5;
  border-radius: 12px;
  width: 420px;
  padding: 14px;
}
.settings-dialog label { display: block; font-size: 14px; margin: 10px 0; }
.settings-dialog input,
.settings-dialog textarea {
  margin-top: 6px;
  width: 100%;
  border: 1px solid #d7dce4;
  border-radius: 8px;
  padding: 8px;
  font: inherit;
}
.settings-dialog .hint { color: #6b7280; font-size: 12px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
.dialog-actions button { min-width: 74px; height: 32px; border-radius: 8px; border: 1px solid #cfd6df; }
.dialog-actions button.primary { border: none; background: #2563eb; color: #fff; }