.main-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.main-card {
  width: 520px;
  max-width: 100%;
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 24px;
  background: #fff;
}

.main-form label {
  display: block;
  margin: 12px 0 8px;
  font-size: 14px;
}

.main-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

.main-row input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
}

.main-row button {
  padding: 10px 16px;
  border: 1px solid #333;
  border-radius: 8px;
  cursor: pointer;
  background: #fff;
}

.hint {
  margin-top: 10px;
  color: #666;
  font-size: 12px;
}

.guidelines {
  margin-top: 24px;
}

.guideline-block {
  margin-bottom: 20px;
}

.guideline-block h4 {
  margin-bottom: 6px;
}

.guideline-block ul {
  padding-left: 18px;
}

.guideline-image {
  width: 100%;
  max-width: 480px;
  display: block;
  margin: 8px 0 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.example-caption {
  font-size: 13px;
  color: #555;
  margin-top: 8px;
}

.hl-example {
  display: inline-block;
  width: 16px;
  height: 10px;
  margin-right: 6px;
  vertical-align: middle;
}

.hl-example.ref {
  background: #5c7cfa55;
  border-bottom: 2px solid #5c7cfa;
}

.hl-example.missing {
  background: #ff000033;
  border-bottom: 2px solid #ff0000;
}

.subtitle {
  color: #555;
  margin-bottom: 12px;
}

/* optional styling for guidelines.html contents */
.gdl h3 { margin: 0 0 10px; font-size: 16px; }
.gdl-sec { margin: 10px 0 14px; }
.gdl-sec h4 { margin: 0 0 6px; font-size: 14px; }
.gdl-sec p, .gdl-sec li { font-size: 13px; line-height: 1.45; color: #333; }
.gdl-sec ul { margin: 6px 0 0; padding-left: 18px; }

.gdl-chip {
  display: inline-block;
  width: 14px;
  height: 10px;
  margin-right: 6px;
  vertical-align: middle;
}
.gdl-chip.ref { background: #5c7cfa55; border-bottom: 2px solid #5c7cfa; }
.gdl-chip.miss { background: #ff000033; border-bottom: 2px solid #ff0000; }

.gdl-cap { margin: 8px 0 6px; color: #555; font-size: 12px; }
.gdl-img {
  width: 100%;
  max-width: 480px;
  border: 1px solid #ddd;
  border-radius: 8px;
  display: block;
}