:root {
  --accent: #4F46E5;
  --accent-dark: #4338CA;
  --bg: #f1f5f9;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --green: #059669;
  --amber: #d97706;
  --red: #dc2626;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
body { background: var(--bg); color: var(--text); height: 100vh; overflow: hidden; }
.hidden { display: none !important; }

/* login */
#login { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #4F46E5, #7C3AED); }
.login-box { background: #fff; padding: 32px; border-radius: 16px; width: 320px; box-shadow: 0 20px 50px rgba(0,0,0,.3); text-align: center; }
.login-box h1 { color: var(--accent); font-size: 1.6rem; }
.login-box p { color: var(--muted); margin: 6px 0 20px; font-size: .9rem; }
.login-box input { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 12px; font-size: .95rem; }
.login-box button { width: 100%; padding: 12px; background: var(--accent); color: #fff; border: none; border-radius: 10px; font-size: 1rem; cursor: pointer; font-weight: 600; }
.login-box button:hover { background: var(--accent-dark); }
.error { color: var(--red); margin-top: 10px; font-size: .85rem; }

/* layout */
.topbar { display: flex; align-items: center; gap: 12px; background: var(--card); border-bottom: 1px solid var(--border); padding: 12px 20px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--accent); }
.brand-sub { color: var(--muted); font-weight: 400; }
.conn { margin-left: auto; font-size: .8rem; padding: 4px 10px; border-radius: 999px; }
.conn.online { background: #dcfce7; color: var(--green); }
.conn.offline { background: #fee2e2; color: var(--red); }
.ghost { background: none; border: 1px solid var(--border); color: var(--muted); padding: 6px 14px; border-radius: 8px; cursor: pointer; }

.layout { display: flex; height: calc(100vh - 57px); }

.sidebar { width: 340px; background: var(--card); border-right: 1px solid var(--border); display: flex; flex-direction: column; min-width: 280px; }
.tabs { display: flex; border-bottom: 1px solid var(--border); }
.tab { flex: 1; padding: 12px 6px; background: none; border: none; border-bottom: 3px solid transparent; cursor: pointer; font-size: .82rem; color: var(--muted); font-weight: 600; }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-panel { flex: 1; overflow-y: auto; display: flex; flex-direction: column; }
.filters { display: flex; gap: 8px; padding: 10px 12px; }
.chip { border: 1px solid var(--border); background: #fff; padding: 5px 12px; border-radius: 999px; cursor: pointer; font-size: .8rem; color: var(--muted); }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.conversation-list { list-style: none; }
.conversation-list li { padding: 12px 14px; border-bottom: 1px solid var(--border); cursor: pointer; display: flex; flex-direction: column; gap: 4px; }
.conversation-list li:hover { background: #f8fafc; }
.conversation-list li.active { background: #eef2ff; border-left: 3px solid var(--accent); }
.conv-top { display: flex; justify-content: space-between; align-items: center; }
.conv-name { font-weight: 600; font-size: .92rem; }
.status-badge { font-size: .7rem; padding: 2px 8px; border-radius: 999px; font-weight: 700; text-transform: uppercase; }
.status-badge.bot { background: #e0e7ff; color: var(--accent); }
.status-badge.human { background: #fef3c7; color: var(--amber); }
.status-badge.closed { background: #e2e8f0; color: var(--muted); }
.conv-meta { font-size: .78rem; color: var(--muted); }
.conv-external { font-size: .75rem; color: #94a3b8; }

.simple-list { list-style: none; padding: 10px; }
.simple-list li { border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; font-size: .82rem; }
.simple-list li b { display: block; font-size: .88rem; }
.simple-list .date { color: var(--muted); font-size: .75rem; }

.hint { padding: 12px; color: var(--muted); font-size: .82rem; }
.ingest-result { padding: 12px; font-size: .78rem; color: var(--muted); }
.primary { background: var(--accent); color: #fff; border: none; padding: 10px 16px; border-radius: 10px; cursor: pointer; font-weight: 600; margin: 0 12px; }
.primary:hover { background: var(--accent-dark); }

/* thread */
.thread { flex: 1; display: flex; flex-direction: column; background: var(--bg); }
.empty-state { flex: 1; display: flex; align-items: center; justify-content: center; color: var(--muted); }
.thread-header { background: var(--card); border-bottom: 1px solid var(--border); padding: 14px 20px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.thread-header .name { font-weight: 700; }
.thread-header .meta { font-size: .8rem; color: var(--muted); }
.thread-actions { margin-left: auto; display: flex; gap: 8px; }
.thread-actions button { background: none; border: 1px solid var(--border); padding: 6px 12px; border-radius: 8px; cursor: pointer; font-size: .8rem; color: var(--muted); }
.thread-actions button.takeover { border-color: var(--accent); color: var(--accent); }
.thread-actions button.return { border-color: var(--green); color: var(--green); }

.messages { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 70%; padding: 10px 14px; border-radius: 14px; font-size: .9rem; line-height: 1.5; white-space: pre-wrap; word-wrap: break-word; }
.msg.user { align-self: flex-end; background: var(--accent); color: #fff; border-bottom-right-radius: 4px; }
.msg.assistant { align-self: flex-start; background: #fff; border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg.human { align-self: flex-start; background: #eef2ff; border-bottom-left-radius: 4px; }
.msg.system { align-self: center; background: #fef3c7; color: #92400e; font-size: .78rem; }
.msg .role-label { display: block; font-size: .7rem; color: var(--muted); margin-bottom: 2px; font-weight: 700; text-transform: uppercase; }

.reply-bar { display: flex; gap: 10px; padding: 14px 20px; background: var(--card); border-top: 1px solid var(--border); }
.reply-bar textarea { flex: 1; resize: none; border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; font-size: .9rem; }
.reply-bar .primary { margin: 0; }