* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #0f1420;
  color: #e6e9ef;
}

.container { max-width: 1100px; margin: 0 auto; padding: 24px; }

/* --- Top nav --- */
.topnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: #161d2e;
  border-bottom: 1px solid #232c42;
}
.topnav-brand { font-weight: 700; font-size: 18px; }
.topnav-links a {
  color: #aeb6c9;
  text-decoration: none;
  margin-left: 20px;
  font-size: 14px;
}
.topnav-links a:hover { color: #fff; }

/* --- Login page --- */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-box {
  background: #161d2e;
  padding: 36px;
  border-radius: 12px;
  width: 100%;
  max-width: 360px;
  border: 1px solid #232c42;
}
.login-box h1 { font-size: 20px; margin-bottom: 20px; text-align: center; }
.login-box label { display: block; margin: 12px 0 4px; font-size: 13px; color: #aeb6c9; }
.login-box input {
  width: 100%; padding: 10px 12px; border-radius: 8px;
  border: 1px solid #2b3452; background: #0f1420; color: #fff;
}
.login-box button {
  margin-top: 20px; width: 100%; padding: 11px;
  background: #4f7dfb; color: #fff; border: none; border-radius: 8px;
  font-weight: 600; cursor: pointer;
}
.login-box button:hover { background: #3d68e0; }

/* --- Alerts --- */
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #3a1a1f; color: #ff9aa5; border: 1px solid #5c2530; }
.alert-success { background: #143324; color: #7fe6ad; border: 1px solid #1f5c3d; }

/* --- Dashboard stats --- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin: 24px 0; }
.stat-card {
  background: #161d2e; border: 1px solid #232c42; border-radius: 12px;
  padding: 20px; text-align: center;
}
.stat-number { display: block; font-size: 30px; font-weight: 700; }
.stat-label { font-size: 13px; color: #aeb6c9; }
.stat-locked .stat-number { color: #ff9aa5; }
.stat-unlocked .stat-number { color: #7fe6ad; }

.btn {
  display: inline-block; margin-top: 10px; padding: 10px 18px;
  background: #4f7dfb; color: #fff; border-radius: 8px; text-decoration: none; font-size: 14px;
}

/* --- Add device box --- */
.add-device-box {
  background: #161d2e; border: 1px solid #232c42; border-radius: 12px;
  padding: 16px; margin-bottom: 20px;
}
.add-device-box summary { cursor: pointer; font-weight: 600; }
.grid-form {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px; margin-top: 16px;
}
.grid-form label { display: block; font-size: 12px; color: #aeb6c9; margin-bottom: 4px; }
.grid-form input {
  width: 100%; padding: 9px 10px; border-radius: 8px;
  border: 1px solid #2b3452; background: #0f1420; color: #fff;
}
.grid-form button {
  grid-column: 1 / -1; padding: 10px; background: #4f7dfb; color: #fff;
  border: none; border-radius: 8px; font-weight: 600; cursor: pointer;
}

/* --- Table --- */
.data-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.data-table th, .data-table td {
  padding: 10px 12px; text-align: left; font-size: 13px;
  border-bottom: 1px solid #232c42;
}
.data-table th { color: #aeb6c9; font-weight: 600; }

.badge { padding: 3px 10px; border-radius: 20px; font-size: 11px; font-weight: 700; }
.badge-locked { background: #3a1a1f; color: #ff9aa5; }
.badge-unlocked { background: #143324; color: #7fe6ad; }

.btn-small {
  padding: 6px 12px; border-radius: 6px; border: none;
  font-size: 12px; font-weight: 600; cursor: pointer; margin-right: 4px;
}
.btn-lock { background: #5c2530; color: #ff9aa5; }
.btn-unlock { background: #1f5c3d; color: #7fe6ad; }

.muted { color: #aeb6c9; }