/* cas-chat — dark command-deck look matching HELM's palette. */
:root {
  --bg:     #0b0f14;
  --bg2:    #111722;
  --panel:  #151d2a;
  --panel2: #1b2536;
  --line:   #263349;
  --fg:     #dbe6f5;
  --muted:  #7e90aa;
  --acc:    #5cc8ff;
  --ok:     #4ade80;
  --err:    #f87171;
  --radius: 12px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  overscroll-behavior: none; }
.hidden { display: none !important; }
button { font: inherit; color: inherit; cursor: pointer; }
input, textarea { font: inherit; }

/* ── auth ────────────────────────────────────────────────────────────────── */
.auth { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: radial-gradient(1200px 700px at 50% -10%, #16243a 0%, var(--bg) 60%); }
.auth-card { width: min(420px, 92vw); padding: 28px 26px; background: var(--panel);
  border: 1px solid var(--line); border-radius: var(--radius); }
.brand { font-size: 28px; letter-spacing: 0.18em; color: var(--acc); font-weight: 800; margin: 0; }
.tabs { display: flex; gap: 6px; margin: 16px 0; }
.tab { flex: 1; background: var(--bg2); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px; color: var(--muted); }
.tab.on { background: var(--panel2); color: var(--fg); border-color: var(--acc); }
form { display: flex; flex-direction: column; gap: 10px; }
input { background: var(--bg2); border: 1px solid var(--line); color: var(--fg);
  border-radius: 10px; padding: 12px 14px; outline: none; }
input:focus { border-color: var(--acc); }
.btn-primary { background: var(--acc); color: #06121e; border: 0; border-radius: 10px;
  padding: 12px; font-weight: 700; }
.btn-primary:hover { filter: brightness(1.1); }
.err { color: var(--err); min-height: 1.2em; margin: 6px 0 0; font-size: 13px; }

/* ── app shell ────────────────────────────────────────────────────────────── */
.app { display: grid; grid-template-columns: 280px 1fr; height: 100dvh; }
.sidebar { background: var(--panel); border-right: 1px solid var(--line); display: flex;
  flex-direction: column; overflow-y: auto; padding: 14px 12px env(safe-area-inset-bottom); }
.sb-header { display: flex; justify-content: space-between; align-items: center; }
.iconbtn { background: transparent; border: 0; color: var(--muted); font-size: 18px; padding: 4px 8px; }
.iconbtn:hover { color: var(--fg); }
.me { color: var(--muted); margin: 8px 0 18px; font-size: 13px; }
.sb-section h3 { color: var(--muted); font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.1em; margin: 14px 0 6px; display: flex; justify-content: space-between; align-items: center; }
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li { padding: 8px 10px; border-radius: 8px; cursor: pointer; display: flex; gap: 8px; align-items: center; }
.sidebar li:hover { background: var(--bg2); }
.sidebar li.on { background: var(--panel2); color: var(--acc); }
.sidebar li .pill { font-size: 11px; color: var(--muted); margin-left: auto; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); display: inline-block; }
.dot.online { background: var(--ok); box-shadow: 0 0 6px var(--ok); }

/* ── chat pane ────────────────────────────────────────────────────────────── */
.chat { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.chat-header { padding: 14px 18px; border-bottom: 1px solid var(--line); font-size: 17px;
  font-weight: 600; }
.messages { flex: 1; overflow-y: auto; padding: 16px 18px; display: flex; flex-direction: column; gap: 8px; }
.msg { background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 12px; max-width: 78%; }
.msg .who { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.msg .body { white-space: pre-wrap; word-break: break-word; }
.msg .ts   { font-size: 11px; color: var(--muted); margin-top: 4px; opacity: 0.7; }
.msg.mine  { align-self: flex-end; background: var(--panel2); border-color: var(--acc); }
.composer { display: flex; gap: 8px; padding: 12px 14px env(safe-area-inset-bottom);
  border-top: 1px solid var(--line); background: var(--panel); }
.composer textarea { flex: 1; resize: none; background: var(--bg2); border: 1px solid var(--line);
  color: var(--fg); border-radius: 10px; padding: 10px 14px; outline: none; max-height: 160px; }
.composer textarea:focus { border-color: var(--acc); }
.composer .btn-primary { padding: 0 18px; }

