:root { --bg: #f0f2f5; --side: #fff; --text: #111; --accent: #008069; --border: #d1d7db; --msg-in: #fff; --msg-out: #dcf8c6; }
[data-theme="dark"] { --bg: #0b141a; --side: #111b21; --text: #e9edef; --accent: #00a884; --border: #222d34; --msg-in: #202c33; --msg-out: #005c4b; }
body { margin:0; height:100vh; font-family: sans-serif; background: var(--bg); color: var(--text); overflow: hidden; }
#app { display: flex; height: 100vh; }
#sidebar { width: 350px; background: var(--side); border-right: 1px solid var(--border); display: flex; flex-direction: column; }
#chat-area { flex: 1; display: flex; flex-direction: column; background: var(--bg); }
.header { padding: 15px; border-bottom: 1px solid var(--border); background: var(--side); display: flex; justify-content: space-between; align-items: center; height: 60px; box-sizing: border-box; }
.tabs { display: flex; border-bottom: 1px solid var(--border); }
.tab { flex: 1; padding: 15px; text-align: center; cursor: pointer; opacity: 0.6; }
.tab.active { opacity: 1; border-bottom: 3px solid var(--accent); color: var(--accent); }
.search-box { padding: 10px; }
.search-box input { width: 100%; padding: 10px; border-radius: 8px; border: none; background: var(--bg); color: var(--text); box-sizing: border-box; outline: none;}
#list-area { flex: 1; overflow-y: auto; }
.item { padding: 15px; border-bottom: 1px solid var(--border); cursor: pointer; }
.item.active { background: var(--border); }
.list-title { padding: 10px 15px; font-size: 11px; color: var(--accent); font-weight: bold; background: var(--bg); }
#messages { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 70%; padding: 10px; border-radius: 8px; box-shadow: 0 1px 2px rgba(0,0,0,0.1); }
.msg.in { align-self: flex-start; background: var(--msg-in); }
.msg.out { align-self: flex-end; background: var(--msg-out); }
.msg-name { font-size: 11px; color: var(--accent); font-weight: bold; margin-bottom: 4px;}
.input-row { padding: 15px; display: flex; gap: 10px; background: var(--side); align-items: center;}
.input-row input { flex: 1; padding: 12px; border: none; border-radius: 8px; background: var(--bg); color: var(--text); outline: none;}
.input-row button { background: none; border: none; color: var(--accent); font-size: 24px; cursor: pointer; }
.hidden { display: none !important; }
.centered { margin: auto; text-align: center; opacity: 0.5; }
.btn-s { float: right; background: var(--accent); color: #fff; border: none; padding: 4px 10px; border-radius: 4px; cursor: pointer;}