body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  color: #222;
}

.container {
  width: min(1000px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: #1d4ed8;
  color: white;
  padding: 16px 0;
  margin-bottom: 24px;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.gap {
  gap: 24px;
}

.brand, .nav a, .nav .link-button {
  color: white;
  text-decoration: none;
  font-weight: bold;
  background: transparent;
  border: none;
  cursor: pointer;
}

.card {
  background: white;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,.05);
}

.narrow {
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

.button {
  display: inline-block;
  border: none;
  background: #1d4ed8;
  color: white;
  padding: 12px 16px;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  margin-top: 10px;
  margin-right: 10px;
}

.option {
  display: block;
  width: 100%;
  text-align: left;
}

.big-button {
  width: 100%;
  font-size: 28px;
  padding: 24px;
}

.big-label {
  font-size: 28px;
  font-weight: bold;
}

label {
  display: block;
  margin-top: 12px;
  margin-bottom: 6px;
}

input,
select,
textarea {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
}

.notice, .success, .error {
  padding: 12px;
  border-radius: 8px;
  margin-top: 12px;
}

.notice { background: #eef2ff; }
.success { background: #ecfdf5; }
.error { background: #fef2f2; }

.qr {
  width: 220px;
  height: 220px;
  border: 1px solid #ddd;
}

.screen-box {
  flex: 1;
  min-height: 260px;
  padding: 20px;
  background: #0f172a;
  color: white;
  border-radius: 12px;
}

.log {
  background: #0f172a;
  color: #e2e8f0;
  padding: 12px;
  border-radius: 8px;
  min-height: 120px;
  font-family: monospace;
}

.button-link {
  border: none;
  background: none;
  color: #b91c1c;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
  margin-left: 8px;
}