:root {
  --bg: #0d1117; --panel: #161b22; --panel2: #1c2430; --border: #2a3441;
  --text: #e6edf3; --muted: #8b949e; --blue: #2563eb; --blue2: #1d4ed8;
  --green: #16a34a; --red: #dc2626; --amber: #d97706;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--text); }
a { color: #58a6ff; text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.error { color: #ff7b72; }
button { cursor: pointer; font: inherit; }

/* auth / centered cards */
.center { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 28px; width: 100%; max-width: 420px; }
.card h1 { margin: 0 0 6px; font-size: 22px; }
.auth label { display: block; margin: 14px 0; font-size: 13px; color: var(--muted); }
.auth input { display: block; width: 100%; margin-top: 6px; padding: 10px 12px;
  background: var(--panel2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); }
.card button[type=submit], .btn { display: inline-block; margin-top: 10px; padding: 10px 16px;
  background: var(--blue); color: #fff; border: 0; border-radius: 8px; text-align: center; }
.card button[type=submit]:hover, .btn:hover { background: var(--blue2); text-decoration: none; }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn.primary { background: var(--blue); }

/* topbar */
.topbar { display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; border-bottom: 1px solid var(--border); background: var(--panel); }
.brand { font-weight: 700; }
.topbar nav { display: flex; align-items: center; gap: 14px; font-size: 13px; }
.link { background: none; border: 0; color: #58a6ff; }

/* layout */
.layout { display: grid; grid-template-columns: 320px 1fr; height: calc(100vh - 53px); }
.sidebar { border-right: 1px solid var(--border); padding: 16px; overflow-y: auto; }
.row-between { display: flex; align-items: center; justify-content: space-between; }
.connect-box { margin: 16px 0; padding: 16px; background: var(--panel2); border-radius: 10px; text-align: center; }
.convlist { list-style: none; margin: 14px 0 0; padding: 0; }
.convitem { display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 10px 12px; border-radius: 8px; cursor: pointer; }
.convitem:hover, .convitem.active { background: var(--panel2); }
.cname { font-size: 14px; }

/* badges */
.badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; }
.badge.ok { background: rgba(22,163,74,.18); color: #4ade80; }
.badge.warn { background: rgba(220,38,38,.18); color: #f87171; }
.badge.human { background: rgba(37,99,235,.2); color: #60a5fa; }

/* thread */
.thread { display: flex; flex-direction: column; height: 100%; }
.empty { display: grid; place-items: center; height: 100%; }
.thread-head { display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--border); }
.mode-toggle button { background: var(--panel2); color: var(--muted); border: 1px solid var(--border);
  padding: 6px 12px; }
.mode-toggle button:first-child { border-radius: 8px 0 0 8px; }
.mode-toggle button:last-child { border-radius: 0 8px 8px 0; border-left: 0; }
.mode-toggle button.sel { background: var(--blue); color: #fff; border-color: var(--blue); }
.msgs { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: 70%; padding: 8px 12px; border-radius: 12px; position: relative; display: flex; align-items: center; gap: 8px; }
.msg .del { flex: 0 0 auto; background: rgba(255,255,255,.15); color: #fff; border: 0;
  border-radius: 50%; width: 20px; height: 20px; line-height: 1; font-size: 15px; cursor: pointer; opacity: .7; }
.msg .del:hover { opacity: 1; background: var(--red); }
.msg.customer .del { background: rgba(0,0,0,.15); color: var(--muted); }
.msg.customer { align-self: flex-start; background: var(--panel2); }
.msg.assistant, .msg.human { align-self: flex-end; background: var(--blue); color: #fff; }
.msg.human { background: #7c3aed; }
.msg.deleted { opacity: .5; font-size: 12px; }
.hint { padding: 10px 18px; font-size: 13px; }
.warn-hint { background: rgba(220,38,38,.12); color: #f8b4b4; border-bottom: 1px solid var(--border); }
.replybar { display: flex; gap: 8px; padding: 14px 18px; border-top: 1px solid var(--border); }
.replybar input { flex: 1; padding: 10px 12px; background: var(--panel2); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); }
.replybar button { padding: 10px 16px; color: #fff; border: 0; border-radius: 8px; white-space: nowrap; }
.replybar button.send { background: var(--blue); }
.replybar button.resume { background: var(--green); }

/* sidebar filter tabs */
.filters { display: flex; gap: 6px; margin: 12px 0 4px; }
.ftab { flex: 1; padding: 6px 8px; font-size: 12px; background: var(--panel2); color: var(--muted);
  border: 1px solid var(--border); border-radius: 8px; }
.ftab.sel { background: var(--blue); color: #fff; border-color: var(--blue); }

/* page picker */
.pagelist { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.pageitem { display: flex; align-items: center; gap: 10px; padding: 12px; background: var(--panel2);
  border: 1px solid var(--border); border-radius: 8px; }
.pagename { flex: 1; }

/* doc / prose */
.doc { padding: 0; }
.prose { max-width: 760px; margin: 0 auto; padding: 40px 24px 80px; line-height: 1.6; }
.prose h1 { font-size: 28px; }
.prose h2 { font-size: 18px; margin-top: 28px; }