body { background: #f4f6f9; }
:root{
  --blue: #4e8ef7;
  --blue-dark: #2f6fe0;
  --soft: #e7f0ff;
  --card: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --muted: #6b7280;
  --shadow: 0 10px 30px rgba(17,24,39,.08);
}

/* wrapper */
.usg2-wrap {
  max-width: 980px;
  margin: 28px auto;
  padding: 0 16px;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
}
.usg2-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  box-shadow: var(--shadow);
}

/* title */
.usg2-title {
  font-size: 22px;
  font-weight: 800;
  margin: 0 0 14px;
  color: var(--text);
  text-align: left;
}

/* label + hint */
.usg2-label {
  display: block;
  font-weight: 700;
  color: #374151;
  margin-bottom: 8px;
}
.usg2-hint {
  font-weight: 600;
  color: var(--muted);
  font-size: 13px;
  margin-left: 6px;
}

/* text input areas */
.usg2-textarea {
  width: 100%;
  min-height: 100px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fbfdff;
  color: var(--text);
  box-sizing: border-box;
  font-size: 14px;
}
.usg2-output-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
}
.usg2-output {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fbfdff;
  font-size: 14px;
}

/* separator buttons */
.usg2-controls {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 10px;
  margin-bottom: 8px;
}
.usg2-sep-group {
  display: flex;
  gap: 8px;
}
.usg2-sep {
  padding: 10px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-weight: 700;
  transition: all 0.2s;
}
.usg2-sep-active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.usg2-sep:hover {
  background: var(--soft);
}

/* checkboxes */
.usg2-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: #374151;
}

/* buttons */
.usg2-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 14px;
}
.usg2-btn {
  padding: 14px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--soft);
  color: #08223f;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.2s;
}
.usg2-primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  flex: 1;
}
.usg2-primary:hover {
  background: var(--blue-dark);
}
.usg2-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.usg2-ghost {
  background: #f0f4ff;
  color: #19386f;
}
.usg2-side-btns {
  display: flex;
  gap: 8px;
}

/* copy button */
.usg2-copy {
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
}
.usg2-copy:hover {
  background: var(--soft);
}
.usg2-copy:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* tips text */
.usg2-meta {
  margin-top: 12px;
  color: var(--muted);
  font-size: 13px;
}

/* responsive design */
@media(max-width: 720px) {
  .usg2-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .usg2-side-btns {
    justify-content: space-between;
  }
}