.base64-card { overflow: hidden; }
.base64-mode-row,
.base64-example-row,
.base64-actions,
.base64-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.base64-mode-row { padding: 18px 22px; border-bottom: 1px solid var(--gt-line); background: rgba(7, 17, 31, 0.28); }
.base64-mode-label { color: var(--gt-muted); font-size: 0.85rem; font-weight: 700; margin-right: 4px; }
.base64-mode-button { min-height: 40px; padding: 0 14px; border: 1px solid var(--gt-line-strong); border-radius: 10px; color: var(--gt-muted); background: #0b1b2e; font: inherit; font-size: 0.86rem; font-weight: 700; cursor: pointer; }
.base64-mode-button:hover,
.base64-mode-button:focus-visible,
.base64-mode-button[aria-pressed="true"] { color: var(--gt-text); border-color: var(--gt-accent); background: rgba(8, 145, 178, 0.16); }
.base64-mode-button:focus-visible { outline: 3px solid rgba(56, 189, 248, 0.28); outline-offset: 2px; }
.base64-example-row { padding: 14px 22px 0; }
.base64-example-label { color: var(--gt-subtle); font-size: 0.78rem; font-weight: 700; }
.base64-inputs { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1px; margin-top: 14px; background: var(--gt-line); }
.base64-panel { min-width: 0; padding: 22px; background: rgba(7, 17, 31, 0.38); }
.base64-panel-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.base64-panel-heading h3 { margin: 0; font-size: 1.05rem; }
.base64-panel-heading span { color: var(--gt-subtle); font-size: 0.78rem; }
.base64-textarea { display: block; width: 100%; min-height: 240px; resize: vertical; padding: 14px; border: 1px solid var(--gt-line-strong); border-radius: 12px; color: #dbeafe; background: #081522; font: 0.88rem/1.6 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; overflow-wrap: anywhere; }
.base64-textarea[readonly] { color: #cffafe; background: #071c2d; }
.base64-textarea:focus { outline: 3px solid rgba(56, 189, 248, 0.28); outline-offset: 2px; border-color: var(--gt-accent); }
.base64-meta { justify-content: space-between; min-height: 34px; padding-top: 8px; color: var(--gt-subtle); font-size: 0.75rem; }
.base64-status { min-height: 1.7em; margin: 0; padding: 12px 22px 0; color: var(--gt-muted); font-size: 0.86rem; }
.base64-status[data-tone="success"] { color: #86efac; }
.base64-status[data-tone="error"] { color: #fca5a5; }
.base64-status[data-tone="warning"] { color: #fde68a; }
.base64-actions { justify-content: flex-end; padding: 16px 22px 22px; }
.base64-note { margin: 0 22px 22px; padding: 12px 14px; border-left: 3px solid var(--gt-accent); color: var(--gt-muted); background: rgba(8, 145, 178, 0.08); font-size: 0.82rem; line-height: 1.55; }
@media (max-width: 760px) {
  .base64-inputs { grid-template-columns: 1fr; }
  .base64-panel + .base64-panel { border-top: 1px solid var(--gt-line); }
}
@media (max-width: 480px) {
  .base64-mode-row, .base64-panel, .base64-actions { padding-left: 16px; padding-right: 16px; }
  .base64-example-row { padding-left: 16px; padding-right: 16px; }
  .base64-status { padding-left: 16px; padding-right: 16px; }
  .base64-note { margin-left: 16px; margin-right: 16px; }
  .base64-mode-row { align-items: stretch; }
  .base64-mode-button { flex: 1 1 140px; }
  .base64-textarea { min-height: 190px; font-size: 0.82rem; }
  .base64-actions { justify-content: stretch; }
  .base64-actions .gt-button { flex: 1 1 120px; }
}