/* ── 双面板布局 ── */
.b64-dual-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.b64-panel {
    display: flex;
    flex-direction: column;
}

.b64-textarea {
    width: 100%;
    flex: 1;
    min-height: 180px;
    padding: 1rem;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-family: 'Fira Code', monospace;
    font-size: 0.88rem;
    line-height: 1.6;
    resize: vertical;
    color: #333;
    background: #fafafa;
    box-sizing: border-box;
}

.b64-textarea:focus {
    outline: none;
    border-color: #2563eb;
    background: #fff;
}

/* ── 选项 ── */
.b64-options {
    margin-bottom: 1rem;
}

.option-checkbox {
    font-size: 0.88rem;
    color: #555;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.option-checkbox input[type="checkbox"] {
    accent-color: #2563eb;
}

/* ── 信息提示 ── */
.b64-info {
    margin-top: 1rem;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    font-size: 0.88rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.b64-info.success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #065f46;
}

.b64-info.error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.b64-info-icon {
    flex-shrink: 0;
}

/* ── Mobile ── */
@media (max-width: 640px) {
    .b64-dual-panel {
        grid-template-columns: 1fr;
    }

    .b64-textarea {
        min-height: 120px;
        font-size: 0.82rem;
    }
}