* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, "Segoe UI", sans-serif;
  background: #f2f4f7;
  color: #1c2430;
}
.card {
  background: #fff;
  padding: 2.5rem 3rem;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(16, 32, 64, .12);
  text-align: center;
  max-width: 30rem;
}
h1 { margin-top: 0; font-size: 1.4rem; }
.doc { color: #55637a; }
button {
  font-size: 1.05rem;
  padding: .7rem 2.2rem;
  border: 0;
  border-radius: 6px;
  background: #2456d6;
  color: #fff;
  cursor: pointer;
}
button:hover { background: #1c46b4; }
button:disabled { background: #9db0d8; cursor: wait; }
.status { min-height: 1.2em; color: #55637a; font-size: .9rem; }

#editor-wrap {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: #fff;
}
#editor-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .45rem 1rem;
  background: #1c2430;
  color: #e8ecf3;
  font-size: .9rem;
}
#editor-bar #session-info { margin-left: auto; color: #9db0d8; }
#editor-bar button {
  font-size: .85rem;
  padding: .3rem 1rem;
  background: #405071;
}
#editor-bar button:hover { background: #2456d6; }
#editor-frame { flex: 1; border: 0; width: 100%; }