.main {
  grid-template-columns: minmax(0, 1fr) 380px;
}

.intro-panel {
  margin-bottom: 15px;
}

.intro-text {
  font-size: 13px;
  line-height: 1.8;
  color: #4b5563;
}

.panel .result-body {
  padding: 15px;
}

.form-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: #333;
}

.form-group textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  line-height: 1.6;
  color: #222;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
  resize: vertical;
  outline: none;
  box-sizing: border-box;
}

.form-group textarea:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.field-hint {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: #999;
}

.calc-btn {
  width: 100%;
  margin-top: 4px;
}

.privacy-chip {
  font-size: 12px;
  color: #16a34a;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}

.result-card {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 12px;
}

.result-card-label {
  font-size: 12px;
  font-weight: 600;
  color: #6b7280;
  margin-bottom: 6px;
}

#hmacOutput {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.7;
  color: #065f46;
  word-break: break-all;
}

.result-card-meta {
  margin-top: 6px;
  font-size: 11px;
  color: #9ca3af;
}

.result-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

.copyTip {
  display: none;
  font-size: 12px;
  color: #16a34a;
}

.main .extra-panel {
  grid-column: 1 / -1;
  margin-top: 0;
}

.seo-article {
  font-size: 13px;
  line-height: 1.9;
  color: #4b5563;
}

.seo-article h2 {
  margin: 16px 0 8px;
  font-size: 15px;
  color: #333;
}

.seo-article h2:first-child {
  margin-top: 0;
}

.seo-article h3 {
  margin: 12px 0 6px;
  font-size: 14px;
  color: #374151;
}

.seo-article p {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.9;
  color: #4b5563;
}

.seo-article ul,
.seo-article ol {
  margin: 0 0 12px;
  padding-left: 20px;
}

.seo-article li {
  margin-bottom: 6px;
}

.seo-article b {
  color: #333;
}

.seo-article code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  color: #4338ca;
  background: #f3f4f6;
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  padding: 1px 5px;
  word-break: break-all;
}

.seo-code-block {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 12px;
  margin: 8px 0 12px;
  overflow-x: auto;
}

.seo-code-block code {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  color: #374151;
  word-break: break-all;
}

.seo-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.seo-links a {
  font-size: 12px;
  color: #4338ca;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 999px;
  padding: 4px 10px;
  text-decoration: none;
  transition: background 0.2s;
}

.seo-links a:hover {
  background: #e0e7ff;
}

@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .intro-text {
    font-size: 12px;
  }

  .result-actions {
    flex-wrap: wrap;
  }
}