/* Base64 Encode/Decode. Needs /assets/css/modern-tool-cards.css (tokens + .cat-code accent). */
.b64, .b64 *, .b64 *::before, .b64 *::after { box-sizing: border-box; }
.b64 { display: grid; gap: 1rem; }

.b64-panel { background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 20px; box-shadow: var(--tc-shadow); overflow: hidden; display: grid; }

.b64-panel__head { display: flex; align-items: center; flex-wrap: wrap; gap: .6rem; padding: .9rem 1.25rem; background: var(--tc-surface); border-bottom: 1px solid var(--tc-border); }
.b64-panel__head h3 { margin: 0; font-size: .8rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--tc-muted); }
.b64-panel__head > i { color: var(--accent); font-size: 1.1rem; }

.b64-body { display: grid; gap: .8rem; padding: 1.25rem; }

.b64-layout { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: start; }
@media (max-width: 760px) { .b64-layout { grid-template-columns: 1fr; } }

.b64-side { display: grid; gap: .4rem; }
.b64-side__head { display: flex; align-items: center; justify-content: space-between; font-size: .8rem; font-weight: 700; color: var(--tc-muted); }
.b64-area {
  width: 100%; padding: .8rem .9rem; font-family: ui-monospace, "SF Mono", Consolas, monospace; font-size: .88rem; resize: vertical;
  color: var(--tc-text); background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 12px;
}
.b64-area:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

.b64-swap {
  justify-self: center; align-self: center; margin-top: 1.6rem;
  width: 2.6rem; height: 2.6rem; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--tc-border); border-radius: 50%; background: var(--tc-bg); color: var(--tc-muted); cursor: pointer;
}
.b64-swap:hover { color: var(--accent); border-color: var(--accent); }
.b64-swap:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (max-width: 760px) { .b64-swap { margin: 0 auto; transform: rotate(90deg); } }

.b64-copy {
  display: inline-flex; align-items: center; gap: .3rem; font-size: .76rem; font-weight: 700;
  color: var(--tc-text); background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 8px;
  padding: .25rem .6rem; cursor: pointer;
}
.b64-copy:hover { border-color: var(--accent); color: var(--accent); }
.b64-copy:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.b64-clear {
  display: inline-flex; align-items: center; gap: .3rem; font-size: .76rem; font-weight: 700;
  color: var(--tc-text); background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 8px;
  padding: .25rem .6rem; cursor: pointer;
}
.b64-clear:hover { border-color: var(--accent); color: var(--accent); }
.b64-clear:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.b64-error { margin: 0; font-size: .85rem; font-weight: 600; color: #dc2626; }

.b64-foot { margin: 0; display: flex; gap: .5rem; font-size: .84rem; color: var(--tc-muted); }
.b64-foot i { color: var(--accent); margin-top: .15rem; }