* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: #f4f6fb;
  color: #111827;
}
.auth-gate {
  max-width: 420px;
  margin: 10vh auto;
  padding: 2rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,.08);
  text-align: center;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: #1d4ed8;
  color: #fff;
}
.topbar nav { display: flex; gap: .75rem; align-items: center; }
.topbar button, .topbar a {
  background: transparent;
  border: 1px solid rgba(255,255,255,.4);
  color: #fff;
  padding: .35rem .7rem;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  font-size: .9rem;
}
.topbar button.active { background: rgba(255,255,255,.2); }
main { padding: 1.5rem; max-width: 1100px; margin: 0 auto; }
.data-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; }
.data-table th, .data-table td { padding: .75rem 1rem; border-bottom: 1px solid #e5e7eb; text-align: left; }
.card {
  background: #fff;
  padding: 1rem;
  border-radius: 10px;
  margin: 1rem 0;
  display: grid;
  gap: .75rem;
}
label { display: grid; gap: .35rem; font-size: .9rem; }
input, textarea, select, button {
  font: inherit;
  padding: .55rem .7rem;
  border-radius: 8px;
  border: 1px solid #d1d5db;
}
button[type="submit"], #login-btn, #new-worker-btn {
  background: #2563eb;
  color: #fff;
  border: none;
  cursor: pointer;
}
.row { display: flex; gap: .75rem; align-items: center; }
.messages { display: grid; gap: .5rem; margin: 1rem 0; }
.msg { background: #fff; padding: .75rem; border-radius: 10px; }
.msg-bot { border-left: 4px solid #2563eb; }
.msg-client { border-left: 4px solid #10b981; }
.msg-who { font-size: .75rem; color: #6b7280; text-transform: uppercase; }