.typing { color: var(--muted); font-size: 12px; padding: 0 18px 6px; min-height: 1.2em; }

/* system message — centered, no bubble, calls out the "from the host" feel */
.msg.system { align-self: center; background: transparent; border: 1px dashed var(--acc);
  color: var(--acc); text-align: center; max-width: 90%; font-style: italic; }
.msg.system .who { color: var(--acc); }

/* admin pip on the user list */
li .admin-pip { color: var(--acc); font-weight: 700; font-size: 11px; margin-left: 4px; }

/* sidebar search */
.searchbox { width: 100%; background: var(--bg2); border: 1px solid var(--line);
  color: var(--fg); border-radius: 8px; padding: 6px 10px; margin: 4px 0 8px;
  font-size: 13px; outline: none; }
.searchbox:focus { border-color: var(--acc); }

/* system-message toggle (admin-only) */
.sys-toggle { display: flex; align-items: center; gap: 4px; padding: 0 8px;
  background: var(--bg2); border: 1px solid var(--line); border-radius: 8px;
  color: var(--muted); cursor: pointer; user-select: none; font-size: 12px; }
.sys-toggle input { accent-color: var(--acc); }
.sys-toggle:has(input:checked) { color: var(--acc); border-color: var(--acc); }

/* modal */
.modal-ov { position: fixed; inset: 0; background: rgba(4, 8, 14, 0.7); display: flex;
  align-items: center; justify-content: center; z-index: 50; }
.modal { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; width: min(420px, 92vw); }
.modal h3 { margin: 0 0 8px; color: var(--acc); }
.modal .muted { color: var(--muted); font-size: 13px; margin: 0 0 12px; }
.modal code { background: var(--bg2); padding: 1px 6px; border-radius: 4px; font-size: 12px; }
.modal input { width: 100%; margin: 6px 0; }
.modal-btns { display: flex; gap: 8px; justify-content: flex-end; margin-top: 12px; }
.btn-secondary { background: var(--bg2); color: var(--fg); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 16px; font-weight: 600; }
.btn-secondary:hover { border-color: var(--acc); }
.ok { color: var(--ok); min-height: 1.2em; margin: 6px 0 0; font-size: 13px; }

/* quota bar */
.quota-bar { display: flex; align-items: center; gap: 8px; padding: 4px 18px;
  border-top: 1px solid var(--line); background: var(--panel); font-size: 11px;
  color: var(--muted); }
.quota-bar .meter { flex: 1; height: 4px; background: var(--bg2); border-radius: 2px; overflow: hidden; }
.quota-bar .meter .fill { height: 100%; background: var(--acc); transition: width 0.4s; }
.quota-bar.warn .meter .fill { background: var(--warn); }
.quota-bar.full .meter .fill { background: var(--err); }

/* self-chat pinned entry */
li.self { background: var(--bg2); border: 1px dashed var(--line); }
li.self:hover { border-color: var(--acc); }
li.self .pill { color: var(--acc); }

/* attach button + chip */
.attach-btn { padding: 0 8px; font-size: 18px; cursor: pointer; }
.attach-btn:hover { color: var(--acc); }
.msg .attach { display: inline-flex; align-items: center; gap: 6px; margin-top: 6px;
  padding: 6px 10px; background: var(--bg2); border: 1px solid var(--line);
  border-radius: 8px; font-size: 13px; color: var(--acc); text-decoration: none; }
.msg .attach:hover { border-color: var(--acc); }
.msg .attach .sz { color: var(--muted); font-size: 11px; }

/* ── mobile ──────────────────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .app.show-sidebar .sidebar { display: flex; position: fixed; inset: 0; width: 80vw; z-index: 10; }
}