:root {
  --bg: #f6f7f9; --card: #ffffff; --border: #e3e6ea; --ink: #1c2430; --muted: #6b7280;
  --primary: #1f5eff; --primary-ink: #ffffff; --danger: #d5322f; --accent: #eef3ff;
  --radius: 10px; --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--ink); font: 15px/1.45 var(--font); }
.hidden { display: none !important; }
.error { color: var(--danger); font-size: 13px; margin: 6px 0 0; }
button, input, textarea { font: inherit; }
.btn { border: 1px solid var(--border); background: var(--card); color: var(--ink); border-radius: 8px; padding: 8px 14px; cursor: pointer; }
.btn:hover { background: #f1f3f6; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn.primary:hover { filter: brightness(0.95); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.ghost { background: transparent; }
.btn.icon { padding: 8px 10px; display: inline-flex; align-items: center; }
.btn.wide { width: 100%; }
.btn:disabled { opacity: 0.55; cursor: default; }

/* login */
.login { min-height: 100%; display: grid; place-items: center; padding: 24px; }
.login-card { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; display: grid; gap: 14px; }
.login-card h1 { margin: 0 0 6px; font-size: 22px; }
.login-card label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
.login-card input { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; }

/* desk */
.desk { height: 100%; display: grid; grid-template-rows: auto 1fr; }
.callbar { display: flex; align-items: center; gap: 14px; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--border); }
.callbar .brand { font-weight: 600; }
.callbar .spacer { flex: 1; }
.callbar .me { color: var(--muted); font-size: 13px; }
.call-status { font-size: 14px; color: var(--muted); }
.callbar[data-state="connecting"] .call-status, .callbar[data-state="active"] .call-status { color: var(--ink); font-weight: 600; }
.callbar[data-state="error"] .call-status { color: var(--danger); }
.columns { display: grid; grid-template-columns: 320px 1fr; min-height: 0; }
.left { border-right: 1px solid var(--border); background: var(--card); display: flex; flex-direction: column; min-height: 0; }
.dial { display: flex; gap: 6px; padding: 12px; border-bottom: 1px solid var(--border); }
.dial input { flex: 1; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; min-width: 0; }
.left .error { padding: 0 12px; }
.conversations { list-style: none; margin: 0; padding: 0; overflow-y: auto; }
.conversations li { padding: 12px 14px; border-bottom: 1px solid var(--border); cursor: pointer; display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; }
.conversations li:hover, .conversations li.selected { background: var(--accent); }
.conversations .num { font-weight: 600; }
.conversations .when { color: var(--muted); font-size: 12px; }
.conversations .preview { grid-column: 1 / -1; color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conversations li.unread .num::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); margin-right: 8px; vertical-align: middle; }
.right { display: flex; flex-direction: column; min-height: 0; }
.empty { margin: auto; color: var(--muted); }
.thread { display: flex; flex-direction: column; height: 100%; min-height: 0; }
.thread-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 18px; border-bottom: 1px solid var(--border); background: var(--card); }
.thread-head h2 { margin: 0; font-size: 18px; }
.items { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 65%; padding: 10px 12px; border-radius: 12px; background: var(--card); border: 1px solid var(--border); white-space: pre-wrap; word-break: break-word; }
.msg.outbound { align-self: flex-end; background: var(--accent); border-color: #d6e0ff; }
.msg .meta { display: block; margin-top: 4px; font-size: 11px; color: var(--muted); }
.call { align-self: center; font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 10px; padding: 6px 12px; border: 1px dashed var(--border); border-radius: 999px; background: var(--card); }
.call audio { height: 28px; }
.compose { display: flex; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--border); background: var(--card); }
.compose textarea { flex: 1; resize: none; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; }
.right .error { padding: 0 18px 10px; background: var(--card); }