.lead { color: var(--text-2); max-width: 62ch; line-height: 1.55; }

.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: 8px; overflow: hidden; margin: 16px 0; }
.seg button { border: 0; background: var(--surface); padding: 7px 16px; font-size: .88rem; cursor: pointer; color: var(--text); }
.seg button.on { background: var(--accent-bg); color: var(--accent-2); font-weight: 650; }

.b64-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.b64-cols textarea { min-height: 180px; font-family: var(--mono); font-size: .84rem; }
.b64-opts { margin: 12px 0; gap: 14px; }
.b64-msg { margin: 4px 0 0; font-size: .84rem; color: var(--text-2); }
.b64-msg.bad { color: var(--bad); font-weight: 600; }

.b64-file textarea, [data-decin] { min-height: 130px; font-family: var(--mono); font-size: .82rem; }
.b64-file { margin-top: 14px; display: grid; gap: 8px; }
.b64-hr { border: 0; border-top: 1px solid var(--line); margin: 22px 0; }

@media (max-width: 640px) { .b64-cols { grid-template-columns: 1fr; } }